CU Bancorp (CUNB) 10-K 15 Mar 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Mar. 06, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Trading Symbol	CUNB
Entity Registrant Name	CU Bancorp
Entity Central Index Key	1,543,643
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		17,807,122
Entity Public Float			$ 367

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 41,281	$ 50,960
Interest earning deposits in other financial institutions	167,789	171,103
Total cash and cash equivalents	209,070	222,063
Certificates of deposit in other financial institutions	51,245	56,860
Investment securities available-for-sale, at fair value	469,950	315,785
Investment securities held-to-maturity, at amortized cost	42,027	42,036
Total investment securities	511,977	357,821
Loans	2,050,226	1,833,163
Allowance for loan loss	(19,374)	(15,682)
Net loans	2,030,852	1,817,481
Premises and equipment, net	4,184	5,139
Deferred tax assets, net	17,181	17,033
Other real estate owned, net		325
Goodwill	64,603	64,603
Core deposit and leasehold right intangibles, net	6,300	7,671
Bank owned life insurance	51,216	49,912
Accrued interest receivable and other assets	48,132	35,734
Total Assets	2,994,760	2,634,642
LIABILITIES AND SHAREHOLDERS' EQUITY
Non-interest bearing demand deposits	1,400,097	1,288,085
Interest bearing transaction accounts	332,702	261,123
Money market and savings deposits	845,110	679,081
Certificates of deposit	29,480	58,502
Total deposits	2,607,389	2,286,791
Securities sold under agreements to repurchase	18,816	14,360
Subordinated debentures, net	9,856	9,697
Accrued interest payable and other liabilities	20,514	16,987
Total Liabilities	2,656,575	2,327,835
Commitments and Contingencies (Note 7 and Note 21)
SHAREHOLDERS' EQUITY
Serial Preferred Stock - authorized, 50,000,000 shares: Series A, non-cumulative perpetual preferred stock, $1,000 per share liquidation preference, 16,400 shares authorized, 16,400 issued and outstanding at December 31, 2016 and 2015	16,955	16,995
Common stock - authorized, 75,000,000 shares no par value, 17,759,006 and 17,175,389 shares issued and outstanding at December 31, 2016 and 2015, respectively	235,873	230,688
Additional paid-in capital	25,213	23,017
Retained earnings	63,163	36,923
Accumulated other comprehensive loss, net of tax	(3,019)	(816)
Total Shareholders' Equity	338,185	306,807
Total Liabilities and Shareholders' Equity	$ 2,994,760	$ 2,634,642

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, liquidation preference per share	$ 1,000
Preferred stock, authorized shares	50,000,000	50,000,000
Common stock, shares authorized	75,000,000	75,000,000
Common stock, no par value
Common stock, shares issued	17,759,006	17,175,389
Common stock, shares outstanding	17,759,006	17,175,389
Series A Preferred Stock
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Preferred stock, authorized shares	16,400	16,400
Preferred stock, shares issued	16,400	16,400
Preferred stock, shares outstanding	16,400	16,400

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income
Interest and fees on loans	$ 93,589	$ 84,537	$ 51,882
Interest on investment securities	5,793	4,518	2,369
Interest on interest bearing deposits in other financial institutions	1,870	1,087	926
Total Interest Income	101,252	90,142	55,177
Interest Expense
Interest on interest bearing transaction accounts	416	413	278
Interest on money market and savings deposits	2,051	1,652	963
Interest on certificates of deposit	139	190	216
Interest on securities sold under agreements to repurchase	53	30	34
Interest on subordinated debentures	487	438	431
Total Interest Expense	3,146	2,723	1,922
Net Interest Income	98,106	87,419	53,255
Provision for loan losses	3,264	5,080	2,239
Net Interest Income After Provision For Loan Losses	94,842	82,339	51,016
Non-Interest Income
Gain (loss) on sale of securities, net	258	112	(47)
Gain on sale of SBA loans, net	1,359	1,797	1,221
Deposit account service charge income	4,814	4,644	2,744
Other non-interest income	5,581	5,177	3,791
Total Non-Interest Income	12,012	11,730	7,709
Non-Interest Expense
Salaries and employee benefits (includes stock based compensation expense of $3,567, $2,966 and $1,699 for the years ended December 31, 2016, 2015 and 2014, respectively)	40,852	37,955	26,519
Occupancy	6,039	5,792	4,112
Data processing	2,594	2,495	1,968
Legal and professional	3,782	2,411	2,006
FDIC deposit assessment	1,425	1,466	844
Merger expenses		498	2,302
OREO loss and expenses	85	245	15
Office services expenses	1,488	1,526	1,026
Other operating expenses	7,179	7,577	4,593
Total Non-Interest Expense	63,444	59,965	43,385
Net Income Before Provision for Income Tax Expense	43,410	34,104	15,340
Provision for income tax expense	15,953	12,868	6,432
Net Income	27,457	21,236	8,908
Preferred stock dividends and discount accretion or premium amortization	1,217	1,174	124
Net Income available to Common Shareholders	$ 26,240	$ 20,062	$ 8,784
Earnings Per Share
Basic earnings per share	$ 1.52	$ 1.21	$ 0.77
Diluted earnings per share	$ 1.50	$ 1.18	$ 0.75

Consolidated Statements of Inc5

Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Stock based compensation expense	$ 3,567	$ 2,966	$ 1,699

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 27,457	$ 21,236	$ 8,908
Other Comprehensive Income (Loss), net of tax:
Net change in unrealized gain (loss) on available-for-sale investment securities, net of tax	(2,053)	(941)	368
Reclassification of (gain) loss on investment securities available-for-sale to net income, net of tax	(150)	(65)	27
Other Comprehensive Income (Loss)	(2,203)	(1,006)	395
Comprehensive Income	$ 25,254	$ 20,230	$ 9,303

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Restricted Stock Units (RSUs)	Serial Preferred Stock	Common Stock	Common StockRestricted Stock Units (RSUs)	Additional Paid-in Capital	Additional Paid-in CapitalRestricted Stock Units (RSUs)	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2013				11,081,364
Beginning Balance at Dec. 31, 2013	$ 137,924			$ 121,675		$ 8,377		$ 8,077	$ (205)
Net issuance of restricted stock				167,384
Exercise of stock options	2,029			$ 2,029
Exercise of stock options (in shares)				221,016
Issuance of preferred stock for 1st Enterprise merger, (in shares)			16,400
Issuance of preferred stock for 1st Enterprise merger, net of fair value discount	15,921		$ 15,921
Issuance of common stock for 1st Enterprise merger, net of $27 of issuance costs (in shares)				5,240,409
Issuance of common stock for 1st Enterprise merger, net of $27 of issuance costs	102,685			$ 102,685
Issuance of replacement stock options for 1st Enterprise merger	9,561					9,561
Stock based compensation expense	1,699					1,699
Excess tax benefit - stock based compensation	582					582
Restricted stock repurchase		$ (471)					$ (471)
Restricted stock repurchase (in shares)					(26,317)
Preferred stock dividends, discount accretion and net premium amortization	(41)		$ 83					(124)
Net Income	8,908							8,908
Other comprehensive income (loss)	395								395
Ending Balance (in shares) at Dec. 31, 2014			16,400	16,683,856
Ending Balance at Dec. 31, 2014	279,192		$ 16,004	$ 226,389		19,748		16,861	190
Net issuance of restricted stock				81,825
Exercise of stock options	4,299			$ 4,299
Exercise of stock options (in shares)				454,019
Stock based compensation expense	2,966					2,966
Excess tax benefit - stock based compensation	1,274					1,274
Restricted stock repurchase		(971)					(971)
Restricted stock repurchase (in shares)					(44,311)
Preferred stock dividends, discount accretion and net premium amortization	(183)		$ 991					(1,174)
Net Income	21,236							21,236
Other comprehensive income (loss)	(1,006)								(1,006)
Ending Balance (in shares) at Dec. 31, 2015			16,400	17,175,389
Ending Balance at Dec. 31, 2015	306,807		$ 16,995	$ 230,688		23,017		36,923	(816)
Net issuance of restricted stock				130,934
Exercise of stock options	$ 5,185			$ 5,185
Exercise of stock options (in shares)	505,274			505,274
Stock based compensation expense	$ 3,567					3,567
Excess tax benefit - stock based compensation	1,437
Restricted stock repurchase		$ (1,371)					$ (1,371)
Restricted stock repurchase (in shares)					(52,591)
Preferred stock dividends, discount accretion and net premium amortization	(1,257)		$ (40)					(1,217)
Net Income	27,457							27,457
Other comprehensive income (loss)	(2,203)								(2,203)
Ending Balance (in shares) at Dec. 31, 2016			16,400	17,759,006
Ending Balance at Dec. 31, 2016	$ 338,185		$ 16,955	$ 235,873		$ 25,213		$ 63,163	$ (3,019)

