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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2018	Aug. 08, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	RBB
Entity Registrant Name	RBB BANCORP
Entity Central Index Key	0001499422
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		16,544,627

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 72,788	$ 70,048
Federal funds sold and other cash equivalents		80,000
Cash and cash equivalents	72,788	150,048
Interest-earning deposits in other financial institutions	600	600
Securities:
Available for sale (amortized cost of $63,157 and $65,587 at June 30, 2018 and December 31, 2017, respectively)	61,299	64,957
Held to maturity (fair value of $9,982 and $10,250 at June 30, 2018 and December 31, 2017, respectively)	9,986	10,009
Mortgage loans held for sale	281,755	125,847
Loans held for investment:
Real estate	876,494	839,230
Commercial	407,052	410,812
Total loans	1,283,546	1,250,042
Unaccreted discount on acquired loans	(1,488)	(2,762)
Deferred loan costs (fees), net	2,024	1,794
Total loans, net of deferred loan fees	1,284,082	1,249,074
Allowance for loan losses	(14,657)	(13,773)
Net loans	1,269,425	1,235,301
Premises and equipment	7,502	6,583
Federal Home Loan Bank stock	7,738	6,770
Net deferred tax assets	7,089	6,086
Income tax receivable	2,170	272
Other real estate owned	293	293
Cash surrender value of life insurance	33,180	32,782
Goodwill	29,940	29,940
Servicing assets	6,134	5,957
Core deposit intangibles	1,280	1,438
Accrued interest and other assets	25,693	14,176
Total assets	1,816,872	1,691,059
Deposits:
Noninterest-bearing demand	306,362	285,690
Savings, NOW and money market accounts	424,261	411,663
Time deposits under $250,000	268,967	293,471
Time deposits $250,000 and over	424,816	346,457
Total deposits	1,424,406	1,337,281
Reserve for unfunded commitments	483	282
FHLB advances	40,000	25,000
Long-term debt	49,601	49,528
Subordinated debentures	3,470	3,424
Accrued interest and other liabilities	12,710	10,368
Total liabilities	1,530,670	1,425,883
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; 16,544,627 shares issued and outstanding at June 30, 2018 and 15,908,893 shares at December 31,2017	214,025	205,927
Additional paid-in capital	6,680	8,426
Retained earnings	66,804	51,266
Accumulated other comprehensive income (loss) - net unrealized loss on securities available for sale, net of tax benefit of $551 at June 30, 2018 and $186 at December 31, 2017	(1,307)	(443)
Total shareholders’ equity	286,202	265,176
Total liabilities and shareholders’ equity	$ 1,816,872	$ 1,691,059

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 63,157	$ 65,587
Securities held to maturity, fair value	$ 9,982	$ 10,250
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	16,544,627	15,908,893
Common stock, shares outstanding	16,544,627	15,908,893
Accumulated other comprehensive income (loss) - net unrealized loss on securities available for sale, tax benefit	$ 551	$ 186

CONSOLIDATED STATEMENTS OF INCOME - (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest and dividend income:
Interest and fees on loans	$ 21,132	$ 16,759	$ 40,206	$ 32,792
Interest on interest-earning deposits	209	209	395	360
Interest on investment securities	603	313	1,163	591
Dividend income on FHLB stock	134	82	253	235
Interest on federal funds sold and other	206	158	443	302
Total interest income	22,284	17,521	42,460	34,280
Interest expense:
Interest on savings deposits, now and money market accounts	998	575	1,700	1,049
Interest on time deposits	2,410	1,993	4,456	3,842
Interest on subordinated debentures and other	920	907	1,833	1,812
Interest on other borrowed funds	129	12	200	29
Total interest expense	4,457	3,487	8,189	6,732
Net interest income	17,827	14,034	34,271	27,548
Provision for credit losses	700	(4,188)	884	(4,188)
Net interest income after provision for credit losses	17,127	18,222	33,387	31,736
Noninterest income:
Service charges, fees and other	446	646	912	1,106
Gain on sale of loans	2,085	2,289	3,900	3,786
Loan servicing fees, net of amortization	58	(5)	27	257
Recoveries on loans acquired in business combinations	5	29	11	57
Increase in cash surrender value of life insurance	199	216	398	401
Total noninterest income	2,793	3,175	5,248	5,607
Noninterest expense:
Salaries and employee benefits	4,709	4,243	9,660	8,426
Occupancy and equipment expenses	834	727	1,626	1,471
Data processing	487	454	960	806
Legal and professional	423	296	680	(91)
Office expenses	192	177	363	331
Marketing and business promotion	262	143	465	325
Insurance and regulatory assessments	213	205	422	410
Amortization of intangibles	77	87	158	181
OREO expenses		14	7	28
Other expenses	994	614	2,139	1,651
Total noninterest expense	8,191	6,960	16,480	13,538
Income before income taxes	11,729	14,437	22,155	23,805
Income tax expense	2,292	5,901	3,872	9,776
Net income	$ 9,437	$ 8,536	$ 18,283	$ 14,029
Net income per share
Basic	$ 0.58	$ 0.67	$ 1.13	$ 1.09
Diluted	0.54	$ 0.62	1.06	1.02
Cash dividends declared per common share	$ 0.09		$ 0.17	$ 0.30

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 9,437	$ 8,536	$ 18,283	$ 14,029
Other comprehensive income (loss):
Unrealized gains (losses) on securities available for sale, Change in unrealized gains (losses)	(379)	185	(1,227)	300
Unrealized gains (losses) on securities available for sale	(379)	185	(1,227)	300
Related income tax effect, Change in unrealized gains (losses)	112	(76)	363	(123)
Related income tax effect	112	(76)	363	(123)
Total other comprehensive income	(267)	109	(864)	177
Total comprehensive income	$ 9,170	$ 8,645	$ 17,419	$ 14,206

- 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	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2016	$ 181,585	$ 142,651	$ 8,417	$ 30,784	$ (267)
Beginning balance, shares at Dec. 31, 2016		12,827,803
Net income	14,029			14,029
Stock-based compensation	395		395
Cash dividend	(3,849)			(3,849)
Other comprehensive income, net of taxes	177				177
Ending balance at Jun. 30, 2017	192,337	$ 142,651	8,812	40,964	(90)
Ending balance, shares at Jun. 30, 2017		12,827,803
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	15,908,893
Net income	$ 18,283			18,283
Stock-based compensation	262		262
Cash dividend	(2,745)			(2,745)
Stock options exercised	6,090	$ 8,098	(2,008)
Stock options exercised, shares		635,734
Other comprehensive income, net of taxes	(864)				(864)
Ending balance at Jun. 30, 2018	$ 286,202	$ 214,025	$ 6,680	$ 66,804	$ (1,307)
Ending balance, shares at Jun. 30, 2018	16,544,627	16,544,627

- 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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income	$ 18,283	$ 14,029
Adjustments to reconcile net income to net cash from
Depreciation and amortization of premises, equipment and intangibles	417	664
Net accretion of securities, loans, deposits, and other	(742)	(881)
Provision for credit losses	884	(4,188)
Stock-based compensation	262	395
Deferred tax benefit	(1,897)
Gain on sale of loans	(3,900)	(3,786)
Increase in cash surrender value of life insurance	(398)	(401)
Loans originated and purchased for sale	(208,830)	(101,210)
Proceeds from loans sold	130,010	87,387
Other items	2,390	(2,392)
Net cash used in operating activities	(63,521)	(10,383)
Investing activities
Decrease in interest-earning deposits		245
Securities available for sale:
Purchases	(31,898)	(2,000)
Maturities, prepayments and calls	34,259	2,167
Purchase of FHLB stock and other equity securities, net	(8,010)	(27)
Purchase of investment in qualified affordable housing projects	(4,500)
Net increase in loans	(107,957)	(57,571)
Purchase of life insurance		(10,000)
Purchases of premises and equipment	(1,103)	(200)
Net cash used in investing activities	(119,209)	(67,386)
Financing activities
Net increase in demand deposits and savings accounts	33,270	93,373
Net increase in time deposits	53,855	32,398
Net increase in FHLB advances	15,000
Cash dividends paid	(2,745)	(3,849)
Exercise of stock options	6,090
Net cash from financing activities	105,470	121,922
Net (decrease) increase in cash and cash equivalents	(77,260)	44,153
Cash and cash equivalents at beginning of period	150,048	118,713
Cash and cash equivalents at end of period	72,788	162,866
Cash paid during the period:
Interest paid	1,107	6,793
Taxes paid	6,085	9,690
Non-cash investing and financing activities:
Transfer of loan to available for sale securities		1,000
Transfer of loans to held for sale	72,211	67,188
Net change in unrealized holding gain on securities available for sale	$ (1,227)	$ 300

Business Description	6 Months Ended
Business Description	Jun. 30, 2018
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. Our principal business is to serve as the holding company for our wholly-owned subsidiaries, Royal Business Bank, a California-chartered commercial bank (“Bank”), and RBB Asset Management Company (“RAM”), all collectively referred to herein as “the Company”, “we”, “our” or “us”. All significant intercompany transactions have been eliminated. RBB Bancorp was formed in January 2011 to be the bank holding company of the Bank. RAM was formed in 2012 to hold and manage problem assets acquired in business combinations. RBB Bancorp has no significant business activity other than its investments in the Bank and RAM. In 2016 the Bank became a Community Development Financial Institution and uses any grants we receive to invest back into the low to moderate income areas in the communities we serve. At June 30, 2018, the Company had total assets of $1.8 billion, gross loans of $1.3 billion, total deposits of $1.4 billion and total stockholders' equity of $286.2 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 and Ventura County in California and in Las Vegas, which is in Clark County, Nevada, 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, Los Angeles, Monterey Park, Oxnard, Rowland Heights, San Gabriel, Silver Lake, Torrance, West LA, and Westlake Village, California and Las Vegas, Nevada. . We generate our revenue primarily from interest received on loans and leases to customers, who are predominately small and middle-market businesses and individuals, and to a lesser extent, from interest received on investment securities. We have also derived income from noninterest sources, such as fees received in connection with various lending and deposit services, residential mortgage loan originations, loan servicing and gain on sales of loans. Our 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. We completed four acquisitions between July 8, 2011 and February 19, 2016. Our 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. See Note 3 – Acquisitions, for more information about our acquisition transactions.

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
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 six months ended June 30, 2018 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, 2017, included in our annual report filed on Form 10-K for the fiscal year ended December 31, 2017 (our “2017 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, 2017, included in our 2017 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 and six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ended December 31, 2018. 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 plans to adopt ASU 2014-09 as of January 1, 2019, utilizing the modified prospective approach. Company will perform an overall assessment of revenue streams potentially affected by the ASU, including certain deposit related fees and interchange fees, to determine the impact this guidance will have on our consolidated financial statements. 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. 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. Based upon an evaluation of the guidance in ASU 2016-01 the Company determined the ASU will not have a material impact on the Company’s consolidated financial statements as the accounting for other financial instruments, such as loans, investments in debt securities, and financial liabilities is largely unchanged. The Company adopted this ASU as of January 1, 2018 but will continue to monitor any updates to the guidance. 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, 2019. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718.) ASU 2016-09 includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. Under ASU 2016-09, excess tax benefits and certain tax deficiencies will no longer be recorded in additional paid-in capital (APIC). Instead, they will record all excess tax benefits and tax deficiencies as income tax expense or benefit in the income statement, and APIC pools will be eliminated. In addition, the guidance requires excess tax benefits be presented as an operating activity on the statement of cash flows rather than as a financing activity. ASU 2016-09 also permits an accounting policy election for the impact of forfeitures on the recognition of expense for share-based payment awards. Forfeitures can be estimated, as required today, or recognized when they occur. This guidance is effective for public business entities for interim and annual reporting periods beginning after December 15, 2016, and for nonpublic business entities annual reporting periods beginning after December 15, 2017, and interim periods within the reporting periods beginning after December 15, 2018. Early adoption is permitted, but all of the guidance must be adopted in the same period. The Company early adopted the ASU as of January 1, 2017. The Company plans to recognize forfeitures as they occur. The early adoption of the ASU did not have a material effect on the company’s financial statements or disclosures. 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 access 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 August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (Topic 230). The new guidance clarifies the classification within the statement of cash flows for certain transactions, including debt extinguishment costs, zero-coupon debt, contingent consideration related to business combinations, insurance proceeds, equity method distributions and beneficial interests in securitizations. The guidance also clarifies that cash flows with aspects of multiple classes of cash flows that cannot be separated by source or use should be classified based on the activity that is likely to be the predominant source or use of cash flows for the item. This guidance is effective for fiscal years beginning after December 15, 2017 and will require application using a retrospective transition method. The Company adopted this statement as of January 1, 2018. The Company believes the requirement to separately identify cash flows and application of the predominance principle is the cash flow item currently applicable to the consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. Currently, Topic 805 specifies three elements of a business – inputs, processes, and outputs. While an integrated set of assets and activities (collectively referred to as a “set”) that is a business usually has outputs, outputs are not required. In addition, all the inputs and processes that a seller uses in operating a set are not required if market participants can acquire the set and continue to produce outputs, for example, by integrating the acquired set with their own inputs and processes. This led many transactions to be accounted for as business combinations rather than asset purchases under legacy GAAP. The primary goal of ASU 2017-01 is to narrow the definition of a business, and the guidance in this update provides a screen to determine when a set is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. The amendments in this update are effective for public business entities for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The amendments in this update should be applied prospectively on or after the effective date. The Company adopted this ASU on January 1, 2018 and will be applied prospectively for any future business combinations. 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 access 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 codification 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. The Company does not expect this ASU to have a material impact on the Company’s consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” This Update allows a reclassification from accumulated other comprehensive income (“AOCI”) to retained earnings for stranded tax effects resulting from the new U.S. Federal corporate income tax rate enacted on December 22, 2017. The amendments in this Update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company elected to early adopt ASU 2018-02 and elected to reclassify the income tax effects of the Tax Reform Act from AOCI to retained earnings. The amount of the reclassification is $72,000, which is the difference between the historical corporate income tax rate and the newly enacted 21% corporate income tax rate. In February 2018, the FASB issued ASU 2018-03, “Technical Corrections and Improvements to Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.” The ASU clarifies certain aspects of the guidance issued in ASU 2016-01. There are two issues addressed that may affect RBB: (1) Equity Securities without a Readily Determinable Fair Value—Discontinuation, and (2) Equity Securities without a Readily Determinable Fair Value—Adjustments. Similar to ASU 2016-01, this ASU is generally effective for emerging growth company fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company will continue to assess the potential impact that this ASU will have 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.

