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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	May 08, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	RBB
Entity Registrant Name	RBB BANCORP
Entity Central Index Key	0001499422
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		20,073,991

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 250,079	$ 147,685
Cash and cash equivalents	250,079	147,685
Interest-earning deposits in other financial institutions	1,196	600
Securities:
Available for sale	58,537	73,762
Held to maturity (fair value of $9,599 and $9,940 at March 31, 2019 and December 31, 2018, respectively)	9,449	9,961
Mortgage loans held for sale	375,430	434,522
Loans held for investment:
Real estate	1,776,711	1,762,864
Commercial	351,359	387,474
Total loans	2,128,070	2,150,338
Unaccreted discount on acquired loans	(7,809)	(9,229)
Deferred loan costs (fees), net	152	906
Total loans, net of deferred loan fees	2,120,413	2,142,015
Allowance for loan losses	(18,236)	(17,577)
Net loans	2,102,177	2,124,438
Premises and equipment	17,342	17,307
Federal Home Loan Bank (FHLB) stock	8,899	9,707
Net deferred tax assets	4,389	4,642
Income tax receivable		656
Other real estate owned (OREO)	2,056	1,101
Cash surrender value of life insurance (BOLI)	33,769	33,578
Goodwill	58,383	58,383
Servicing assets	17,288	17,370
Core deposit intangibles	7,212	7,601
Accrued interest and other assets	31,912	32,689
Total assets	2,978,118	2,974,002
Deposits:
Noninterest-bearing demand	418,953	438,764
Savings, NOW and money market accounts	480,959	579,247
Time deposits under $250,000	549,287	532,395
Time deposits $250,000 and over	735,141	593,635
Total deposits	2,184,340	2,144,041
Reserve for unfunded commitments	639	688
Income tax payable	3,009
FHLB advances	275,000	319,500
Long-term debt, net of debt issuance costs	103,793	103,708
Subordinated debentures	9,548	9,506
Accrued interest and other liabilities	16,986	21,938
Total liabilities	2,593,315	2,599,381
Commitments and contingencies - Note 13
Shareholders' equity:
Preferred Stock - 100,000,000 shares authorized, no par value; none outstanding
Common Stock - 100,000,000 shares authorized, no par value; 20,073,991 shares issued and outstanding at March 31, 2019 and 20,000,022 shares at December 31, 2018	289,514	288,610
Additional paid-in capital	5,890	5,659
Retained earnings	89,991	81,618
Non-controlling interest	72	72
Accumulated other comprehensive loss, net	(664)	(1,338)
Total shareholders’ equity	384,803	374,621
Total liabilities and shareholders’ equity	$ 2,978,118	$ 2,974,002

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Securities held to maturity, fair value	$ 9,599	$ 9,940
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, par value
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, par value
Common stock, shares issued	20,073,991	20,000,022
Common stock, shares outstanding	20,073,991	20,000,022

CONSOLIDATED STATEMENTS OF INCOME - (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest and dividend income:
Interest and fees on loans	$ 35,839	$ 19,074
Interest on interest-earning deposits	468	187
Interest on investment securities	588	560
Dividend income on FHLB stock	198	119
Interest on federal funds sold and other	113	237
Total interest income	37,206	20,177
Interest expense:
Interest on savings deposits, now and money market accounts	1,294	702
Interest on time deposits	5,953	2,046
Interest on subordinated debentures and other	1,747	913
Interest on other borrowed funds	2,300	71
Total interest expense	11,294	3,732
Net interest income	25,912	16,445
Provision for credit losses	550	184
Net interest income after provision for credit losses	25,362	16,261
Noninterest income:
Service charges, fees and other	820	466
Gain on sale of loans	2,198	1,815
Loan servicing fees, net of amortization	840	(31)
Recoveries on loans acquired in business combinations	6	6
Unrealized gain on equity investments	147
Increase in cash surrender value of life insurance	191	199
Total noninterest income	4,202	2,455
Noninterest expense:
Salaries and employee benefits	9,118	4,951
Occupancy and equipment expenses	2,252	791
Data processing	1,009	473
Legal and professional	425	258
Office expenses	336	171
Marketing and business promotion	362	203
Insurance and regulatory assessments	298	210
Amortization of intangibles	388	81
OREO expenses	81	7
Merger expenses	71	40
Other expenses	985	1,104
Total noninterest expense	15,325	8,289
Income before income taxes	14,239	10,427
Income tax expense	3,859	1,580
Net income	$ 10,380	$ 8,847
Net income per share
Basic	$ 0.52	$ 0.55
Diluted	0.51	0.52
Cash dividends declared per common share	$ 0.10	$ 0.08

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 10,380	$ 8,847
Other comprehensive income (loss):
Unrealized gains (losses) on securities available for sale, Change in unrealized gains (losses)	958	(853)
Related income tax effect, Change in unrealized gains (losses)	(284)	256
Total other comprehensive income (loss)	674	(597)
Total comprehensive income	$ 11,054	$ 8,250

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Non-Controlling Interest	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2017	$ 265,176	$ 205,927	$ 8,426	$ 51,266		$ (443)
Beginning balance, shares at Dec. 31, 2017		15,908,893
Net income	8,847			8,847
Stock-based compensation	131		131
Cash dividend	(1,275)			(1,275)
Stock options exercised	3,540	$ 4,668	(1,128)
Stock options exercised, shares		380,035
Other comprehensive income, net of taxes	(597)					(597)
Ending balance at Mar. 31, 2018	275,822	$ 210,595	7,429	58,838		(1,040)
Ending balance, shares at Mar. 31, 2018		16,288,928
Beginning balance at Dec. 31, 2018	$ 374,621	$ 288,610	5,659	81,618	$ 72	(1,338)
Beginning balance, shares at Dec. 31, 2018	20,000,022	20,000,022
Net income	$ 10,380			10,380
Stock-based compensation	231		231
Cash dividend	(2,007)			(2,007)
Stock options exercised	904	$ 904
Stock options exercised, shares		73,969
Other comprehensive income, net of taxes	674					674
Ending balance at Mar. 31, 2019	$ 384,803	$ 289,514	$ 5,890	$ 89,991	$ 72	$ (664)
Ending balance, shares at Mar. 31, 2019	20,073,991	20,073,991

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities
Net income	$ 10,380	$ 8,847
Adjustments to reconcile net income to net cash from
Depreciation and amortization of premises, equipment and intangibles	870	295
Net accretion of securities, loans, deposits, and other	(964)	(88)
Unrealized (gain) on equity securities	(147)
Amortization of affordable housing tax credits	225
Provision for credit losses	550	184
Stock-based compensation	231	131
Deferred tax benefit	(31)
Gain on sale of loans	(2,198)	(1,815)
Increase in cash surrender value of life insurance	(191)	(198)
Loans originated and purchased for sale	(41,348)	(88,790)
Proceeds from loans sold	144,272	57,453
Other items	135	2,478
Net cash provided by (used in) operating activities	111,784	(21,503)
Investing activities
Increase in interest-earning deposits	(596)
Securities available for sale:
Purchases		(24,920)
Maturities, prepayments and calls	16,185	6,126
Securities held to maturity:
Maturities, prepayments and calls	500
Redemption of Federal Home Loan Bank stock	1,751
Purchase of Federal Home Loan Bank stock and other equity securities, net	(1,007)	(4,549)
Purchase of investment in qualified affordable housing projects		(2,500)
Net increase in loans	(20,438)	(37,377)
Purchases of premises and equipment	(484)	(277)
Net cash used in investing activities	(4,089)	(63,497)
Financing activities
Net (decrease) increase in demand deposits and savings accounts	(118,098)	18,586
Net increase in time deposits	158,400	17,636
Net increase in FHLB advances	(44,500)	(25,000)
Cash dividends paid	(2,007)	(1,275)
Exercise of stock options	904	3,540
Net cash (used in) provided by financing activities	(5,301)	13,487
Net increase (decrease) in cash and cash equivalents	102,394	(71,513)
Cash and cash equivalents at beginning of period	147,685	150,048
Cash and cash equivalents at end of period	250,079	78,535
Cash paid during the period:
Interest paid	2,350	2,873
Non-cash investing and financing activities:
Transfer from Loans to Other Real Estate Owned	955
Transfer of loans to held for sale	33,633	23,989
Net change in unrealized holding (loss) gain on securities available for sale	$ 674	$ (597)

Business Description

3 Months Ended

Mar. 31, 2019

Business Description [Abstract]

Business Description

NOTE 1 - BUSINESS DESCRIPTION

RBB Bancorp (“RBB”) is a financial holding company registered under the Bank Holding Company Act of 1956, as amended. RBB Bancorp’s principal business is to serve as the holding company for its wholly-owned banking subsidiaries, Royal Business Bank ("Bank") and RBB Asset Management Company ("RAM"), collectively referred to herein as "the Company". RAM was formed to hold and manage problem assets acquired in business combinations.

At March 31, 2019, the Company had total assets of $3.0 billion, gross loans, including HFI and HFS loans, of $2.1 billion, total deposits of $2.18 billion and total stockholders' equity of $384.8 million. On July 31, 2017, RBB completed its initial public offering (“IPO”) of 3,750,000 shares of its common stock at a price to the public of $23.00 per share. RBB’s common stock trades on the Nasdaq Global Select Market under the symbol “RBB”.

The Bank provides business banking services to the Chinese-American communities in Los Angeles County, Orange County, Ventura County and in Las Vegas and the New York City metropolitan area, including remote deposit, E-banking, mobile banking, commercial and investor real estate loans, business loans and lines of credit, Small Business Administration (“SBA”) 7A and 504 loans, mortgage loans, trade finance and a full range of depository accounts.

The Company operates full-service banking offices in Arcadia, Cerritos, Diamond Bar, Irvine, Los Angeles, Monterey Park, Oxnard, Rowland Heights, San Gabriel, Silver Lake, Torrance, West Los Angeles, Irvine and Westlake Village, California; Las Vegas, Nevada; and Manhattan, Brooklyn, Flushing, and Elmhurst, New York. The Company’s primary source of revenue is providing loans to customers, who are predominantly small and middle-market businesses and individuals.

The Company generates its revenue primarily from interest received on loans and leases and, to a lesser extent, from interest received on investment securities. The Company also derives income from noninterest sources, such as fees received in connection with various lending and deposit services, residential mortgage loan originations, loan servicing, gain on sales of loans and wealth management services. The Company’s principle expenses include interest expense on deposits and subordinated debentures, and operating expenses, such as salaries and employee benefits, occupancy and equipment, data processing, and income tax expense.

As part of the FAIC acquisition, the Company acquired FAIB Capital Corp. (FAICC) that was formed on January 29, 2014. FAICC is a real estate investment trust subsidiary of the Bank.

The Company has completed five acquisitions from July 8, 2011 through October 15, 2018, including the acquisition of First American International Corp. (“FAIC”) and its wholly-owned subsidiary, First American International Bank (“FAIB”). On October 15, 2018, FAIB operated three branches in Queens, three in Manhattan, and two in Brooklyn, New York with an operating center and loan production offices in Brooklyn and an administrative center in Manhattan. See Note 3 – Acquisition, for more information about the FAIC acquisition transactions. All of the Company’s acquisitions have been accounted for using the acquisition method of accounting and, accordingly, the operating results of the acquired entities have been included in the consolidated financial statements from their respective acquisition dates.

Basis of Presentation and Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

NOTE 2 - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited consolidated financial statements and notes thereto of the Company have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) for Form 10-Q and conform to practices within the banking industry and include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for interim financial reporting. The accompanying unaudited consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments), which are necessary for a fair presentation of financial results for the interim periods presented. The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results for the full year. These interim unaudited financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto as of and for the year ended December 31, 2018, included in our Annual Report filed on Form 10-K for the fiscal year ended December 31, 2018 (our “2018 Annual Report”).

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Summary of Significant Accounting Policies

The accompanying unaudited consolidated financial statements were compiled in accordance with the accounting policies set forth in Note 1 – Summary of Significant Policies in our Consolidated Financial Statements as of and for the year ended December 31, 2018, included in our 2018 Annual Report. The accompanying consolidated unaudited financial statements reflect all adjustments consisting of normal recurring adjustments that, in the opinion of management, are necessary to reflect a fair statement of our consolidated financial condition, results of operations, and cash flows. The results of operations for acquired companies are included from the dates of acquisition. Operating results for the three months ended March 31, 2019 are not necessarily indicative of the results that may be expected for the year ended December 31, 2019.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU" or “Update”) 2014-09, Revenue from Contracts with Customers (Topic 606). This Update requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. The following steps are applied in the updated guidance: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the entity satisfies a performance obligation. These amendments are effective for public business entities for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Our revenue is primarily comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income. Accordingly, the majority of the Company’s revenues will not be affected. In addition, the standard does not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s existing accounting for contracts within the scope of the standard. As an emerging growth company, the Company adopted ASU 2014-09 as of January 1, 2019, utilizing the modified prospective approach. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements, as substantially all of the Company’s revenues are excluded from the scope of the new standard. Since there was no net income impact upon adoption of this ASU, a cumulative effect adjustment to opening retained earnings was not deemed necessary. See Note 20 (Revenue from Contracts with Customers) for more information.

In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10). Changes made to the current measurement model primarily affect the accounting for equity securities and readily determinable fair values, where changes in fair value will impact earnings instead of other comprehensive income. The accounting for other financial instruments, such as loans, investments in debt securities, and financial liabilities is largely unchanged. Investments in Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank (“FRB”) stock issued to member financial institutions are not subject to this guidance. Instead, FHLB and FRB stock would continue to be accounted for at cost less impairment under ASC 942-325-35-3. The ASU’s impairment guidance on equity investments for which fair value is not readily determinable also does not apply to FHLB or FRB stock. This Update also changes the presentation and disclosure requirements for financial instruments including a requirement that public business entities use exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes. This Update is generally effective for public business entities in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years and one year later for nonpublic business entities. The Company adopted this ASU as of January 1, 2019 and it did not have a material impact on the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The most significant change for lessees is the requirement under the new guidance to recognize right-of-use assets and lease liabilities for all leases not considered short-term leases, which is generally defined as a lease term of less than 12 months. This change will result in lessees recognizing right-of-use assets and lease liabilities for most leases currently accounted for as operating leases under current lease accounting guidance. The amendments in this Update are effective for interim and annual periods beginning after December 15, 2019, for an emerging growth company. The Company has several lease agreements which are currently considered operating leases and are therefore not included on the Company’s Consolidated Balance Sheets. Under the new guidance the Company expects that some of the lease agreements will have to be recognized on the Consolidated Balance Sheets as a right-of-use asset with a corresponding lease liability. Based upon a preliminary evaluation the Company expects that the ASU will have an impact on the Company’s Consolidated Balance Sheets. The Company will continue to evaluate how extensive the impact will be under the ASU on the Company’s consolidated financial statements. The Company anticipates adopting this ASU 2016-02 beginning January 1, 2020.

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instrument (Topic 326). This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that aren't measured at fair value through net income. The standard will replace today's "incurred loss" approach with an "expected loss" model. The new model, referred to as the current expected credit loss ("CECL") model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held to maturity securities, loan commitments, and financial guarantees. For available for sale (“AFS”) debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. ASU 2016-13 also expands the disclosure requirements regarding an entity's assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, public business entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU 2016-13 is effective for interim and annual reporting periods for an emerging growth company beginning after December 15, 2020. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company has begun its evaluation of the impact of the implementation of ASU 2016-13. The implementation of the provisions of ASU 2016-13 will most likely impact the Company’s consolidated financial statements as to the level of reserves that will be required for credit losses. The Company will continue to assess the potential impact that this Update will have on the Company’s consolidated financial statements. The Company anticipates adopting this ASU 2016-13 beginning January 1, 2021.

In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350). This Update simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The amendments in this Update are required for public business entities and other entities that have goodwill reported in their financial statements and have not elected the private company alternative for the subsequent measurement of goodwill. As a result, under this Update, “an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit.” ASU 2017-14 is effective for annual and any interim impairment tests performed in periods beginning after December 15, 2021 for an emerging growth company. Adoption of ASU 2017-04 is not expected to have a significant impact on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU 2017-08, Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities, which is intended to enhance “the accounting for the amortization of premiums for purchased callable debt securities.” This Update shortens the amortization period for certain callable debt securities purchased at a premium by requiring that the premium be amortized to the earliest call date. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments in this Update affects all entities that hold investments in callable debt securities that have an amortized cost basis in excess of the amount that is repayable by the issuer at the earliest call date (that is, at a premium). The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The ASU’s amendments are effective for emerging growth companies for interim and annual periods beginning after December 15, 2019. An entity should apply the amendments in this Update on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Additionally, in the period of adoption, an entity should provide disclosures about a change in accounting principle. The implementation of the provisions of ASU 2017-08 will most likely not have a material impact the Company’s consolidated financial statements. The Company will continue to assess the potential impact that this ASU will have on the Company’s consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting. The amendments in ASU 2017-09 provide guidance about which changes to the terms or conditions of a share- entity to apply modification accounting. An entity should account for the effects of a modification unless all the following are met: (1) The fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification. (2) The vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified. (3) The classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The amendments in ASU 2017-09 are effective for annual periods, and interim within those annual reporting periods, for an emerging growth company, beginning after December 15, 2018. The amendments in this ASU should be applied prospectively to an award modified on or after the adoption date. This ASU did not have a material impact on the Company’s consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. The amendments in this Update expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. An entity should apply the requirements of Topic 718 to nonemployee awards except for specific guidance on inputs to an option pricing model and the attribution of cost (that is, the period of time over which share-based payment awards vest and the pattern of cost recognition over that period). The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The amendments also clarify that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. For emerging growth companies, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. This Update has the potential to only impact share-based payments to members of the Company’s board of directors. The Company will assess the potential impact that this ASU will have on the Company’s consolidated financial statements.