Consolidated Statements of Sha8

Consolidated Statements of Shareholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Statement of Stockholders' Equity [Abstract]
Issuance of common stock for 1st Enterprise merger, issuance costs	$ 27

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income:	$ 27,457	$ 21,236	$ 8,908
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,264	5,080	2,239
Provision for losses on unfunded loan commitments	277	137	142
Stock based compensation expense	3,567	2,966	1,699
Depreciation	1,407	1,424	1,019
Net accretion of discounts/premiums for loans acquired and deferred loan fees/costs	(8,886)	(9,365)	(5,360)
Net amortization from investment securities	4,550	3,305	1,677
Increase in bank owned life insurance	(1,304)	(1,180)	(661)
Amortization of core deposit intangibles	1,280	1,680	391
Amortization of time deposit premium	(2)	(15)	(42)
Net (accretion) amortization of leasehold right intangible asset and liabilities	(205)	(21)	142
Accretion of subordinated debenture discount	159	159	159
Loss on disposal of fixed assets	30	92	7
Valuation write-downs on OREO		133
Loss on sale of OREO	14
Loss (gain) on sale of securities, net	(258)	(112)	47
Gain on sale of SBA loans, net	(1,359)	(1,797)	(1,221)
Decrease in deferred tax assets	1,450	675	732
Decrease (increase) in accrued interest receivable and other assets	(12,398)	456	2,428
Increase (decrease) in accrued interest payable and other liabilities	4,884	(1,964)	2,041
Net excess in tax benefit on stock compensation		(1,274)	(582)
Decrease in fair value of derivative swap liability	(1,338)	(251)	(1,147)
Net cash (used in) provided by operating activities	22,589	21,364	12,618
Cash flows from investing activities:
Cash and cash equivalents acquired in acquisition, net of cash paid			8,650
Purchases of investment securities	(253,990)	(134,688)	(52,042)
Proceeds from sales of investment securities	6,919	5,737	25,156
Proceeds from repayment and maturities from investment securities	84,821	40,310	23,080
Loans originated, net of principal payments	(206,389)	(200,739)	(132,846)
Purchases of premises and equipment	(482)	(1,278)	(1,042)
Proceeds from sale of OREO	311	717
Net decrease (increase) in certificates of deposit in other financial institutions	5,615	19,573	(4,572)
Purchase of bank owned life insurance		(10,000)
Net cash used in investing activities	(363,195)	(280,368)	(133,616)
Cash flows from financing activities:
Net increase in non-interest bearing demand deposits	112,012	255,451	67,591
Net increase in interest bearing transaction accounts	71,579	54,579	8,033
Net increase (decrease) in money market and savings deposits	166,029	35,406	(55,236)
Net decrease in certificates of deposit	(29,020)	(6,323)	(8,433)
Net increase (decrease) in securities sold under agreements to repurchase	4,456	4,949	(1,730)
Net proceeds from stock options exercised	5,185	4,299	2,029
Issuance costs of common stock for 1stEnterprise merger			(27)
Restricted stock repurchase	(1,371)	(971)	(471)
Dividends paid on preferred stock	(1,257)	(183)	(41)
Net excess in tax benefit on stock compensation		1,274	582
Net cash provided by financing activities	327,613	348,481	12,297
Net increase (decrease) in cash and cash equivalents	(12,993)	89,477	(108,701)
Cash and cash equivalents, beginning of year	222,063	132,586	241,287
Cash and cash equivalents, end of year	209,070	222,063	132,586
Supplemental disclosures of cash flow information:
Cash paid during the year for interest	3,333	2,877	1,801
Net cash paid during the year for taxes	12,632	11,567	3,725
Supplemental disclosures of non-cash investing activities:
Net change in unrealized gains (losses) on investment securities, net of tax	$ (2,053)	(941)	368
Loans transferred to other real estate owned		$ 325	850
Supplemental disclosures related to acquisitions:
Assets acquired			833,497
Liabilities assumed			705,214
Issuance of 16,400 shares of preferred stock			15,921
Cash paid for fractional and dissenter shares and stock options			$ 89