Acquisitions	6 Months Ended
Acquisitions	Jun. 30, 2018
Business Combinations [Abstract]
Acquisitions	NOTE 3 - ACQUISITION On April 23, 2018, RBB and First American International Corporation (“FAIC”) entered into an Agreement and Plan of Merger (the “Merger Agreement”), providing for the merger of FAIC with and into RBB, with RBB as the surviving corporation (the “Merger”). Immediately following the effectiveness of the Merger, First American International Bank, a wholly-owned subsidiary of FAIC (“FAIB”) will be merged with and into the Bank, with the Bank being the surviving bank in the merger (the “Bank Merger”). Pursuant to the terms and subject to the conditions of the Merger Agreement, which has been unanimously approved by each of the Boards of Directors of RBB and FAIC, at the effective time of the Merger (the “Effective Time”), each share of the common stock of FAIC will be convertible into the right to receive (i) 1.3472 shares of the common stock, no par value per share, of RBB and (ii) $15.30 in cash. Holders of in-the-money FAIC stock options (“FAIC Stock Options”) will receive an amount equal to (1) $51.00 minus (2) the exercise price per share with respect to the corresponding FAIC Stock Option. Pursuant to the terms of the Merger Agreement, RBB and FAIC have agreed that FAIC will repurchase its currently outstanding $17 million of preferred stock held by the United States Treasury and issued under the Troubled Asset Relief Program prior to completion of the Merger (the “TARP Redemption”) and that RBB will assist in financing such repurchase, if necessary. The Merger Agreement contains customary representations, warranties and covenants made by each of RBB and FAIC, and the completion of the Merger and the Bank Merger are subject to certain conditions. The Merger Agreement contains certain termination rights for both RBB and FAIC including, among others, if the Merger is not consummated on or before April 30, 2019, unless further extended in accordance with the Merger Agreement; if there is a Material Adverse Effect with respect to FAIC or RBB; or if the requisite approval of the shareholders of FAIC is not obtained. In addition, FAIC is entitled under certain circumstances to terminate the Merger Agreement and enter into a definitive agreement with a third party providing for a superior offer and, in connection therewith, to concurrently pay to RBB a termination fee in such event equal to $5,000,000 (the "Termination Fee"). The Termination Fee is also payable by FAIC or RBB upon termination of the Merger Agreement in certain other instances as set forth in the Merger Agreement. The Merger is expected to close in the early fourth quarter of 2018. The foregoing summary of the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Merger Agreement, which is filed as Exhibit 2.1 to the Current Report on Form 8-K filed by the Company on April 23, 2018.

Investment Securities

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 and December 31, 2017, 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
June 30, 2018	Cost		Gains		Losses			Value
Available for sale
Government agency securities	$	1,949	$	—	$	(95	)	$	1,854
Mortgage-backed securities
Government sponsored agencies		43,453		0		(1,611	)		41,842
Corporate debt securities		17,755		90		(242	)		17,603
Total	$	63,157	$	90	$	(1,948	)	$	61,299

Held to maturity
Municipal taxable securities	$	4,293	$	155	$	—		$	4,448
Municipal securities		5,693		4		(163	)		5,534
Total	$	9,986	$	159	$	(163	)	$	9,982

December 31, 2017
Available for sale
Government agency securities	$	7,968	$	—	$	(152	)	$	7,816
Mortgage-backed securities
Government sponsored agencies		39,806		17		(608	)		39,215
Corporate debt securities		17,813		161		(48	)		17,926
Total	$	65,587	$	178	$	(808	)	$	64,957

Held to maturity
Municipal taxable securities	$	4,295	$	228	$	—		$	4,523
Municipal securities		5,714		32		(19	)		5,727
Total	$	10,009	$	260	$	(19	)	$	10,250

One security with a fair value of $729,000 and $796,000 at June 30, 2018 and December 31, 2017, respectively, was pledged to secure a local agency deposit.

The amortized cost and fair value of the investment securities portfolio at June 30, 2018 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.

	Available for Sale				Held to Maturity
	Amortized		Fair		Amortized		Fair
(dollars in thousands)	Cost		Value		Cost		Value
Within one year	$	1,686	$	1,668	$	499	$	504
Due from one to five years		29,886		28,984		2,280		2,344
Due from five to ten years		27,548		26,702		2,390		2,481
Due from ten years and greater		4,037		3,945		4,817		4,653
Total	$	63,157	$	61,299	$	9,986	$	9,982

The following table summarizes available for sale securities with unrealized losses at June 30, 2018 and December 31, 2017, aggregated by major security type and length of time in a continuous unrealized loss position:

	Less than Twelve Months					Twelve Months or More					Total
	Unrealized			Estimated		Unrealized			Estimated		Unrealized			Estimated
(dollars in thousands)	Losses			Fair Value		Losses			Fair Value		Losses			Fair Value
June 30, 2018
Government agency securities	$	—		$	—	$	(95	)	$	1,854	$	(95	)	$	1,854
Mortgage-backed securities
Government sponsored agencies		(1,097	)		28,642		(514	)		12,890		(1,611	)		41,532
Corporate debt securities		(164	)		9,586		(78	)		1,927		(242	)		11,513
Total available for sale	$	(1,261	)	$	38,228	$	(687	)	$	16,671	$	(1,948	)	$	54,899

Municipal securities	$	(163	)	$	4,653	$	—		$	—	$	(163	)	$	4,653
Total held to maturity	$	(163	)	$	4,653	$	—		$	—	$	(163	)	$	4,653

December 31, 2017
Government agency securities	$	(32	)	$	4,039	$	(120	)	$	3,777	$	(152	)	$	7,816
Mortgage-backed securities
Government sponsored agencies		(359	)		23,609		(249	)		11,887		(608	)		35,496
Corporate debt securities		(15	)		5,035		(33	)		1,972		(48	)		7,007
Total available for sale	$	(406	)	$	32,683	$	(402	)	$	17,636	$	(808	)	$	50,319

Municipal securities	$	(19	)	$	2,232	$	—		$	—	$	(19	)	$	2,232
Total held to maturity	$	(19	)	$	2,232	$	—		$	—	$	(19	)	$	2,232

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

6 Months Ended

Jun. 30, 2018

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 Los Angeles, Ventura and Orange County, California 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 June 30,
	2018									2017
(dollars in thousands)	Real Estate		Commercial		Unallocated			Total		Real Estate			Commercial			Unallocated		Total
Beginning balance	$	9,962	$	3,926	$	69		$	13,957	$	6,942		$	7,244		$	—	$	14,186
Additions (reductions) to the allowance charged to expense		530		174		(4	)		700		(509	)		(4,489	)		810		(4,188	)
Recoveries on loans charged-off		—		—		—			—		—			629			—		629
Less loans charged-off		—		—		—			—		—			—			—		—
Ending balance	$	10,492	$	4,100	$	65		$	14,657	$	6,433		$	3,384		$	810	$	10,627

	Six months ended June 30,
	2018									2017
(dollars in thousands)	Real Estate		Commercial		Unallocated			Total		Real Estate			Commercial			Unallocated		Total
Beginning balance	$	9,309	$	4,044	$	420		$	13,773	$	8,111		$	6,051		$	—	$	14,162
Additions (reductions) to the allowance charged to expense		1,183		56		(355	)		884		(1,678	)		(3,320	)		810		(4,188	)
Recoveries on loans charged-off		—		—		—			—		—			653			—		653
Less loans charged-off		—		—		—			—		—			—			—		—
Ending balance	$	10,492	$	4,100	$	65		$	14,657	$	6,433		$	3,384		$	810	$	10,627

The following table presents the recorded investment in loans and impairment method as of and for the six months ended June 30, 2018 and June 30, 2017, and the activity in the allowance for loan losses for the year ended December 31, 2017, by portfolio segment:

(dollars in thousands)
As of and for the six months ended June 30, 2018	Real Estate		Commercial		Unallocated		Total
Reserves:
Specific	$	—	$	—	$	—	$	—
General		10,492		4,100		65		14,657
Loans acquired with deteriorated credit quality		—		—		—		—
Total allowance for loan losses	$	10,492	$	4,100	$	65	$	14,657
Loans evaluated for impairment:
Individually	$	3,356	$	3,197	$	—	$	6,553
Collectively		872,088		405,130		—		1,277,218
Loans acquired with deteriorated credit quality		311		—		—		311
Total loans, net of deferred loan fees	$	875,755	$	408,327	$	—	$	1,284,082

As of and for the six months ended June 30, 2017	Real Estate		Commercial			Unallocated		Total
Reserves:
Specific	$	—	$	—		$	—	$	—
General		6,433		3,384			810		10,627
Loans acquired with deteriorated credit quality		—		—			—		—
Total allowance for loan losses	$	6,433	$	3,384		$	810	$	10,627
Loans evaluated for impairment:
Individually	$	4,843	$	3,638		$	—	$	8,481
Collectively		752,488		384,719			—		1,137,207
Loans acquired with deteriorated credit quality		317		—			—		317
Total loans, net of deferred loan fees	$	757,648	$	388,357		$	—	$	1,146,005

As of and for the year ended December 31, 2017	Real Estate		Commercial			Unallocated		Total
Allowance for loan losses:
Beginning of year	$	8,111	$	6,051		$	—	$	14,162
Provisions		1,198		(2,671	)		420		(1,053	)
Charge-offs		—		(83	)		—		(83	)
Recoveries		—		747			—		747
	$	9,309	$	4,044		$	420	$	13,773
Reserves:
Specific	$	—	$	—		$	—	$	—
General		9,309		4,044			420		13,773
Loans acquired with deteriorated credit quality		—		—			—		—
Total allowance for loan losses	$	9,309	$	4,044		$	420	$	13,773
Loans evaluated for impairment:
Individually	$	2,420	$	155		$	—	$	2,575
Collectively		834,152		412,032			—		1,246,184
Loans acquired with deteriorated credit quality		315		—			—		315
Total loans, net of deferred loan fees	$	836,887	$	412,187		$	—	$	1,249,074

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 June 30, 2018 and December 31, 2017:

(dollars in thousands)			Special
June 30, 2018	Pass		Mention		Substandard		Impaired		Total
Real estate:
Construction and land development	$	94,618	$	—	$	—	$	283	$	94,901
Commercial real estate		483,251		4,439		2,231		3,073		492,994
Single-family residential mortgages		287,860		—		—		—		287,860
Commercial:
Other		308,320		2,364		500		—		311,184
SBA		91,128		—		2,818		3,197		97,143
Total loan	$	1,265,177	$	6,803	$	5,549	$	6,553	$	1,284,082


December 31, 2017
Real estate:
Construction and land development	$	91,619	$	—	$	—	$	289	$	91,908
Commercial real estate		469,422		19,070		5,416		2,131		496,039
Single-family residential mortgages		248,940		—		—		—		248,940
Commercial:
Other		277,518		2,360		888		—		280,766
SBA		126,759		1,778		2,729		155		131,421
Total loan	$	1,214,258	$	23,208	$	9,033	$	2,575	$	1,249,074

As of June 30, 2018, there was no past due loan in single-family residential mortgages held for sale. The following table presents the aging of the recorded investment in past-due loans at June 30, 2018 and December 31, 2017 by class of loans:

(dollars in thousands)	30-59		60-89		90 Days		Total		Loans Not				Non- Accrual
June 30, 2018	Days		Days		Or More⁽²⁾		Past Due		Past Due		Total Loans		Loans⁽¹⁾
Real estate:
Construction and land development	$	—	$	—	$	—	$	—	$	94,901	$	94,901	$	—
Commercial real estate		—		—		—		—		492,994		492,994		—
Single-family residential mortgages		787		—		—		787		287,073		287,860		—
Commercial:
Other		277		—		—		277		310,907		311,184		—
SBA		—		—		2,173		2,173		94,970		97,143		2,173
	$	1,064	$	—	$	2,173	$	3,237	$	1,280,845	$	1,284,082	$	2,173

December 31, 2017
Real estate:
Construction and land development	$	—	$	—	$	—	$	—	$	91,908	$	91,908	$	—
Commercial real estate		—		—		—		—		496,039		496,039		—
Single-family residential mortgages		1,175		338		—		1,513		247,427		248,940		—
Commercial:
Other		—		—		—		—		280,766		280,766		—
SBA		—		1,426		84		1,510		129,911		131,421		155
	$	1,175	$	1,764	$	84	$	3,023	$	1,246,051	$	1,249,074	$	155
Real estate:
Single-family residential mortgages held for sale	$	697	$	—	$	—	$	697	$	125,150	$	125,847	$	—

(1)

Included in total loans.