In June 2018, the FASB issued ASU 2018-09, Codification Improvements, which affects a wide variety of topics, including amendments to subtopics: 220-10, Income Statement—Reporting Comprehensive Income—Overall; 470-50, Debt—Modifications and Extinguishments; 480-10, Distinguishing Liabilities from Equity—Overall; 718-740, Compensation—Stock Compensation—Income Taxes; 805-740, Business Combinations—Income Taxes; and, 820-10, Fair Value Measurement—Overall. The transition and effective date guidance is based on the facts and circumstances of each amendment. Some of the amendments in ASU 2018-09 do not require transition guidance and will be effective upon issuance of ASU 2018-09. However, many of the amendments do have transition guidance with effective dates for annual periods beginning after December 15, 2018, for public business entities and after December 15, 2019 for emerging growth companies.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for fair Value Measurement. The amendments in this Update modify the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the concepts in the Concepts Statement, including the consideration of costs and benefits. These disclosure requirements were removed from the topic: (1) The amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, (2) the policy for timing of transfers between levels, and (3) the valuation processes for Level 3 fair value measurements. These disclosure requirements were modified: (1) For investments in certain entities that calculate net asset value, an entity is required to disclose the timing of liquidation of an investee’s assets and the date when restrictions from redemption might lapse only if the investee has communicated the timing to the entity or announced the timing publicly, and (2) the amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. The following disclosure requirements were added: (1) The changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, (2) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. For certain unobservable inputs, an entity may disclose other quantitative information (such as the median or arithmetic average) in lieu of the weighted average if the entity determines that other quantitative information would be a more reasonable and rational method to reflect the distribution of unobservable inputs used to develop Level 3 fair value measurements. In addition, the amendments eliminate “at a minimum” from the phrase “an entity shall disclose at a minimum to promote the appropriate exercise of discretion by entities when considering fair value measurement disclosures and to clarify that materiality is an appropriate consideration of entities and their auditors when evaluating disclosure requirements”. The amendments in this Update are effective for emerging growth companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted upon issuance of this Update. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this Update and delay adoption of the additional disclosures until their effective date. As an emerging growth company, RBB will adopt this Update on January 1, 2021.

In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This Update provides additional guidance to ASU 2015-05, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement” (CCA), on the accounting for implementation, setup, and other upfront costs (collectively referred to as implementation costs) apply to entities that are a customer in a hosting arrangement. This Update applies to entities that are a customer in a hosting arrangement that is a service contract. Costs for implementation activities in the application development stage are capitalized depending on the nature of the costs, while costs incurred during the preliminary project and post-implementation stages are expensed as the activities are performed. This Update also require the customer to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. This Update is effective for an emerging growth company for annual reporting periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021. Early adoption of the amendments in this Update is permitted, including adoption in any interim period, for all entities. The amendments in this Update should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. This Update could be material should RBB incur implementation costs for a CCA that is a service contract.

Acquisition

3 Months Ended

Mar. 31, 2019

Business Combinations [Abstract]

Acquisition

NOTE 3 – ACQUISITION

First American International Corp. Acquisition:

On October 15, 2018, the Company acquired all the assets and assumed all the liabilities of First American International Corp. in exchange for cash of $34.8 million and 3,011,762 shares of RBB common stock, which as valued at $69.6 million in the aggregate on the date of acquisition. FAIC operated nine branches in the New York City metropolitan area. The Company acquired FAIC to strategically establish a presence in the New York area. Goodwill in the amount of $28.4 million was recognized in this acquisition. Goodwill represents the future economic benefits arising from net assets acquired that are not individually identified and separately recognized and is attributable to synergies expected to be derived from the combination of the two entities. Goodwill is not deductible for income tax purposes.

The following table represents the assets acquired and liabilities assumed of FAIC as of October 15, 2018 and the fair value adjustments and amounts recorded by the Company in 2018 under the acquisition method of accounting:

	FAIC			Fair Value			Fair
(dollars in thousands)	Book Value			Adjustments			Value
Assets acquired
Cash and cash equivalents	$	55,891		$	—		$	55,891
Fed funds sold		218			—			218
Interest-bearing deposits in other financial Institutions		3,801			—			3,801
Investments - held to maturity		30,814			(611	)		30,203
Investments - available for sale		14,388			—			14,388
Mortgage loans held for sale		1,915			—			1,915
Loans, gross		721,732			(6,161	)		715,571
Allowance for loan losses		(9,583	)		9,583			—
Bank premises and equipment		5,785			3,439			9,224
Mortgage servicing rights		11,274			(660	)		10,614
Core deposit premium		—			6,738			6,738
Other assets		3,518			(2,119	)		1,399
Total assets acquired	$	839,753		$	10,209		$	849,962
Liabilities assumed
Deposits	$	629,609		$	94		$	629,703
FHLB advances		124,500			—			124,500
Subordinated debentures		7,217			(1,241	)		5,976
Other liabilities		14,940			(1,153	)		13,787
Total liabilities assumed		776,266			(2,300	)		773,966
Excess of assets acquired over liabilities assumed		63,487			12,509			75,996
	$	839,753		$	10,209
Stock consideration								69,602
Cash paid								34,837
Goodwill recognized							$	28,443

Investment Securities

3 Months Ended

Mar. 31, 2019

Investments Debt And Equity Securities [Abstract]

Investment Securities

NOTE 4 - INVESTMENT SECURITIES

The following table summarizes the amortized cost and fair value of available for sale (“AFS”) securities and held to maturity (“HTM”) securities at March 31, 2019 and December 31, 2018, and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income:

			Gross		Gross
(dollars in thousands)	Amortized		Unrealized		Unrealized			Fair
March 31, 2019	Cost		Gains		Losses			Value
Available for sale
Government agency securities	$	1,751	$	—	$	(52	)	$	1,699
SBA agency securities		5,221		—		(102	)		5,119
Mortgage-backed securities- Government sponsored agencies		22,425		17		(296	)		22,146
Collateralized mortgage obligations		12,415		—		(434	)		11,981
Corporate debt securities		17,668		59		(135	)		17,592
Total	$	59,480	$	76	$	(1,019	)	$	58,537

Held to maturity
Municipal taxable securities	$	3,789	$	155	$	—		$	3,944
Municipal securities		5,660		16		(21	)		5,655
Total	$	9,449	$	171	$	(21	)	$	9,599

December 31, 2018
Available for sale
Government agency securities	$	1,873	$	—	$	(58	)	$	1,815
SBA agency securities		5,354		—		(185	)		5,169
Mortgage-backed securities- Government sponsored agencies		23,125		1		(585	)		22,541
Collateralized mortgage obligations		12,696		1		(631	)		12,066
Corporate debt securities		32,615		105		(549	)		32,171
Total	$	75,663	$	107	$	(2,008	)	$	73,762

Held to maturity
Municipal taxable securities	$	4,290	$	142	$	—		$	4,432
Municipal securities		5,671		1		(164	)		5,508
Total	$	9,961	$	143	$	(164	)	$	9,940

One security with a fair value of $692,000 and $697,000 at March 31, 2019 and December 31, 2018, respectively, was pledged to secure a local agency deposit.

The amortized cost and fair value of the investment securities portfolio at March 31, 2019 are shown by expected maturity below. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties.

	Less than One Year				More than One Year to Five Years				More than Five Years to Ten Years				More than Ten Years				Total
	Amortized		Estimated		Amortized		Estimated		Amortized		Estimated		Amortized		Estimated		Amortized		Estimated
(dollars in thousands)	Cost		Fair Value		Cost		Fair Value		Cost		Fair Value		Cost		Fair Value		Cost		Fair Value
March 31, 2019
Government agency securities	$	—	$	—	$	829	$	803	$	922	$	896	$	—	$	—	$	1,751	$	1,699
SBA securities		—		—		808		802		4,413		4,317		—		—		5,221		5,119
Mortgage-backed securities- Government sponsored agencies		1,637		1,631		11,967		11,847		8,821		8,668		—		—		22,425		22,146
Collateralized mortgage obligations		—		—		9,318		8,937		3,097		3,044		—		—		12,415		11,981
Corporate debt securities		2,048		2,043		5,096		5,056		6,499		6,545		4,025		3,948		17,668		17,592
Total available for sale	$	3,685	$	3,674	$	28,018	$	27,445	$	23,752	$	23,470	$	4,025	$	3,948	$	59,480	$	58,537

Municipal taxable securities	$	—	$	—	$	3,284	$	3,372	$	505	$	572	$	—	$	—	$	3,789	$	3,944
Municipal securities		—		—		—		—		858		860		4,802		4,795		5,660		5,655
Total held to maturity	$	—	$	—	$	3,284	$	3,372	$	1,363	$	1,432	$	4,802	$	4,795	$	9,449	$	9,599

The following table summarizes investment securities with unrealized losses at March 31, 2019 and December 31, 2018, aggregated by major security type and length of time in a continuous unrealized loss position:

	Less than Twelve Months							Twelve Months or More							Total
(dollars in thousands)	Unrealized Losses			Estimated Fair Value		No. of Issuances		Unrealized Losses			Estimated Fair Value		No. of Issuances		Unrealized Losses			Estimated Fair Value		No. of Issuances
March 31, 2019
Government agency securities	$	—		$	—		—	$	(52	)	$	1,699		2	$	(52	)	$	1,699		2
SBA securities		—			—		—		—			—		—		—			—		—
Mortgage-backed securities- Government sponsored agencies		(1	)		253		1		(397	)		23,515		25		(398	)		23,768		26
Collateralized mortgage obligations		—			—		—		(434	)		11,981		8		(434	)		11,981		8
Corporate debt securities		(14	)		1,486		2		(121	)		11,047		7		(135	)		12,533		9
Total available for sale	$	(15	)	$	1,739		3	$	(1,004	)	$	48,242		42	$	(1,019	)	$	49,981		45

Municipal securities		—			—		—	$	(21	)	$	1,853		4	$	(21	)	$	1,853		4
Total held to maturity	$	—		$	—		—	$	(21	)	$	1,853		4	$	(21	)	$	1,853		4

December 31, 2018
Government agency securities	$	—		$	—		—	$	(58	)	$	1,815		2	$	(58	)	$	1,815		2
SBA securities		—			—		—		(185	)		5,169		4		(185	)		5,169		4
Mortgage-backed securities- Government sponsored agencies		(12	)		1,641		1		(573	)		20,602		22		(585	)		22,243		23
Collateralized mortgage obligations		—			—		—		(631	)		12,065		8		(631	)		12,065		8
Corporate debt securities		(61	)		4,600		4		(488	)		6,548		4		(549	)		11,148		8
Total available for sale	$	(73	)	$	6,241		5	$	(1,935	)	$	46,199		40	$	(2,008	)	$	52,440		45

Municipal securities	$	(104	)	$	2,468		6	$	(60	)	$	2,174		4	$	(164	)	$	4,642		10
Total held to maturity	$	(104	)	$	2,468		6	$	(60	)	$	2,174		4	$	(164	)	$	4,642		10

Unrealized losses have not been recognized into income because the issuer bonds are of high credit quality, management does not intend to sell, it is not more likely than not that management would be required to sell the securities prior to their anticipated recovery and the decline in fair value is largely due to changes in interest rates. The fair value is expected to recover as the bonds approach maturity.

Management evaluates securities for other-than-temporary impairment (“OTTI”) on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings.

Loans and Allowance for Loan Losses

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Loans and Allowance for Loan Losses

NOTE 5 - LOANS AND ALLOWANCE FOR LOAN LOSSES

The Company's loan portfolio consists primarily of loans to borrowers within the Los Angeles, California metropolitan area, the New York City metropolitan area, and Las Vegas, Nevada. Although the Company seeks to avoid concentrations of loans to a single industry or based upon a single class of collateral, real estate and real estate associated businesses are among the principal industries in the Company's market area and, as a result, the Company's loan and collateral portfolios are, to some degree, concentrated in those industries.

The following tables present the balance and activity related to the allowance for loan losses for held for investment loans by type for the periods presented.

	Three months ended March 31,
	2019									2018
(dollars in thousands)	Real Estate		Commercial			Other		Total		Real Estate		Commercial			Unallocated			Other		Total
Allowance for loan losses:
Beginning balance	$	13,437	$	4,140		$	—	$	17,577	$	9,309	$	4,044		$	420		$	—	$	13,773
Additions (reductions) to the allowance charged to expense		952		(405	)		3		550		653		(118	)		(351	)		—		184
Recoveries on loans charged-off		—		109			—		109		—		—			—			—		—
Less loans charged-off		—		—			—		—		—		—			—			—		—
Ending balance	$	14,389	$	3,844		$	3	$	18,236	$	9,962	$	3,926		$	69		$	—	$	13,957

The following table presents the recorded investment in loans and impairment method as of and for the three months ended March 31, 2019 and March 31, 2018, and the activity in the allowance for loan losses for the year ended December 31, 2018, by portfolio segment:

(dollars in thousands)
As of and for the three months ended March 31, 2019	Real Estate		Commercial		Other		Total
Reserves:
Specific	$	—	$	11	$	—	$	11
General		14,389		3,833		3		18,225
Total allowance for loan losses	$	14,389	$	3,844	$	3	$	18,236
Loans evaluated for impairment:
Individually		2,365		221		—		2,586
Collectively		1,765,585		351,906		336		2,117,827
Total loans, net of deferred loan fees and unaccreted discount on acquired loans	$	1,767,950	$	352,127	$	336	$	2,120,413

As of and for the three months ended March 31, 2018	Real Estate		Commercial		Unallocated		Total
Reserves:
Specific	$	—	$	—	$	—	$	—
General		9,962		3,926		69		13,957
Total allowance for loan losses	$	9,962	$	3,926	$	69	$	13,957
Loans evaluated for impairment:
Individually	$	2,393	$	2,072	$	—	$	4,465
Collectively		866,176		390,974		—		1,257,150
Loans acquired with deteriorated credit quality		313		—		—		313
Total loans, net of deferred loan fees and unaccreted discount on acquired loans	$	868,882	$	393,046	$	—	$	1,261,928

As of and for the year ended December 31, 2018	Real Estate		Commercial			Unallocated			Total
Allowance for loan losses:
Beginning of year	$	9,309	$	4,044		$	420		$	13,773
Provisions		4,128		761			(420	)		4,469
Charge-offs		—		(701	)		—			(701	)
Recoveries		—		36			—			36
	$	13,437	$	4,140		$	—		$	17,577
Reserves:
Specific	$	—	$	44		$	—		$	44
General		13,393		4,140			—			17,533
Loans acquired with deteriorated credit quality		—		—			—			—
Total allowance for loan losses	$	13,393	$	4,184		$	—		$	17,577
Loans evaluated for impairment:
Individually	$	2,309	$	972		$	—		$	3,281
Collectively		1,750,896		387,838			—			2,138,734
Total loans, net of deferred loan fees and unaccreted discount on acquired loans	$	1,753,205	$	388,810		$	—		$	2,142,015

The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as current financial information, historical payment experience, collateral adequacy, credit documentation, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. This analysis typically includes larger, non-homogeneous loans such as commercial real estate and commercial and industrial loans. This analysis is performed on an ongoing basis as new information is obtained. The Company uses the following definitions for risk ratings:

Pass - Loans classified as pass include loans not meeting the risk ratings defined below.

Special Mention - Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution's credit position at some future date.

Substandard - Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected.

Impaired - A loan is considered impaired, when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Additionally, all loans classified as troubled debt restructurings are considered impaired.

The risk category of loans by class of loans was as follows at March 31, 2019 and December 31, 2018:

(dollars in thousands)			Special
March 31, 2019	Pass		Mention		Substandard		Impaired		Total
Real estate:
Construction and land development	$	125,412	$	—	$	—	$	274	$	125,686
Commercial real estate		727,546		6,333		20,343		2,091		756,313
Single-family residential mortgages		884,780		—		1,171		—		885,951
Commercial:
Other		256,674		7,749		5,133		—		269,556
SBA		77,241		135		4,974		221		82,571
Other:		336		—		—		—		336
Total loans	$	2,071,989	$	14,217	$	31,621	$	2,586	$	2,120,413

(dollars in thousands)			Special
December 31, 2018	Pass		Mention		Substandard		Impaired		Total
Real estate:
Construction and land development	$	112,959	$	—	$	—	$	276	$	113,235
Commercial real estate		743,123		7,069		6,496		2,033		758,721
Single-family residential mortgages		880,860		—		389		—		881,249
Commercial:
Other		295,226		6,286		2,798		—		304,310
SBA		79,057		—		4,471		972		84,500
Total loans	$	2,111,225	$	13,355	$	14,154	$	3,281	$	2,142,015

The following table presents the aging of the recorded investment in past-due loans at March 31, 2019 and December 31, 2018 by class of loans:

(dollars in thousands)	30-59		60-89		90 Days		Total		Loans Not		Total		Non-Accrual
March 31, 2019	Days		Days		Or More		Past Due		Past Due		Loans		Loans ⁽¹⁾
Real estate:
Construction and land development	$	—	$	—	$	—	$	—	$	125,686	$	125,686	$	—
Commercial real estate		386		—		—		386		755,927		756,313		—
Single-family residential mortgages		2,056		—		—		2,056		883,895		885,951		—
Commercial:
Other		690		—		—		690		268,866		269,556		—
SBA		2,026		—		166		2,192		80,379		82,571		166
Other:		—		—		—		—		336		336		—
	$	5,158	$	—	$	166	$	5,324	$	2,115,089	$	2,120,413	$	166
Real estate:
Single-family residential mortgages held for sale	$	507	$	—	$	—	$	507	$	374,923	$	375,430	$	—

December 31, 2018
Real estate:
Construction and land development	$	—	$	—	$	—	$	—	$	113,235	$	113,235	$	—
Commercial real estate		—		678		—		678		758,043		758,721		—
Single-family residential mortgages		1,548		950		—		2,498		878,751		881,249		—
Commercial:
Other		—		—		—		—		304,310		304,310		—
SBA		957		—		914		1,871		82,629		84,500		914
	$	2,505	$	1,628	$	914	$	5,047	$	2,136,968	$	2,142,015	$	914
Real estate:
Single-family residential mortgages held for sale	$	—	$	458	$	—	$	458	$	434,064	$	434,522	$	—

⁽¹⁾

Included in total loans.

Information relating to individually impaired loans presented by class of loans was as follows at March 31, 2019 and December 31, 2018:

(dollars in thousands)	Principal		Recorded		Average		Interest		Related
March 31, 2019	Balance		Investment		Balance		Income		Allowance
With no related allowance recorded
Construction and land development	$	275	$	275	$	275	$	6	$	—
Commercial real estate		2,090		2,090		2,100		17		—
Residential mortgage loans		—		—		—		—		—
Commercial - SBA		55		55		56		1		—

With related allowance recorded
Commercial - SBA		166		166		166		—		11
Total	$	2,586	$	2,586	$	2,597	$	24	$	11

(dollars in thousands)	Principal		Recorded		Average		Interest		Related
December 31, 2018	Balance		Investment		Balance		Income		Allowance
With no related allowance recorded
Construction and land development	$	276	$	276	$	283	$	23	$	—
Commercial real estate		2,033		2,033		2,126		134		—
Residential mortgage loans		—		—		—		—		—
Commercial - SBA		797		1,498		1,377		19		—

With related allowance recorded
Commercial - SBA		175		175		193		1		44
Total	$	3,281	$	3,982	$	3,979	$	177	$	44

No interest income was recognized on a cash basis for the three months ended March 31, 2019 and 2018 and for the year ended December 31, 2018.