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 – Summary of Significant Accounting Policies CU Bancorp (the “Company”) is a bank holding company whose operating subsidiary is California United Bank. As a bank holding company, CU Bancorp is subject to regulation of the Federal Reserve Board (“FRB”). The term “Company”, as used throughout this document, refers to the consolidated financial statements of CU Bancorp and California United Bank. California United Bank (the “Bank”) is a full-service commercial business bank offering a broad range of banking products and services including: deposit services, lending and cash management to small and medium-sized businesses, to non-profit organizations, to business principals and entrepreneurs, to the professional community, including attorneys, certified public accountants, financial advisors, healthcare providers and investors. The Bank opened for business in 2005. Its headquarters office is located in Los Angeles, California. As a state chartered non-member bank, the Bank is subject to regulation by the California Department of Business Oversight (“DBO”) and the Federal Deposit Insurance Corporation (“FDIC”). The deposits of the Bank are insured by the FDIC to the maximum amount allowed by law. Basis of Financial Statement Presentation The consolidated financial statements include the accounts of the Company and the Bank. Significant intercompany items have been eliminated in consolidation. The accounting and reporting policies of the Company conform to U.S. generally accepted accounting principles (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission. CU Bancorp is the common shareholder of Premier Commercial Statutory Trust I, Premier Commercial Statutory Trust II and Premier Commercial Statutory Trust III. These trusts were established for the sole purpose of issuing trust preferred securities and do not meet the criteria for consolidation. For more detail, see Note 13 – Borrowings and Subordinated Debentures. Use of Estimates in the Preparation of Consolidated Financial Statements The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In addition, these accounting principles require the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements. Estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan loss and various assets and liabilities measured at fair value on a recurring and nonrecurring basis. While management uses the most current available information to recognize losses on loans, future additions to the allowance for loan loss may be necessary based on, among other factors, changes in local economic conditions. Business Combinations The Company has a number of fair value adjustments recorded within the consolidated financial statements at December 31, 2016 that relate to the business combinations with California Oaks State Bank “COSB”, Premier Commercial Bancorp “PC Bancorp” and 1 st Enterprise Bank “1 st Enterprise” on December 31, 2010, July 31, 2012 and November 30, 2014, respectively. These fair value adjustments includes goodwill, fair value adjustments on loans, core deposit intangible assets, other intangible assets, fair value adjustments to acquired lease obligations, fair value adjustments to certificates of deposit and fair value adjustments on derivatives. The assets and liabilities acquired through acquisitions have been accounted for at fair value as of the date of the acquisition. The goodwill that was recorded on the transactions represented the excess of the purchase price over the fair value of net assets acquired. Business Segments The Company is organized and operates as a single reporting segment, principally engaged in commercial business banking. The Company conducts its lending and deposit operations through nine full service branch offices located in Los Angeles, Orange, Ventura and San Bernardino counties. Cash and Cash Equivalents Within the Consolidated Statements of Cash Flows, cash and cash equivalents include cash, due from banks and interest earning deposits in other financial institutions. Cash flows from loans, deposits, securities sold under agreements to repurchase and certificates of deposit in other financial institutions are reported on a net basis. Restricted Cash Banking regulations require that all banks maintain a percentage of their deposits as reserves in cash or on deposit with the Federal Reserve Bank. Reserve balances of $16 million and $14 million were required by the Federal Reserve Bank of San Francisco as of December 31, 2016 and 2015, respectively. As of December 31, 2016, the Bank was in compliance with all known U.S. Federal Reserve Bank (“Federal Reserve”) reporting and reserve requirements. The Company’s restricted cash is included in interest earning deposits in other financial institutions on the accompanying consolidated balance sheets. Interest Earning Deposits in Other Financial Institutions Interest earning deposits in other financial institutions represent short term interest earning deposits, which include money market deposit accounts with other financial institutions, and interest earning deposits with the Federal Reserve. These deposits can generally provide the Company with immediate liquidity and generally can be liquidated the same day as is the case with the Federal Reserve within seven days on money market deposit accounts with other financial institutions. Certificates of Deposit in Other Financial Institutions The Company’s investments in certificates of deposit issued by other financial institutions are generally fully insured by the FDIC up to the applicable limit of $250 thousand and have an original maturity of up to 12 months. The current remaining maturities of the Company’s certificates of deposit in other financial institutions at December 31, 2016 range from 4 days to 12 months with a weighted average maturity of 6.2 months and a weighted average yield of 0.97%. At December 31, 2016 and 2015, the Company had $2.7 million of certificates of deposits pledged as collateral for its interest rate swap agreements with one counterparty bank. Concentrations and Credit Risk in Other Financial Institutions The Company maintains certain deposits in other financial institutions in amounts that exceed federal deposit insurance coverage. At December 31, 2016, the amount of deposits in other financial institutions that the Company did not maintain with either the Federal Reserve Bank or the Federal Home Loan Bank and were not covered by FDIC insurance was $38 million in non-interest bearing accounts, $70 million in interest bearing accounts, and $2.7 million in certificates of deposit in other financial institutions. Based on management’s evaluation of the credit risk of maintaining balances and transactions with these correspondent financial institutions, management does not believe that the Company is exposed to any significant credit risk on these balances. Investment Securities The Company currently classifies its investment securities under the available-for-sale and held-to-maturity classifications. Under the available-for-sale classification, securities can be sold in response to certain conditions, such as changes in interest rates, changes in the credit quality of the securities, when the credit quality of a security does not conform with current investment policy guidelines, fluctuations in deposit levels or loan demand or a need to restructure the portfolio to better match the maturity or interest rate characteristics of liabilities with assets. Securities classified as available-for-sale are accounted for at their current fair value rather than amortized cost. Unrealized gains or losses are excluded from net income and reported as a separate component of accumulated other comprehensive income (loss) included in shareholders’ equity. If the Company has the intent and the ability at the time of purchase to hold certain securities until maturity, they are classified as held-to-maturity and are stated at amortized cost. As of each reporting date, the Company evaluates the securities portfolio to determine if there has been an other-than-temporary impairment (“OTTI”) on each of the individual securities in the investment securities portfolio. If it is probable that the Company will be unable to collect all amounts due according to the contractual terms of a debt security not impaired at acquisition, an OTTI shall be considered to have occurred. Once an OTTI is considered to have occurred, the credit portion of the loss is required to be recognized in current earnings, while the non-credit portion of the loss is recorded as a separate component of shareholders’ equity. In estimating whether an other-than-temporary impairment loss has occurred, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, (iii) the current liquidity and volatility of the market for each of the individual security categories, (iv) the current slope and shape of the Treasury yield curve, along with where the economy is in the current interest rate cycle, (v) the spread differential between the current spread and the long-term average spread for that security category, (vi) the projected cash flows from the specific security type, (vii) any financial guarantee and financial condition of the guarantor and (viii) the intent and ability of the Company to retain its investment in the issue for a period of time sufficient to allow for any anticipated recovery in fair value. If it’s determined that an OTTI exists on a debt security, the Company then determines if (a) it intends to sell the security or (b) it is more likely than not that it will be required to sell the security before its anticipated recovery. If either of the conditions is met, the Company will recognize the amount of the OTTI in earnings equal to the difference between the security’s fair value and its adjusted cost basis. If neither of the conditions is met, the Company determines (a) the amount of the impairment related to credit loss and (b) the amount of the impairment due to all other factors. The difference between the present value of the cash flows expected to be collected and the amortized cost basis is the credit loss. The credit loss is the portion of the other-than-temporary impairment that is recognized in earnings and is a reduction to the cost basis of the security. The portion of total impairment related to all other factors is included in other comprehensive income. Significant judgment is required in this analysis that includes, but is not limited to assumptions regarding the collectability of principal and interest, future default rates, future prepayment speeds, the amount of current delinquencies that will result in defaults and the amount of eventual recoveries expected on the underlying collateral. Realized gains and losses on sales of securities are recognized in earnings at the time of sale and are determined on a specific-identification basis. Purchase premiums and discounts are recognized in interest income using the interest method over the expected maturity term of the securities. For mortgage-backed securities, the amortization or accretion is based on estimated average lives of the securities. The lives of these securities can fluctuate based on the amount of prepayments received on the underlying collateral of the securities. The amount of prepayments varies from time to time based on the interest rate environment and the rate of turnover of mortgages. The Company’s investment in the common stock of Pacific Coast Bankers Bank (“PCBB”) and The Independent Banker’s Bank (“TIB”) is carried at cost, evaluated for impairment and is included in other assets on the accompanying consolidated balance sheets. Federal Home Loan Bank Stock As a member of the Federal Home Loan Bank of San Francisco (“FHLB”), the Bank is required to maintain an investment in capital stock of the FHLB. The stock does not have a readily determinable fair value and as such is carried at cost and evaluated for impairment. The stock’s value is determined by the ultimate recoverability of the par value rather than by recognizing temporary declines. The determination of whether the par value will ultimately be recovered is influenced by criteria such as the following: (a) the significance of the changes in (increases or declines) in the net assets of the FHLB as compared to the capital stock amount and the length of time these changes (situation) has persisted, (b) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance, (c) the impact of legislative and regulatory changes on the customer base of the FHLB and (d) the liquidity position of the FHLB. The Company’s investment in FHLB stock is included in other assets on the accompanying consolidated balance sheets. Loans and Interest and Fees on Loans The Company extends commercial, Small Business Administration, commercial real estate, construction and personal loans to business principals and entrepreneurs, to small and medium-sized businesses, to non-profit organizations, to the professional community, including attorneys, certified public accountants, financial advisors, healthcare providers, and to investors. Loans that the Company has the ability and intent to hold until maturity are stated at the their outstanding unpaid principal balances net of charge offs, net of deferred loan fees and costs on originated loans, net of unearned discounts and unamortized premiums on acquired loans, and further reduced by the valuation allowance for loan losses. Nonrefundable loan fees and direct costs associated with the origination of loans are deferred and recognized in interest income over the loan term using the level yield method. Further, discounts or premiums on acquired loans are accreted or amortized to interest income using the level yield method. Interest on loans is accrued daily and credited to income based on the principal amount outstanding. Interest is calculated using the terms of the loan according to the contractual note agreements. A small number of commercial real estate loans have been identified and designated as hedged items by the Company. For a detailed discussion of the accounting related to the loans designated as hedged items, see Note 1 – Summary of Significant Accounting Policies under “Derivative Financial Instruments and Hedging Activity” and Note 14 – Derivative Financial Instruments. Nonaccrual loans: When a loan is placed on nonaccrual status or has been charged-off, all interest income that has been accrued but not yet collected is reversed against interest income. Subsequent payments received from the customer are applied to principal and no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required. Impaired loans: Troubled debt restructurings Troubled debt restructurings are considered impaired loans and are evaluated for impairment, with the appropriate allowance for loan loss. In determining whether a debtor is experiencing financial difficulties, the Company considers if the debtor is in payment default or would be in payment default in the foreseeable future without the modification, the debtor declared or is in the process of declaring bankruptcy, there is substantial doubt that the debtor will continue as a going concern, the debtor’s entity-specific projected cash flows will not be sufficient to service its debt, or the debtor cannot obtain funds from