(2)

As of June 30, 2018, there were no loans over 90 days past due and still accruing. As of December 31, 2017, there was one loan over 90 days past due and still accruing in the amount of $71,000.

Information relating to individually impaired loans presented by class of loans was as follows at June 30, 2018 and December 31, 2017:

	Unpaid
(dollars in thousands)	Principal		Recorded		Average		Interest		Related
June 30, 2018	Balance		Investment		Balance		Income		Allowance
With no related allowance recorded
Construction and land development	$	283	$	283	$	286	$	11	$	—
Commercial real estate		3,073		3,073		2,614		130		—
Commercial - SBA		3,197		3,197		1,712		88		—
Total	$	6,553	$	6,553	$	4,612	$	229	$	—


December 31, 2017
With no related allowance recorded
Construction and land development	$	289	$	289	$	296	$	16	$	—
Commercial real estate		2,131		2,131		2,192		297		—
Commercial - SBA		155		155		78		15		—
Total	$	2,575	$	2,575	$	2,566	$	328	$	—

No interest income was recognized on a cash basis for the six months ended June 30, 2018 and 2017 and for the year ended December 31, 2017.

The Company had six and four loans identified as troubled debt restructurings (“TDRs”) at June 30, 2018 and December 31, 2017, respectively. There were no specific reserves on TDRs as of June 30, 2018 or December 31, 2017. There are no commitments to lend additional amounts at June 30, 2018 and December 31, 2017 to customers with outstanding loans that are classified as TDRs.

As of June 30, 2018, the terms of two loans were modified as TDRs. The modification of the terms generally included loans where a moratorium on loan payments was granted. Such moratoriums ranged from six months to nine months on the loans restructured in 2018 and 2017.

The following table presents loans by class modified as TDRs that occurred during the six months ended June 30, 2018. There were three new TDRs as of June 30, 2018:

			Pre-		Post-
			Modification		Modification
(dollars in thousands)	Number of		Recorded		Recorded
June 30, 2018	Loans		Investment		Investment
Commercial		2	$	1,148	$	1,148
Commercial real estate		1		1,025		1,025
Total		3	$	2,173	$	2,173

The Company has purchased loans as part of its whole bank acquisitions, for which there was at acquisition, evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected.

The outstanding balance and carrying amount of purchased credit-impaired loans at June 30, 2018 and December 31, 2017 were as follows:

	June 30,		December 31,
(dollars in thousands)	2018		2017
Outstanding balance	$	316	$	322
Carrying amount	$	311	$	315

For these purchased credit-impaired loans, the Company did not increase the allowance for loan losses during the six months ended June 30, 2018 or for the year ended December 31, 2017, as there were no significant reductions in the expected cash flows.

Below is a summary of activity in the accretable yield on purchased credit-impaired loans for the six months ended June 30, 2018 and for the year ended December 31, 2017:

	June 30,			December 31,
(dollars in thousands)	2018			2017
Beginning balance	$	7		$	142
Accretion of income		(2	)		(135	)
Ending balance	$	5		$	7

- 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

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 and December 31, 2017 are as follows:

	June 30,		December 31,
(dollars in thousands)	2018		2017
Loans serviced for others:
Mortgage loans	$	432,990	$	384,437
SBA loans	$	177,264	$	175,919

The fair value of servicing assets for mortgage loans was $3.0 million and $2.5 million at June 30, 2018 and December 31, 2017, respectively. The fair value of servicing assets for SBA loans was $5.7 million and $5.9 million at June 30, 2018 and December 31, 2017, respectively.

Servicing fees net of servicing asset amortization totaled $27,000 and $257,000 for the six months ended June 30, 2018 and 2017, respectively. The decrease 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.

	Six months ended						Six months ended
	June 30, 2018						June 30, 2017
	Mortgage			SBA			Mortgage			SBA
(dollars in thousands)	Loans			Loans			Loans			Loans
Servicing assets:
Beginning of year	$	1,540		$	4,417		$	1,002		$	2,702
Additions		637			1,048			222			1,454
Disposals		(115	)		(736	)		(124	)		(185	)
Amortized to expense		(334	)		(323	)		(174	)		(236	)
End of period	$	1,728		$	4,406		$	926		$	3,735

Goodwill and Intangibles

6 Months Ended

Jun. 30, 2018

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 $29.9 million at June 30, 2018 and December 31, 2017, and is the only intangible asset with an indefinite life on the balance sheet. There were no impairment losses recognized on goodwill during the six months ended June 30, 2018 and 2017.

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 June 30, 2018 and December 31, 2017 was $1.3 million and $1.4 million, respectively. CDI amortization expense was $158,000 and $181,000 for the six months ended June 30, 2018 and June 30, 2017, respectively.

Estimated CDI amortization expense for future years is as follows:

(dollars in thousands)
Year ending December 31:
2018 remaining	$	153
2019		274
2020		244
2021		172
2022		129
Thereafter		308
Total	$	1,280

Deposits

6 Months Ended

Jun. 30, 2018

Maturities Of Time Deposits [Abstract]

Deposits

NOTE 8 - DEPOSITS

At June 30, 2018, the scheduled maturities of time deposits are as follows:

(dollars in thousands)	June 30, 2018		December 31, 2017
One year	$	680,534	$	627,665
Two to three years		13,249		12,263
Total	$	693,783	$	639,928

Long-term Debt

6 Months Ended

Jun. 30, 2018

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 subordinated debentures are considered Tier-two capital at the Company. The Company allocated $35 million to the Bank as Tier-one capital.

At June 30, 2018 and December 31, 2017, long-term debt was as follows:

	June 30,		December 31,
(dollars in thousands)	2018		2017
Principal	$	50,000	$	50,000
Unamortized debt issuance costs	$	399	$	472

Subordinated debentures	6 Months Ended
Subordinated debentures	Jun. 30, 2018
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 securities 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 as this Trust is a variable interest entity and 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 six months ended June 30, 2018 and 2017 was $45,000. 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 3.99% and 3.24% at June 30, 2018 and December 31, 2017, respectively.

Borrowing Arrangements	6 Months Ended
Borrowing Arrangements	Jun. 30, 2018
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 June 30, 2018, 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 June 30, 2018, 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 $14.0 million at June 30, 2018 is collateralized by loans pledged with a carrying value of $25.2 million. FHLB Secured Line of Credit. The secured borrowing capacity with the FHLB of $405.5 million at June 30, 2018 is collateralized by loans pledged with a carrying value of $464.0 million. At June 30, 2018, the Company had $40.0 million at 2.08% in short-term borrowings with the FHLB and $25.0 million at 1.41% at December 31, 2017. There were no amounts outstanding under any of the other borrowing arrangements above at June 30, 2018 and 2017 except FHLB advances.

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2018
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 six months ended June 30, 2018 and 2017, the Company recorded an income tax provision of $3.9 million and $9.8 million, respectively, reflecting an effective tax rate of 17.5% and 41.1% for the six months ended June 30, 2018 and 2017, respectively. During the three months ended June 30, 2018 and 2017, the Company recorded an income tax provision of $2.3 million and $5.9 million, respectively, reflecting and effective tax rate of 19.5% and 40.9% for the three months ended June 30, 2018 and 2017, respectively. These decreases in income tax expense was consistent with the reduction in the corporate income tax rate following passage of the Tax Cuts and Jobs Act of 2017 at the end of 2017 and a corresponding decrease in pre-tax income..

Commitments

6 Months Ended

Jun. 30, 2018

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 June 30, 2018:

(dollars in thousands)
Year ending December 31:
2018 remaining	$	1,086
2019		2,050
2020		1,794
2021		1,690
2022		1,447
Thereafter		5,346
Total	$	13,413

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 $895,000 and $742,000 for the six months ended June 30, 2018 and 2017, 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 June 30, 2018 and December 31, 2017, the Company had the following financial commitments whose contractual amount represents credit risk:

	June 30,		December 31,
(dollars in thousands)	2018		2017
Commitments to make loans	$	89,611	$	101,960
Unused lines of credit		98,809		99,217
Commercial and similar letters of credit		3,061		3,013
Standby letters of credit		1,795		1,575
Total	$	193,276	$	205,765

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

6 Months Ended

Jun. 30, 2018

Related Party Transactions

NOTE 14 - RELATED PARTY TRANSACTIONS

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

	June 30,			December 31,
(dollars in thousands)	2018			2017
Beginning balance	$	2,300		$	3,445
New loans and advances		2,300			2,200
Repayments		(1,100	)		(3,345	)
Ending balance	$	3,500		$	2,300

Loan commitments outstanding to executive officers, directors and their related interests with whom they are associated totaled approximately $0.5 million and $2.1 million at June 30, 2018 and December 31, 2017, respectively.

Deposits from principal officers, directors, and their affiliates at June 30, 2018 and December 31, 2017 were $45.0 million and $43.8 million, respectively.

Stock-based Compensation	6 Months Ended
Stock-based Compensation	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based Compensation	NOTE 15 - STOCK-BASED COMPENSATION RBB Bancorp 2017 Omnibus Stock Incentive Plan The 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 2017 OSIP, or 3,848,341 shares. This represents 23% of the issued and outstanding shares of the Company’s common stock as of June 30, 2018. As of June 30, 2018, there were 1,363,207 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. 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 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 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. The Company recognized stock-based compensation expense of $262,000 and $395,000 and recognized income tax benefits on that expense of $56,000 and $121,000 for the six months ended June 30, 2018 and 2017, respectively.

Regulatory Matters

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 is 11.14% and 12.54% 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 June 30, 2018 and December 31, 2017, that the Bank meets all capital adequacy requirements to which it is subject.

As defined in applicable regulations and set forth in the tables below, the 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			Regulatory Capital Ratio Requirements,			Under Prompt Corrective
	Actual			Capital Adequacy Purposes			including fully phased-in Capital Conservation Buffer			Provisions
(dollars in thousands)	Amount		Ratio	Amount		Ratio	Amount		Ratio	Amount		Ratio
As of June 30, 2018:
Tier 1 Leverage Ratio
Consolidated	$	260,042	15.23%	$	68,275	4.00%	$	68,275	4.00%	$	85,344	5.00%
Bank	$	252,675	14.84%	$	68,126	4.00%	$	68,126	4.00%	$	85,157	5.00%
Common Equity Tier 1 Risk-Based Capital Ratio
Consolidated	$	256,573	18.29%	$	63,114	4.50%	$	98,178	7.00%	$	91,165	6.50%
Bank	$	252,675	18.06%	$	62,963	4.50%	$	97,943	7.00%	$	90,947	6.50%
Tier 1 Risk-Based Capital Ratio
Consolidated	$	260,042	18.54%	$	84,152	6.00%	$	119,216	8.50%	$	112,203	8.00%
Bank	$	252,675	18.06%	$	83,951	6.00%	$	118,931	8.50%	$	111,935	8.00%
Total Risk-Based Capital Ratio
Consolidated	$	324,784	23.16%	$	112,203	8.00%	$	147,266	10.50%	$	140,254	10.00%
Bank	$	267,816	19.14%	$	111,935	8.00%	$	146,915	10.50%	$	139,919	10.00%

				Amount of Capital Required
										To Be Well-Capitalized
				Minimum Required for			Regulatory Capital Ratio Requirements,			Under Prompt Corrective
	Actual			Capital Adequacy Purposes			including fully phased-in Capital Conservation Buffer			Provisions
(dollars in thousands)	Amount		Ratio	Amount		Ratio	Amount		Ratio	Amount		Ratio
As of December 31, 2017:
Tier 1 Leverage Ratio
Consolidated	$	238,219	14.35%	$	66,423	4.00%	$	66,423	4.00%	$	83,029	5.00%
Bank	$	232,765	14.50%	$	64,214	4.00%	$	64,214	4.00%	$	80,267	5.00%
Common Equity Tier 1 Risk-Based Capital Ratio
Consolidated	$	234,794	17.54%	$	60,233	4.50%	$	93,696	7.00%	$	87,003	6.50%
Bank	$	232,765	17.42%	$	60,122	4.50%	$	93,524	7.00%	$	86,843	6.50%
Tier 1 Risk-Based Capital Ratio
Consolidated	$	238,219	17.80%	$	80,311	6.00%	$	113,774	8.50%	$	107,081	8.00%
Bank	$	232,765	17.42%	$	80,163	6.00%	$	113,564	8.50%	$	106,884	8.00%
Total Risk-Based Capital Ratio
Consolidated	$	301,802	22.55%	$	107,081	8.00%	$	140,544	10.50%	$	133,851	10.00%
Bank	$	246,820	18.47%	$	106,884	8.00%	$	140,285	10.50%	$	133,605	10.00%

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

6 Months Ended

Jun. 30, 2018

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 June 30, 2018.