The Company had four loans identified as troubled debt restructurings (“TDRs”) at March 31, 2019 and December 31, 2018, respectively, with aggregate balances of $2.4 million. There were no specific reserves on TDRs as of March 31, 2019 or December 31, 2018. There are no commitments to lend additional amounts at March 31, 2019 and December 31, 2018 to customers with outstanding loans that are classified as TDRs.

There were no loans modified as TDRs during the three months ended March 31, 2019. There was one TDRs during the three months ended March 31, 2018.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Loan Servicing

3 Months Ended

Mar. 31, 2019

Loan Servicing [Abstract]

Loan Servicing

NOTE 6 - LOAN SERVICING

Mortgage and SBA loans serviced for others are not reported as assets. The principal balances at March 31, 2019 and December 31, 2018 are as follows:

	March 31,		December 31,
(dollars in thousands)	2019		2018
Loans serviced for others:
Mortgage loans	$	1,654,411	$	1,586,499
SBA loans	$	181,627	$	184,664
Commercial real estate loans	$	4,267	$	2,838

The fair value of servicing assets for mortgage loans was $13.7 million and $15.3 million at March 31, 2019 and December 31, 2018, respectively. The fair value of servicing assets for SBA loans was $6.3 million and $6.1 million at March 31, 2019 and December 31, 2018, respectively. Estimates of the loan servicing asset fair value are derived through a discounted cash flow analysis. Portfolio characteristics include loan delinquency rates, age of loans, note rate and geography. The assumptions embedded in the valuation are obtained from a range of metrics utilized by active buyers in the market place. The analysis accounts for recent transactions, and supply and demand within the market.

Servicing fees net of servicing asset amortization totaled $840,000 and $(31,000) for the three months ended March 31, 2019 and 2018, respectively. The increase was primarily due to increases in servicing income, partially offset by servicing asset write-downs. Write-downs of servicing assets was caused by loan payoffs, primarily caused by customers repaying SBA loans.

When mortgage and SBA loans are sold with servicing retained, servicing rights are initially recorded at fair value with the income statement effect recorded in gains on sales of loans. Fair value is based on a valuation model that calculates the present value of estimated future net servicing income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans.

Servicing rights are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount. If the Company later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income.

Servicing fee income is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal. The amortization of mortgage servicing rights is netted against loan servicing fee income.

	Three months ended						Three months ended
	March 31, 2019						March 31, 2018
	Mortgage			SBA			Mortgage			SBA
(dollars in thousands)	Loans			Loans			Loans			Loans
Servicing assets:
Beginning of year	$	12,858		$	4,512		$	1,540		$	4,417
Additions		604			112			315			484
Disposals		(33	)		(127	)		(39	)		(425	)
Amortized to expense		(466	)		(172	)		(155	)		(158	)
End of period	$	12,963		$	4,325		$	1,661		$	4,318

Goodwill and Intangibles

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangibles

NOTE 7 - GOODWILL AND INTANGIBLES

Goodwill is generally determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill resulting from whole bank acquisitions is not amortized, but tested for impairment at least annually. The Company has selected December 31st as the date to perform the annual impairment test. Goodwill amounted to $58.4 million at March 31, 2019 and $58.4 million at December 31, 2018, and is the only intangible asset with an indefinite life on the balance sheet. There were no impairment losses recognized on goodwill during the three months ended March 31, 2019 and 2018.

Other intangible assets consist of core deposit intangible ("CDI") assets arising from whole bank acquisitions. CDI assets are amortized on an accelerated method over their estimated useful life of 8 to 10 years. The unamortized balance at March 31, 2019 and December 31, 2018 was $7.2 million and $7.6 million, respectively. CDI amortization expense was $388,000 and $81,000 for the three months ended March 31, 2019 and March 31, 2018, respectively.

Estimated CDI amortization expense for future years is as follows:

(dollars in thousands)
As of March 31:
Remainder of 2019	$	1,112
2020		1,284
2021		1,056
2022		879
2023		749
Thereafter		2,132
Total	$	7,212

Deposits

3 Months Ended

Mar. 31, 2019

Maturities Of Time Deposits [Abstract]

Deposits

NOTE 8 - DEPOSITS

At March 31, 2019, the scheduled maturities of time deposits are as follows:

(dollars in thousands)	March 31, 2019
One year	$	1,143,844
Two to three years		137,650
Over three years		2,934
Total	$	1,284,428

Long-term Debt

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Long-term Debt

NOTE 9 - LONG-TERM DEBT

In March 2016, the Company issued $50 million of 6.5% fixed to floating rate subordinated debentures, due March 31, 2026. The interest rate is fixed through March 31, 2021 and floats at 3 month LIBOR plus 516 basis points thereafter. The Company can redeem these subordinated debentures beginning March 31, 2021. The subordinated debentures are considered Tier 2 capital at the Company. The Company allocated $35 million to the Bank as Tier 1 capital.

In November 2018, the Company issued $55 million of 6.18% fixed to floating rate subordinated debentures, due December 1, 2028. The interest rate is fixed through December 1, 2023 and floats at 3 month LIBOR plus 315 basis points thereafter. The Company can redeem these subordinated debentures beginning December 1, 2023. The subordinated debentures are considered Tier 2 capital at the Company. The Company allocated $25 million to the Bank as Tier 1 capital.

At March 31, 2019 and December 31, 2018, long-term debt was as follows:

	March 31,		December 31,
(dollars in thousands)	2019		2018
Principal	$	105,000	$	105,000
Unamortized debt issuance costs	$	1,207	$	1,292

Subordinated Debentures

3 Months Ended

Mar. 31, 2019

Debt Instruments [Abstract]

Subordinated Debentures

NOTE 10 - SUBORDINATED DEBENTURES

The Company, through the acquisition of TFC Bancorp in 2016, acquired TFC Statutory Trust (the “Trust”). The Trust contained a pooled private offering of 5,000 trust preferred securities with a liquidation amount of $1,000 per security. TFC Bancorp issued $5 million of subordinated debentures to the Trust in exchange for ownership of all of the common security of the Trust and the proceeds of the preferred securities sold by the Trust. The Company is not considered the primary beneficiary of this Trust (variable interest entity), therefore the Trust is not consolidated in the Company's financial statements, but rather the subordinated debentures are shown as a liability at market value as of the close of the acquisition, which was $3.3 million. There was a $1.9 million valuation reserve recorded to arrive at market value, which is treated as a yield adjustment and is amortized over the life of the security. The amount of amortization expense recognized for the three months ended March 31, 2019 and 2018 was $42,000 and $23,000. The Company also purchased an investment in the common stock of the Trust for $155,000, which is included in other assets. The Company may redeem the subordinated debentures, subject to prior approval by the Board of Governors of the Federal Reserve System on or after March 15, 2012, at 100% of the principal amount, plus accrued and unpaid interest. The subordinated debentures mature on March 15, 2037. The Company has the option to defer interest payments on the subordinated debentures from time to time for a period not to exceed five consecutive years. The Company has been paying interest on a quarterly basis. The subordinated debentures may be included in Tier I capital (with certain limitations applicable) under current regulatory guidelines and interpretations. The subordinated debentures have a variable rate of interest equal to the three month London Interbank Offered Rate (LIBOR) plus 1.65%, which was 4.26% as of March 31, 2019 and 4.45% at December 31, 2018.

In October 2018, the Company, through the acquisition of First American International Corp., acquired First American International Statutory Trust I (“FAIC Trust”), a Delaware statutory trust formed in December 2004. The Trust issued 7,000 units of thirty-year fixed to floating rate capital securities with an aggregate liquidation amount of $7,000,000 to an independent investor, and FAIC issued $7 million of subordinated debentures to the FAIC Trust and all of its common securities, amounting to $217,000, which is included in other assets. There was a $1.2 million valuation reserve recorded to arrive at market value which is treated as a yield adjustment and is amortized over the life of the security. The Company has the option to defer interest payments on the subordinated debentures from time to time for a period not to exceed five consecutive years. The subordinated debentures have a variable rate of interest equal to the three-month LIBOR plus 2.25% through final maturity on December 15, 2034. The rate at March 31, 2019, was 4.86% and 5.04% at December 31, 2018.

The Company paid interest expenses of $144,000 and $42,000, respectively, during the three months ended March, 31 2019 and 2018. The amount of amortization expense recognized was $42,000 and $23,000, respectively, during the three months ended March 31, 2018 and 2017.

For regulatory reporting purposes, the Federal Reserve Board has indicated that the capital securities qualify as Tier I capital of the Company subject to previously specified limitations, until further notice. If regulators make a determination that the capital securities can no longer be considered in regulatory capital, the securities become callable and the Company may redeem them.

In July 2017, British banking regulators announced plans to eliminate the LIBOR rate by the end of 2021, before these subordinated notes and debentures mature. For these subordinated notes and debentures, there are provisions for amendments to establish a new interest rate benchmark.

Borrowing Arrangements

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Borrowing Arrangements

NOTE 11 - BORROWING ARRANGEMENTS

The Company has established secured and unsecured lines of credit. The Company may borrow funds from time to time on a term or overnight basis from the Federal Home Loan Bank of San Francisco ("FHLB"), the Federal Reserve Bank of San Francisco ("FRB") and other financial institutions as indicated below.

Federal Funds Arrangements with Commercial Banks. At March 31, 2019, the Company may borrow on an unsecured basis, up to $20.0 million, $10.0 million, $12.0 million and $5.0 million overnight from Zions Bank, Wells Fargo Bank, First Tennessee National Bank, and Pacific Coast Bankers' Bank, respectively.

Letter of Credit Arrangements. At March 31, 2019 the Company had an unsecured commercial letter of credit line with Wells Fargo Bank for $2.0 million.

FRB Secured Line of Credit. The secured borrowing capacity with the FRB of $15.5 million at March 31, 2019 is collateralized by loans pledged with a carrying value of $27.2 million.

FHLB Secured Line of Credit. The secured borrowing capacity with the FHLB of $823.4 million at March 31, 2019 is collateralized by loans pledged with a carrying value of $943.0 million.

At March 31, 2019, the Company had $275.0 million at 2.60% in overnight advances with the FHLB and $319.5 million at 2.56% at December 31, 2018. There were no amounts outstanding under any of the other borrowing arrangements above as of March 31, 2019 and at December 31, 2018 except FHLB advances.

Income Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 12 - INCOME TAXES

The asset and liability method is used in accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse.

During the three months ended March 31, 2019 and 2018, the Company recorded an income tax provision of $3.9 million and $1.6 million, respectively, reflecting an effective tax rate of 27.1% and 15.2% for the three months ended March 31, 2019 and 2018, respectively. The Company recognized $133,000 and $1.4 million of tax benefit from stock option exercises for the three months ended March 31, 2019 and 2018.

Commitments

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments

NOTE 13 - COMMITMENTS

The Company leases several of its operating facilities under various noncancellable operating leases expiring at various dates through 2028. The Company is also responsible for common area maintenance, taxes and insurance at the various branch locations.

Future minimum rent payments on the Company’s leases were as follows at March 31, 2019:

(dollars in thousands)
Year ending December 31:
2019 remaining	$	4,212
2020		5,081
2021		3,639
2022		3,470
2023		2,936
Thereafter		9,150
Total	$	28,488

The minimum rent payments shown above are given for the existing lease obligation and are not a forecast of future rental expense. Total rental expense, recognized on a straight-line basis, was $1.5 million and $437,000 for the three months ended March 31, 2019 and 2018, respectively.

In the ordinary course of business, the Company enters into financial commitments to meet the financing needs of its customers. These financial commitments include commitments to extend credit, unused lines of credit, commercial and similar letters of credit and standby letters of credit. Those instruments involve to varying degrees, elements of credit and interest rate risk not recognized in the Company's financial statements.

The Company's exposure to loan loss in the event of nonperformance on these financial commitments is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments as it does for loans reflected in the financial statements.

At March 31, 2019 and December 31, 2018, the Company had the following financial commitments whose contractual amount represents credit risk:

	March 31,		December 31,
(dollars in thousands)	2019		2018
Commitments to extend credit	$	250,579	$	267,920
Commercial and similar letters of credit		1,179		1,042
Standby letters of credit		3,674		3,374
Total	$	255,432	$	272,336

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Since many of the commitments are expected to expire without being drawn upon, the total amounts do not necessarily represent future cash requirements. The Company evaluates each client's credit worthiness on a case-by-case basis. The amount of collateral obtained if deemed necessary by the Company is based on management's credit evaluation of the customer.

The Company is involved in various matters of litigation which have arisen in the ordinary course of business and accruals for estimates of potential losses have been provided when necessary and appropriate under generally accepted accounting principles. In the opinion of management, the disposition of such pending litigation will not have a material effect on the Company's financial statements.

Related Party Transactions

3 Months Ended

Mar. 31, 2019

Related Party Transactions

NOTE 14 - RELATED PARTY TRANSACTIONS

Loans to principal officers, directors, and their affiliates were as follows:

	March 31,			December 31,
(dollars in thousands)	2019			2018
Beginning balance	$	3,600		$	2,300
New loans and advances		3,600			7,400
Repayments		(3,600	)		(6,100	)
Ending balance	$	3,600		$	3,600

Loan commitments outstanding to executive officers, directors and their related interests with whom they are associated totaled approximately $800,000 at March 31, 2019 and December 31, 2018.

Deposits from principal officers, directors, and their affiliates at March 31, 2019 and December 31, 2018 were $51.1 million and $52.1 million, respectively.

Stock-based Compensation

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation

NOTE 15 - STOCK-BASED COMPENSATION

RBB Bancorp 2010 Stock Option Plan

Under the RBB Bancorp 2010 Stock Option Plan (the “2010 Plan”), the Company was permitted to grant awards to eligible persons in the form of qualified and non-qualified stock options. The Company reserved up to 30% of the issued and outstanding shares of common stock as of the date the Company adopted the 2010 Plan or 3,494,478 shares, for issuance under the 2010 Plan. After approval of the 2017 Omnibus Stock Incentive Plan (the “OSIP”) at the Company’s annual meeting on May 23, 2017, no additional grants will be made under the 2010 Plan. The 2010 Plan has been terminated and options that were granted under that Plan have become subject to the OSIP. Awards that were granted under the 2010 Plan will remain exercisable pursuant to the terms and conditions set forth in individual award agreements, but such awards will be assumed and administered under the OSIP. The 2010 Plan award agreements allow for acceleration of exercise privileges of grants upon occurrence of a change in control of the Company. If a participant’s job is terminated for cause, then all unvested awards expire at the date of termination.

RBB Bancorp 2017 Omnibus Stock Incentive Plan

The OSIP was adopted by the Company’s board of directors on January 18, 2017 and approved by the Company’s shareholders at the Company’s annual meeting on May 23, 2017. The OSIP was designed to ensure continued availability of equity awards that will assist the Company in attracting and retaining competent managerial personnel and rewarding key employees, directors and other service providers for high levels of performance. Pursuant to the OSIP, the Company’s board of directors are allowed to grant awards to eligible persons in the form of qualified and non-qualified stock options, restricted stock, restricted stock units, stock appreciation rights and other incentive awards. The Company has reserved up to 30% of issued and outstanding shares of common stock as of the date the Company adopted the OSIP, or 3,848,341 shares. This represents 19% of the issued and outstanding shares of the Company’s common stock as of March 31, 2019. As of March 31, 2019, there were 1,254,045 shares of common stock available for issuance under the OSIP. Awards vest, become exercisable and contain such other terms and conditions as determined by the board of directors and set forth in individual agreements with the employees receiving the awards. The OSIP enables the board of directors to set specific performance criteria that must be met before an award vests. The OSIP allows for acceleration of vesting and exercise privileges of grants if a participant’s termination of employment is due to a change in control, death or total disability. If a participant’s job is terminated for cause, then all awards expire at the date of termination.

The Company recognized stock-based compensation expense of $231,000 and $131,000 and recognized income tax benefits on that expense of $92,000 and $1.4 million for the three months ended March 31, 2019 and 2018, respectively.

Regulatory Matters

3 Months Ended

Mar. 31, 2019

Regulated Operations [Abstract]

Regulatory Matters

NOTE 16 - REGULATORY MATTERS

Holding companies (with assets over $1 billion at the beginning of the year) and banks are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory - and possibly additional discretionary - actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements.

In July 2013, the federal bank regulatory agencies approved the final rules implementing the Basel Committee on Banking Supervision's capital guidelines for U.S. banks. The new rules became effective on January 1, 2015, with certain of the requirements phased-in over a multi-year schedule. Under the rules, minimum requirements increased for both the quantity and quality of capital held by the Bank. The rules include a new common equity Tier 1 (“CET1”) capital to risk-weighted assets ratio with minimums for capital adequacy and prompt corrective action purposes of 4.5% and 6.5%, respectively. The minimum Tier 1 capital to risk-weighted assets ratio was raised from 4.0% to 6.0% under the capital adequacy framework and from 6.0% to 8.0% to be well-capitalized under the prompt corrective action framework. In addition, the rules introduced the concept of a "conservation buffer" of 2.5% applicable to the three capital adequacy risk-weighted asset ratios (CET1, Tier 1, and Total). The implementation of the capital conservation buffer began on January 1, 2016 at 0.625% and will be phased in over a four-year period (increasing by that amount on each subsequent January 1, until it reaches 2.5% on January 1, 2019). The capital conservation buffer for March 31, 2019 is 12.38% and 10.80% for the Bank and RBB, respectively. If the capital adequacy minimum ratios plus the phased-in conservation buffer amount exceed actual risk-weighted capital ratios, then dividends, share buybacks, and discretionary bonuses to executives could be limited in amount.

Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measures of the Bank's assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. Capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (set forth in the table below) of total, Tier 1 and CET1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). As permitted by the regulators for financial institutions that are not deemed to be “advanced approaches” institutions, the Company has elected to opt out of the Basel III requirement to include accumulated other comprehensive income in risk-based capital. Management believes, at March 31, 2019 and December 31, 2018, that the Bank satisfied all capital adequacy requirements to which it is subject.