sources other than the existing creditors at a market rate for debt with similar risk characteristics. In determining whether the Company would grant a concession, the Company assesses, if it does not expect to collect all amounts due, whether the current value of the collateral will satisfy the amounts owed, whether additional collateral or guarantees from the debtor will serve as adequate compensation for other terms of the restructuring, and whether the debtor otherwise has access to funds at a market rate for debt with similar risk characteristics. Typical concessions include reductions to the stated interest rate, payment extensions, principal forgiveness and other actions. A loan that is modified at a market rate of interest will not be classified as a troubled debt restructuring in the calendar year subsequent to the restructuring if it is in compliance with the modified terms and the expectation exists for continued performance going forward. Payment performance prior and subsequent to the restructuring is taken into account in assessing whether it is likely that the borrower can meet the new terms. This may result in the loan being returned to accrual at the time of restructuring, however the Company generally requires a period of sustained repayment for at least six months for return to accrual status. Purchased Credit Impaired Loans: Loans Held for Sale and Servicing Assets Loans held for sale are loans originated by the Company and include the principal amount outstanding net of unearned income and the loans are carried at the lower of cost or fair value on an aggregate basis. A decline in the aggregate fair value of the loans below their aggregate carrying amount is recognized through a charge to earnings in the period of such decline. Unearned income on these loans is taken into earnings when they are sold. At December 31, 2016 and 2015, the Company had no loans classified as held for sale. Gains or losses resulting from sales of loans are recognized at the date of settlement and are based on the difference between the cash received and the carrying value of the related loans less transaction costs. A transfer of financial assets in which control is surrendered is accounted for as a sale to the extent that consideration other than beneficial interests in the transferred assets is received in the exchange. Assets, liabilities, derivative financial instruments, or other retained interests issued or obtained through the sale of financial assets are measured at estimated fair value, if practicable. The most common retained interest related to loan sales is a servicing asset. Servicing assets are amortized in proportion to and over the period of the estimated future net servicing income. The amortization of the servicing asset and the servicing income are included in non-interest income. The fair value of the servicing assets is estimated by discounting the future cash flows using market-based discount rates and prepayment speeds. The Company’s servicing asset is evaluated regularly for impairment. The servicing asset is stratified based on the original term to maturity and the year of origination of the underlying loans for purposes of measuring impairment. If the fair value of the servicing asset is less than the amortized carrying value, the asset is considered to be impaired and an impairment charge will be taken against earnings. The servicing asset is included in other assets on the consolidated balance sheets. Allowance for Loan Loss The allowance for loan loss (“Allowance”) is established by a provision for loan losses that is charged against income, increased by charges to expense and decreased by charge-offs (net of recoveries). Loan charge-offs are charged against the Allowance when management believes the collectability of loan principal becomes unlikely. Subsequent recoveries, if any, are credited to the Allowance. The Allowance is an amount that management believes will be adequate to absorb estimated charge-offs related to specifically identified loans, as well as probable loan charge-offs inherent in the balance of the loan portfolio, based on an evaluation of the collectability of existing loans and prior loss experience. Management carefully monitors changing economic conditions, the concentrations of loan categories and collateral, the financial condition of the borrowers, the history of the loan portfolio, as well as historical peer group loan loss data to determine the adequacy of the Allowance. The Allowance is based upon estimates, and actual charge-offs may vary from the estimates. No assurance can be given that adverse future economic conditions will not lead to delinquent loans, increases in the provision for loan losses and/or charge-offs. These evaluations are inherently subjective, as they require estimates that are susceptible to significant revisions as conditions change. In addition, regulatory agencies, as an integral part of their examination process, may require additions to the Allowance based on their judgment about information available at the time of their examinations. Management believes that the Allowance as of December 31, 2016 is adequate to absorb known and probable losses inherent in the loan portfolio. The Allowance consists of specific and general components. The specific component relates to loans that are categorized as impaired. For loans that are categorized as impaired, a specific allowance is established when the realizable value of the impaired loan is lower than the recorded investment of that loan. The general component covers non-impaired loans and is based on the type of loan and historical charge-off experience adjusted for qualitative factors. While the general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative factors as discussed in Note 6 — Loans, the change in the Allowance from one reporting period to the next may not directly correlate to the rate of change of nonperforming loans for the following reasons: • A loan moving from the impaired performing status to an impaired non-performing status does not mandate an automatic increase in allowance. The individual loan is evaluated for a specific allowance requirement when the loan moves to the impaired status, not when the loan moves to non-performing status. In addition, the impaired loan is reevaluated at each subsequent reporting period. Impairment is measured based on the present value of the expected future cash flows discounted at the loan’s effective interest rate, except that as a practical expedient, the Company may measure impairment based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. • Not all impaired loans require a specific allowance. The payment performance of the borrower may require an impaired classification, but the collateral evaluation may support adequate collateral coverage. For a number of impaired loans in which borrower performance is in question, the collateral coverage may be sufficient. In those instances, neither a general allowance nor a specific allowance is assessed. Premises and Equipment Premises and equipment are carried at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives, which range from three to seven years for furniture and fixtures. Leasehold improvements are amortized using the straight-line method over the estimated useful lives of the improvements or the remaining lease term, whichever is shorter. Expenditures for improvements or major repairs are capitalized and those for ordinary repairs and maintenance are charged to operations as incurred. Other Real Estate Owned (“OREO”) Real estate properties that are acquired through, or in lieu of, loan foreclosure are initially recorded at fair value, less estimated costs to sell, at the date of foreclosure, establishing a new cost basis. After foreclosure, valuations are periodically performed by management and the real estate is carried at the lower of the cost basis or fair value less estimated costs to sell. Gains and losses on the sale of OREOs and operating expenses of such assets are included in non-interest expense, and operating revenue of such assets is included in non-interest income. Goodwill and Other Intangible Assets Goodwill resulting from business combinations is generally determined as the excess of the fair value of the consideration transferred over the fair value of the identifiable net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination determined to have an indefinite useful life are not amortized, but tested for impairment at least annually, or more frequently if events and circumstances exist that indicate that an impairment test should be performed. The Company has selected October 1 st as the date to perform its annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives. Goodwill is the only intangible asset with an indefinite life on the Company’s consolidated balance sheets. There was no impairment as of December 31, 2016 or 2015. Core deposit intangible assets arising from business combinations are amortized using an accelerated method over their estimated useful lives and are classified under core deposit and leasehold right intangibles on the Company’s consolidated balance sheets. Leasehold right intangibles is the present value of the excess of market rate lease payments over the contractual lease payments of an acquired lease. The leasehold intangible asset is amortized to expense over the life of the lease and is classified under core deposit and leasehold right intangibles on the accompanying consolidated balance sheets. Qualified Affordable Housing Project Investments The Company has made investments in qualified affordable housing projects that are defined within the industry and here as investments in Low Income Housing Tax Credits (“LIHTC”). The investment in LIHTC provides the Company with tax credits and tax benefits which are designed to encourage investments in the construction and rehabilitation of low-income housing. The Company’s investments are made to limited partnerships that manage or invest in qualified affordable housing projects primarily to receive both tax credits and benefits in addition to CRA credits. The Company must meet certain conditions that a reporting entity must meet to be eligible to use a method other than the equity or cost method to account for qualified affordable housing project investments. If the conditions are met, the Company is permitted to amortize the initial cost of the investment in proportion to the amount of the tax credits and tax benefits received and recognize the net investment performance in the income statement as a component of income tax expense (benefit). The four conditions that must be met to utilize the proportional amortization method are: (a) it is probable that the tax credits allocable to the investor will be available, (b) the investor does not have the ability to exercise significant influence over the operating and financial policies of the limited partnership, and substantially all of the projected benefits are from tax credits and tax benefits, (c) the investor’s projected yield based solely on the cash flows from the tax credits and tax benefits is positive and (d) the investor is a limited partnership investor in the limited liability entity for both legal and tax purposes, and the investor is limited to its capital investment. The Company believes that all the above conditions are met to qualify for proportional amortization. In addition, the Company is required to evaluate its investments in LIHTC for impairment, when there are events or changes in circumstances indicating it is more likely than not that the carrying amount of the Company’s investment would not be realized either through the receipt of tax credits and tax benefits or through a sale. Management does not believe there is any impairment of its LIHTC investments at December 31, 2016. See Note 11 – Investments in Qualified Affordable Housing Projects for details on the Company’s investments in LIHTC’s. Transfers of Financial Assets Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Derivative Financial Instruments and Hedging Activities All derivative instruments (interest rate swap contracts) are recognized on the consolidated balance sheet at their current fair value. Every derivative instrument (including certain derivative instruments embedded in other contracts) is required to be recorded in the balance sheet as either an asset or liability measured at its fair value. ASC Topic 815 requires that changes in the derivative’s fair value be recognized currently in earnings unless specific hedge accounting criteria are met. Accounting for qualifying hedges allows a derivative’s gains and losses to offset related results on the hedged item in the income statement, and requires that a company must formally document, designate and assess the effectiveness of transactions that receive hedge accounting. On the date a derivative contract is entered into by the Company, the Company will designate the derivative contract as either a fair value hedge (i.e. a hedge of the fair value of a recognized asset or liability), a cash flow hedge (i.e. a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability), or a stand-alone derivative (i.e. and instrument with no hedging designation). For a derivative designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in other comprehensive income and are recognized in the income statement when the hedged item affects earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings, as other non-interest income. At inception and on an ongoing basis, the derivatives that are used in hedging transactions are assessed for effectiveness as to how effective they are in offsetting changes in fair values or cash flows of hedged items. The Company will discontinue hedge accounting prospectively when it is determined that the derivative is no longer effective in offsetting change in the fair value of the hedged item, the derivative expires or is sold, is terminated, or management determines that designation of the derivative as a hedging instrument is no longer appropriate. When hedge accounting is discontinued, the Company will continue to carry the derivative on the balance sheet at its fair value (if applicable), but will no longer adjust the hedged asset or liability for changes in fair value. The adjustments of the carrying amount of the hedged asset or liability will be accounted for in the same manner as other components of the carrying amount of that asset or liability, and the adjustments are amortized to interest income over the remaining life of the hedged item upon the termination of hedge accounting. Income Taxes The Company provides for current federal and state income taxes payable and for deferred taxes that result from differences between financial accounting rules and tax laws governing the timing of recognition of various income and expense items. The Company recognizes deferred income tax assets and liabilities for the future tax effects of such temporary differences based on the difference between the financial statement and tax bases of the existing assets and liabilities using the statutory rate expected in the years in which the differences are expected to reverse. The effect on deferred taxes of any enacted change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is est