The following table provides the hierarchy and fair value for each major category of assets and liabilities measured at fair value at June 30, 2018 and December 31, 2017:

(dollars in thousands)	Fair Value Measurements Using:
June 30, 2018	Level 1		Level 2		Level 3		Total
Assets measured at fair value:
On a recurring basis:
Securities available for sale
Government agency securities			$	1,854			$	1,854
Mortgage-backed securities								—
Government sponsored agencies				41,842				41,842
Corporate debt securities				17,603				17,603
	$	—	$	61,299	$	—	$	61,299

On a non-recurring basis:
Other real estate owned	$	—	$	—	$	293	$	293

December 31, 2017
Assets measured at fair value:
On a recurring basis:
Securities available for sale
Government agency securities			$	7,816				7,816
Mortgage-backed securities
Government sponsored agencies				39,215				39,215
Corporate debt securities				17,926				17,926
	$	—	$	64,957	$	—	$	64,957

On a non-recurring basis:
Other real estate owned	$	—	$	—	$	293	$	293

No write-downs to OREO were recorded in for the six months ended June 30, 2018 or for the year ended December 31, 2017.

Quantitative information about the Company's non-recurring Level 3 fair value measurements at June 30, 2018 and December 31, 2017 is as follows:

Weighted-

(dollars in thousands)

Fair Value

Valuation

Unobservable

Adjustment

Average

June 30, 2018

Amount

Technique

Input

Range

Adjustment

Other real estate owned

293

Third Party

Management Adjustments

21%

Appraisals

to Reflect Current

Conditions and Selling

Costs

December 31, 2017

Other real estate owned

293

Third Party

Management Adjustments

21%

Appraisals

to Reflect Current

Conditions and Selling

Costs

Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2018

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.

Fair value measurement and disclosure standards also establish a framework for measuring fair values. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability, in an orderly transaction between market participants on the measurement date. Further, the standards establish a fair value hierarchy that encourages an entity to maximize the use of observable inputs and limit the use of unobservable inputs when measuring fair values. The standards describe three levels of inputs that may be used to measure fair values:

•Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

•Level 2: Significant observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, and other inputs that are observable or can be corroborated by observable market data.

•Level 3: Significant unobservable inputs that reflect a company's own assumptions about the factors that market participants would likely consider in pricing an asset or liability.

Fair value estimates are made at a specific point in time based on relevant market data and information about the financial instruments. The estimates incorporate our assumptions with regard to the impact of prepayments on future cash flows and credit quality adjustments based on risk characteristics of various financial instruments, among other things. The estimates are subjective and involve uncertainties and matters of significant judgment, and therefore cannot be determined with precision. Changes in assumptions could significantly alter the fair values presented.

The fair value hierarchy level and estimated fair value of significant financial instruments at June 30, 2018 and December 31, 2017 are summarized as follows:

		June 30,				December 31,
		2018				2017
	Fair Value	Carrying		Fair		Carrying		Fair
(dollars in thousands)	Hierarchy	Value		Value		Value		Value
Financial Assets:
Cash and due from banks	Level 1	$	72,780	$	72,780	$	70,048	$	70,048
Federal funds sold and other cash equivalents	Level 1		—		—		80,000		80,000
Interest-earning deposits in other financial institutions	Level 1		600		600		600		600
Investment securities - AFS	Level 2		61,299		61,299		64,957		64,957
Investment securities - HTM	Level 2		9,986		9,982		10,009		10,250
Mortgage loans held for sale	Level 1		281,755		289,103		125,847		128,972
Loans, net	Level 3		1,269,425		1,326,775		1,235,301		1,236,289

Financial Liabilities:
Deposits	Level 2		1,424,406		1,423,802	$	1,337,281	$	1,336,353
FHLB advances	Level 2		40,000		40,000		25,000		25,000
Long-term debt	Level 2		49,601		42,457		49,528		44,319
Subordinated debentures	Level 3		3,470		3,861		3,424		3,348

- 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

6 Months Ended

Jun. 30, 2018

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”):

	Six months ended
	June 30,
	2018					2017
(dollars in thousands except per share amounts)	Income		Shares			Income		Shares
Net income as reported	$	18,283				$	14,029
Shares outstanding				16,544,627					12,827,803
Impact of weighting shares				(298,564	)				—
Used in basic EPS		18,283		16,246,063			14,029		12,827,803
Dilutive effect of outstanding
Stock options				1,002,062					970,672
Used in dilutive EPS	$	18,283		17,248,125		$	14,029		13,798,475

Basic earnings per common share	$	1.13				$	1.09
Diluted earnings per common share	$	1.06				$	1.02

	Three months ended
	June 30,
	2018					2017
(dollars in thousands except per share amounts)	Income		Shares			Income		Shares
Net income as reported	$	9,437				$	8,536
Shares outstanding				16,544,627					12,827,803
Impact of weighting shares				(137,188	)				—
Used in basic EPS		9,437		16,407,439			8,536		12,827,803
Dilutive effect of outstanding
Stock options				915,361					1,035,470
Used in dilutive EPS	$	9,437		17,322,800		$	8,536		13,863,273

Basic earnings per common share	$	0.58				$	0.67
Diluted earnings per common share	$	0.54				$	0.62

Qualified Affordable Housing Project Investments	6 Months Ended
Qualified Affordable Housing Project Investments	Jun. 30, 2018
Text Block [Abstract]
Qualified Affordable Housing Project Investments	NOTE 20 - QUALIFIED AFFORDABLE HOUSING PROJECT INVESTMENTS The Company began investing in qualified housing projects in 2016. At June 30, 2018 and December 31, 2017, the balance of the investment for qualified affordable housing projects was $9.8 million and $5.7 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 $8.1 million and $4.2 million at June 30, 2018 and December 31, 2017, respectively. The Company expects to fulfill these commitments during the years ending 2027 and 2028. For the six months ended June 30, 2018 and 2017, the Company recognized amortization expense of $322,000 and $119,000, respectively, which was included within income tax expense on the consolidated statements of income.

Recent Developments	6 Months Ended
Recent Developments	Jun. 30, 2018
Recent Developments [Abstract]
Recent Developments	NOTE 21 - RECENT DEVELOPMENTS On July 18, 2018, RBB declared a cash dividend of $0.09 per share for the second quarter of 2018. The dividend is payable on August 15, 2018 to common shareholders of record as of July 31, 2018. On April 23, 2018, RBB and FAIC entered into the Merger Agreement, providing for the merger of FAIC with and into RBB, with RBB as the surviving corporation (the Merger). Immediately following the effectiveness of the Merger, FAIB, a wholly-owned bank subsidiary of FAIC will be merged with and into the Bank, with the Bank being the surviving bank in the merger. See Item 1, Note 3 herein.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
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 six months ended June 30, 2018 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, 2017, included in our annual report filed on Form 10-K for the fiscal year ended December 31, 2017 (our “2017 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, 2017, included in our 2017 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 and six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ended December 31, 2018.
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 plans to adopt ASU 2014-09 as of January 1, 2019, utilizing the modified prospective approach. Company will perform an overall assessment of revenue streams potentially affected by the ASU, including certain deposit related fees and interchange fees, to determine the impact this guidance will have on our consolidated financial statements. 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. 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. Based upon an evaluation of the guidance in ASU 2016-01 the Company determined the ASU will not have a material impact on the Company’s consolidated financial statements as the accounting for other financial instruments, such as loans, investments in debt securities, and financial liabilities is largely unchanged. The Company adopted this ASU as of January 1, 2018 but will continue to monitor any updates to the guidance. 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, 2019. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718.) ASU 2016-09 includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. Under ASU 2016-09, excess tax benefits and certain tax deficiencies will no longer be recorded in additional paid-in capital (APIC). Instead, they will record all excess tax benefits and tax deficiencies as income tax expense or benefit in the income statement, and APIC pools will be eliminated. In addition, the guidance requires excess tax benefits be presented as an operating activity on the statement of cash flows rather than as a financing activity. ASU 2016-09 also permits an accounting policy election for the impact of forfeitures on the recognition of expense for share-based payment awards. Forfeitures can be estimated, as required today, or recognized when they occur. This guidance is effective for public business entities for interim and annual reporting periods beginning after December 15, 2016, and for nonpublic business entities annual reporting periods beginning after December 15, 2017, and interim periods within the reporting periods beginning after December 15, 2018. Early adoption is permitted, but all of the guidance must be adopted in the same period. The Company early adopted the ASU as of January 1, 2017. The Company plans to recognize forfeitures as they occur. The early adoption of the ASU did not have a material effect on the company’s financial statements or disclosures. 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 access 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 August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (Topic 230). The new guidance clarifies the classification within the statement of cash flows for certain transactions, including debt extinguishment costs, zero-coupon debt, contingent consideration related to business combinations, insurance proceeds, equity method distributions and beneficial interests in securitizations. The guidance also clarifies that cash flows with aspects of multiple classes of cash flows that cannot be separated by source or use should be classified based on the activity that is likely to be the predominant source or use of cash flows for the item. This guidance is effective for fiscal years beginning after December 15, 2017 and will require application using a retrospective transition method. The Company adopted this statement as of January 1, 2018. The Company believes the requirement to separately identify cash flows and application of the predominance principle is the cash flow item currently applicable to the consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. Currently, Topic 805 specifies three elements of a business – inputs, processes, and outputs. While an integrated set of assets and activities (collectively referred to as a “set”) that is a business usually has outputs, outputs are not required. In addition, all the inputs and processes that a seller uses in operating a set are not required if market participants can acquire the set and continue to produce outputs, for example, by integrating the acquired set with their own inputs and processes. This led many transactions to be accounted for as business combinations rather than asset purchases under legacy GAAP. The primary goal of ASU 2017-01 is to narrow the definition of a business, and the guidance in this update provides a screen to determine when a set is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. The amendments in this update are effective for public business entities for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The amendments in this update should be applied prospectively on or after the effective date. The Company adopted this ASU on January 1, 2018 and will be applied prospectively for any future business combinations. 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 access 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 codification 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. The Company does not expect this ASU to have a material impact on the Company’s consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” This Update allows a reclassification from accumulated other comprehensive income (“AOCI”) to retained earnings for stranded tax effects resulting from the new U.S. Federal corporate income tax rate enacted on December 22, 2017. The amendments in this Update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company elected to early adopt ASU 2018-02 and elected to reclassify the income tax effects of the Tax Reform Act from AOCI to retained earnings. The amount of the reclassification is $72,000, which is the difference between the historical corporate income tax rate and the newly enacted 21% corporate income tax rate. In February 2018, the FASB issued ASU 2018-03, “Technical Corrections and Improvements to Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.” The ASU clarifies certain aspects of the guidance issued in ASU 2016-01. There are two issues addressed that may affect RBB: (1) Equity Securities without a Readily Determinable Fair Value—Discontinuation, and (2) Equity Securities without a Readily Determinable Fair Value—Adjustments. Similar to ASU 2016-01, this ASU is generally effective for emerging growth company fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company will continue to assess the potential impact that this ASU will have 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.

Investment Securities (Tables)

6 Months Ended

Jun. 30, 2018

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
June 30, 2018	Cost		Gains		Losses			Value
Available for sale
Government agency securities	$	1,949	$	—	$	(95	)	$	1,854
Mortgage-backed securities
Government sponsored agencies		43,453		0		(1,611	)		41,842
Corporate debt securities		17,755		90		(242	)		17,603
Total	$	63,157	$	90	$	(1,948	)	$	61,299

Held to maturity
Municipal taxable securities	$	4,293	$	155	$	—		$	4,448
Municipal securities		5,693		4		(163	)		5,534
Total	$	9,986	$	159	$	(163	)	$	9,982

December 31, 2017
Available for sale
Government agency securities	$	7,968	$	—	$	(152	)	$	7,816
Mortgage-backed securities
Government sponsored agencies		39,806		17		(608	)		39,215
Corporate debt securities		17,813		161		(48	)		17,926
Total	$	65,587	$	178	$	(808	)	$	64,957

Held to maturity
Municipal taxable securities	$	4,295	$	228	$	—		$	4,523
Municipal securities		5,714		32		(19	)		5,727
Total	$	10,009	$	260	$	(19	)	$	10,250

Amortized Cost and Fair Value of Investment Securities Portfolio Expected Maturity

	Available for Sale				Held to Maturity
	Amortized		Fair		Amortized		Fair
(dollars in thousands)	Cost		Value		Cost		Value
Within one year	$	1,686	$	1,668	$	499	$	504
Due from one to five years		29,886		28,984		2,280		2,344
Due from five to ten years		27,548		26,702		2,390		2,481
Due from ten years and greater		4,037		3,945		4,817		4,653
Total	$	63,157	$	61,299	$	9,986	$	9,982

Summary of Available for Sale Securities With Unrealized Losses

	Less than Twelve Months					Twelve Months or More					Total
	Unrealized			Estimated		Unrealized			Estimated		Unrealized			Estimated
(dollars in thousands)	Losses			Fair Value		Losses			Fair Value		Losses			Fair Value
June 30, 2018
Government agency securities	$	—		$	—	$	(95	)	$	1,854	$	(95	)	$	1,854
Mortgage-backed securities
Government sponsored agencies		(1,097	)		28,642		(514	)		12,890		(1,611	)		41,532
Corporate debt securities		(164	)		9,586		(78	)		1,927		(242	)		11,513
Total available for sale	$	(1,261	)	$	38,228	$	(687	)	$	16,671	$	(1,948	)	$	54,899