As defined in applicable regulations and set forth in the tables below, RBB and the Bank continue to exceed the regulatory capital minimum requirements and the Bank continues to exceed the "well capitalized" standards at the dates indicated:

						Amount of Capital Required
											To Be Well-Capitalized
						Minimum Required for					Under Prompt Corrective
	Actual					Capital Adequacy Purposes					Provisions
(dollars in thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of March 31, 2019:
Tier 1 Leverage Ratio
Consolidated	$	331,144		11.61	%	NA		NA			NA		NA
Bank		382,681		13.43	%		113,970		4.0	%		142,462		5.0	%
Common Equity Tier 1 Risk- Based Capital Ratio
Consolidated		321,596		16.29	%	NA		NA			NA		NA
Bank		382,681		19.39	%		88,669		4.5	%		128,078		6.5	%
Tier 1 Risk-Based Capital Ratio
Consolidated		331,144		16.77	%	NA		NA			NA		NA
Bank		382,681		19.39	%		118,225		6.0	%		157,634		8.0	%
Total Risk-Based Capital Ratio
Consolidated		453,811		22.98	%	NA		NA			NA		NA
Bank		401,555		20.35	%		157,634		8.0	%		197,042		10.0	%

						Amount of Capital Required
											To Be Well-Capitalized
						Minimum Required for					Under Prompt Corrective
	Actual					Capital Adequacy Purposes					Provisions
(dollars in thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2018:
Tier 1 Leverage Ratio
Consolidated	$	321,407		11.80	%	NA		NA			NA		NA
Bank		370,304		13.66	%		108,445		4.0	%		135,556		5.0	%
Common Equity Tier 1 Risk- Based Capital Ratio
Consolidated		311,901		15.28	%	NA		NA			NA		NA
Bank		370,304		18.17	%		91,722		4.5	%		132,487		6.5	%
Tier 1 Risk-Based Capital Ratio
Consolidated		321,407		15.74	%	NA		NA			NA		NA
Bank		370,304		18.17	%		122,296		6.0	%		163,061		8.0	%
Total Risk-Based Capital Ratio
Consolidated		443,379		21.71	%	NA		NA			NA		NA
Bank		388,569		19.07	%		163,061		8.0	%		203,826		10.0	%

The California Financial Code generally acts to prohibit banks from making a cash distribution to its shareholders in excess of the lesser of the bank's undivided profits or the bank's net income for its last three fiscal years less the amount of any distribution made by the bank's shareholders during the same period.

The California General Corporation Law generally acts to prohibit companies from paying dividends on common stock unless its retained earnings, immediately prior to the dividend payment, equals or exceeds the amount of the dividend. If a company fails this test, then it may still pay dividends if after giving effect to the dividend the company's assets are at least 125% of its liabilities.

Additionally, the FRB has issued guidance which requires that they be consulted before payment of a dividend if a financial holding company does not have earnings over the prior four quarters of at least equal to the dividend to be paid, plus other holding company obligations.

Fair Value Measurements

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

NOTE 17 - FAIR VALUE MEASUREMENTS

The following is a description of valuation methodologies used for assets and liabilities recorded at fair value:

Securities: The fair values of securities available for sale are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1) or matrix pricing, which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted prices for specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2).

Other Real Estate Owned: Nonrecurring adjustments to certain commercial and residential real estate properties classified as other real estate owned are measured at the lower of carrying amount or fair value, less costs to sell. In cases where the carrying amount exceeds the fair value, less costs to sell, an impairment loss is recognized. Fair values are generally based on third party appraisals of the property which are commonly adjusted by management to reflect an expectation of the amount to be ultimately collected and selling costs (Level 3).

Appraisals for other real estate owned are performed by state licensed appraisers (for commercial properties) or state certified appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. When a Notice of Default is recorded, an appraisal report is ordered. Once received, a member of the credit administration department reviews the assumptions and approaches utilized in the appraisal as well as the overall resulting fair value in comparison to independent data sources such as recent market data or industry wide-statistics for residential appraisals. Commercial appraisals are sent to an independent third party to review. The Company also compares the actual selling price of collateral that has been sold to the most recent appraised value to determine what additional adjustments, if any, should be made to the appraisal values on any remaining other real estate owned to arrive at fair value. If the existing appraisal is older than twelve months a new appraisal report is ordered. No significant adjustments to appraised values have been made as a result of this comparison process as of March 31, 2019.

The following table provides the hierarchy and fair value for each major category of assets and liabilities measured at fair value at March 31, 2019 and December 31, 2018:

(dollars in thousands)	Fair Value Measurements Using:
March 31, 2019	Level 1		Level 2		Level 3		Total
Assets measured at fair value:
On a recurring basis:
Securities available for sale
Government agency securities			$	1,699			$	1,699
SBA agency securities				5,119				5,119
Mortgage-backed securities				22,146				22,146
Collateralized mortgage obligations				11,981				11,981
Corporate debt securities				17,592				17,592
	$	—	$	58,537	$	—	$	58,537

On a non-recurring basis:
Other real estate owned	$	—	$	—	$	2,056	$	2,056

December 31, 2018
Assets measured at fair value:
On a recurring basis:
Securities available for sale
Government agency securities			$	1,815				1,815
SBA agency securities				5,169				5,169
Mortgage-backed securities				22,541				22,541
Collateralized mortgage obligations				12,066				12,066
Corporate debt securities				32,171				32,171
	$	—	$	73,762	$	—	$	73,762

On a non-recurring basis:
Other real estate owned	$	—	$	—	$	1,101	$	1,101

No write-downs to OREO were recorded in for the three months ended March 31, 2019 or for the year ended December 31, 2018.

Quantitative information about the Company's OREO non-recurring Level 3 fair value measurements at March 31, 2019 and December 31, 2018 is as follows:

Weighted-

(dollars in thousands)

Fair Value

Valuation

Unobservable

Adjustment

Average

March 31, 2019

Amount

Technique

Input

Range

Adjustment

Other real estate owned

2,056

Third Party

Management Adjustments

15%

Appraisals

to Reflect Current

Conditions and Selling

Costs

December 31, 2018

Other real estate owned

1,101

Third Party

Management Adjustments

16%

Appraisals

to Reflect Current

Conditions and Selling

Costs

OREO as of March 31, 2019 consists of two single-family residences with a fair value of $1.1 million and one non-farm, non-residential property with a fair value of $965,000.

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

NOTE 18 - FAIR VALUE OF FINANCIAL INSTRUMENTS

The fair value of a financial instrument is the amount at which the asset or obligation could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale. Fair value estimates are made at a specific point in time based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the entire holdings of a particular financial instrument. Because no market value exists for a significant portion of the financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature, involve uncertainties and matters of judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Fair value estimates are based on financial instruments both on and off the balance sheet without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Additionally, tax consequences related to the realization of the unrealized gains and losses can have a potential effect on fair value estimates and have not been considered in many of the estimates.

The following methods and assumptions were used to estimate the fair value of significant financial instruments not previously presented:

Cash and Cash Equivalents

The carrying amounts of cash and short-term instruments approximate fair values.

Time Deposits in Other Banks

Fair values for time deposits with other banks are estimated using discounted cash flow analyses, using interest rates currently being offered with similar terms.

Mortgage Loans Held for Sale

The Company records mortgage loans held for sale at fair value based on the net premium received on recent sales of mortgage loans for identical pools of loans.

Loans

For variable rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying amounts. The fair values for all other loans are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality. In accordance with the prospective adoption of ASU 2016-01, the fair value of loans as of March 31, 2019 was measured using an exit price notion. The fair value of loans as of December 31, 2018 was measured using an exit price notion.

Deposits

The fair values disclosed for demand deposits, including interest and non-interest demand accounts, savings, and certain types of money market accounts are, by definition based on carrying value. Fair value for fixed-rate certificates of deposit is estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregate expected monthly maturities on time deposits. Early withdrawal of fixed-rate certificates of deposit is not expected to be significant

Long-Term Debt

The fair values of the Company’s long-term borrowings are estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements resulting in a Level 2 classification.

Subordinated Debentures

The fair values of the Company’s Subordinated Debentures are estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements resulting in a Level 3 classification.

Off-Balance Sheet Financial Instruments

The fair value of commitments to extend credit and standby letters of credit is estimated using the fees currently charged to enter into similar agreements. The fair value of these financial instruments is not material.

The fair value hierarchy level and estimated fair value of significant financial instruments at March 31, 2019 and December 31, 2018 are summarized as follows:

		March 31,				December 31,
		2019				2018
	Fair Value	Carrying		Fair		Carrying		Fair
(dollars in thousands)	Hierarchy	Value		Value		Value		Value
Financial Assets:
Cash and due from banks	Level 1	$	250,079	$	250,079	$	147,685	$	147,685
Interest-earning deposits in other financial institutions	Level 1		1,196		1,196		600		600
Investment securities - AFS	Level 2		58,537		58,537		73,762		73,762
Investment securities - HTM	Level 2		9,449		9,599		9,961		9,940
Mortgage loans held for sale	Level 1		375,430		379,289		434,522		438,948
Loans, net	Level 3		2,102,177		2,131,065		2,124,438		2,114,341
Equity Security	Level 3		10,250		10,250		10,039		10,039

Financial Liabilities:
Deposits	Level 2	$	2,184,340	$	2,178,281	$	2,144,041	$	2,143,196
FHLB advances	Level 2		275,000		275,000		319,500		319,500
Long-term debt	Level 2		103,793		100,296		103,708		98,509
Subordinated debentures	Level 3		9,548		10,760		9,506		10,356

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Earnings Per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 19 - EARNINGS PER SHARE

The following is a reconciliation of net income and shares outstanding to the income and number of shares used to compute earnings per share (“EPS”):

	Three months ended
	March 31,
	2019					2018
(dollars in thousands except per share amounts)	Income		Shares			Income		Shares
Net income as reported	$	10,380				$	8,847
Shares outstanding				20,073,991					16,288,928
Impact of weighting shares				(26,275	)				(206,033	)
Used in basic EPS		10,380		20,047,716			8,847		16,082,895
Dilutive effect of outstanding
Stock options				389,025					1,079,425
Used in dilutive EPS	$	10,380		20,436,741		$	8,847		17,162,320

Basic earnings per common share	$	0.52				$	0.55
Diluted earnings per common share		0.51					0.52

Revenue From Contracts With Customers

3 Months Ended

Mar. 31, 2019

Revenue From Contract With Customer [Abstract]

Revenue From Contracts With Customers

NOTE 20 – REVENUE FROM CONTRACTS WITH CUSTOMERS

On January 1, 2019, the Company adopted ASU 2014-09, Revenue from Contracts with Customers - Topic 606 and all subsequent ASUs that modified ASC 606. The Company adopted ASC 606 using the modified retrospective method applied to those contracts that were not completed as of January 1, 2019. The new standard did not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s existing accounting for contracts within the scope of the new standard. There was no cumulative effect adjustment to retained earnings as a result of adopting this new standard.

The following is a summary of revenue from contracts with customers that are in-scope and not in-scope under Topic 606:

	Three months Ended March 31,
(dollars in thousands)	2019		2018
Non-interest income, in scope (1)
Fees and service charges on deposit accounts	$	298	$	288
Other fees (2)		198		6
Other income (3)		291		127
Gain (loss) on sale of OREO		—		—
Total in-scope non-interest income		787		421
Non-interest income, not in scope (4)		3,415		2,034
Total non-interest income	$	4,202	$	2,455

(1)

There were no adjustments to the Company's financial statements recorded as a result of the adoption of ASC 606.

(2)

Other fees consists of wealth management fees, miscellaneous loan fees, , and postage/courier fees.

(3)

Other income consists of safe deposit box rental income, wire transfer fees, security brokerage fees, annuity sales, insurance activity, and OREO income.

(4)

The amounts primarily represent revenue from contracts with customers that are out of scope of ASC606: Net loan servicing income, letter of credit commissions, import/export commissions, recoveries on purchased loans, BOLI income, and gains (losses) on sales of mortgage loans, loans and investment securities.

The major revenue streams by fee type that are within the scope of ASC 606 presented in the above tables are described in additional detail below:

Fees and Services Charges on Deposit Accounts

Fees and service charges on deposit accounts include charges for analysis, overdraft, cash checking, ATM, and safe deposit activities executed by our deposit clients, as well as interchange income earned through card payment networks for the acceptance of card based transactions. Fees earned from our deposit clients are governed by contracts that provide for overall custody and access to deposited funds and other related services, and can be terminated at will by either party; this includes fees from money service businesses (MSBs). Fees received from deposit clients for the various deposit activities are recognized as revenue once the performance obligations are met. The adoption of ASU 2014-09 had no impact to the recognition of fees and service charges on deposit accounts.

Wealth Management Fees

The Company employs financial consultants to provide investment planning services for customers including wealth management services, asset allocation strategies, portfolio analysis and monitoring, investment strategies, and risk management strategies. The fees the Company earns are variable and are generally received monthly. The Company recognizes revenue for the services performed at quarter-end based on actual transaction details received from the broker dealer the Company engages.

In the Company’s wealth management division, revenue is primarily generated from (1) securities brokerage accounts, (2) investment advisor accounts, and (3) full service brokerage implementation fees, and (4) life insurance and annuity products.

Gain on Sales of Other Real Estate Owned

The Company records a gain or loss from the sale of other real estate owned (“OREO”) when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When the Company finances the sale of OREO to a buyer, the Company assesses whether the buyer is committed to perform their obligations under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Company adjusts the transaction price and related gain or loss on sale if a significant financing component is present.

Qualified Affordable Housing Project Investments

3 Months Ended

Mar. 31, 2019

Text Block [Abstract]

Qualified Affordable Housing Project Investments

NOTE 21 - QUALIFIED AFFORDABLE HOUSING PROJECT INVESTMENTS

The Company began investing in qualified housing projects in 2016. At March 31, 2019 and December 31, 2018, the balance of the investment for qualified affordable housing projects was $9.3 million and $9.5 million, respectively. This balance is reflected in the accrued interest and other assets line on the consolidated balance sheets. Total unfunded commitments related to the investments in qualified housing projects totaled $6.2 million and $6.8 million at March 31, 2019 and December 31, 2018, respectively. The Company expects to fulfill these commitments during the years ending 2027 and 2028.

For the three months ended March 31, 2019 and 2018, the Company recognized amortization expense of $225,000 and $139,000, respectively, which was included within income tax expense on the consolidated statements of income.

Recent Developments

3 Months Ended

Mar. 31, 2019

Recent Developments [Abstract]