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Business Combinations	Note 2 – Business Combinations On November 30, 2014, the Company completed the merger with 1st Enterprise pursuant to the terms of the Agreement and Plan of Merger dated June 2, 2014, as amended (“Merger Agreement”). 1st Enterprise was merged with and into the Bank, with the Bank continuing as the surviving entity in the merger. Pursuant to the terms and conditions set forth in the Merger Agreement, each outstanding share of 1st Enterprise common stock (other than shares as to which the holder exercised dissenters’ rights) was converted into the right to receive 1.3450 of a share of CU Bancorp common stock, resulting in 5.2 million shares of CU Bancorp common stock issued. The fair value of the 5.2 million common stock issued as part of the consideration paid ($103 million) was determined based on the closing market price ($19.60) of CU Bancorp common stock on November 30, 2014. The 16,400 shares of 1st Enterprise Non-Cumulative Perpetual Preferred Stock, Series D were converted into the right to receive 16,400 shares of CU Bancorp’s Non-Cumulative Perpetual Preferred Stock, Series A (“CU Bancorp Preferred Stock”). The U.S. Department of the Treasury is the sole holder of all outstanding shares of CU Bancorp Preferred Stock. As part of the Merger Agreement, CU Bancorp adopted the 1st Enterprise 2006 Stock Incentive Plan, as amended, as its own equity plan and all stock options granted by 1st Enterprise thereunder are exercisable for CU Bancorp common stock on substantially the same terms but adjusted to reflect the exchange ratio set forth in the Merger Agreement. See Note 16 – Stock Options and Restricted Stock for more details. The merger was accounted for by the Company using the acquisition method of accounting. Accordingly, the assets and liabilities of 1st Enterprise were recorded at their respective fair values at acquisition date and represents management’s estimates based on available information as of the acquisition date. The following table presents (unaudited) pro forma information for the period indicated as though the 1 st Enterprise merger had been completed as of January 1, 2013. The 2014 pro forma net income excludes historical non-recurring merger expenses net of taxes, totaling approximately $3.2 million for the Company and 1 st Enterprise (dollars in thousands, except per share data). Proforma Year ended Net interest income after provision for loan losses $ 77,140 Net income $ 17,218 Preferred stock dividends and discount accretion (1,234 ) Net income available to common shareholders $ 15,984 Diluted earnings per share $ 0.94 The above proforma results are presented for illustrative purposes and are not intended to represent or be indicative of the actual results of operations of the merged companies that would have been achieved had the acquisition occurred at January 1, 2014 for 1 st Enterprise nor are they intended to represent or be indicative of future results of operations. The proforma results do not include operating cost savings as a result of the acquisition. These proforma results require significant estimates and judgments particularly as it relates to valuation and accretion of income associated with acquired loans.