Municipal securities	$	(163	)	$	4,653	$	—		$	—	$	(163	)	$	4,653
Total held to maturity	$	(163	)	$	4,653	$	—		$	—	$	(163	)	$	4,653

December 31, 2017
Government agency securities	$	(32	)	$	4,039	$	(120	)	$	3,777	$	(152	)	$	7,816
Mortgage-backed securities
Government sponsored agencies		(359	)		23,609		(249	)		11,887		(608	)		35,496
Corporate debt securities		(15	)		5,035		(33	)		1,972		(48	)		7,007
Total available for sale	$	(406	)	$	32,683	$	(402	)	$	17,636	$	(808	)	$	50,319

Municipal securities	$	(19	)	$	2,232	$	—		$	—	$	(19	)	$	2,232
Total held to maturity	$	(19	)	$	2,232	$	—		$	—	$	(19	)	$	2,232

Loans and Allowance for Loan Losses (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30,
	2018									2017
(dollars in thousands)	Real Estate		Commercial		Unallocated			Total		Real Estate			Commercial			Unallocated		Total
Beginning balance	$	9,962	$	3,926	$	69		$	13,957	$	6,942		$	7,244		$	—	$	14,186
Additions (reductions) to the allowance charged to expense		530		174		(4	)		700		(509	)		(4,489	)		810		(4,188	)
Recoveries on loans charged-off		—		—		—			—		—			629			—		629
Less loans charged-off		—		—		—			—		—			—			—		—
Ending balance	$	10,492	$	4,100	$	65		$	14,657	$	6,433		$	3,384		$	810	$	10,627

	Six months ended June 30,
	2018									2017
(dollars in thousands)	Real Estate		Commercial		Unallocated			Total		Real Estate			Commercial			Unallocated		Total
Beginning balance	$	9,309	$	4,044	$	420		$	13,773	$	8,111		$	6,051		$	—	$	14,162
Additions (reductions) to the allowance charged to expense		1,183		56		(355	)		884		(1,678	)		(3,320	)		810		(4,188	)
Recoveries on loans charged-off		—		—		—			—		—			653			—		653
Less loans charged-off		—		—		—			—		—			—			—		—
Ending balance	$	10,492	$	4,100	$	65		$	14,657	$	6,433		$	3,384		$	810	$	10,627

(dollars in thousands)
As of and for the six months ended June 30, 2018	Real Estate		Commercial		Unallocated		Total
Reserves:
Specific	$	—	$	—	$	—	$	—
General		10,492		4,100		65		14,657
Loans acquired with deteriorated credit quality		—		—		—		—
Total allowance for loan losses	$	10,492	$	4,100	$	65	$	14,657
Loans evaluated for impairment:
Individually	$	3,356	$	3,197	$	—	$	6,553
Collectively		872,088		405,130		—		1,277,218
Loans acquired with deteriorated credit quality		311		—		—		311
Total loans, net of deferred loan fees	$	875,755	$	408,327	$	—	$	1,284,082

As of and for the six months ended June 30, 2017	Real Estate		Commercial			Unallocated		Total
Reserves:
Specific	$	—	$	—		$	—	$	—
General		6,433		3,384			810		10,627
Loans acquired with deteriorated credit quality		—		—			—		—
Total allowance for loan losses	$	6,433	$	3,384		$	810	$	10,627
Loans evaluated for impairment:
Individually	$	4,843	$	3,638		$	—	$	8,481
Collectively		752,488		384,719			—		1,137,207
Loans acquired with deteriorated credit quality		317		—			—		317
Total loans, net of deferred loan fees	$	757,648	$	388,357		$	—	$	1,146,005

As of and for the year ended December 31, 2017	Real Estate		Commercial			Unallocated		Total
Allowance for loan losses:
Beginning of year	$	8,111	$	6,051		$	—	$	14,162
Provisions		1,198		(2,671	)		420		(1,053	)
Charge-offs		—		(83	)		—		(83	)
Recoveries		—		747			—		747
	$	9,309	$	4,044		$	420	$	13,773
Reserves:
Specific	$	—	$	—		$	—	$	—
General		9,309		4,044			420		13,773
Loans acquired with deteriorated credit quality		—		—			—		—
Total allowance for loan losses	$	9,309	$	4,044		$	420	$	13,773
Loans evaluated for impairment:
Individually	$	2,420	$	155		$	—	$	2,575
Collectively		834,152		412,032			—		1,246,184
Loans acquired with deteriorated credit quality		315		—			—		315
Total loans, net of deferred loan fees	$	836,887	$	412,187		$	—	$	1,249,074

Summary of Risk Category of Loans by Class of Loans

The risk category of loans by class of loans was as follows at June 30, 2018 and December 31, 2017:

(dollars in thousands)			Special
June 30, 2018	Pass		Mention		Substandard		Impaired		Total
Real estate:
Construction and land development	$	94,618	$	—	$	—	$	283	$	94,901
Commercial real estate		483,251		4,439		2,231		3,073		492,994
Single-family residential mortgages		287,860		—		—		—		287,860
Commercial:
Other		308,320		2,364		500		—		311,184
SBA		91,128		—		2,818		3,197		97,143
Total loan	$	1,265,177	$	6,803	$	5,549	$	6,553	$	1,284,082


December 31, 2017
Real estate:
Construction and land development	$	91,619	$	—	$	—	$	289	$	91,908
Commercial real estate		469,422		19,070		5,416		2,131		496,039
Single-family residential mortgages		248,940		—		—		—		248,940
Commercial:
Other		277,518		2,360		888		—		280,766
SBA		126,759		1,778		2,729		155		131,421
Total loan	$	1,214,258	$	23,208	$	9,033	$	2,575	$	1,249,074

Summary of Aging Recorded Investment Past-due Loans

The following table presents the aging of the recorded investment in past-due loans at June 30, 2018 and December 31, 2017 by class of loans:

(dollars in thousands)	30-59		60-89		90 Days		Total		Loans Not				Non- Accrual
June 30, 2018	Days		Days		Or More⁽²⁾		Past Due		Past Due		Total Loans		Loans⁽¹⁾
Real estate:
Construction and land development	$	—	$	—	$	—	$	—	$	94,901	$	94,901	$	—
Commercial real estate		—		—		—		—		492,994		492,994		—
Single-family residential mortgages		787		—		—		787		287,073		287,860		—
Commercial:
Other		277		—		—		277		310,907		311,184		—
SBA		—		—		2,173		2,173		94,970		97,143		2,173
	$	1,064	$	—	$	2,173	$	3,237	$	1,280,845	$	1,284,082	$	2,173

December 31, 2017
Real estate:
Construction and land development	$	—	$	—	$	—	$	—	$	91,908	$	91,908	$	—
Commercial real estate		—		—		—		—		496,039		496,039		—
Single-family residential mortgages		1,175		338		—		1,513		247,427		248,940		—
Commercial:
Other		—		—		—		—		280,766		280,766		—
SBA		—		1,426		84		1,510		129,911		131,421		155
	$	1,175	$	1,764	$	84	$	3,023	$	1,246,051	$	1,249,074	$	155
Real estate:
Single-family residential mortgages held for sale	$	697	$	—	$	—	$	697	$	125,150	$	125,847	$	—

(1)

Included in total loans.

(2)

As of June 30, 2018, there were no loans over 90 days past due and still accruing. As of December 31, 2017, there was one loan over 90 days past due and still accruing in the amount of $71,000.

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 June 30, 2018 and December 31, 2017:

	Unpaid
(dollars in thousands)	Principal		Recorded		Average		Interest		Related
June 30, 2018	Balance		Investment		Balance		Income		Allowance
With no related allowance recorded
Construction and land development	$	283	$	283	$	286	$	11	$	—
Commercial real estate		3,073		3,073		2,614		130		—
Commercial - SBA		3,197		3,197		1,712		88		—
Total	$	6,553	$	6,553	$	4,612	$	229	$	—


December 31, 2017
With no related allowance recorded
Construction and land development	$	289	$	289	$	296	$	16	$	—
Commercial real estate		2,131		2,131		2,192		297		—
Commercial - SBA		155		155		78		15		—
Total	$	2,575	$	2,575	$	2,566	$	328	$	—

Summary of Loans Class Modified as TDR's

The following table presents loans by class modified as TDRs that occurred during the six months ended June 30, 2018. There were three new TDRs as of June 30, 2018:

			Pre-		Post-
			Modification		Modification
(dollars in thousands)	Number of		Recorded		Recorded
June 30, 2018	Loans		Investment		Investment
Commercial		2	$	1,148	$	1,148
Commercial real estate		1		1,025		1,025
Total		3	$	2,173	$	2,173

Summary of Outstanding Balance and Carrying Amount of Purchased Credit-impaired Loans

The outstanding balance and carrying amount of purchased credit-impaired loans at June 30, 2018 and December 31, 2017 were as follows:

	June 30,		December 31,
(dollars in thousands)	2018		2017
Outstanding balance	$	316	$	322
Carrying amount	$	311	$	315

Summary of Activity in Accretable Yield on Purchased Credit-impaired Loans

Below is a summary of activity in the accretable yield on purchased credit-impaired loans for the six months ended June 30, 2018 and for the year ended December 31, 2017:

	June 30,			December 31,
(dollars in thousands)	2018			2017
Beginning balance	$	7		$	142
Accretion of income		(2	)		(135	)
Ending balance	$	5		$	7

Loan Servicing (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 and December 31, 2017 are as follows:

	June 30,		December 31,
(dollars in thousands)	2018		2017
Loans serviced for others:
Mortgage loans	$	432,990	$	384,437
SBA loans	$	177,264	$	175,919

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.

	Six months ended						Six months ended
	June 30, 2018						June 30, 2017
	Mortgage			SBA			Mortgage			SBA
(dollars in thousands)	Loans			Loans			Loans			Loans
Servicing assets:
Beginning of year	$	1,540		$	4,417		$	1,002		$	2,702
Additions		637			1,048			222			1,454
Disposals		(115	)		(736	)		(124	)		(185	)
Amortized to expense		(334	)		(323	)		(174	)		(236	)
End of period	$	1,728		$	4,406		$	926		$	3,735

Goodwill and Intangibles (Tables)

6 Months Ended

Jun. 30, 2018

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)
Year ending December 31:
2018 remaining	$	153
2019		274
2020		244
2021		172
2022		129
Thereafter		308
Total	$	1,280

Deposits (Tables)

6 Months Ended

Jun. 30, 2018

Maturities Of Time Deposits [Abstract]

Schedule of Maturities of Time Deposits

At June 30, 2018, the scheduled maturities of time deposits are as follows:

(dollars in thousands)	June 30, 2018		December 31, 2017
One year	$	680,534	$	627,665
Two to three years		13,249		12,263
Total	$	693,783	$	639,928

Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt

At June 30, 2018 and December 31, 2017, long-term debt was as follows:

	June 30,		December 31,
(dollars in thousands)	2018		2017
Principal	$	50,000	$	50,000
Unamortized debt issuance costs	$	399	$	472

- 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)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018:

(dollars in thousands)
Year ending December 31:
2018 remaining	$	1,086
2019		2,050
2020		1,794
2021		1,690
2022		1,447
Thereafter		5,346
Total	$	13,413

Schedule of Financial Commitments whose Contractual Amount Represents Credit Risk

At June 30, 2018 and December 31, 2017, the Company had the following financial commitments whose contractual amount represents credit risk:

	June 30,		December 31,
(dollars in thousands)	2018		2017
Commitments to make loans	$	89,611	$	101,960
Unused lines of credit		98,809		99,217
Commercial and similar letters of credit		3,061		3,013
Standby letters of credit		1,795		1,575
Total	$	193,276	$	205,765

Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Related Party Transactions

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

	June 30,			December 31,
(dollars in thousands)	2018			2017
Beginning balance	$	2,300		$	3,445
New loans and advances		2,300			2,200
Repayments		(1,100	)		(3,345	)
Ending balance	$	3,500		$	2,300

Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2018

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			Regulatory Capital Ratio Requirements,			Under Prompt Corrective
	Actual			Capital Adequacy Purposes			including fully phased-in Capital Conservation Buffer			Provisions
(dollars in thousands)	Amount		Ratio	Amount		Ratio	Amount		Ratio	Amount		Ratio
As of June 30, 2018:
Tier 1 Leverage Ratio
Consolidated	$	260,042	15.23%	$	68,275	4.00%	$	68,275	4.00%	$	85,344	5.00%
Bank	$	252,675	14.84%	$	68,126	4.00%	$	68,126	4.00%	$	85,157	5.00%
Common Equity Tier 1 Risk-Based Capital Ratio
Consolidated	$	256,573	18.29%	$	63,114	4.50%	$	98,178	7.00%	$	91,165	6.50%
Bank	$	252,675	18.06%	$	62,963	4.50%	$	97,943	7.00%	$	90,947	6.50%
Tier 1 Risk-Based Capital Ratio
Consolidated	$	260,042	18.54%	$	84,152	6.00%	$	119,216	8.50%	$	112,203	8.00%
Bank	$	252,675	18.06%	$	83,951	6.00%	$	118,931	8.50%	$	111,935	8.00%
Total Risk-Based Capital Ratio
Consolidated	$	324,784	23.16%	$	112,203	8.00%	$	147,266	10.50%	$	140,254	10.00%
Bank	$	267,816	19.14%	$	111,935	8.00%	$	146,915	10.50%	$	139,919	10.00%