Recent Developments

NOTE 22 - RECENT DEVELOPMENTS

On April 17, 2019, RBB Bancorp declared a cash dividend of $0.10 per share for the second quarter of 2019. The dividend is payable on May 15, 2019 to common shareholders of record as of May 2, 2019.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements and notes thereto of the Company have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) for Form 10-Q and conform to practices within the banking industry and include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for interim financial reporting. The accompanying unaudited consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments), which are necessary for a fair presentation of financial results for the interim periods presented. The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results for the full year. These interim unaudited financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto as of and for the year ended December 31, 2018, included in our Annual Report filed on Form 10-K for the fiscal year ended December 31, 2018 (our “2018 Annual Report”).
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The accompanying unaudited consolidated financial statements were compiled in accordance with the accounting policies set forth in Note 1 – Summary of Significant Policies in our Consolidated Financial Statements as of and for the year ended December 31, 2018, included in our 2018 Annual Report. The accompanying consolidated unaudited financial statements reflect all adjustments consisting of normal recurring adjustments that, in the opinion of management, are necessary to reflect a fair statement of our consolidated financial condition, results of operations, and cash flows. The results of operations for acquired companies are included from the dates of acquisition. Operating results for the three months ended March 31, 2019 are not necessarily indicative of the results that may be expected for the year ended December 31, 2019.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU" or “Update”) 2014-09, Revenue from Contracts with Customers (Topic 606). This Update requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. The following steps are applied in the updated guidance: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the entity satisfies a performance obligation. These amendments are effective for public business entities for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Our revenue is primarily comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income. Accordingly, the majority of the Company’s revenues will not be affected. In addition, the standard does not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s existing accounting for contracts within the scope of the standard. As an emerging growth company, the Company adopted ASU 2014-09 as of January 1, 2019, utilizing the modified prospective approach. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements, as substantially all of the Company’s revenues are excluded from the scope of the new standard. Since there was no net income impact upon adoption of this ASU, a cumulative effect adjustment to opening retained earnings was not deemed necessary. See Note 20 (Revenue from Contracts with Customers) for more information. In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10). Changes made to the current measurement model primarily affect the accounting for equity securities and readily determinable fair values, where changes in fair value will impact earnings instead of other comprehensive income. The accounting for other financial instruments, such as loans, investments in debt securities, and financial liabilities is largely unchanged. Investments in Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank (“FRB”) stock issued to member financial institutions are not subject to this guidance. Instead, FHLB and FRB stock would continue to be accounted for at cost less impairment under ASC 942-325-35-3. The ASU’s impairment guidance on equity investments for which fair value is not readily determinable also does not apply to FHLB or FRB stock. This Update also changes the presentation and disclosure requirements for financial instruments including a requirement that public business entities use exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes. This Update is generally effective for public business entities in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years and one year later for nonpublic business entities. The Company adopted this ASU as of January 1, 2019 and it did not have a material impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The most significant change for lessees is the requirement under the new guidance to recognize right-of-use assets and lease liabilities for all leases not considered short-term leases, which is generally defined as a lease term of less than 12 months. This change will result in lessees recognizing right-of-use assets and lease liabilities for most leases currently accounted for as operating leases under current lease accounting guidance. The amendments in this Update are effective for interim and annual periods beginning after December 15, 2019, for an emerging growth company. The Company has several lease agreements which are currently considered operating leases and are therefore not included on the Company’s Consolidated Balance Sheets. Under the new guidance the Company expects that some of the lease agreements will have to be recognized on the Consolidated Balance Sheets as a right-of-use asset with a corresponding lease liability. Based upon a preliminary evaluation the Company expects that the ASU will have an impact on the Company’s Consolidated Balance Sheets. The Company will continue to evaluate how extensive the impact will be under the ASU on the Company’s consolidated financial statements. The Company anticipates adopting this ASU 2016-02 beginning January 1, 2020. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instrument (Topic 326). This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that aren't measured at fair value through net income. The standard will replace today's "incurred loss" approach with an "expected loss" model. The new model, referred to as the current expected credit loss ("CECL") model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held to maturity securities, loan commitments, and financial guarantees. For available for sale (“AFS”) debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. ASU 2016-13 also expands the disclosure requirements regarding an entity's assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, public business entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU 2016-13 is effective for interim and annual reporting periods for an emerging growth company beginning after December 15, 2020. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company has begun its evaluation of the impact of the implementation of ASU 2016-13. The implementation of the provisions of ASU 2016-13 will most likely impact the Company’s consolidated financial statements as to the level of reserves that will be required for credit losses. The Company will continue to assess the potential impact that this Update will have on the Company’s consolidated financial statements. The Company anticipates adopting this ASU 2016-13 beginning January 1, 2021. In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350). This Update simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The amendments in this Update are required for public business entities and other entities that have goodwill reported in their financial statements and have not elected the private company alternative for the subsequent measurement of goodwill. As a result, under this Update, “an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit.” ASU 2017-14 is effective for annual and any interim impairment tests performed in periods beginning after December 15, 2021 for an emerging growth company. Adoption of ASU 2017-04 is not expected to have a significant impact on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities, which is intended to enhance “the accounting for the amortization of premiums for purchased callable debt securities.” This Update shortens the amortization period for certain callable debt securities purchased at a premium by requiring that the premium be amortized to the earliest call date. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments in this Update affects all entities that hold investments in callable debt securities that have an amortized cost basis in excess of the amount that is repayable by the issuer at the earliest call date (that is, at a premium). The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The ASU’s amendments are effective for emerging growth companies for interim and annual periods beginning after December 15, 2019. An entity should apply the amendments in this Update on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Additionally, in the period of adoption, an entity should provide disclosures about a change in accounting principle. The implementation of the provisions of ASU 2017-08 will most likely not have a material impact the Company’s consolidated financial statements. The Company will continue to assess the potential impact that this ASU will have on the Company’s consolidated financial statements. In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting. The amendments in ASU 2017-09 provide guidance about which changes to the terms or conditions of a share- entity to apply modification accounting. An entity should account for the effects of a modification unless all the following are met: (1) The fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification. (2) The vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified. (3) The classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified. The amendments in ASU 2017-09 are effective for annual periods, and interim within those annual reporting periods, for an emerging growth company, beginning after December 15, 2018. The amendments in this ASU should be applied prospectively to an award modified on or after the adoption date. This ASU did not have a material impact on the Company’s consolidated financial statements. In June 2018, the FASB issued ASU 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. The amendments in this Update expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. An entity should apply the requirements of Topic 718 to nonemployee awards except for specific guidance on inputs to an option pricing model and the attribution of cost (that is, the period of time over which share-based payment awards vest and the pattern of cost recognition over that period). The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The amendments also clarify that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. For emerging growth companies, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. This Update has the potential to only impact share-based payments to members of the Company’s board of directors. The Company will assess the potential impact that this ASU will have on the Company’s consolidated financial statements. In June 2018, the FASB issued ASU 2018-09, Codification Improvements, which affects a wide variety of topics, including amendments to subtopics: 220-10, Income Statement—Reporting Comprehensive Income—Overall; 470-50, Debt—Modifications and Extinguishments; 480-10, Distinguishing Liabilities from Equity—Overall; 718-740, Compensation—Stock Compensation—Income Taxes; 805-740, Business Combinations—Income Taxes; and, 820-10, Fair Value Measurement—Overall. The transition and effective date guidance is based on the facts and circumstances of each amendment. Some of the amendments in ASU 2018-09 do not require transition guidance and will be effective upon issuance of ASU 2018-09. However, many of the amendments do have transition guidance with effective dates for annual periods beginning after December 15, 2018, for public business entities and after December 15, 2019 for emerging growth companies. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for fair Value Measurement. The amendments in this Update modify the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the concepts in the Concepts Statement, including the consideration of costs and benefits. These disclosure requirements were removed from the topic: (1) The amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, (2) the policy for timing of transfers between levels, and (3) the valuation processes for Level 3 fair value measurements. These disclosure requirements were modified: (1) For investments in certain entities that calculate net asset value, an entity is required to disclose the timing of liquidation of an investee’s assets and the date when restrictions from redemption might lapse only if the investee has communicated the timing to the entity or announced the timing publicly, and (2) the amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. The following disclosure requirements were added: (1) The changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, (2) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. For certain unobservable inputs, an entity may disclose other quantitative information (such as the median or arithmetic average) in lieu of the weighted average if the entity determines that other quantitative information would be a more reasonable and rational method to reflect the distribution of unobservable inputs used to develop Level 3 fair value measurements. In addition, the amendments eliminate “at a minimum” from the phrase “an entity shall disclose at a minimum to promote the appropriate exercise of discretion by entities when considering fair value measurement disclosures and to clarify that materiality is an appropriate consideration of entities and their auditors when evaluating disclosure requirements”. The amendments in this Update are effective for emerging growth companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted upon issuance of this Update. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this Update and delay adoption of the additional disclosures until their effective date. As an emerging growth company, RBB will adopt this Update on January 1, 2021. In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This Update provides additional guidance to ASU 2015-05, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement” (CCA), on the accounting for implementation, setup, and other upfront costs (collectively referred to as implementation costs) apply to entities that are a customer in a hosting arrangement. This Update applies to entities that are a customer in a hosting arrangement that is a service contract. Costs for implementation activities in the application development stage are capitalized depending on the nature of the costs, while costs incurred during the preliminary project and post-implementation stages are expensed as the activities are performed. This Update also require the customer to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. This Update is effective for an emerging growth company for annual reporting periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021. Early adoption of the amendments in this Update is permitted, including adoption in any interim period, for all entities. The amendments in this Update should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. This Update could be material should RBB incur implementation costs for a CCA that is a service contract.

Acquisition (Tables)

3 Months Ended

Mar. 31, 2019

First American International Corp.

Schedule of Assets Acquired and Liabilities Assumed and Fair Value Adjustments

	FAIC			Fair Value			Fair
(dollars in thousands)	Book Value			Adjustments			Value
Assets acquired
Cash and cash equivalents	$	55,891		$	—		$	55,891
Fed funds sold		218			—			218
Interest-bearing deposits in other financial Institutions		3,801			—			3,801
Investments - held to maturity		30,814			(611	)		30,203
Investments - available for sale		14,388			—			14,388
Mortgage loans held for sale		1,915			—			1,915
Loans, gross		721,732			(6,161	)		715,571
Allowance for loan losses		(9,583	)		9,583			—
Bank premises and equipment		5,785			3,439			9,224
Mortgage servicing rights		11,274			(660	)		10,614
Core deposit premium		—			6,738			6,738
Other assets		3,518			(2,119	)		1,399
Total assets acquired	$	839,753		$	10,209		$	849,962
Liabilities assumed
Deposits	$	629,609		$	94		$	629,703
FHLB advances		124,500			—			124,500
Subordinated debentures		7,217			(1,241	)		5,976
Other liabilities		14,940			(1,153	)		13,787
Total liabilities assumed		776,266			(2,300	)		773,966
Excess of assets acquired over liabilities assumed		63,487			12,509			75,996
	$	839,753		$	10,209
Stock consideration								69,602
Cash paid								34,837
Goodwill recognized							$	28,443

Investment Securities (Tables)

3 Months Ended

Mar. 31, 2019

Investments Debt And Equity Securities [Abstract]

Summary of Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities

			Gross		Gross
(dollars in thousands)	Amortized		Unrealized		Unrealized			Fair
March 31, 2019	Cost		Gains		Losses			Value
Available for sale
Government agency securities	$	1,751	$	—	$	(52	)	$	1,699
SBA agency securities		5,221		—		(102	)		5,119
Mortgage-backed securities- Government sponsored agencies		22,425		17		(296	)		22,146
Collateralized mortgage obligations		12,415		—		(434	)		11,981
Corporate debt securities		17,668		59		(135	)		17,592
Total	$	59,480	$	76	$	(1,019	)	$	58,537

Held to maturity
Municipal taxable securities	$	3,789	$	155	$	—		$	3,944
Municipal securities		5,660		16		(21	)		5,655
Total	$	9,449	$	171	$	(21	)	$	9,599

December 31, 2018
Available for sale
Government agency securities	$	1,873	$	—	$	(58	)	$	1,815
SBA agency securities		5,354		—		(185	)		5,169
Mortgage-backed securities- Government sponsored agencies		23,125		1		(585	)		22,541
Collateralized mortgage obligations		12,696		1		(631	)		12,066
Corporate debt securities		32,615		105		(549	)		32,171
Total	$	75,663	$	107	$	(2,008	)	$	73,762

Held to maturity
Municipal taxable securities	$	4,290	$	142	$	—		$	4,432
Municipal securities		5,671		1		(164	)		5,508
Total	$	9,961	$	143	$	(164	)	$	9,940

Amortized Cost and Fair Value of Investment Securities Portfolio Expected Maturity

	Less than One Year				More than One Year to Five Years				More than Five Years to Ten Years				More than Ten Years				Total
	Amortized		Estimated		Amortized		Estimated		Amortized		Estimated		Amortized		Estimated		Amortized		Estimated
(dollars in thousands)	Cost		Fair Value		Cost		Fair Value		Cost		Fair Value		Cost		Fair Value		Cost		Fair Value
March 31, 2019
Government agency securities	$	—	$	—	$	829	$	803	$	922	$	896	$	—	$	—	$	1,751	$	1,699
SBA securities		—		—		808		802		4,413		4,317		—		—		5,221		5,119
Mortgage-backed securities- Government sponsored agencies		1,637		1,631		11,967		11,847		8,821		8,668		—		—		22,425		22,146
Collateralized mortgage obligations		—		—		9,318		8,937		3,097		3,044		—		—		12,415		11,981
Corporate debt securities		2,048		2,043		5,096		5,056		6,499		6,545		4,025		3,948		17,668		17,592
Total available for sale	$	3,685	$	3,674	$	28,018	$	27,445	$	23,752	$	23,470	$	4,025	$	3,948	$	59,480	$	58,537

Municipal taxable securities	$	—	$	—	$	3,284	$	3,372	$	505	$	572	$	—	$	—	$	3,789	$	3,944
Municipal securities		—		—		—		—		858		860		4,802		4,795		5,660		5,655
Total held to maturity	$	—	$	—	$	3,284	$	3,372	$	1,363	$	1,432	$	4,802	$	4,795	$	9,449	$	9,599

Summary of Investment Securities With Unrealized Losses

	Less than Twelve Months							Twelve Months or More							Total
(dollars in thousands)	Unrealized Losses			Estimated Fair Value		No. of Issuances		Unrealized Losses			Estimated Fair Value		No. of Issuances		Unrealized Losses			Estimated Fair Value		No. of Issuances
March 31, 2019
Government agency securities	$	—		$	—		—	$	(52	)	$	1,699		2	$	(52	)	$	1,699		2
SBA securities		—			—		—		—			—		—		—			—		—
Mortgage-backed securities- Government sponsored agencies		(1	)		253		1		(397	)		23,515		25		(398	)		23,768		26
Collateralized mortgage obligations		—			—		—		(434	)		11,981		8		(434	)		11,981		8
Corporate debt securities		(14	)		1,486		2		(121	)		11,047		7		(135	)		12,533		9
Total available for sale	$	(15	)	$	1,739		3	$	(1,004	)	$	48,242		42	$	(1,019	)	$	49,981		45

Municipal securities		—			—		—	$	(21	)	$	1,853		4	$	(21	)	$	1,853		4
Total held to maturity	$	—		$	—		—	$	(21	)	$	1,853		4	$	(21	)	$	1,853		4

December 31, 2018
Government agency securities	$	—		$	—		—	$	(58	)	$	1,815		2	$	(58	)	$	1,815		2
SBA securities		—			—		—		(185	)		5,169		4		(185	)		5,169		4
Mortgage-backed securities- Government sponsored agencies		(12	)		1,641		1		(573	)		20,602		22		(585	)		22,243		23
Collateralized mortgage obligations		—			—		—		(631	)		12,065		8		(631	)		12,065		8
Corporate debt securities		(61	)		4,600		4		(488	)		6,548		4		(549	)		11,148		8
Total available for sale	$	(73	)	$	6,241		5	$	(1,935	)	$	46,199		40	$	(2,008	)	$	52,440		45

Municipal securities	$	(104	)	$	2,468		6	$	(60	)	$	2,174		4	$	(164	)	$	4,642		10
Total held to maturity	$	(104	)	$	2,468		6	$	(60	)	$	2,174		4	$	(164	)	$	4,642		10

Loans and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Summary of Balance and Activity Related to Allowance for Loan Losses for Held for Investment Loans and the Recorded Investments in Loans and Impairment method by Portfolio Segment

The following tables present the balance and activity related to the allowance for loan losses for held for investment loans by type for the periods presented.

	Three months ended March 31,
	2019									2018
(dollars in thousands)	Real Estate		Commercial			Other		Total		Real Estate		Commercial			Unallocated			Other		Total
Allowance for loan losses:
Beginning balance	$	13,437	$	4,140		$	—	$	17,577	$	9,309	$	4,044		$	420		$	—	$	13,773
Additions (reductions) to the allowance charged to expense		952		(405	)		3		550		653		(118	)		(351	)		—		184
Recoveries on loans charged-off		—		109			—		109		—		—			—			—		—
Less loans charged-off		—		—			—		—		—		—			—			—		—
Ending balance	$	14,389	$	3,844		$	3	$	18,236	$	9,962	$	3,926		$	69		$	—	$	13,957

(dollars in thousands)
As of and for the three months ended March 31, 2019	Real Estate		Commercial		Other		Total
Reserves:
Specific	$	—	$	11	$	—	$	11
General		14,389		3,833		3		18,225
Total allowance for loan losses	$	14,389	$	3,844	$	3	$	18,236
Loans evaluated for impairment:
Individually		2,365		221		—		2,586
Collectively		1,765,585		351,906		336		2,117,827
Total loans, net of deferred loan fees and unaccreted discount on acquired loans	$	1,767,950	$	352,127	$	336	$	2,120,413

As of and for the three months ended March 31, 2018	Real Estate		Commercial		Unallocated		Total
Reserves:
Specific	$	—	$	—	$	—	$	—
General		9,962		3,926		69		13,957
Total allowance for loan losses	$	9,962	$	3,926	$	69	$	13,957
Loans evaluated for impairment:
Individually	$	2,393	$	2,072	$	—	$	4,465
Collectively		866,176		390,974		—		1,257,150
Loans acquired with deteriorated credit quality		313		—		—		313
Total loans, net of deferred loan fees and unaccreted discount on acquired loans	$	868,882	$	393,046	$	—	$	1,261,928

As of and for the year ended December 31, 2018	Real Estate		Commercial			Unallocated			Total
Allowance for loan losses:
Beginning of year	$	9,309	$	4,044		$	420		$	13,773
Provisions		4,128		761			(420	)		4,469
Charge-offs		—		(701	)		—			(701	)
Recoveries		—		36			—			36
	$	13,437	$	4,140		$	—		$	17,577
Reserves:
Specific	$	—	$	44		$	—		$	44
General		13,393		4,140			—			17,533
Loans acquired with deteriorated credit quality		—		—			—			—
Total allowance for loan losses	$	13,393	$	4,184		$	—		$	17,577
Loans evaluated for impairment:
Individually	$	2,309	$	972		$	—		$	3,281
Collectively		1,750,896		387,838			—			2,138,734
Total loans, net of deferred loan fees and unaccreted discount on acquired loans	$	1,753,205	$	388,810		$	—		$	2,142,015

Summary of Risk Category of Loans by Class of Loans

The risk category of loans by class of loans was as follows at March 31, 2019 and December 31, 2018:

(dollars in thousands)			Special
March 31, 2019	Pass		Mention		Substandard		Impaired		Total
Real estate:
Construction and land development	$	125,412	$	—	$	—	$	274	$	125,686
Commercial real estate		727,546		6,333		20,343		2,091		756,313
Single-family residential mortgages		884,780		—		1,171		—		885,951
Commercial:
Other		256,674		7,749		5,133		—		269,556
SBA		77,241		135		4,974		221		82,571
Other:		336		—		—		—		336
Total loans	$	2,071,989	$	14,217	$	31,621	$	2,586	$	2,120,413

(dollars in thousands)			Special
December 31, 2018	Pass		Mention		Substandard		Impaired		Total
Real estate:
Construction and land development	$	112,959	$	—	$	—	$	276	$	113,235
Commercial real estate		743,123		7,069		6,496		2,033		758,721
Single-family residential mortgages		880,860		—		389		—		881,249
Commercial:
Other		295,226		6,286		2,798		—		304,310
SBA		79,057		—		4,471		972		84,500
Total loans	$	2,111,225	$	13,355	$	14,154	$	3,281	$	2,142,015

Summary of Aging Recorded Investment Past-due Loans

The following table presents the aging of the recorded investment in past-due loans at March 31, 2019 and December 31, 2018 by class of loans:

(dollars in thousands)	30-59		60-89		90 Days		Total		Loans Not		Total		Non-Accrual
March 31, 2019	Days		Days		Or More		Past Due		Past Due		Loans		Loans ⁽¹⁾
Real estate:
Construction and land development	$	—	$	—	$	—	$	—	$	125,686	$	125,686	$	—
Commercial real estate		386		—		—		386		755,927		756,313		—
Single-family residential mortgages		2,056		—		—		2,056		883,895		885,951		—
Commercial:
Other		690		—		—		690		268,866		269,556		—
SBA		2,026		—		166		2,192		80,379		82,571		166
Other:		—		—		—		—		336		336		—
	$	5,158	$	—	$	166	$	5,324	$	2,115,089	$	2,120,413	$	166
Real estate:
Single-family residential mortgages held for sale	$	507	$	—	$	—	$	507	$	374,923	$	375,430	$	—

December 31, 2018
Real estate:
Construction and land development	$	—	$	—	$	—	$	—	$	113,235	$	113,235	$	—
Commercial real estate		—		678		—		678		758,043		758,721		—
Single-family residential mortgages		1,548		950		—		2,498		878,751		881,249		—
Commercial:
Other		—		—		—		—		304,310		304,310		—
SBA		957		—		914		1,871		82,629		84,500		914
	$	2,505	$	1,628	$	914	$	5,047	$	2,136,968	$	2,142,015	$	914
Real estate:
Single-family residential mortgages held for sale	$	—	$	458	$	—	$	458	$	434,064	$	434,522	$	—

⁽¹⁾

Included in total loans.