Computation of Book Value and T

Computation of Book Value and Tangible Book Value per Common Share	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Computation of Book Value and Tangible Book Value per Common Share	Note 3 – Computation of Book Value and Tangible Book Value per Common Share Book value per common share was calculated by dividing total shareholders’ equity less preferred stock, by the number of common shares issued and outstanding. Tangible book value per common share was calculated by dividing tangible common equity, by the number of common shares issued and outstanding. The tables below present the computation of book value and tangible book value per common share as of the dates indicated (dollars in thousands, except share and per share data): December 31, 2016 2015 Total Shareholders’ Equity $ 338,185 $ 306,807 Less: Preferred stock 16,955 16,995 Less: Goodwill 64,603 64,603 Less: Core deposit and leasehold right intangibles 6,300 7,671 Tangible Shareholders’ Equity $ 250,327 $ 217,538 Common shares issued and outstanding 17,759,006 17,175,389 Book value per common share $ 18.09 $ 16.87 Tangible book value per common share $ 14.10 $ 12.67

Computation of Earnings per Com

Computation of Earnings per Common Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Computation of Earnings per Common Share	Note 4 – Computation of Earnings per Common Share On July 1, 2016, and effective January 1, 2016, the Company early adopted ASU 2016-09 which provides improvements to the accounting for employee share-based payments. In calculating potential common shares used to determine diluted earnings per share, U.S. GAAP requires the Company to use the treasury stock method. ASU 2016-09 requires that assumed proceeds under the treasury stock method be modified to exclude the amount of excess tax benefits that would have been recognized in additional paid-in capital. Basic and diluted earnings per common share were determined by dividing net income available to common shareholders by the applicable basic and diluted weighted average common shares outstanding. The following table shows weighted average basic common shares outstanding, potential dilutive shares related to stock options, unvested restricted stock, and weighted average diluted shares for the periods indicated (dollars in thousands, except share and per share data): Years Ended 2016 2015 2014 Net Income $ 27,457 $ 21,236 $ 8,908 Less: Preferred stock dividends and discount accretion 1,217 1,174 124 Net Income available to common shareholders $ 26,240 $ 20,062 $ 8,784 Weighted average basic common shares outstanding 17,252,046 16,543,787 11,393,445 Dilutive effect of potential common share issuances from stock options and restricted stock 298,819 439,434 274,288 Weighted average diluted common shares outstanding 17,550,865 16,983,221 11,667,733 Income per common share Basic $ 1.52 $ 1.21 $ 0.77 Diluted $ 1.50 $ 1.18 $ 0.75 Anti-dilutive shares not included in the calculation of diluted earnings per share 1,189 32,811 79,000