				Amount of Capital Required
										To Be Well-Capitalized
				Minimum Required for			Regulatory Capital Ratio Requirements,			Under Prompt Corrective
	Actual			Capital Adequacy Purposes			including fully phased-in Capital Conservation Buffer			Provisions
(dollars in thousands)	Amount		Ratio	Amount		Ratio	Amount		Ratio	Amount		Ratio
As of December 31, 2017:
Tier 1 Leverage Ratio
Consolidated	$	238,219	14.35%	$	66,423	4.00%	$	66,423	4.00%	$	83,029	5.00%
Bank	$	232,765	14.50%	$	64,214	4.00%	$	64,214	4.00%	$	80,267	5.00%
Common Equity Tier 1 Risk-Based Capital Ratio
Consolidated	$	234,794	17.54%	$	60,233	4.50%	$	93,696	7.00%	$	87,003	6.50%
Bank	$	232,765	17.42%	$	60,122	4.50%	$	93,524	7.00%	$	86,843	6.50%
Tier 1 Risk-Based Capital Ratio
Consolidated	$	238,219	17.80%	$	80,311	6.00%	$	113,774	8.50%	$	107,081	8.00%
Bank	$	232,765	17.42%	$	80,163	6.00%	$	113,564	8.50%	$	106,884	8.00%
Total Risk-Based Capital Ratio
Consolidated	$	301,802	22.55%	$	107,081	8.00%	$	140,544	10.50%	$	133,851	10.00%
Bank	$	246,820	18.47%	$	106,884	8.00%	$	140,285	10.50%	$	133,605	10.00%

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 and December 31, 2017:

(dollars in thousands)	Fair Value Measurements Using:
June 30, 2018	Level 1		Level 2		Level 3		Total
Assets measured at fair value:
On a recurring basis:
Securities available for sale
Government agency securities			$	1,854			$	1,854
Mortgage-backed securities								—
Government sponsored agencies				41,842				41,842
Corporate debt securities				17,603				17,603
	$	—	$	61,299	$	—	$	61,299

On a non-recurring basis:
Other real estate owned	$	—	$	—	$	293	$	293

December 31, 2017
Assets measured at fair value:
On a recurring basis:
Securities available for sale
Government agency securities			$	7,816				7,816
Mortgage-backed securities
Government sponsored agencies				39,215				39,215
Corporate debt securities				17,926				17,926
	$	—	$	64,957	$	—	$	64,957

On a non-recurring basis:
Other real estate owned	$	—	$	—	$	293	$	293

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

Quantitative information about the Company's non-recurring Level 3 fair value measurements at June 30, 2018 and December 31, 2017 is as follows:

Weighted-

(dollars in thousands)

Fair Value

Valuation

Unobservable

Adjustment

Average

June 30, 2018

Amount

Technique

Input

Range

Adjustment

Other real estate owned

293

Third Party

Management Adjustments

21%

Appraisals

to Reflect Current

Conditions and Selling

Costs

December 31, 2017

Other real estate owned

293

Third Party

Management Adjustments

21%

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)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 and December 31, 2017 are summarized as follows:

		June 30,				December 31,
		2018				2017
	Fair Value	Carrying		Fair		Carrying		Fair
(dollars in thousands)	Hierarchy	Value		Value		Value		Value
Financial Assets:
Cash and due from banks	Level 1	$	72,780	$	72,780	$	70,048	$	70,048
Federal funds sold and other cash equivalents	Level 1		—		—		80,000		80,000
Interest-earning deposits in other financial institutions	Level 1		600		600		600		600
Investment securities - AFS	Level 2		61,299		61,299		64,957		64,957
Investment securities - HTM	Level 2		9,986		9,982		10,009		10,250
Mortgage loans held for sale	Level 1		281,755		289,103		125,847		128,972
Loans, net	Level 3		1,269,425		1,326,775		1,235,301		1,236,289

Financial Liabilities:
Deposits	Level 2		1,424,406		1,423,802	$	1,337,281	$	1,336,353
FHLB advances	Level 2		40,000		40,000		25,000		25,000
Long-term debt	Level 2		49,601		42,457		49,528		44,319
Subordinated debentures	Level 3		3,470		3,861		3,424		3,348

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

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”):

	Six months ended
	June 30,
	2018					2017
(dollars in thousands except per share amounts)	Income		Shares			Income		Shares
Net income as reported	$	18,283				$	14,029
Shares outstanding				16,544,627					12,827,803
Impact of weighting shares				(298,564	)				—
Used in basic EPS		18,283		16,246,063			14,029		12,827,803
Dilutive effect of outstanding
Stock options				1,002,062					970,672
Used in dilutive EPS	$	18,283		17,248,125		$	14,029		13,798,475

Basic earnings per common share	$	1.13				$	1.09
Diluted earnings per common share	$	1.06				$	1.02

	Three months ended
	June 30,
	2018					2017
(dollars in thousands except per share amounts)	Income		Shares			Income		Shares
Net income as reported	$	9,437				$	8,536
Shares outstanding				16,544,627					12,827,803
Impact of weighting shares				(137,188	)				—
Used in basic EPS		9,437		16,407,439			8,536		12,827,803
Dilutive effect of outstanding
Stock options				915,361					1,035,470
Used in dilutive EPS	$	9,437		17,322,800		$	8,536		13,863,273

Basic earnings per common share	$	0.58				$	0.67
Diluted earnings per common share	$	0.54				$	0.62

Business Description - Additional Information (Details) $ / shares in Units, $ in Thousands		55 Months Ended
	Jul. 31, 2017 $ / shares shares	Feb. 19, 2016 Acquisition	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Description Of Business [Line Items]
Total assets			$ 1,816,872	$ 1,691,059
Gross loans			1,284,082	1,249,074
Total deposits			1,424,406	1,337,281
Total stockholders' Equity			286,202	265,176	$ 192,337	$ 181,585
Number of acquisitions \| Acquisition		4
Common Stock
Description Of Business [Line Items]
Total stockholders' Equity			$ 214,025	$ 205,927	$ 142,651	$ 142,651
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

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	6 Months Ended
	Jun. 30, 2018 USD ($)
Business Description [Abstract]
Corporate income tax rate	21.00%
Reclassification of income tax effects of tax reform act from AOCI to retained earnings	$ 72,000

Acquisitions - Additional Information (Details) - USD ($)		3 Months Ended
	Apr. 23, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Common stock, par value
Merger Agreement \| First American International Corporation
Business Acquisition [Line Items]
Termination fee	$ 5,000,000
Merger Agreement \| Scenario Forecast \| First American International Corporation
Business Acquisition [Line Items]
Repurchase of outstanding preferred stock		$ 17,000,000
Convertible Common Stock \| Merger Agreement
Business Acquisition [Line Items]
Common stock shares issued	134.72%
Common stock, par value
Common stock purchase price, per share	15.30
Exercise price of common stock options excluded from share price	$ 51.00

Investment Securities - Summary of Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities - (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Available for sale, Amortized Cost	$ 63,157	$ 65,587
Available for sale, Gross Unrealized Gains	90	178
Available for sale, Gross Unrealized Losses	(1,948)	(808)
Available for sale, Fair Value	61,299	64,957
Held to maturity, Amortized Cost	9,986	10,009
Held to maturity, Gross Unrealized Gains	159	260
Held to maturity, Gross Unrealized Losses	(163)	(19)
Securities held to maturity, fair value	9,982	10,250
Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Available for sale, Amortized Cost	1,949	7,968
Available for sale, Gross Unrealized Losses	(95)	(152)
Available for sale, Fair Value	1,854	7,816
Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Available for sale, Amortized Cost	43,453	39,806
Available for sale, Gross Unrealized Gains	0	17
Available for sale, Gross Unrealized Losses	(1,611)	(608)
Available for sale, Fair Value	41,842	39,215
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available for sale, Amortized Cost	17,755	17,813
Available for sale, Gross Unrealized Gains	90	161
Available for sale, Gross Unrealized Losses	(242)	(48)
Available for sale, Fair Value	17,603	17,926
Municipal Taxable Securities
Schedule Of Available For Sale Securities [Line Items]
Held to maturity, Amortized Cost	4,293	4,295
Held to maturity, Gross Unrealized Gains	155	228
Securities held to maturity, fair value	4,448	4,523
Municipal Securities
Schedule Of Available For Sale Securities [Line Items]
Held to maturity, Amortized Cost	5,693	5,714
Held to maturity, Gross Unrealized Gains	4	32
Held to maturity, Gross Unrealized Losses	(163)	(19)
Securities held to maturity, fair value	$ 5,534	$ 5,727

Investment Securities - Additional Information (Details)	Jun. 30, 2018 USD ($) Security	Dec. 31, 2017 USD ($)
Investments Debt And Equity Securities [Abstract]
Number of investment securities pledged as collateral \| Security	1
Fair value of securities pledged to secure local agency deposit \| $	$ 729,000	$ 796,000

Investment Securities - Amortized Cost and Fair Value of Investment Securities Portfolio Expected Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Within one year, Available for sale, Amortized Cost	$ 1,686
Due from one to five years, Available for sale, Amortized Cost	29,886
Due from five to ten years, Available for sale, Amortized Cost	27,548
Due from ten years and greater, Available for sale, Amortized Cost	4,037
Available for sale, Amortized Cost	63,157	$ 65,587
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Within one year, Available for sale, Fair Value	1,668
Due from one to five years, Available for sale, Fair Value	28,984
Due from five to ten years, Available for sale, Fair Value	26,702
Due from ten years and greater, Available for sale, Fair Value	3,945
Available for sale, Fair value	61,299	64,957
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Within one year, Held to Maturity, Amortized Cost	499
Due from one to five years, Held to Maturity, Amortized Cost	2,280
Due from five to ten years, Held to Maturity, Amortized Cost	2,390
Due from ten years and greater, Held to Maturity, Amortized Cost	4,817
Held to maturity, Amortized Cost	9,986	10,009
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Within one year, Held to Maturity, Fair Value	504
Due from one to five years, Held to Maturity, Fair Value	2,344
Due from five to ten years, Held to Maturity, Fair Value	2,481
Due from ten years and greater, Held to Maturity, Fair Value	4,653
Held to Maturity, Fair Value	$ 9,982	$ 10,250

Investment Securities - Summary of Available for Sale Securities With Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Less than Twelve Months Unrealized Losses	$ (1,261)	$ (406)
Less than Twelve Months Estimated Fair Value	38,228	32,683
Twelve Months or More Unrealized Losses	(687)	(402)
Twelve Months or More Estimated Fair Value	16,671	17,636
Total Unrealized Losses	(1,948)	(808)
Total Estimated Fair Value	54,899	50,319
Held to maturity, Less than Twelve Months Unrealized Losses	(163)	(19)
Held to maturity, Less than Twelve Months Estimated Fair Value	4,653	2,232
Held to maturity, Total Unrealized Losses	(163)	(19)
Held to maturity, Total Estimated Fair Value	4,653	2,232
Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Less than Twelve Months Unrealized Losses		(32)
Less than Twelve Months Estimated Fair Value		4,039
Twelve Months or More Unrealized Losses	(95)	(120)
Twelve Months or More Estimated Fair Value	1,854	3,777
Total Unrealized Losses	(95)	(152)
Total Estimated Fair Value	1,854	7,816
Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Less than Twelve Months Unrealized Losses	(1,097)	(359)
Less than Twelve Months Estimated Fair Value	28,642	23,609
Twelve Months or More Unrealized Losses	(514)	(249)
Twelve Months or More Estimated Fair Value	12,890	11,887
Total Unrealized Losses	(1,611)	(608)
Total Estimated Fair Value	41,532	35,496
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Less than Twelve Months Unrealized Losses	(164)	(15)
Less than Twelve Months Estimated Fair Value	9,586	5,035
Twelve Months or More Unrealized Losses	(78)	(33)
Twelve Months or More Estimated Fair Value	1,927	1,972
Total Unrealized Losses	(242)	(48)
Total Estimated Fair Value	11,513	7,007
Municipal Securities
Schedule Of Available For Sale Securities [Line Items]
Held to maturity, Less than Twelve Months Unrealized Losses	(163)	(19)
Held to maturity, Less than Twelve Months Estimated Fair Value	4,653	2,232
Held to maturity, Total Unrealized Losses	(163)	(19)
Held to maturity, Total Estimated Fair Value	$ 4,653	$ 2,232

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		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	$ 13,957	$ 14,186	$ 13,773	$ 14,162	$ 14,162
Additions (reductions) to the allowance charged to expense	700	(4,188)	884	(4,188)
Recoveries on loans charged-off		629		653	747
Less loans charged-off					(83)
Allowance for loan losses, Ending balance	14,657	10,627	14,657	10,627	13,773
Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	9,962	6,942	9,309	8,111	8,111
Additions (reductions) to the allowance charged to expense	530	(509)	1,183	(1,678)
Allowance for loan losses, Ending balance	10,492	6,433	10,492	6,433	9,309
Commercial
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	3,926	7,244	4,044	6,051	6,051
Additions (reductions) to the allowance charged to expense	174	(4,489)	56	(3,320)
Recoveries on loans charged-off		629		653	747
Less loans charged-off					(83)
Allowance for loan losses, Ending balance	4,100	3,384	4,100	3,384	4,044
Unallocated
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, Beginning balance	69		420
Additions (reductions) to the allowance charged to expense	(4)	810	(355)	810
Allowance for loan losses, Ending balance	$ 65	$ 810	$ 65	$ 810	$ 420