Summary of Individually Impaired Loans Presented by Class of Loans

Information relating to individually impaired loans presented by class of loans was as follows at March 31, 2019 and December 31, 2018:

(dollars in thousands)	Principal		Recorded		Average		Interest		Related
March 31, 2019	Balance		Investment		Balance		Income		Allowance
With no related allowance recorded
Construction and land development	$	275	$	275	$	275	$	6	$	—
Commercial real estate		2,090		2,090		2,100		17		—
Residential mortgage loans		—		—		—		—		—
Commercial - SBA		55		55		56		1		—

With related allowance recorded
Commercial - SBA		166		166		166		—		11
Total	$	2,586	$	2,586	$	2,597	$	24	$	11

(dollars in thousands)	Principal		Recorded		Average		Interest		Related
December 31, 2018	Balance		Investment		Balance		Income		Allowance
With no related allowance recorded
Construction and land development	$	276	$	276	$	283	$	23	$	—
Commercial real estate		2,033		2,033		2,126		134		—
Residential mortgage loans		—		—		—		—		—
Commercial - SBA		797		1,498		1,377		19		—

With related allowance recorded
Commercial - SBA		175		175		193		1		44
Total	$	3,281	$	3,982	$	3,979	$	177	$	44

Loan Servicing (Tables)

3 Months Ended

Mar. 31, 2019

Loan Servicing [Abstract]

Schedule of Principal Balances of Mortgage and SBA Loans Serviced for Others

Mortgage and SBA loans serviced for others are not reported as assets. The principal balances at March 31, 2019 and December 31, 2018 are as follows:

	March 31,		December 31,
(dollars in thousands)	2019		2018
Loans serviced for others:
Mortgage loans	$	1,654,411	$	1,586,499
SBA loans	$	181,627	$	184,664
Commercial real estate loans	$	4,267	$	2,838

Schedule of Amortization of Mortgage Servicing Rights Netted Against Loan Servicing Fee Income

The amortization of mortgage servicing rights is netted against loan servicing fee income.

	Three months ended						Three months ended
	March 31, 2019						March 31, 2018
	Mortgage			SBA			Mortgage			SBA
(dollars in thousands)	Loans			Loans			Loans			Loans
Servicing assets:
Beginning of year	$	12,858		$	4,512		$	1,540		$	4,417
Additions		604			112			315			484
Disposals		(33	)		(127	)		(39	)		(425	)
Amortized to expense		(466	)		(172	)		(155	)		(158	)
End of period	$	12,963		$	4,325		$	1,661		$	4,318

Goodwill and Intangibles (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Future Estimated Amortization Expense

Estimated CDI amortization expense for future years is as follows:

(dollars in thousands)
As of March 31:
Remainder of 2019	$	1,112
2020		1,284
2021		1,056
2022		879
2023		749
Thereafter		2,132
Total	$	7,212

Deposits (Tables)

3 Months Ended

Mar. 31, 2019

Maturities Of Time Deposits [Abstract]

Schedule of Maturities of Time Deposits

At March 31, 2019, the scheduled maturities of time deposits are as follows:

(dollars in thousands)	March 31, 2019
One year	$	1,143,844
Two to three years		137,650
Over three years		2,934
Total	$	1,284,428

Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt

At March 31, 2019 and December 31, 2018, long-term debt was as follows:

	March 31,		December 31,
(dollars in thousands)	2019		2018
Principal	$	105,000	$	105,000
Unamortized debt issuance costs	$	1,207	$	1,292

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Commitments (Tables)

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rent Payments on Company's Leases

Future minimum rent payments on the Company’s leases were as follows at March 31, 2019:

(dollars in thousands)
Year ending December 31:
2019 remaining	$	4,212
2020		5,081
2021		3,639
2022		3,470
2023		2,936
Thereafter		9,150
Total	$	28,488

Schedule of Financial Commitments whose Contractual Amount Represents Credit Risk

At March 31, 2019 and December 31, 2018, the Company had the following financial commitments whose contractual amount represents credit risk:

	March 31,		December 31,
(dollars in thousands)	2019		2018
Commitments to extend credit	$	250,579	$	267,920
Commercial and similar letters of credit		1,179		1,042
Standby letters of credit		3,674		3,374
Total	$	255,432	$	272,336

Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2019

Schedule of Related Party Transactions

Loans to principal officers, directors, and their affiliates were as follows:

	March 31,			December 31,
(dollars in thousands)	2019			2018
Beginning balance	$	3,600		$	2,300
New loans and advances		3,600			7,400
Repayments		(3,600	)		(6,100	)
Ending balance	$	3,600		$	3,600

Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2019

Regulated Operations [Abstract]

Summary of Company and Bank Continue to Exceed Regulatory Capital Minimum Requirements and Bank Continues to Exceed Well Capitalized Standards

						Amount of Capital Required
											To Be Well-Capitalized
						Minimum Required for					Under Prompt Corrective
	Actual					Capital Adequacy Purposes					Provisions
(dollars in thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of March 31, 2019:
Tier 1 Leverage Ratio
Consolidated	$	331,144		11.61	%	NA		NA			NA		NA
Bank		382,681		13.43	%		113,970		4.0	%		142,462		5.0	%
Common Equity Tier 1 Risk- Based Capital Ratio
Consolidated		321,596		16.29	%	NA		NA			NA		NA
Bank		382,681		19.39	%		88,669		4.5	%		128,078		6.5	%
Tier 1 Risk-Based Capital Ratio
Consolidated		331,144		16.77	%	NA		NA			NA		NA
Bank		382,681		19.39	%		118,225		6.0	%		157,634		8.0	%
Total Risk-Based Capital Ratio
Consolidated		453,811		22.98	%	NA		NA			NA		NA
Bank		401,555		20.35	%		157,634		8.0	%		197,042		10.0	%

						Amount of Capital Required
											To Be Well-Capitalized
						Minimum Required for					Under Prompt Corrective
	Actual					Capital Adequacy Purposes					Provisions
(dollars in thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2018:
Tier 1 Leverage Ratio
Consolidated	$	321,407		11.80	%	NA		NA			NA		NA
Bank		370,304		13.66	%		108,445		4.0	%		135,556		5.0	%
Common Equity Tier 1 Risk- Based Capital Ratio
Consolidated		311,901		15.28	%	NA		NA			NA		NA
Bank		370,304		18.17	%		91,722		4.5	%		132,487		6.5	%
Tier 1 Risk-Based Capital Ratio
Consolidated		321,407		15.74	%	NA		NA			NA		NA
Bank		370,304		18.17	%		122,296		6.0	%		163,061		8.0	%
Total Risk-Based Capital Ratio
Consolidated		443,379		21.71	%	NA		NA			NA		NA
Bank		388,569		19.07	%		163,061		8.0	%		203,826		10.0	%

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Hierarchy and Fair Value for Each Major Category of Assets and Liabilities Measured at Fair Value

The following table provides the hierarchy and fair value for each major category of assets and liabilities measured at fair value at March 31, 2019 and December 31, 2018:

(dollars in thousands)	Fair Value Measurements Using:
March 31, 2019	Level 1		Level 2		Level 3		Total
Assets measured at fair value:
On a recurring basis:
Securities available for sale
Government agency securities			$	1,699			$	1,699
SBA agency securities				5,119				5,119
Mortgage-backed securities				22,146				22,146
Collateralized mortgage obligations				11,981				11,981
Corporate debt securities				17,592				17,592
	$	—	$	58,537	$	—	$	58,537

On a non-recurring basis:
Other real estate owned	$	—	$	—	$	2,056	$	2,056

December 31, 2018
Assets measured at fair value:
On a recurring basis:
Securities available for sale
Government agency securities			$	1,815				1,815
SBA agency securities				5,169				5,169
Mortgage-backed securities				22,541				22,541
Collateralized mortgage obligations				12,066				12,066
Corporate debt securities				32,171				32,171
	$	—	$	73,762	$	—	$	73,762

On a non-recurring basis:
Other real estate owned	$	—	$	—	$	1,101	$	1,101

Summary of Quantitative Information About OREO Non-recurring Level 3 Fair Value Measurements

Quantitative information about the Company's OREO non-recurring Level 3 fair value measurements at March 31, 2019 and December 31, 2018 is as follows:

Weighted-

(dollars in thousands)

Fair Value

Valuation

Unobservable

Adjustment

Average

March 31, 2019

Amount

Technique

Input

Range

Adjustment

Other real estate owned

2,056

Third Party

Management Adjustments

15%

Appraisals

to Reflect Current

Conditions and Selling

Costs

December 31, 2018

Other real estate owned

1,101

Third Party

Management Adjustments

16%

Appraisals

to Reflect Current

Conditions and Selling

Costs

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value Hierarchy Level and Estimated Fair Value of Significant Financial Instruments

The fair value hierarchy level and estimated fair value of significant financial instruments at March 31, 2019 and December 31, 2018 are summarized as follows:

		March 31,				December 31,
		2019				2018
	Fair Value	Carrying		Fair		Carrying		Fair
(dollars in thousands)	Hierarchy	Value		Value		Value		Value
Financial Assets:
Cash and due from banks	Level 1	$	250,079	$	250,079	$	147,685	$	147,685
Interest-earning deposits in other financial institutions	Level 1		1,196		1,196		600		600
Investment securities - AFS	Level 2		58,537		58,537		73,762		73,762
Investment securities - HTM	Level 2		9,449		9,599		9,961		9,940
Mortgage loans held for sale	Level 1		375,430		379,289		434,522		438,948
Loans, net	Level 3		2,102,177		2,131,065		2,124,438		2,114,341
Equity Security	Level 3		10,250		10,250		10,039		10,039

Financial Liabilities:
Deposits	Level 2	$	2,184,340	$	2,178,281	$	2,144,041	$	2,143,196
FHLB advances	Level 2		275,000		275,000		319,500		319,500
Long-term debt	Level 2		103,793		100,296		103,708		98,509
Subordinated debentures	Level 3		9,548		10,760		9,506		10,356

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Reconciliation of Net Income and Shares Outstanding to Income and Number of Shares Used to Compute EPS

The following is a reconciliation of net income and shares outstanding to the income and number of shares used to compute earnings per share (“EPS”):

	Three months ended
	March 31,
	2019					2018
(dollars in thousands except per share amounts)	Income		Shares			Income		Shares
Net income as reported	$	10,380				$	8,847
Shares outstanding				20,073,991					16,288,928
Impact of weighting shares				(26,275	)				(206,033	)
Used in basic EPS		10,380		20,047,716			8,847		16,082,895
Dilutive effect of outstanding
Stock options				389,025					1,079,425
Used in dilutive EPS	$	10,380		20,436,741		$	8,847		17,162,320

Basic earnings per common share	$	0.52				$	0.55
Diluted earnings per common share		0.51					0.52

Revenue From Contracts With Customers (Tables)

3 Months Ended

Mar. 31, 2019

Revenue From Contract With Customer [Abstract]

Summary of Revenue From Contracts With Customers in-Scope and Not in-Scope under Topic 606

The following is a summary of revenue from contracts with customers that are in-scope and not in-scope under Topic 606:

	Three months Ended March 31,
(dollars in thousands)	2019		2018
Non-interest income, in scope (1)
Fees and service charges on deposit accounts	$	298	$	288
Other fees (2)		198		6
Other income (3)		291		127
Gain (loss) on sale of OREO		—		—
Total in-scope non-interest income		787		421
Non-interest income, not in scope (4)		3,415		2,034
Total non-interest income	$	4,202	$	2,455

(1)

There were no adjustments to the Company's financial statements recorded as a result of the adoption of ASC 606.

(2)

Other fees consists of wealth management fees, miscellaneous loan fees, , and postage/courier fees.

(3)

Other income consists of safe deposit box rental income, wire transfer fees, security brokerage fees, annuity sales, insurance activity, and OREO income.

(4)

Business Description - Additional Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended	87 Months Ended
	Jul. 31, 2017 $ / shares shares	Mar. 31, 2019 USD ($)	Oct. 15, 2018 Acquisition Branch	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Description Of Business [Line Items]
Total assets		$ 2,978,118		$ 2,974,002
Gross loans including HFI and HFS		2,100,000
Total deposits		2,184,340		2,144,041
Total stockholders' Equity		384,803		374,621	$ 275,822	$ 265,176
Number of acquisitions \| Acquisition			5
First American International Bank \| Queens
Description Of Business [Line Items]
Number of branches operated \| Branch			3
First American International Bank \| Manhattan
Description Of Business [Line Items]
Number of branches operated \| Branch			3
First American International Bank \| Brooklyn
Description Of Business [Line Items]
Number of branches operated \| Branch			2
Common Stock
Description Of Business [Line Items]
Total stockholders' Equity		$ 289,514		$ 288,610	$ 210,595	$ 205,927
Initial Public Offering \| Common Stock
Description Of Business [Line Items]
Issuance of common stock, net of issuance costs, shares \| shares	3,750,000
Share price per share \| $ / shares	$ 23.00

Acquisition - Additional Information (Details) $ in Thousands	Oct. 15, 2018 USD ($) Branch shares	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 58,383	$ 58,383
First American International Corp.
Business Acquisition [Line Items]
Cash consideration	$ 34,800
Business acquisition, stock value of acquirer	$ 69,600
Business acquisition, common shares issued \| shares	3,011,762
Goodwill	$ 28,400
First American International Corp. \| New York
Business Acquisition [Line Items]
Number of branches operated \| Branch	9

Acquisition - Schedule of Assets Acquired and Liabilities Assumed and Fair Value Adjustments (Details) - USD ($) $ in Thousands	Oct. 15, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill recognized		$ 58,383	$ 58,383
First American International Corp.
Business Acquisition [Line Items]
Stock consideration	$ 69,600
Cash paid	34,800
Goodwill recognized	28,400
First American International Corp. \| Book Value
Business Acquisition [Line Items]
Cash and cash equivalents	55,891
Fed funds sold	218
Interest-bearing deposits in other financial Institutions	3,801
Investments - held to maturity	30,814
Investments - available for sale	14,388
Mortgage loans held for sale	1,915
Loans, gross	721,732
Allowance for loan losses	(9,583)
Bank premises and equipment	5,785
Mortgage servicing rights	11,274
Other assets	3,518
Total assets acquired	839,753
Deposits	629,609
FHLB advances	124,500
Subordinated debentures	7,217
Other liabilities	14,940
Total liabilities assumed	776,266
Excess of assets acquired over liabilities assumed	63,487
Business combination, Recognized identifiable assets acquired and liabilities assumed, net	839,753
First American International Corp. \| Fair Value Adjustments
Business Acquisition [Line Items]
Investments - held to maturity	(611)
Loans, gross	(6,161)
Allowance for loan losses	9,583
Bank premises and equipment	3,439
Mortgage servicing rights	(660)
Core deposit premium	6,738
Other assets	(2,119)
Total assets acquired	10,209
Deposits	94
Subordinated debentures	(1,241)
Other liabilities	(1,153)
Total liabilities assumed	(2,300)
Excess of assets acquired over liabilities assumed	12,509
Business combination, Recognized identifiable assets acquired and liabilities assumed, net	10,209
First American International Corp. \| Fair Value
Business Acquisition [Line Items]
Cash and cash equivalents	55,891
Fed funds sold	218
Interest-bearing deposits in other financial Institutions	3,801
Investments - held to maturity	30,203
Investments - available for sale	14,388
Mortgage loans held for sale	1,915
Loans, gross	715,571
Bank premises and equipment	9,224
Mortgage servicing rights	10,614
Core deposit premium	6,738
Other assets	1,399
Total assets acquired	849,962
Deposits	629,703
FHLB advances	124,500
Subordinated debentures	5,976
Other liabilities	13,787
Total liabilities assumed	773,966
Excess of assets acquired over liabilities assumed	75,996
Stock consideration	69,602
Cash paid	34,837
Goodwill recognized	$ 28,443

Investment Securities - Summary of Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities - (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	$ 59,480	$ 75,663
Available for sale, Gross Unrealized Gains	76	107
Available for sale, Gross Unrealized Losses	(1,019)	(2,008)
Available for sale, Fair Value	58,537	73,762
Held to maturity, Amortized Cost	9,449	9,961
Held to maturity, Gross Unrealized Gains	171	143
Held to maturity, Gross Unrealized Losses	(21)	(164)
Securities held to maturity, fair value	9,599	9,940
Government Agency Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	1,751	1,873
Available for sale, Gross Unrealized Losses	(52)	(58)
Available for sale, Fair Value	1,699	1,815
SBA Agency Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	5,221	5,354
Available for sale, Gross Unrealized Losses	(102)	(185)
Available for sale, Fair Value	5,119	5,169
Mortgage-Backed Securities - Government Sponsored Agencies
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	22,425	23,125
Available for sale, Gross Unrealized Gains	17	1
Available for sale, Gross Unrealized Losses	(296)	(585)
Available for sale, Fair Value	22,146	22,541
Collateralized Mortgage Obligations
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	12,415	12,696
Available for sale, Gross Unrealized Gains		1
Available for sale, Gross Unrealized Losses	(434)	(631)
Available for sale, Fair Value	11,981	12,066
Corporate Debt Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	17,668	32,615
Available for sale, Gross Unrealized Gains	59	105
Available for sale, Gross Unrealized Losses	(135)	(549)
Available for sale, Fair Value	17,592	32,171
Municipal Taxable Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Held to maturity, Amortized Cost	3,789	4,290
Held to maturity, Gross Unrealized Gains	155	142
Securities held to maturity, fair value	3,944	4,432
Municipal Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Held to maturity, Amortized Cost	5,660	5,671
Held to maturity, Gross Unrealized Gains	16	1
Held to maturity, Gross Unrealized Losses	(21)	(164)
Securities held to maturity, fair value	$ 5,655	$ 5,508

Investment Securities - Additional Information (Details)	Mar. 31, 2019 USD ($) Security	Dec. 31, 2018 USD ($) Security
Investments Debt And Equity Securities [Abstract]
Number of investment securities pledged as collateral \| Security	1	1
Fair value of securities pledged to secure local agency deposit \| $	$ 692,000	$ 697,000