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Note 5 – Investment Securities The investment securities portfolio has been classified into two categories: available-for-sale (“AFS”) and held-to-maturity (“HTM”). The following tables present the amortized cost, gross unrealized gains and losses, and fair values of investment securities by major category as of the dates indicated (dollars in thousands): Gross Unrealized December 31, 2016 Amortized Cost Gains Losses Fair Value Available-for-sale investment securities: U.S. Govt Agency and Sponsored Agency – Note Securities $ 10,000 $ — $ 31 $ 9,969 U.S. Govt Agency – SBA Securities 123,224 365 739 122,850 U.S. Govt Agency – GNMA Mortgage-Backed Securities 22,565 70 265 22,370 U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities 243,159 92 4,351 238,900 Asset Backed Securities 7,111 — 215 6,896 U.S. Treasury Notes 69,101 7 143 68,965 Total available-for-sale 475,160 534 5,744 469,950 Held-to-maturity investment securities: Municipal Securities 42,027 69 159 41,937 Total held-to-maturity 42,027 69 159 41,937 Total investment securities $ 517,187 $ 603 $ 5,903 $ 511,887 Gross Unrealized December 31, 2015 Amortized Cost Gains Losses Fair Value Available-for-sale investment securities: U.S. Govt Agency and Sponsored Agency – Note Securities $ 1,014 $ — $ — $ 1,014 U.S. Govt Agency – SBA Securities 93,674 399 583 93,490 U.S. Govt Agency – GNMA Mortgage-Backed Securities 30,916 202 418 30,700 U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities 97,693 250 789 97,154 Corporate Securities 4,016 7 — 4,023 Municipal Securities 1,010 1 — 1,011 Asset Backed Securities 7,890 — 243 7,647 U.S. Treasury Notes 80,981 — 235 80,746 Total available-for-sale 317,194 859 2,268 315,785 Held-to-maturity investment securities: Municipal Securities 42,036 335 32 42,339 Total held-to-maturity 42,036 335 32 42,339 Total investment securities $ 359,230 $ 1,194 $ 2,300 $ 358,124 The Company’s investment securities portfolio at December 31, 2016, consists of U.S. Treasury Notes, U.S. Agency and U.S. Sponsored Agency issued AAA and AA rated investment-grade securities, asset backed securities, and municipal securities. At December 31, 2016 and December 31, 2015, securities with a market value of $205 million and $197 million, respectively, were pledged as collateral for securities sold under agreements to repurchase, public deposits, outstanding standby letters of credit, bankruptcy deposits, and other purposes as required by various statutes and agreements. See Note 9 – Borrowings and Subordinated Debentures. The following tables present the gross unrealized losses and fair values of AFS and HTM investment securities that were in unrealized loss positions, summarized and classified according to the duration of the loss period as of the dates indicated (dollars in thousands). < 12 Continuous Months > 12 Continuous Total December 31, 2016 Fair Value Gross Fair Gross Fair Value Gross Available-for-sale investment securities: U.S. Govt. Agency – SBA Securities $ 54,302 $ 451 $ 39,322 $ 288 $ 93,624 $ 739 U.S. Govt. Agency – GNMA Mortgage-Backed Securities 6,652 98 8,264 167 14,916 265 U.S. Govt. Agency 9,969 31 — 9,969 31 U.S. Govt. Sponsored Agency CMO & Mortgage-Backed Securities 215,138 4,172 10,879 179 226,017 4,351 Asset Backed Securities — — 6,896 215 6,896 215 U.S. Treasury Notes 51,972 143 — — 51,972 143 Total available-for-sale $ 338,033 $ 4,895 $ 65,361 $ 849 $ 403,394 $ 5,744 Held-to-maturity investment securities: Municipal Securities $ 28,673 $ 158 $ 310 $ 1 $ 28,983 $ 159 Total held-to-maturity $ 28,673 $ 158 $ 310 $ 1 $ 28,983 $ 159 < 12 Continuous Months > 12 Continuous Total December 31, 2015 Fair Value Gross Fair Gross Fair Value Gross Available-for-sale investment securities: U.S. Govt. Agency SBA Securities $ 53,852 $ 428 $ 7,935 $ 154 $ 61,787 $ 582 U.S. Govt. Agency – GNMA Mortgage-Backed Securities 5,417 47 14,296 371 19,713 418 U.S. Govt. Sponsored Agency – CMO & Mortgage-Backed Securities 67,475 564 10,024 225 77,499 789 Asset Backed Securities 2,928 54 4,719 190 7,647 244 U.S Treasury Notes 80,745 235 — — 80,745 235 Total available-for-sale $ 210,417 $ 1,328 $ 36,974 $ 940 $ 247,391 $ 2,268 Held-to-maturity investment securities: Municipal Securities $ 5,669 $ 16 $ 2,392 $ 16 $ 8,061 $ 32 Total held-to-maturity $ 5,669 $ 16 $ 2,392 $ 16 $ 8,061 $ 32 The unrealized losses in each of the above categories are associated with the general fluctuation of market interest rates and are not an indication of any deterioration in the credit quality of the security issuers. Further, the Company does not intend to sell these securities and is not more-likely-than-not to be required to sell the securities before the recovery of its amortized cost basis. Accordingly, the Company had no securities that were classified as other-than-temporary impaired at December 31, 2016 or 2015, and did not recognize any impairment charges in the consolidated statements of income. The amortized cost, fair value and the weighted average yield of debt securities at December 31, 2016, are reflected in the table below (dollars in thousands). Maturity categories are determined as follows: • U.S. Govt. Agency, U.S. Treasury Notes and U.S. Govt. Sponsored Agency bonds and notes – maturity date • U.S. Govt. Sponsored Agency CMO or Mortgage-Backed Securities, U.S. Govt. Agency GNMA Mortgage-Backed Securities, Asset Backed Securities and U.S. Gov. Agency SBA Securities – estimated cash flow taking into account estimated pre-payment speeds • Municipal Securities – the earlier of the maturity date or the expected call date. Although, U.S. Government Agency and U.S. Government Sponsored Agency Mortgage-Backed and CMO securities have contractual maturities through 2048, the expected maturity will differ from the contractual maturities because borrowers or issuers may have the right to prepay such obligations without penalties. December 31, 2016 Maturities Schedule of Securities (Dollars in thousands) Amortized Fair Value Weighted Available-for-sale investment securities: Due through one year $ 126,167 $ 125,375 1.13 % Due after one year through five years 194,066 191,915 1.52 % Due after five years through ten years 117,858 116,127 1.89 % Due after ten years 37,069 36,533 2.21 % Total available-for-sale 475,160 469,950 1.56 % Held-to-maturity investment securities: Due through one year 3,711 3,711 1.42 % Due after one year through five years 35,336 35,254 1.63 % Due after five years through ten years 2,980 2,972 2.71 % Total held-to-maturity 42,027 41,937 1.69 % Total investment securities $ 517,187 $ 511,887 1.57 % The weighted average yields in the above table are based on effective rates of book balances at the end of the year. Yields are derived by dividing interest income, adjusted for amortization of premiums and accretion of discounts, by total amortized cost. During the years ended December 31, 2016, 2015 and 2014 the Company recognized net gains and (losses) on sales of investment securities in the amount of $258 thousand, $112 thousand and $(47) thousand, respectively. The Company had net proceeds from the sale of $6.9 million, $5.7 million and $25 million during the years ended December 31, 2016, 2015 and 2014, respectively. Investment in Federal Home Loan Bank (FHLB) Common Stock The Company’s investment in the common stock of the FHLB is carried at cost and was $9.1 million and $8.0 million as of December 31, 2016 and 2015, respectively. The investment in FHLB stock is included in accrued interest receivable and other assets in the consolidated balance sheets and is periodically evaluated for impairment. Based on the capital adequacy of the FHLB and its overall financial condition, no impairment losses have been recorded. See Note 13 – Borrowings and Subordinated Debentures for a detailed discussion regarding the Company’s borrowings and the requirements to purchase FHLB common stock. The FHLB has declared and paid cash dividends in 2016, 2015 and 2014. The Company has received cash dividends from the FHLB of $1.1 million, $1.1 million, and $320 thousand for the years ending December 31, 2016, 2015, and 2014, respectively, and they are included in Other non-interest income of the accompanying consolidated statements of income. The FHLB has been classified as one of the Company’s primary correspondent banks and is evaluated on a quarterly basis as part of the Company’s evaluation of its correspondent banking relationships under Federal Reserve Board Regulation F. Interest Income on Investment Securities The following table presents the composition of interest income on investment securities for the periods indicated (dollars in thousands): Years ended December 31, 2016 2015 2014 Taxable interest $ 5,141 $ 3,773 $ 2,331 Non-taxable interest 652 745 38 Total interest income on investment securities $ 5,793 $ 4,518 $ 2,369