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		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Reserves:
Loan losses, Reserves	$ 14,657	$ 10,627	$ 14,657	$ 10,627	$ 13,773
Loans evaluated for impairment:
Loans, Individually evaluated for impairment	6,553	8,481	6,553	8,481	2,575
Loans, Collectively evaluated for impairment	1,277,218	1,137,207	1,277,218	1,137,207	1,246,184
Total loans, net of deferred loan fees	1,284,082	1,146,005	1,284,082	1,146,005	1,249,074
Allowance for loan losses:
Allowance for loan losses, Beginning balance	13,957	14,186	13,773	14,162	14,162
Allowance for loan losses, Provisions	700	(4,188)	884	(4,188)	(1,053)
Allowance for loan losses, Charge-offs					(83)
Allowance for loan losses, Recoveries		629		653	747
Allowance for loan losses, Ending balance	14,657	10,627	14,657	10,627	13,773
Loans Acquired with Deteriorated Credit Quality
Loans evaluated for impairment:
Loans acquired	311	317	311	317	315
General Reserves
Reserves:
Loan losses, Reserves	14,657	10,627	14,657	10,627	13,773
Real Estate
Reserves:
Loan losses, Reserves	10,492	6,433	10,492	6,433	9,309
Loans evaluated for impairment:
Loans, Individually evaluated for impairment	3,356	4,843	3,356	4,843	2,420
Loans, Collectively evaluated for impairment	872,088	752,488	872,088	752,488	834,152
Total loans, net of deferred loan fees	875,755	757,648	875,755	757,648	836,887
Allowance for loan losses:
Allowance for loan losses, Beginning balance	9,962	6,942	9,309	8,111	8,111
Allowance for loan losses, Provisions					1,198
Allowance for loan losses, Ending balance	10,492	6,433	10,492	6,433	9,309
Real Estate \| Loans Acquired with Deteriorated Credit Quality
Loans evaluated for impairment:
Loans acquired	311	317	311	317	315
Real Estate \| General Reserves
Reserves:
Loan losses, Reserves	10,492	6,433	10,492	6,433	9,309
Commercial
Reserves:
Loan losses, Reserves	4,100	3,384	4,100	3,384	4,044
Loans evaluated for impairment:
Loans, Individually evaluated for impairment	3,197	3,638	3,197	3,638	155
Loans, Collectively evaluated for impairment	405,130	384,719	405,130	384,719	412,032
Total loans, net of deferred loan fees	408,327	388,357	408,327	388,357	412,187
Allowance for loan losses:
Allowance for loan losses, Beginning balance	3,926	7,244	4,044	6,051	6,051
Allowance for loan losses, Provisions					(2,671)
Allowance for loan losses, Charge-offs					(83)
Allowance for loan losses, Recoveries		629		653	747
Allowance for loan losses, Ending balance	4,100	3,384	4,100	3,384	4,044
Commercial \| General Reserves
Reserves:
Loan losses, Reserves	4,100	3,384	4,100	3,384	4,044
Unallocated
Reserves:
Loan losses, Reserves	65	810	65	810	420
Allowance for loan losses:
Allowance for loan losses, Beginning balance	69		420
Allowance for loan losses, Provisions					420
Allowance for loan losses, Ending balance	65	810	65	810	420
Unallocated \| General Reserves
Reserves:
Loan losses, Reserves	$ 65	$ 810	$ 65	$ 810	$ 420

Loans and Allowance for Loan Losses - Summary of Risk Category of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Total loan	$ 1,284,082	$ 1,249,074
Real Estate \| Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loan	94,901	91,908
Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan	492,994	496,039
Real Estate \| Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loan	287,860	248,940
Commercial \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loan	311,184	280,766
Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loan	97,143	131,421
Pass
Accounts Notes And Loans Receivable [Line Items]
Total loan	1,265,177	1,214,258
Pass \| Real Estate \| Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loan	94,618	91,619
Pass \| Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan	483,251	469,422
Pass \| Real Estate \| Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loan	287,860	248,940
Pass \| Commercial \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loan	308,320	277,518
Pass \| Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loan	91,128	126,759
Special Mention
Accounts Notes And Loans Receivable [Line Items]
Total loan	6,803	23,208
Special Mention \| Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan	4,439	19,070
Special Mention \| Commercial \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loan	2,364	2,360
Special Mention \| Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loan		1,778
Substandard
Accounts Notes And Loans Receivable [Line Items]
Total loan	5,549	9,033
Substandard \| Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan	2,231	5,416
Substandard \| Commercial \| Other
Accounts Notes And Loans Receivable [Line Items]
Total loan	500	888
Substandard \| Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loan	2,818	2,729
Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loan	6,553	2,575
Impaired \| Real Estate \| Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loan	283	289
Impaired \| Real Estate \| Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loan	3,073	2,131
Impaired \| Commercial \| SBA
Accounts Notes And Loans Receivable [Line Items]
Total loan	$ 3,197	$ 155

Loans and Allowance for Loan Losses - Additional Information (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) Loan	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Loan
Financing Receivable Recorded Investment [Line Items]
Past due loan	$ 3,237,000		$ 3,023,000
Interest income recognized on cash basis	$ 0	$ 0	$ 0
Number of loans identified as troubled debt restructurings \| Loan	6		4
Specific reserve	$ 14,657,000	10,627,000	$ 13,773,000
Commitments to lend an additional amounts of outstanding loans are classified as TDRs	$ 0		0
Description of loans modified as troubled debt restructuring	As of June 30, 2018, the terms of two loans were modified as TDRs. The modification of the terms generally included loans where a moratorium on loan payments was granted. Such moratoriums ranged from six months to nine months on the loans restructured in 2018 and 2017.
Financing receivable modified as TDR's \| Loan	3
Increase in allowance for loan losses under purchased credit-impaired loans	$ 0		0
Significant reductions in allowance for loan losses under purchased credit-impaired loans	$ 0		0
Minimum
Financing Receivable Recorded Investment [Line Items]
Moratorium on loan payments period granted	6 months
Maximum
Financing Receivable Recorded Investment [Line Items]
Moratorium on loan payments period granted	9 months
One Loan
Financing Receivable Recorded Investment [Line Items]
Specific reserve	$ 0		0
Real Estate
Financing Receivable Recorded Investment [Line Items]
Specific reserve	$ 10,492,000	$ 6,433,000	9,309,000
Financing receivable modified as TDR's \| Loan	1
Real Estate \| Single-Family Residential Mortgages Loans Held For Sale
Financing Receivable Recorded Investment [Line Items]
Past due loan	$ 0		$ 697,000

Loans and Allowance for Loan Losses - Summary of Aging Recorded Investment Past-due Loans (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 3,237,000	$ 3,023,000
Loans Not Past Due	1,280,845,000	1,246,051,000
Total Loans	1,284,082,000	1,249,074,000
Non- Accrual Loans	2,173,000	155,000
Real Estate \| Construction and Land Development
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	94,901,000	91,908,000
Total Loans	94,901,000	91,908,000
Real Estate \| Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Loans Not Past Due	492,994,000	496,039,000
Total Loans	492,994,000	496,039,000
Real Estate \| Single-family Residential Mortgages
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	787,000	1,513,000
Loans Not Past Due	287,073,000	247,427,000
Total Loans	287,860,000	248,940,000
Real Estate \| Single Family Residential Mortgages Loans Held For Sale
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	0	697,000
Loans Not Past Due		125,150,000
Total Loans		125,847,000
Commercial \| Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	277,000
Loans Not Past Due	310,907,000	280,766,000
Total Loans	311,184,000	280,766,000
Commercial \| SBA
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,173,000	1,510,000
Loans Not Past Due	94,970,000	129,911,000
Total Loans	97,143,000	131,421,000
Non- Accrual Loans	2,173,000	155,000
30-59 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,064,000	1,175,000
30-59 Days \| Real Estate \| Single-family Residential Mortgages
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	787,000	1,175,000
30-59 Days \| Real Estate \| Single Family Residential Mortgages Loans Held For Sale
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		697,000
30-59 Days \| Commercial \| Other
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	277,000
60-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		1,764,000
60-89 Days \| Real Estate \| Single-family Residential Mortgages
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		338,000
60-89 Days \| Commercial \| SBA
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		1,426,000
90 Days Or More
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,173,000	84,000
90 Days Or More \| Commercial \| SBA
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 2,173,000	$ 84,000

Loans and Allowance for Loan Losses - Summary of Aging Recorded Investment Past-due Loans (Parenthetical) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
90 Days Or More
Financing Receivable Recorded Investment [Line Items]
Loan over 90 days past due and still accruing	$ 0	$ 71,000

Loans and Allowance for Loan Losses - Summary of Individually Impaired Loans Presented by Class of Loans (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance, With no related allowance recorded	$ 6,553	$ 2,575
Recorded Investment, With no related allowance recorded	6,553	2,575
Average Balance, With no related allowance recorded	4,612	2,566
Interest Income, With no related allowance recorded	229	328
Construction and Land Development
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance, With no related allowance recorded	283	289
Recorded Investment, With no related allowance recorded	283	289
Average Balance, With no related allowance recorded	286	296
Interest Income, With no related allowance recorded	11	16
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance, With no related allowance recorded	3,073	2,131
Recorded Investment, With no related allowance recorded	3,073	2,131
Average Balance, With no related allowance recorded	2,614	2,192
Interest Income, With no related allowance recorded	130	297
Commercial \| SBA
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance, With no related allowance recorded	3,197	155
Recorded Investment, With no related allowance recorded	3,197	155
Average Balance, With no related allowance recorded	1,712	78
Interest Income, With no related allowance recorded	$ 88	$ 15

Loans and Allowance for Loan Losses - Summary of Loans Class Modified as TDR's (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) Loan
Financing Receivable Recorded Investment [Line Items]
Number of Loans \| Loan	3
Pre-Modification Recorded Investment	$ 2,173
Post-Modification Recorded Investment	$ 2,173
Commercial
Financing Receivable Recorded Investment [Line Items]
Number of Loans \| Loan	2
Pre-Modification Recorded Investment	$ 1,148
Post-Modification Recorded Investment	$ 1,148
Commercial Real Estate
Financing Receivable Recorded Investment [Line Items]
Number of Loans \| Loan	1
Pre-Modification Recorded Investment	$ 1,025
Post-Modification Recorded Investment	$ 1,025

Loans and Allowance for Loan Losses - Summary of Outstanding Balance and Carrying Amount of Purchased Credit-impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Outstanding balance	$ 316	$ 322
Carrying amount	$ 311	$ 315

Loans and Allowance for Loan Losses - Summary of Activity in Accretable Yield on Purchased Credit-impaired Loans (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Beginning balance	$ 7	$ 142
Accretion of income	(2)	(135)
Ending balance	$ 5	$ 7

Loan Servicing- Schedule of Principal Balances of Mortgage and SBA Loans Serviced for Others (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Mortgage Loans
Schedule Of Mortgage And Small Business Administration Loans Serviced [Line Items]
Loans serviced for others	$ 432,990	$ 384,437
SBA Loans
Schedule Of Mortgage And Small Business Administration Loans Serviced [Line Items]
Loans serviced for others	$ 177,264	$ 175,919

Loan Servicing - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	$ 6,134		$ 6,134		$ 5,957
Servicing fees net of servicing asset amortization	58	$ (5)	27	$ 257
Mortgage Loans
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	3,000		3,000		2,500
SBA Loans
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	$ 5,700		$ 5,700		$ 5,900

Loan Servicing - Schedule of Amortization of Mortgage Servicing Rights Netted Against Loan Servicing Fee Income (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Mortgage Loans
Servicing assets:
Beginning of year	$ 1,540	$ 1,002
Additions	637	222
Disposals	(115)	(124)
Amortized to expense	(334)	(174)
End of period	1,728	926
SBA
Servicing assets:
Beginning of year	4,417	2,702
Additions	1,048	1,454
Disposals	(736)	(185)
Amortized to expense	(323)	(236)
End of period	$ 4,406	$ 3,735

Goodwill and Intangibles - Additional information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]
Goodwill	$ 29,940,000		$ 29,940,000		$ 29,940,000
Impairment losses recognized on goodwill			0	$ 0
Amortization of intangibles	77,000	$ 87,000	158,000	181,000
Core Deposit Intangible
Schedule Of Finite Lived Intangible Assets And Goodwill [Line Items]
Unamortized balance of intangible assets	$ 1,300,000		1,300,000		$ 1,400,000
Amortization of intangibles			$ 158,000	$ 181,000
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	Jun. 30, 2018 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2018 remaining	$ 153
2019	274
2020	244
2021	172
2022	129
Thereafter	308
Total	$ 1,280

Deposits - Schedule of Maturities of Time Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Maturities Of Time Deposits [Abstract]
One year	$ 680,534	$ 627,665
Two to three years	13,249	12,263
Total	$ 693,783	$ 639,928

Long-term Debt - Additional Information (Details) - USD ($)	1 Months Ended	6 Months Ended
	Mar. 31, 2016	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt instrument, face amount		$ 50,000,000	$ 50,000,000
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

Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Debt Instruments [Abstract]
Principal	$ 50,000,000	$ 50,000,000
Unamortized debt issuance costs	$ 399,000	$ 472,000