Investment Securities - Amortized Cost and Fair Value of Investment Securities Portfolio Expected Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Less than one year, Available for sale, Amortized Cost	$ 3,685
More than one year to five years, Available for sale, Amortized Cost	28,018
More than five years to ten years, Available for sale, Amortized Cost	23,752
More than ten years, Available for sale, Amortized Cost	4,025
Available for sale, Amortized Cost	59,480	$ 75,663
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year, Available for sale, Estimated Fair Value	3,674
More than one year, Available for sale, Estimated Fair Value	27,445
More than five years to ten years, Available for sale, Estimated Fair Value	23,470
More than ten years, Available for sale, Estimated Fair Value	3,948
Available for sale, Estimated Fair value	58,537	73,762
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
More than one year to five years, Held to Maturity, Amortized Cost	3,284
More than five years to ten years, Held to Maturity, Amortized Cost	1,363
More than ten years, Held to Maturity, Amortized Cost	4,802
Held to maturity, Amortized Cost	9,449	9,961
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
More than one year to five years, Held to Maturity, Estimated Fair Value	3,372
More than five years to ten years, Held to Maturity, Estimated Fair Value	1,432
More than ten years, Held to Maturity,Estimated Fair Value	4,795
Held to Maturity, Estimated Fair Value	9,599	9,940
Government Agency Securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
More than one year to five years, Available for sale, Amortized Cost	829
More than five years to ten years, Available for sale, Amortized Cost	922
Available for sale, Amortized Cost	1,751	1,873
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
More than one year, Available for sale, Estimated Fair Value	803
More than five years to ten years, Available for sale, Estimated Fair Value	896
Available for sale, Estimated Fair value	1,699	1,815
SBA Securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
More than one year to five years, Available for sale, Amortized Cost	808
More than five years to ten years, Available for sale, Amortized Cost	4,413
Available for sale, Amortized Cost	5,221	5,354
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
More than one year, Available for sale, Estimated Fair Value	802
More than five years to ten years, Available for sale, Estimated Fair Value	4,317
Available for sale, Estimated Fair value	5,119	5,169
Mortgage-Backed Securities - Government Sponsored Agencies
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Less than one year, Available for sale, Amortized Cost	1,637
More than one year to five years, Available for sale, Amortized Cost	11,967
More than five years to ten years, Available for sale, Amortized Cost	8,821
Available for sale, Amortized Cost	22,425	23,125
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year, Available for sale, Estimated Fair Value	1,631
More than one year, Available for sale, Estimated Fair Value	11,847
More than five years to ten years, Available for sale, Estimated Fair Value	8,668
Available for sale, Estimated Fair value	22,146	22,541
Collateralized Mortgage Obligations
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
More than one year to five years, Available for sale, Amortized Cost	9,318
More than five years to ten years, Available for sale, Amortized Cost	3,097
Available for sale, Amortized Cost	12,415	12,696
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
More than one year, Available for sale, Estimated Fair Value	8,937
More than five years to ten years, Available for sale, Estimated Fair Value	3,044
Available for sale, Estimated Fair value	11,981	12,066
Corporate Debt Securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Less than one year, Available for sale, Amortized Cost	2,048
More than one year to five years, Available for sale, Amortized Cost	5,096
More than five years to ten years, Available for sale, Amortized Cost	6,499
More than ten years, Available for sale, Amortized Cost	4,025
Available for sale, Amortized Cost	17,668	32,615
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year, Available for sale, Estimated Fair Value	2,043
More than one year, Available for sale, Estimated Fair Value	5,056
More than five years to ten years, Available for sale, Estimated Fair Value	6,545
More than ten years, Available for sale, Estimated Fair Value	3,948
Available for sale, Estimated Fair value	17,592	32,171
Municipal Taxable Securities
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
More than one year to five years, Held to Maturity, Amortized Cost	3,284
More than five years to ten years, Held to Maturity, Amortized Cost	505
Held to maturity, Amortized Cost	3,789	4,290
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
More than one year to five years, Held to Maturity, Estimated Fair Value	3,372
More than five years to ten years, Held to Maturity, Estimated Fair Value	572
Held to Maturity, Estimated Fair Value	3,944	4,432
Municipal Securities
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
More than five years to ten years, Held to Maturity, Amortized Cost	858
More than ten years, Held to Maturity, Amortized Cost	4,802
Held to maturity, Amortized Cost	5,660	5,671
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
More than five years to ten years, Held to Maturity, Estimated Fair Value	860
More than ten years, Held to Maturity,Estimated Fair Value	4,795
Held to Maturity, Estimated Fair Value	$ 5,655	$ 5,508

Investment Securities - Summary of Investment Securities With Unrealized Losses (Details) $ in Thousands	Mar. 31, 2019 USD ($) Security	Dec. 31, 2018 USD ($) Security
Schedule Of Available For Sale Securities [Line Items]
Less than Twelve Months Unrealized Losses	$ (15)	$ (73)
Less than Twelve Months Estimated Fair Value	$ 1,739	$ 6,241
Less than Twelve Months No. of Issuances \| Security	3	5
Twelve Months or More Unrealized Losses	$ (1,004)	$ (1,935)
Twelve Months or More Estimated Fair Value	$ 48,242	$ 46,199
Twelve Months or More No. of Issuances \| Security	42	40
Total Unrealized Losses	$ (1,019)	$ (2,008)
Total Estimated Fair Value	$ 49,981	$ 52,440
Available for sale, Total No. of Issuances \| Security	45	45
Held to maturity, Less than Twelve Months Unrealized Losses		$ (104)
Held to maturity, Less than Twelve Months Estimated Fair Value		$ 2,468
Held to maturity, Less than Twelve Months, No. of Issuances \| Security		6
Held to maturity, Twelve Months or More Unrealized Losses	$ (21)	$ (60)
Held to maturity, Twelve Months or More Estimated Fair Value	$ 1,853	$ 2,174
Held to maturity, Twelve Months or More, No. of Issuances \| Security	4	4
Held to maturity, Total Unrealized Losses	$ (21)	$ (164)
Held to maturity, Total Estimated Fair Value	$ 1,853	$ 4,642
Held to maturity, Total No. of Issuances \| Security	4	10
Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Twelve Months or More Unrealized Losses	$ (52)	$ (58)
Twelve Months or More Estimated Fair Value	$ 1,699	$ 1,815
Twelve Months or More No. of Issuances \| Security	2	2
Total Unrealized Losses	$ (52)	$ (58)
Total Estimated Fair Value	$ 1,699	$ 1,815
Available for sale, Total No. of Issuances \| Security	2	2
SBA Securities
Schedule Of Available For Sale Securities [Line Items]
Twelve Months or More Unrealized Losses		$ (185)
Twelve Months or More Estimated Fair Value		$ 5,169
Twelve Months or More No. of Issuances \| Security		4
Total Unrealized Losses		$ (185)
Total Estimated Fair Value		$ 5,169
Available for sale, Total No. of Issuances \| Security		4
Mortgage-Backed Securities - Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Less than Twelve Months Unrealized Losses	$ (1)	$ (12)
Less than Twelve Months Estimated Fair Value	$ 253	$ 1,641
Less than Twelve Months No. of Issuances \| Security	1	1
Twelve Months or More Unrealized Losses	$ (397)	$ (573)
Twelve Months or More Estimated Fair Value	$ 23,515	$ 20,602
Twelve Months or More No. of Issuances \| Security	25	22
Total Unrealized Losses	$ (398)	$ (585)
Total Estimated Fair Value	$ 23,768	$ 22,243
Available for sale, Total No. of Issuances \| Security	26	23
Collateralized Mortgage Obligations
Schedule Of Available For Sale Securities [Line Items]
Twelve Months or More Unrealized Losses	$ (434)	$ (631)
Twelve Months or More Estimated Fair Value	$ 11,981	$ 12,065
Twelve Months or More No. of Issuances \| Security	8	8
Total Unrealized Losses	$ (434)	$ (631)
Total Estimated Fair Value	$ 11,981	$ 12,065
Available for sale, Total No. of Issuances \| Security	8	8
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Less than Twelve Months Unrealized Losses	$ (14)	$ (61)
Less than Twelve Months Estimated Fair Value	$ 1,486	$ 4,600
Less than Twelve Months No. of Issuances \| Security	2	4
Twelve Months or More Unrealized Losses	$ (121)	$ (488)
Twelve Months or More Estimated Fair Value	$ 11,047	$ 6,548
Twelve Months or More No. of Issuances \| Security	7	4
Total Unrealized Losses	$ (135)	$ (549)
Total Estimated Fair Value	$ 12,533	$ 11,148
Available for sale, Total No. of Issuances \| Security	9	8
Municipal Securities
Schedule Of Available For Sale Securities [Line Items]
Held to maturity, Less than Twelve Months Unrealized Losses		$ (104)
Held to maturity, Less than Twelve Months Estimated Fair Value		$ 2,468
Held to maturity, Less than Twelve Months, No. of Issuances \| Security		6
Held to maturity, Twelve Months or More Unrealized Losses	$ (21)	$ (60)
Held to maturity, Twelve Months or More Estimated Fair Value	$ 1,853	$ 2,174
Held to maturity, Twelve Months or More, No. of Issuances \| Security	4	4
Held to maturity, Total Unrealized Losses	$ (21)	$ (164)
Held to maturity, Total Estimated Fair Value	$ 1,853	$ 4,642
Held to maturity, Total No. of Issuances \| Security	4	10

Loans and Allowance for Loan Losses - Summary of Balance and Activity Related to Allowance for Loan Losses for Held for Investment Loans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Allowance for loan losses:
Allowance for loan losses, Beginning balance	$ 17,577	$ 13,773	$ 13,773
Additions (reductions) to the allowance charged to expense	550	184
Recoveries on loans charged-off	109		36
Less loans charged-off			(701)
Allowance for loan losses, Ending balance	18,236	13,957	17,577
Real Estate
Allowance for loan losses:
Allowance for loan losses, Beginning balance	13,437	9,309	9,309
Additions (reductions) to the allowance charged to expense	952	653
Allowance for loan losses, Ending balance	14,389	9,962	13,437
Commercial
Allowance for loan losses:
Allowance for loan losses, Beginning balance	4,140	4,044	4,044
Additions (reductions) to the allowance charged to expense	(405)	(118)
Recoveries on loans charged-off	109		36
Less loans charged-off			(701)
Allowance for loan losses, Ending balance	3,844	3,926	4,140
Other
Allowance for loan losses:
Additions (reductions) to the allowance charged to expense	3
Allowance for loan losses, Ending balance	$ 3
Unallocated
Allowance for loan losses:
Allowance for loan losses, Beginning balance		420	$ 420
Additions (reductions) to the allowance charged to expense		(351)
Allowance for loan losses, Ending balance		$ 69

Loans and Allowance for Loan Losses - Summary of Recorded Investment in Loans Impairment Method and Activity in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Reserves:
Loan losses, Reserves	$ 18,236	$ 13,957	$ 17,577
Loans evaluated for impairment:
Loans, Individually evaluated for impairment	2,586	4,465	3,281
Loans, Collectively evaluated for impairment	2,117,827	1,257,150	2,138,734
Total loans, net of deferred loan fees	2,120,413	1,261,928	2,142,015
Allowance for loan losses:
Allowance for loan losses, Beginning balance	17,577	13,773	13,773
Allowance for loan losses, Provisions	550	184	4,469
Allowance for loan losses, Charge-offs			701
Recoveries on loans charged-off	109		36
Allowance for loan losses, Ending balance	18,236	13,957	17,577
Loans Acquired with Deteriorated Credit Quality
Loans evaluated for impairment:
Loans acquired		313
Specific Reserves
Reserves:
Loan losses, Reserves	11		44
General Reserves
Reserves:
Loan losses, Reserves	18,225	13,957	17,533
Real Estate
Reserves:
Loan losses, Reserves	14,389	9,962	13,393
Loans evaluated for impairment:
Loans, Individually evaluated for impairment	2,365	2,393	2,309
Loans, Collectively evaluated for impairment	1,765,585	866,176	1,750,896
Total loans, net of deferred loan fees	1,767,950	868,882	1,753,205
Allowance for loan losses:
Allowance for loan losses, Beginning balance	13,437	9,309	9,309
Allowance for loan losses, Provisions			4,128
Allowance for loan losses, Ending balance	14,389	9,962	13,437
Real Estate \| Loans Acquired with Deteriorated Credit Quality
Loans evaluated for impairment:
Loans acquired		313
Real Estate \| General Reserves
Reserves:
Loan losses, Reserves	14,389	9,962	13,393
Commercial
Reserves:
Loan losses, Reserves	3,844	3,926	4,184
Loans evaluated for impairment:
Loans, Individually evaluated for impairment	221	2,072	972
Loans, Collectively evaluated for impairment	351,906	390,974	387,838
Total loans, net of deferred loan fees	352,127	393,046	388,810
Allowance for loan losses:
Allowance for loan losses, Beginning balance	4,140	4,044	4,044
Allowance for loan losses, Provisions			761
Allowance for loan losses, Charge-offs			701
Recoveries on loans charged-off	109		36
Allowance for loan losses, Ending balance	3,844	3,926	4,140
Commercial \| Specific Reserves
Reserves:
Loan losses, Reserves	11		44
Commercial \| General Reserves
Reserves:
Loan losses, Reserves	3,833	3,926	4,140
Other
Reserves:
Loan losses, Reserves	3
Loans evaluated for impairment:
Loans, Collectively evaluated for impairment	336
Total loans, net of deferred loan fees	336
Allowance for loan losses:
Allowance for loan losses, Ending balance	3
Other \| General Reserves
Reserves:
Loan losses, Reserves	$ 3
Unallocated
Reserves:
Loan losses, Reserves		69
Allowance for loan losses:
Allowance for loan losses, Beginning balance		420	420
Allowance for loan losses, Provisions			$ (420)
Allowance for loan losses, Ending balance		69
Unallocated \| General Reserves
Reserves:
Loan losses, Reserves		$ 69

Loans and Allowance for Loan Losses - Summary of Risk Category of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 2,120,413	$ 2,142,015
Real Estate \| Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loans	125,686	113,235
Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	756,313	758,721
Real Estate \| Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loans	885,951	881,249
Commercial \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	269,556	304,310
Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	82,571	84,500
Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	336
Pass
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,071,989	2,111,225
Pass \| Real Estate \| Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loans	125,412	112,959
Pass \| Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	727,546	743,123
Pass \| Real Estate \| Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loans	884,780	880,860
Pass \| Commercial \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	256,674	295,226
Pass \| Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	77,241	79,057
Pass \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	336
Special Mention
Accounts Notes And Loans Receivable [Line Items]
Total loans	14,217	13,355
Special Mention \| Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	6,333	7,069
Special Mention \| Commercial \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	7,749	6,286
Special Mention \| Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	135
Substandard
Accounts Notes And Loans Receivable [Line Items]
Total loans	31,621	14,154
Substandard \| Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	20,343	6,496
Substandard \| Real Estate \| Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,171	389
Substandard \| Commercial \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	5,133	2,798
Substandard \| Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	4,974	4,471
Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,586	3,281
Impaired \| Real Estate \| Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loans	274	276
Impaired \| Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,091	2,033
Impaired \| Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 221	$ 972

Loans and Allowance for Loan Losses - Summary of Aging Recorded Investment Past-due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 5,324	$ 5,047
Loans Not Past Due	2,115,089	2,136,968
Total Loans	2,120,413	2,142,015
Non-Accrual Loans	166	914
Real Estate \| Construction and Land Development
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	125,686	113,235
Total Loans	125,686	113,235
Real Estate \| Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	386	678
Loans Not Past Due	755,927	758,043
Total Loans	756,313	758,721
Real Estate \| Single-family Residential Mortgages
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,056	2,498
Loans Not Past Due	883,895	878,751
Total Loans	885,951	881,249
Real Estate \| Single Family Residential Mortgages Held For Sale
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	507	458
Loans Not Past Due	374,923	434,064
Total Loans	375,430	434,522
Commercial \| Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	690
Loans Not Past Due	268,866	304,310
Total Loans	269,556	304,310
Commercial \| SBA
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,192	1,871
Loans Not Past Due	80,379	82,629
Total Loans	82,571	84,500
Non-Accrual Loans	166	914
Other
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	336
Total Loans	336
30-59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	5,158	2,505
30-59 Days \| Real Estate \| Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	386
30-59 Days \| Real Estate \| Single-family Residential Mortgages
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,056	1,548
30-59 Days \| Real Estate \| Single Family Residential Mortgages Held For Sale
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	507
30-59 Days \| Commercial \| Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	690
30-59 Days \| Commercial \| SBA
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,026	957
90 Days Or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		1,628
90 Days Or More \| Real Estate \| Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		678
90 Days Or More \| Real Estate \| Single-family Residential Mortgages
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		950
90 Days Or More \| Real Estate \| Single Family Residential Mortgages Held For Sale
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		458
90 Days Or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	166	914
90 Days Or More \| Commercial \| SBA
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 166	$ 914

Loans and Allowance for Loan Losses - Summary of Individually Impaired Loans Presented by Class of Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Impaired [Line Items]
Principal Balance	$ 2,586	$ 3,281
Recorded Investment	2,586	3,982
Average Balance	2,597	3,979
Interest Income	24	177
Related Allowance	11	44
Construction and Land Development
Financing Receivable Impaired [Line Items]
Principal Balance, With no related allowance recorded	275	276
Recorded Investment, With no related allowance recorded	275	276
Average Balance, With no related allowance recorded	275	283
Interest Income, With no related allowance recorded	6	23
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Principal Balance, With no related allowance recorded	2,090	2,033
Recorded Investment, With no related allowance recorded	2,090	2,033
Average Balance, With no related allowance recorded	2,100	2,126
Interest Income, With no related allowance recorded	17	134
Commercial \| SBA
Financing Receivable Impaired [Line Items]
Principal Balance, With no related allowance recorded	55	797
Recorded Investment, With no related allowance recorded	55	1,498
Average Balance, With no related allowance recorded	56	1,377
Interest Income, With no related allowance recorded	1	19
Principal Balance, With related allowance recorded	166	175
Recorded Investment, With related allowance recorded	166	175
Average Balance, with related allowance recorded	166	193
Interest Income, With related allowance recorded		1
Related Allowance, with related allowance recorded	$ 11	$ 44

Loans and Allowance for Loan Losses - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Loan	Mar. 31, 2018 USD ($) Loan	Dec. 31, 2018 USD ($) Loan
Financing Receivable Recorded Investment [Line Items]
Interest income recognized on cash basis	$ 0	$ 0	$ 0
Number of loans identified as troubled debt restructurings \| Loan	4		4
Troubled debt restructuring, aggregate balance	$ 2,400,000		$ 2,400,000
Specific reserve	18,236,000	$ 13,957,000	17,577,000
Commitments to lend an additional amounts of outstanding loans are classified as TDR's	$ 0		0
Financing receivable modified as TDR's \| Loan	0	1
One Loan
Financing Receivable Recorded Investment [Line Items]
Specific reserve	$ 0		$ 0

Loan Servicing - Schedule of Principal Balances of Mortgage and SBA Loans Serviced for Others (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Mortgage Loans
Schedule Of Mortgage And Small Business Administration Loans Serviced [Line Items]
Loans serviced for others	$ 1,654,411	$ 1,586,499
SBA Loans
Schedule Of Mortgage And Small Business Administration Loans Serviced [Line Items]
Loans serviced for others	181,627	184,664
Commercial Real Estate Loans
Schedule Of Mortgage And Small Business Administration Loans Serviced [Line Items]
Loans serviced for others	$ 4,267	$ 2,838