Subordinated Debentures - Additional Information (Details) - USD ($)			6 Months Ended
	Feb. 19, 2016	Mar. 15, 2012	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Debt instrument, face amount			$ 50,000,000		$ 50,000,000
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 3.99% and 3.24% at June 30, 2018 and December 31, 2017
Debt instrument interest percentage			3.99%		3.24%
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			45,000	$ 45,000
TFC Statutory Trust \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Subordinated debenture liability	$ 3,300,000
Other Assets
Debt Instrument [Line Items]
Investment in common stock			$ 155,000
London Interbank Offered Rate \| Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, basis points			1.65%

Borrowing Arrangements - Additional Information (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Debt Instrument [Line Items]
Line of credit amount outstanding	$ 0		$ 0
FRB Secured Line of Credit
Debt Instrument [Line Items]
Secured borrowing capacity	14,000,000
Carrying value of collateral loan pledged	25,200,000
FHLB Secured Line of Credit
Debt Instrument [Line Items]
Secured borrowing capacity	405,500,000
Carrying value of collateral loan pledged	464,000,000
FHLB
Debt Instrument [Line Items]
Short-term borrowings	$ 40,000,000	$ 25,000,000
Short-term borrowings interest percentage	2.08%	1.41%
Zions Bank \| Maximum
Debt Instrument [Line Items]
Borrowings of unsecured loan	$ 20,000,000
Wells Fargo Bank \| Letter of Credit
Debt Instrument [Line Items]
Borrowings of unsecured loan	2,000,000
Wells Fargo Bank \| Maximum
Debt Instrument [Line Items]
Borrowings of unsecured loan	10,000,000
First Tennessee National Bank \| Maximum
Debt Instrument [Line Items]
Borrowings of unsecured loan	12,000,000
Pacific Coast Bankers' Bank \| Maximum
Debt Instrument [Line Items]
Borrowings of unsecured loan	$ 5,000,000

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 2,292	$ 5,901	$ 3,872	$ 9,776
Effective tax rate	19.50%	40.90%	17.50%	41.10%

Commitments - Schedule of Future Minimum Rent Payments on Company's Leases (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2018 remaining	$ 1,086
2019	2,050
2020	1,794
2021	1,690
2022	1,447
Thereafter	5,346
Total	$ 13,413

Commitments - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Total rental expense, recognized on straight-line basis	$ 895,000	$ 742,000

Commitments - Schedule of Financial Commitments whose Contractual Amount Represents Credit Risk (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Financial commitments, contractual amount	$ 193,276	$ 205,765
Commitments to Make Loans
Loss Contingencies [Line Items]
Financial commitments, contractual amount	89,611	101,960
Unused Lines of Credit
Loss Contingencies [Line Items]
Financial commitments, contractual amount	98,809	99,217
Commercial and Similar Letters of Credit
Loss Contingencies [Line Items]
Financial commitments, contractual amount	3,061	3,013
Standby Letters of Credit
Loss Contingencies [Line Items]
Financial commitments, contractual amount	$ 1,795	$ 1,575

Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Related Party Transactions [Abstract]
Beginning balance	$ 2,300	$ 3,445
New loans and advances	2,300	2,200
Repayments	(1,100)	(3,345)
Ending balance	$ 3,500	$ 2,300

Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Executive Officers, Directors and their Related Interests
Related Party Transaction [Line Items]
Due to related parties	$ 0.5	$ 2.1
Principal Officers, Directors and their Affiliates
Related Party Transaction [Line Items]
Deposits from related parties	$ 45.0	$ 43.8

Stock-based Compensation - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jan. 18, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 262,000	$ 395,000
Income tax benefits recognized	$ 56,000	$ 121,000
Omnibus Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of number of shares of common stock issued and outstanding	23.00%
Common stock reserved for issuance			3,848,341
Available for issuance of common stock	1,363,207
Maximum \| Omnibus Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved as percentage of issued and outstanding shares			30.00%
Maximum \| 2010 Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved as percentage of issued and outstanding shares	30.00%
Common stock reserved for issuance	3,494,478
Additional shares of common stock available for grant	0

Regulatory Matters - Additional Information (Details) - USD ($)						6 Months Ended
	Jan. 01, 2019	Jan. 01, 2018	Jan. 02, 2017	Jan. 02, 2016	Jan. 01, 2015	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
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%	0.625%	2.50%
Capital conservation buffer phased-in on pro rata basis period				4 years
Scenario Forecast
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer	2.50%
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						11.14%
RBB Bancorp
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						12.54%
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	Jun. 30, 2018	Dec. 31, 2017	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	$ 260,042	$ 238,219
Tier 1 Leverage Ratio, Ratio	15.23%	14.35%
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 68,275	$ 66,423
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 Leverage Ratio, Capital Ratio Requirements including Fully Phased in Capital Conservation Buffer, Amount	$ 68,275	$ 66,423
Tier 1 Leverage Ratio, Capital Ratio Requirements including Fully Phased in Capital Conservation Buffer, Ratio	4.00%	4.00%
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 85,344	$ 83,029
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	$ 256,573	$ 234,794
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio	18.29%	17.54%
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 63,114	$ 60,233
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, Regulatory Capital Ratio Requirement including Capital Conservation Buffer, Amount	$ 98,178	$ 93,696
Common Equity Tier 1 Risk-Based Capital Ratio, Regulatory Capital Ratio Requirement including Capital Conservation Buffer, Ratio	7.00%	7.00%
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 91,165	$ 87,003
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	$ 260,042	$ 238,219
Tier 1 Risk-Based Capital Ratio, Ratio	18.54%	17.80%
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 84,152	$ 80,311
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	6.00%	6.00%
Tier 1 Risk-Based Capital Ratio Regulatory Capital Ratio Requirements, including fully phased-in Capital Conservation Buffer Amount	$ 119,216	$ 113,774
Tier 1 Risk-Based Capital Ratio Regulatory Capital Ratio Requirements, including fully phased-in Capital Conservation Buffer Ratio	8.50%	8.50%
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 112,203	$ 107,081
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	$ 324,784	$ 301,802
Total Risk-Based Capital Ratio, Ratio	23.16%	22.55%
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 112,203	$ 107,081
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	8.00%	8.00%
Total Risk-Based Capital Ratio Regulatory Capital Ratio Requirements, including fully phased-in Capital Conservation Buffer Amount	$ 147,266	$ 140,544
Total Risk-Based Capital Ratio Regulatory Capital Ratio Requirements, including fully phased-in Capital Conservation Buffer Ratio	10.50%	10.50%
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 140,254	$ 133,851
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio	10.00%	10.00%
Royal Business Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 Leverage Ratio, Amount	$ 252,675	$ 232,765
Tier 1 Leverage Ratio, Ratio	14.84%	14.50%
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 68,126	$ 64,214
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 Leverage Ratio, Capital Ratio Requirements including Fully Phased in Capital Conservation Buffer, Amount	$ 68,126	$ 64,214
Tier 1 Leverage Ratio, Capital Ratio Requirements including Fully Phased in Capital Conservation Buffer, Ratio	4.00%	4.00%
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 85,157	$ 80,267
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	$ 252,675	$ 232,765
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio	18.06%	17.42%
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 62,963	$ 60,122
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, Regulatory Capital Ratio Requirement including Capital Conservation Buffer, Amount	$ 97,943	$ 93,524
Common Equity Tier 1 Risk-Based Capital Ratio, Regulatory Capital Ratio Requirement including Capital Conservation Buffer, Ratio	7.00%	7.00%
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 90,947	$ 86,843
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	$ 252,675	$ 232,765
Tier 1 Risk-Based Capital Ratio, Ratio	18.06%	17.42%
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 83,951	$ 80,163
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	6.00%	6.00%
Tier 1 Risk-Based Capital Ratio Regulatory Capital Ratio Requirements, including fully phased-in Capital Conservation Buffer Amount	$ 118,931	$ 113,564
Tier 1 Risk-Based Capital Ratio Regulatory Capital Ratio Requirements, including fully phased-in Capital Conservation Buffer Ratio	8.50%	8.50%
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 111,935	$ 106,884
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	$ 267,816	$ 246,820
Total Risk-Based Capital Ratio, Ratio	19.14%	18.47%
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 111,935	$ 106,884
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio	8.00%	8.00%
Total Risk-Based Capital Ratio Regulatory Capital Ratio Requirements, including fully phased-in Capital Conservation Buffer Amount	$ 146,915	$ 140,285
Total Risk-Based Capital Ratio Regulatory Capital Ratio Requirements, including fully phased-in Capital Conservation Buffer Ratio	10.50%	10.50%
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount	$ 139,919	$ 133,605
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	Jun. 30, 2018	Dec. 31, 2017
Fair Value Measurements, Recurring Basis
Assets measured at fair value:
Assets measured at fair value	$ 61,299	$ 64,957
Fair Value Measurements, Recurring Basis \| Government Agency Securities
Assets measured at fair value:
Assets measured at fair value	1,854	7,816
Fair Value Measurements, Recurring Basis \| Government Sponsored Agencies
Assets measured at fair value:
Assets measured at fair value	41,842	39,215
Fair Value Measurements, Recurring Basis \| Corporate Debt Securities
Assets measured at fair value:
Assets measured at fair value	17,603	17,926
Fair Value Measurements, Nonrecurring Basis \| Other Real Estate Owned
Assets measured at fair value:
Assets measured at fair value	293	293
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis
Assets measured at fair value:
Assets measured at fair value	61,299	64,957
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis \| Government Agency Securities
Assets measured at fair value:
Assets measured at fair value	1,854	7,816
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis \| Government Sponsored Agencies
Assets measured at fair value:
Assets measured at fair value	41,842	39,215
Fair Value Measurements Using Level 2 \| Fair Value Measurements, Recurring Basis \| Corporate Debt Securities
Assets measured at fair value:
Assets measured at fair value	17,603	17,926
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	$ 293	$ 293

Fair Value Measurements - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Write-downs to OREO	$ 0	$ 0

Fair Value Measurements - Summary of Quantitative Information About Non-recurring Level 3 Fair Value Measurements (Details) - Other Real Estate Owned $ in Thousands	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value Measurements, Nonrecurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value Amount	$ 293	$ 293
Level 3 \| Fair Value Measurements, Nonrecurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value Amount	$ 293	$ 293
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	21	21
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	21	21
Level 3 \| Third Party Appraisals \| Fair Value Measurements, Nonrecurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value Amount	$ 293	$ 293

Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Level and Estimated Fair Value of Significant Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financial Assets:
Investment securities - AFS	$ 61,299	$ 64,957
Investment securities - HTM	9,982	10,250
Carrying Value
Financial Assets:
Cash and due from banks	72,780	70,048
Federal funds sold and other cash equivalents		80,000
Interest-earning deposits in other financial institutions	600	600
Investment securities - AFS	61,299	64,957
Investment securities - HTM	9,986	10,009
Mortgage loans held for sale	281,755	125,847
Loans, net	1,269,425	1,235,301
Financial Liabilities:
Deposits	1,424,406	1,337,281
FHLB advances	40,000	25,000
Long-term debt	49,601	49,528
Subordinated debenture liability	3,470	3,424
Fair Value \| Fair Value, Inputs, Level 1
Financial Assets:
Cash and due from banks	72,780	70,048
Federal funds sold and other cash equivalents		80,000
Interest-earning deposits in other financial institutions	600	600
Mortgage loans held for sale	289,103	128,972
Fair Value \| Fair Value Measurements Using Level 2
Financial Assets:
Investment securities - AFS	61,299	64,957
Investment securities - HTM	9,982	10,250
Financial Liabilities:
Deposits	1,423,802	1,336,353
FHLB advances	40,000	25,000
Long-term debt	42,457	44,319
Fair Value \| Fair Value Measurements Using Level 3
Financial Assets:
Loans, net	1,326,775	1,236,289
Financial Liabilities:
Subordinated debenture liability	$ 3,861	$ 3,348

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income as reported	$ 9,437	$ 8,536	$ 18,283	$ 14,029
Shares outstanding	16,544,627	12,827,803	16,544,627	12,827,803
Impact of weighting shares	(137,188)		(298,564)
Used in basic EPS, Income	$ 9,437	$ 8,536	$ 18,283	$ 14,029
Used in basic EPS, Shares	16,407,439	12,827,803	16,246,063	12,827,803
Dilutive effect of outstanding
Stock options, Shares	915,361	1,035,470	1,002,062	970,672
Used in dilutive EPS, Income	$ 9,437	$ 8,536	$ 18,283	$ 14,029
Used in dilutive EPS, Shares	17,322,800	13,863,273	17,248,125	13,798,475
Basic earnings per common share	$ 0.58	$ 0.67	$ 1.13	$ 1.09
Diluted earnings per common share	$ 0.54	$ 0.62	$ 1.06	$ 1.02

Qualified Affordable Housing Project Investments - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items]
Investment for qualified affordable housing projects	$ 9,800,000		$ 5,700,000
Unfunded commitments related to the investments in qualified affordable housing projects	8,100,000		$ 4,200,000
Amortization expense	$ 322,000	$ 119,000
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	Jul. 18, 2018 $ / shares
Recent Developments [Line Items]
Cash dividend declared date	Jul. 18, 2018
Cash dividends declared per share	$ 0.09
Cash dividend payable date	Aug. 15, 2018
Cash dividend declared, record date	Jul. 31, 2018