Loan Servicing - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	$ 17,288		$ 17,370
Servicing fees net of servicing asset amortization	840	$ (31)
Mortgage Loans
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	13,700		15,300
SBA Loans
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	$ 6,300		$ 6,100

Loan Servicing - Schedule of Amortization of Mortgage Servicing Rights Netted Against Loan Servicing Fee Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Mortgage Loans
Servicing assets:
Beginning of year	$ 12,858	$ 1,540
Additions	604	315
Disposals	(33)	(39)
Amortized to expense	(466)	(155)
End of period	12,963	1,661
SBA Loans
Servicing assets:
Beginning of year	4,512	4,417
Additions	112	484
Disposals	(127)	(425)
Amortized to expense	(172)	(158)
End of period	$ 4,325	$ 4,318

Goodwill and Intangibles - Additional information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]
Goodwill	$ 58,383,000		$ 58,383,000
Impairment losses recognized on goodwill	0	$ 0
Amortization of intangibles	388,000	81,000
Core Deposit Intangible
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]
Unamortized balance of intangible assets	7,200,000		$ 7,600,000
Amortization of intangibles	$ 388,000	$ 81,000
Core Deposit Intangible \| Minimum
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]
Intangible assets, estimated useful life	8 years
Core Deposit Intangible \| Maximum
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]
Intangible assets, estimated useful life	10 years

Goodwill and Intangibles - Schedule of Future Estimated Amortization Expense (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2019	$ 1,112
2020	1,284
2021	1,056
2022	879
2023	749
Thereafter	2,132
Total	$ 7,212

Deposits - Schedule of Maturities of Time Deposits (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Maturities Of Time Deposits [Abstract]
One year	$ 1,143,844
Two to three years	137,650
Over three years	2,934
Total	$ 1,284,428

Long-term Debt - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended
	Nov. 30, 2018	Mar. 31, 2016	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt instrument, face amount			$ 105,000,000	$ 105,000,000
6.5% Fixed to Floating Rate Subordinated Debentures, Due March 31, 2026
Debt Instrument [Line Items]
Debt instrument, face amount		$ 50,000,000
Long-term debt, fixed interest rate		6.50%
Debt instrument, due date		Mar. 31, 2026
Debt instrument, fixed to floating interest rate conversion date		Mar. 31, 2021
Debt instrument, floating rate description			3 month LIBOR plus 516 basis points
Debt instrument, basis points		5.16%
Tier-1 capital			$ 35,000,000
Debt instrument, redemption period, start date			Mar. 31, 2021
6.18% Fixed to Floating Rate Subordinated Debentures, Due December 1, 2028
Debt Instrument [Line Items]
Debt instrument, face amount	$ 55,000,000
Long-term debt, fixed interest rate	6.18%
Debt instrument, due date	Dec. 01, 2028
Debt instrument, fixed to floating interest rate conversion date	Dec. 01, 2023
Debt instrument, floating rate description			3 month LIBOR plus 315 basis points
Debt instrument, basis points	3.15%
Tier-1 capital			$ 25,000,000
Debt instrument, redemption period, start date			Dec. 01, 2023

Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Debt Instruments [Abstract]
Principal	$ 105,000,000	$ 105,000,000
Unamortized debt issuance costs	$ 1,207,000	$ 1,292,000

Subordinated Debentures - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended
	Feb. 19, 2016	Mar. 15, 2012	Oct. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018
Debt Instrument [Line Items]
Debt instrument, face amount				$ 105,000,000			$ 105,000,000
Debt amortization expense					$ 42,000	$ 23,000
Interest expenses, paid				$ 144,000	42,000
Subordinated Debentures
Debt Instrument [Line Items]
Percentage of principal amount redeemed		100.00%
Debt instrument redemption period				Mar. 15, 2012
Debt instrument maturity period				Mar. 15, 2037
Defer interest payments maximum period				5 years
Debt instrument interest rate description				three month London Interbank Offered Rate (LIBOR) plus 1.65%, which was 4.26% as of March 31, 2019 and 4.45% at December 31, 2018
Debt instrument interest percentage				4.26%			4.45%
TFC Statutory Trust \| Private Offering
Debt Instrument [Line Items]
Number of trust preferred securities	5,000
Trust preferred securities liquidation amount per preferred security	$ 1,000
TFC Statutory Trust \| Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, face amount	$ 5,000,000
Debt valuation reserve				$ 1,900,000
Debt amortization expense				42,000	$ 23,000
TFC Statutory Trust \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Subordinated debenture liability	$ 3,300,000
First American International Statutory Trust I
Debt Instrument [Line Items]
Number of units issued			7,000
Aggregate liquidation amount of units issued			$ 7,000,000
Floating rate maturity period			30 years
First American International Statutory Trust I \| Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, face amount			$ 7,000,000
Debt valuation reserve				$ 1,200,000
Debt instrument maturity period				Dec. 15, 2034
Defer interest payments maximum period				5 years
Debt instrument interest rate description				the three-month LIBOR plus 2.25% through final maturity on December 15, 2034. The rate at March 31, 2019, was 4.86% and 5.04% at December 31, 2018
Debt instrument interest percentage				4.86%			5.04%
Other Assets
Debt Instrument [Line Items]
Investment in common stock				$ 155,000
Other Assets \| First American International Statutory Trust I
Debt Instrument [Line Items]
Investment in common stock				$ 217,000
London Interbank Offered Rate \| Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, basis points				1.65%
London Interbank Offered Rate \| First American International Statutory Trust I \| Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, basis points				2.25%

Borrowing Arrangements - Additional Information (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Line of credit amount outstanding	$ 0	$ 0
FRB Secured Line of Credit
Debt Instrument [Line Items]
Borrowing capacity	15,500,000
Carrying value of collateral loan pledged	27,200,000
FHLB Secured Line of Credit
Debt Instrument [Line Items]
Borrowing capacity	823,400,000
Carrying value of collateral loan pledged	943,000,000
FHLB
Debt Instrument [Line Items]
Overnight advances	$ 275,000,000	$ 319,500,000
Overnight advances interest percentage	2.60%	2.56%
Zions Bank
Debt Instrument [Line Items]
Borrowing capacity	$ 20,000,000
Wells Fargo Bank
Debt Instrument [Line Items]
Borrowing capacity	10,000,000
Wells Fargo Bank \| Letter of Credit
Debt Instrument [Line Items]
Borrowing capacity	2,000,000
First Tennessee National Bank
Debt Instrument [Line Items]
Borrowing capacity	12,000,000
Pacific Coast Bankers' Bank
Debt Instrument [Line Items]
Borrowing capacity	$ 5,000,000

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 3,859,000	$ 1,580,000
Effective tax rate	27.10%	15.20%
Tax benefit from stock option exercises	$ 133,000	$ 1,400,000

Commitments - Schedule of Future Minimum Rent Payments on Company's Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2019 remaining	$ 4,212
2020	5,081
2021	3,639
2022	3,470
2023	2,936
Thereafter	9,150
Total	$ 28,488

Commitments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Total rental expense, recognized on straight-line basis	$ 1,500	$ 437,000

Commitments - Schedule of Financial Commitments whose Contractual Amount Represents Credit Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Financial commitments, contractual amount	$ 255,432	$ 272,336
Commitments to Extend Credit
Loss Contingencies [Line Items]
Financial commitments, contractual amount	250,579	267,920
Commercial and Similar Letters of Credit
Loss Contingencies [Line Items]
Financial commitments, contractual amount	1,179	1,042
Standby Letters of Credit
Loss Contingencies [Line Items]
Financial commitments, contractual amount	$ 3,674	$ 3,374

Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Related Party Transactions [Abstract]
Beginning balance	$ 3,600	$ 2,300
New loans and advances	3,600	7,400
Repayments	(3,600)	(6,100)
Ending balance	$ 3,600	$ 3,600

Related Party Transactions - Additional Information (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Executive Officers, Directors and their Related Interests
Related Party Transaction [Line Items]
Loan commitments outstanding to related parties	$ 800,000	$ 800,000
Principal Officers, Directors and their Affiliates
Related Party Transaction [Line Items]
Deposits from related parties	$ 51,100,000	$ 52,100,000

Stock-based Compensation - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 18, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 231,000	$ 131,000
Income tax benefits recognized	$ 92,000	$ 1,400,000
2010 Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance	3,494,478
Additional shares of common stock available for grant	0
2010 Stock Option Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved as percentage of issued and outstanding shares	30.00%
Omnibus Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance			3,848,341
Percentage of number of shares of common stock issued and outstanding	19.00%
Available for issuance of common stock	1,254,045
Omnibus Stock Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved as percentage of issued and outstanding shares			30.00%

Regulatory Matters - Additional Information (Details) - USD ($)						3 Months Ended
	Jan. 01, 2019	Jan. 01, 2018	Jan. 02, 2017	Jan. 02, 2016	Jan. 01, 2015	Mar. 31, 2019	Dec. 31, 2018
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Common equity Tier 1 capital to risk-weighted assets ratio with minimum for capital adequacy					4.50%
Common equity Tier 1 capital to risk-weighted assets ratio with minimum for prompt corrective action purposes					6.50%
Tier 1 capital to risk-weighted assets ratio with minimum for capital adequacy					4.00%
Increased Tier 1 capital to risk-weighted assets ratio with minimum for capital adequacy					6.00%
Tier 1 capital to risk-weighted assets ratio with minimum for prompt corrective action purposes					6.00%
Increased Tier 1 capital to risk-weighted assets ratio with minimum for prompt corrective action purposes					8.00%
Capital conservation buffer	2.50%	2.50%	2.50%	0.625%	2.50%
Capital conservation buffer phased-in on pro rata basis period				4 years
Royal Business Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital to risk-weighted assets ratio with minimum for capital adequacy						6.00%	6.00%
Tier 1 capital to risk-weighted assets ratio with minimum for prompt corrective action purposes						8.00%	8.00%
Capital conservation buffer						12.38%
RBB Bancorp
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer						10.80%
Minimum
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Regulatory assets	$ 1,000,000,000
Required assets to liabilities ratio after dividend effect						125.00%

Regulatory Matters - Summary of Company and Bank Continue to Exceed Regulatory Capital Minimum Requirements and Bank Continues to Exceed Well Capitalized Standards (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Jan. 01, 2015
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio			4.00%
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio			6.00%
RBB Bancorp
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 Leverage Ratio, Amount	$ 331,144	$ 321,407
Tier 1 Leverage Ratio, Ratio	11.61%	11.80%
Common Equity Tier 1 Risk-Based Capital Ratio, Amount	$ 321,596	$ 311,901
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio	16.29%	15.28%
Tier 1 Risk-Based Capital Ratio, Amount	$ 331,144	$ 321,407
Tier 1 Risk-Based Capital Ratio, Ratio	16.77%	15.74%
Total Risk-Based Capital Ratio, Amount	$ 453,811	$ 443,379
Total Risk-Based Capital Ratio, Ratio	22.98%	21.71%
Royal Business Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 Leverage Ratio, Amount	$ 382,681	$ 370,304
Tier 1 Leverage Ratio, Ratio	13.43%	13.66%
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 113,970	$ 108,445
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 142,462	$ 135,556
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio	5.00%	5.00%
Common Equity Tier 1 Risk-Based Capital Ratio, Amount	$ 382,681	$ 370,304
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio	19.39%	18.17%
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 88,669	$ 91,722
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	4.50%	4.50%
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 128,078	$ 132,487
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio	6.50%	6.50%
Tier 1 Risk-Based Capital Ratio, Amount	$ 382,681	$ 370,304
Tier 1 Risk-Based Capital Ratio, Ratio	19.39%	18.17%
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 118,225	$ 122,296
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	6.00%	6.00%
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 157,634	$ 163,061
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio	8.00%	8.00%
Total Risk-Based Capital Ratio, Amount	$ 401,555	$ 388,569
Total Risk-Based Capital Ratio, Ratio	20.35%	19.07%
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 157,634	$ 163,061
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	8.00%	8.00%
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 197,042	$ 203,826
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio	10.00%	10.00%

Fair Value Measurements - Schedule of Hierarchy and Fair Value for Each Major Category of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value Measurements, Recurring Basis
Assets measured at fair value:
Assets measured at fair value	$ 58,537	$ 73,762
Fair Value Measurements, Recurring Basis \| Government Agency Securities
Assets measured at fair value:
Assets measured at fair value	1,699	1,815
Fair Value Measurements, Recurring Basis \| SBA Agency Securities
Assets measured at fair value:
Assets measured at fair value	5,119	5,169
Fair Value Measurements, Recurring Basis \| Mortgage-Backed Securities
Assets measured at fair value:
Assets measured at fair value	22,146	22,541
Fair Value Measurements, Recurring Basis \| Collateralized Mortgage Obligations
Assets measured at fair value:
Assets measured at fair value	11,981	12,066
Fair Value Measurements, Recurring Basis \| Corporate Debt Securities
Assets measured at fair value:
Assets measured at fair value	17,592	32,171
Fair Value Measurements, Nonrecurring Basis \| Other Real Estate Owned
Assets measured at fair value:
Assets measured at fair value	2,056	1,101
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis
Assets measured at fair value:
Assets measured at fair value	58,537	73,762
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis \| Government Agency Securities
Assets measured at fair value:
Assets measured at fair value	1,699	1,815
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis \| SBA Agency Securities
Assets measured at fair value:
Assets measured at fair value	5,119	5,169
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis \| Mortgage-Backed Securities
Assets measured at fair value:
Assets measured at fair value	22,146	22,541
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis \| Collateralized Mortgage Obligations
Assets measured at fair value:
Assets measured at fair value	11,981	12,066
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis \| Corporate Debt Securities
Assets measured at fair value:
Assets measured at fair value	17,592	32,171
Fair Value Measurements Using Level 3 \| Fair Value Measurements, Nonrecurring Basis \| Other Real Estate Owned
Assets measured at fair value:
Assets measured at fair value	$ 2,056	$ 1,101

Fair Value Measurements - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) Property	Dec. 31, 2018 USD ($)
Fair Value Option Quantitative Disclosures [Line Items]
Write-downs to OREO	$ 0	$ 0
Other Real Estate Owned \| Single-Family Residences
Fair Value Option Quantitative Disclosures [Line Items]
Number of other real estate owned \| Property	2
Assets measured at fair value	$ 1,100,000
Other Real Estate Owned \| Non-Farm, Non-Residential Property
Fair Value Option Quantitative Disclosures [Line Items]
Number of other real estate owned \| Property	1
Assets measured at fair value	$ 965,000

Fair Value Measurements - Summary of Quantitative Information About OREO Non-recurring Level 3 Fair Value Measurements (Details) - Other Real Estate Owned $ in Thousands	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value Measurements, Nonrecurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 2,056	$ 1,101
Level 3 \| Fair Value Measurements, Nonrecurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	2,056	1,101
Level 3 \| Third Party Appraisals \| Fair Value Measurements, Nonrecurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 2,056	$ 1,101
Level 3 \| Third Party Appraisals \| Measurement Input, Comparability Adjustment
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value Adjustment	15	16
Level 3 \| Third Party Appraisals \| Measurement Input, Comparability Adjustment \| Weighted Average
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value Adjustment	15	16

Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Level and Estimated Fair Value of Significant Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial Assets:
Investment securities - AFS	$ 58,537	$ 73,762
Investment securities - HTM	9,599	9,940
Carrying Value
Financial Assets:
Cash and due from banks	250,079	147,685
Interest-earning deposits in other financial institutions	1,196	600
Investment securities - AFS	58,537	73,762
Investment securities - HTM	9,449	9,961
Mortgage loans held for sale	375,430	434,522
Loans, net	2,102,177	2,124,438
Equity Security	10,250	10,039
Financial Liabilities:
Deposits	2,184,340	2,144,041
FHLB advances	275,000	319,500
Long-term debt	103,793	103,708
Subordinated debenture liability	9,548	9,506
Fair Value \| Fair Value, Inputs, Level 1
Financial Assets:
Cash and due from banks	250,079	147,685
Interest-earning deposits in other financial institutions	1,196	600
Mortgage loans held for sale	379,289	438,948
Fair Value \| Fair Value Measurements Using Level 2
Financial Assets:
Investment securities - AFS	58,537	73,762
Investment securities - HTM	9,599	9,940
Financial Liabilities:
Deposits	2,178,281	2,143,196
FHLB advances	275,000	319,500
Long-term debt	100,296	98,509
Fair Value \| Fair Value Measurements Using Level 3
Financial Assets:
Loans, net	2,131,065	2,114,341
Equity Security	10,250	10,039
Financial Liabilities:
Subordinated debenture liability	$ 10,760	$ 10,356

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income as reported	$ 10,380	$ 8,847
Shares outstanding	20,073,991	16,288,928
Impact of weighting shares	(26,275)	(206,033)
Used in basic EPS, Income	$ 10,380	$ 8,847
Used in basic EPS, Shares	20,047,716	16,082,895
Dilutive effect of outstanding
Stock options, Shares	389,025	1,079,425
Used in dilutive EPS, Income	$ 10,380	$ 8,847
Used in dilutive EPS, Shares	20,436,741	17,162,320
Basic earnings per common share	$ 0.52	$ 0.55
Diluted earnings per common share	$ 0.51	$ 0.52

Revenue From Contracts With Customers - Summary of Revenue From Contracts With Customers in-Scope and Not in-Scope under Topic 606 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income	$ 787	$ 421
Non-interest income, not in scope	3,415	2,034
Total noninterest income	4,202	2,455
Fees and Service Charges on Deposit Accounts
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income	298	288
Other Fees
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income	198	6
Other Income
Disaggregation Of Revenue [Line Items]
Total in-scope non-interest income	$ 291	$ 127

Qualified Affordable Housing Project Investments - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Investment for qualified affordable housing projects	$ 9,300,000		$ 9,500,000
Unfunded commitments related to the investments in qualified affordable housing projects	6,200,000		$ 6,800,000
Amortization expense	$ 225,000	$ 139,000
Maximum
Schedule Of Equity Method Investments [Line Items]
Expected year in which commitments are fulfilled	2027
Minimum
Schedule Of Equity Method Investments [Line Items]
Expected year in which commitments are fulfilled	2028

Recent Developments - Additional Information (Details) - Subsequent Event	Apr. 17, 2019 $ / shares
Recent Developments [Line Items]
Cash dividend declared date	Apr. 17, 2019
Cash dividends declared per share	$ 0.10
Cash dividend payable date	May 15, 2019
Cash dividend declared, record date	May 02, 2019