Loans

Loans	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Loans	Note 6 – Loans The following table presents the composition of the loan portfolio as of the dates indicated (dollars in thousands): December 31, 2016 Principal Net Unaccreted Net Deferred Fees Total Commercial and Industrial Loans: $ 505,374 $ (2,737 ) $ 502,637 Loans Secured by Real Estate: Owner-Occupied Nonresidential Properties 455,120 (3,798 ) 451,322 Other Nonresidential Properties 635,856 (5,693 ) 630,163 Construction, Land Development and Other Land 195,215 (1,156 ) 194,059 1-4 Family Residential Properties 129,261 (2,097 ) 127,164 Multifamily Residential Properties 110,336 (478 ) 109,858 Total Loans Secured by Real Estate 1,525,788 (13,222 ) 1,512,566 Other Loans: 35,246 (223 ) 35,023 Total Loans $ 2,066,408 $ (16,182 ) $ 2,050,226 December 31, 2015 Principal Net Unaccreted Net Deferred Fees Total Commercial and Industrial Loans: $ 543,192 $ (5,824 ) $ 537,368 Loans Secured by Real Estate: Owner-Occupied Nonresidential Properties 412,772 (4,793 ) 407,979 Other Nonresidential Properties 539,260 (6,092 ) 533,168 Construction, Land Development and Other Land 126,626 (794 ) 125,832 1-4 Family Residential Properties 117,400 (2,875 ) 114,525 Multifamily Residential Properties 72,222 (1,043 ) 71,179 Total Loans Secured by Real Estate 1,268,280 (15,597 ) 1,252,683 Other Loans: 43,218 (106 ) 43,112 Total Loans $ 1,854,690 $ (21,527 ) $ 1,833,163 Loans are made to commercial, non-profit organizations and consumers. Specific loan terms vary as to interest rate, repayment, and collateral requirements based on the type of loan requested and the credit worthiness of the prospective borrower. Credit risk tends to be geographically concentrated in Southern California where a majority of the Company’s loan customers are located. The Company’s extensions of credit are governed by its credit policies which are established to control the quality, structure and adherence to applicable laws. These policies are reviewed and approved by the Board of Directors on a regular basis. Commercial and Industrial Loans Commercial Real Estate Loans Construction and Land Development Loans Residential Loans Other Loans Acquired loans: Restructured loans Concentrations The Company makes commercial, construction, commercial real estate, and consumer home equity loans to customers primarily in Los Angeles, Riverside, Orange, San Bernardino and Ventura Counties. As an abundance of caution, the Company may require commercial real estate collateral on a loan classified as a commercial loan. At December 31, 2016, loans secured by real estate collateral accounted for approximately 74% of the loan portfolio. Of these loans, 96% are secured by first trust deed liens and 4% are secured by second trust deed liens. In addition, 30% are secured by owner-occupied non-residential properties. Loans secured by first trust deeds on commercial real estate generally have an initial loan to value ratio of not more than 75%, except for SBA guaranteed loans which may exceed this level. The Company’s policy for requiring collateral is to obtain collateral whenever it is available or desirable, depending upon the degree of risk in the proposed credit transaction. In addition, 20% of total loans have been secured by a UCC filing on the business property of the borrower. Approximately 5% of loans are unsecured. The Company’s loans are expected to be repaid from cash flows or from proceeds from the sale of selected assets of the borrowers. A substantial portion of the Company’s customers’ ability to honor their contracts is dependent on the economy in the area. The Company’s goal is to continue to maintain a diversified loan portfolio which are well collateralized and supported by sufficient cash flows. Small Business Administration Loans As part of the acquisition of PC Bancorp, the Company acquired loans that were originated under the guidelines of the Small Business Administration (“SBA”) program. The total portfolio of the SBA contractual loan balances being serviced by the Company at December 31, 2016 was $104 million, of which $75 million has been sold. Of the $29 million remaining on the Company’s books at December 31, 2016, $24 million is not guaranteed and $5 million is guaranteed by the SBA. In 2016, $14 million of SBA loans with contractual loan balances of $19 million were sold. Of the $4.8 million remaining on the Company’s books at December 31, 2016, $4.7 million is not guaranteed and $123 thousand is guaranteed. Allowance for Loan Loss The allowance for loan loss is established through a provision for loan losses charged to expense, which represents managements’ best estimate of probable losses that exist within the loan portfolio. The Allowance, in the judgment of management, is necessary to reserve for estimated loan losses and risks inherent in the loan portfolio. The Allowance consists of specific and general components. The specific component relates to loans that are categorized as impaired. For loans that are categorized as impaired, a specific allowance is established when the realizable value of the impaired loan is lower than the carrying value of that loan. Impairment is measured based on the present value of the expected future cash flows discounted at the loan’s effective interest rate, except that as a practical expedient, the Company may measure impairment based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. In addition, the impaired loan is reevaluated at each subsequent reporting period. The general component covers non-impaired loans and is based on the historical loan loss experience of the portfolio loan segments for the past 20 quarters, however the Company considers the Uniform Bank Peer Group (“UBPR”) historical loss data to evaluate potential loss exposure for those loan segments where the Company had no meaningful historical loss experience. The Allowance also includes an assessment of the following qualitative factors: the results of any internal and external loan reviews and any regulatory examination, loan charge-off experience, estimated potential charge-off exposure on each classified loan, credit concentrations, changes in the value of collateral for collateral dependent loans, and any known impairment in the borrower’s ability to repay. The Company also evaluates environmental and other factors such as underwriting standards, staff experience, the nature and volume of loans and loan terms, business conditions, political and regulatory conditions, local and national economic trends. The quantitative portion of the Allowance is adjusted for qualitative factors to account for model imprecision and to incorporate the range of probable outcomes inherent in the estimates used for the Allowance. The Company conducts a critical evaluation of the credit quality of the loan portfolio and the adequacy of the Allowance on a quarterly basis. The level of the Allowance reflects management’s continuing evaluation of industry concentrations, specific credit risks, loan loss experience, current loan portfolio quality, present economic, political and regulatory conditions and unidentified losses inherent in the current loan portfolio. Portions of the Allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off. While management utilizes its best judgment and information available, the ultimate adequacy of the Allowance is dependent upon a variety of factors beyond the Company’s control, including among other things, the performance of the Company’s loan portfolio, the economy, changes in interest rates and the view of the regulatory authorities toward loan classifications. The following is a summary of activity for the allowance for loan loss for the dates and periods indicated (dollars in thousands): December 31, 2016 2015 2014 Allowance for loan loss at beginning of year $ 15,682 $ 12,610 $ 10,603 Provision for loan losses 3,264 5,080 2,239 Net (charge-offs) recoveries: Charge-offs (895 ) (2,510 ) (692 ) Recoveries 1,323 502 460 Net (charge-offs) recoveries 428 (2,008 ) (232 ) Allowance for loan loss at end of year $ 19,374 $ 15,682 $ 12,610 Net (charge-offs) recoveries to average loans 0.02 % (0.12 )% (0.02 )% Allowance for loan loss to total loans 0.94 % 0.86 % 0.78 % Allowance for loan loss to total loans accounted for at historical cost, which excludes loans and the related allowance for loans acquired through acquisition 1.18 % 1.25 % 1.39 % The following tables present, by portfolio segment, the changes in the allowance for loan loss and the recorded investment in loans as of the dates and for the periods indicated (dollars in thousands): Commercial and Industrial Construction, Land Development and Other Land Commercial Other Real Other Total Year ended – December 31, 2016 Allowance for loan loss – Beginning balance $ 5,924 $ 2,076 $ 6,821 $ 861 $ 15,682 Provision for loan losses 783 1,008 1,661 (188 ) 3,264 Net (charge-offs) recoveries: Charge-offs (895 ) — — — (895 ) Recoveries 1,318 — 5 — 1,323 Total net recoveries 423 — 5 — 428 Ending balance $ 7,130 $ 3,084 $ 8,487 $ 673 $ 19,374 Commercial and Industrial Construction, Land Development and Other Land Commercial Other Real Other Total Year ended – December 31, 2015 Allowance for loan loss – Beginning balance $ 5,864 $ 1,684 $ 4,802 $ 260 $ 12,610 Provision for loan losses 1,781 392 2,306 601 5,080 Net (charge-offs) recoveries: Charge-offs (2,218 ) — (292 ) — (2,510 ) Recoveries 497 — 5 — 502 Total net (charge-offs) (1,721 ) — (287 ) — (2,008 ) Ending balance $ 5,924 $ 2,076 $ 6,821 $ 861 $ 15,682 The following tables present both the allowance for loan loss and the associated loan balance classified by loan portfolio segment and by credit evaluation methodology (dollars in thousands): Commercial and Industrial Construction, Land and Other Land Commercial Other Real Other Total December 31, 2016 Allowance for loan loss: Individually evaluated for impairment $ — $ — $ — $ — $ — Collectively evaluated for impairment 7,130 3,084 8,487 673 19,374 Purchased credit impaired (loans acquired with deteriorated credit quality) — — — — — Total Allowance for Loan Loss $ 7,130 $ 3,084 $ 8,487 $ 673 $ 19,374 Loans receivable: Individually evaluated for impairment $ 378 $ — $ 245 $ — $ 623 Collectively evaluated for impairment 501,960 194,059 1,316,849 35,023 2,047,891 Purchased credit impaired (loans acquired with deteriorated credit quality) 299 — 1,413 — 1,712 Total Loans Receivable $ 502,637 $ 194,059 $ 1,318,507 $ 35,023 $ 2,050,226 Commercial and Industrial Construction, Land and Other Land Commercial Other Real Other Total December 31, 2015 Allowance for loan loss: Individually evaluated for impairment $ — $ — $ — $ — $ — Collectively evaluated for impairment 5,924 2,076 6,821 861 15,682 Purchased credit impaired (loans acquired with deteriorated credit quality) — — — — — Total Allowance for Loan Loss $ 5,924 $ 2,076 $ 6,821 $ 861 $ 15,682 Loans receivable: Individually evaluated for impairment $ 558 $ — $ 649 $ — $ 1,207 Collectively evaluated for impairment 536,333 125,832 1,124,667 43,112 1,829,944 Purchased credit impaired (loans acquired with deteriorated credit quality) 477 — 1,535 — 2,012 Total Loans Receivable $ 537,368 $ 125,832 $ 1,126,851 $ 43,112 $ 1,833,163 Credit Quality of Loans The Company utilizes an internal loan classification system as a means of reporting problem and potential problem loans. Under the Company’s loan risk rating system, loans are classified as “Pass,” with problem and potential problem loans as “Special Mention,” “Substandard,” “Doubtful” and “Loss”. All loans are monitored and individual loan risk ratings are changed any time the situation warrants. In addition, management regularly reviews problem loans to determine whether any loan requires a classification change, in accordance with the Company’s policy and applicable regulations. The grading analysis estimates the capability of the borrower to repay the contractual obligations of the loan agreements as scheduled or at all. The internal loan classification risk grading system is based on experiences with similarly graded loans. The Company’s internally assigned grades are as follows: • Pass – loans which are protected by the current net worth and paying capacity of the obligor or by the value of the underlying collateral. There are several different levels of Pass rated credits, including “Watch” which is considered a transitory grade for pass rated loans that require greater monitoring. Loans not meeting the criteria of special mention, substandard, doubtful or loss that have been analyzed individually as part of the above described process are considered to be pass-rated loans. • Special Mention – loans where a potential weakness or risk exists, which could cause a more serious problem if not corrected. Special Mention loans do not currently expose the Company to sufficient risk to warrant classification as a Substandard, Doubtful or Loss classification, but possess weaknesses that deserve management’s close attention. • Substandard – loans that have a well-defined weakness based on objective evidence and can be characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. • Doubtful – loans classified as doubtful have all the weaknesses inherent in those classified as substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. • Loss – loans classified as a loss are considered uncollectible, or of such value that continuance as an asset is not warranted. The following tables present the risk category of loans by class of loans based on the most recent internal loan classification as of the dates indicated (dollars in thousands): December 31, 2016 Commercial Construction, Commercial Other Real Other Total Pass $ 456,885 $ 194,059 $ 1,288,154 $ 32,128 $ 1,971,226 Special Mention 12,774 — 7,557 — 20,331 Substandard 32,978 — 22,796 2,895 58,669 Doubtful — — — — — Total $ 502,637 $ 194,059 $ 1,318,507 $ 35,023 $ 2,050,226 December 31, 2015 Commercial Construction, Commercial Other Real Other Total Pass $ 503,006 $ 125,832 $ 1,101,548 $ 40,132 $ 1,770,518 Special Mention 16,041 — 6,494 43 22,578 Substandard 18,321 — 18,809 2,937 40,067 Doubtful — — — — — Total $ 537,368 $ 125,832 $ 1,126,851 $ 43,112 $ 1,833,163 Age Analysis of Past Due and Non-Accrual Loans The following tables present an aging analysis of the recorded investment in past due and non-accrual loans as of the dates indicated (dollars in thousands): December 31, 2016 31-60 Days Past Due 61-90 Days Past Due Greater 90 Days Past Due and Total Past Due and Total Non- Current Total Loans Commercial and Industrial $ — $ — $ — $ — $ 675 $ 501,962 $ 502,637 Construction, Land Development and Other Land — — — — — 194,059 194,059 Commercial and Other Real Estate 212 — — 212 447 1,317,848 1,318,507 Other — — — — — 35,023 35,023 Total $ 212 $ — $ — $ 212 $ 1,122 $ 2,048,892 $ 2,050,226 December 31, 2015 31-60 Days Past Due 61-90 Days Past Due Greater 90 Days Past Due and Total Past Due and Total Non- Current Total Loans Commercial and Industrial $ — $ — $ — $ — $ 1,032 $ 536,336 $ 537,368 Construction, Land Development and Other Land — — — — — 125,832 125,832 Commercial and Other Real Estate — — — — 1,019 1,125,832 1,126,851 Other — — — — — 43,112 43,112 Total $ — $ — $ — $ — $ 2,051 $ 1,831,112 $ 1,833,163 Included in the non-accrual column above are purchased credit impaired loans of $499 thousand and $844 thousand as of December 31, 2016 and 2015, respectively. Included in the current column are purchased credit impaired loans that have been returned to accrual status of $1.2 million and $1.2 million as of December 31, 2016 and 2015, respectively. Impaired Loans Impaired loans are evaluated by comparing the present value of the expected future cash flows discounted at the loan’s effective interest rate, or if the loan is collateral dependent, the fair value of the collateral less costs to sell, with the recorded investment of a loan. A valuation allowance is established for an impaired loan when the fair value of the loan is less than the recorded investment. In certain cases, portions of impaired loans are charged-off to the fair value instead of establishing a valuation allowance and are included, when applicable, in the table below as impaired loans “with no specific allowance recorded.” The valuation allowance disclosed below is included in the allowance for loan loss reported in the consolidated balance sheets as of December 31, 2016 and December 31, 2015. The following tables present, by loan portfolio segment, the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount, if applicable for the dates and periods indicated (dollars in thousands). These tables exclude purchased credit impaired loans (loans acquired in acquisitions with deteriorated credit quality) of $1.7 million and $2.0 million at December 31, 2016 and 2015, respectively. Year ended December 31, 2016 Recorded Unpaid Related Average Interest With no specific allowance recorded: Commercial and Industrial $ 378 $ 1,383 $ — $ 401 $ — Commercial and Other Real Estate 245 282 — 252 — With an allowance recorded: Commercial and Industrial — — — — — Commercial and Other Real Estate — — — — — Total Commercial and Industrial 378 1,383 — 401 — Commercial and Other Real Estate 245 282 — 252 — Total $ 623 $ 1,665 $ — $ 653 $ — Year ended December 31, 2015 Recorded Unpaid Related Average Interest With no specific allowance recorded: Commercial and Industrial $ 558 $ 1,027 $ — $ 672 $ — Commercial and Other Real Estate 649 692 — 70 — With an allowance recorded: Commercial and Industrial — — — — — Commercial and Other Real Estate — — — — — Total Commercial and Industrial 558 1,027 — 672 — Commercial and Other Real Estate 649 692 — 70 — Total $ 1,207 $ 1,719 $ — $ 742 $ — The following is a summary of additional information pertaining to impaired loans for the periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 2014 Average recorded investment in impaired loans $ 653 $ 742 $ 4,991 Interest foregone on impaired loans $ 89 $ 265 421 Cash collections applied to reduce principal balance $ 351 $ 1,118 3,014 Interest income recognized on cash collections $ — $ — $ — Troubled Debt Restructuring The Company’s loan portfolio contains certain loans that have been modified in a Troubled Debt Restructuring (“TDR”), where economic concessions have been granted to borrowers experiencing financial difficulties. Loans are restructured in an effort to maximize collections. Economic concessions can include: reductions to the stated interest rate, payment extensions, principal forgiveness or other actions. The modification process includes evaluation of impairment based on the present value of expected future cash flows, discounted at the effective interest rate of the original loan agreement, except when the sole (remaining) source of repayment for the loan is the operation or liquidation of the loan collateral. In these cases, management uses the current fair value of the collateral, less selling costs, to evaluate the loan for impairment. If management determines that the value of the modified loan is less than the recorded investment in the loan (net of previous charge-offs and unamortized premium or discount) impairment is recognized through a specific allowance or a charge-off. The following tables include the recorded investment and unpaid principal balances for troubled debt restructured loans at December 31, 2016, December 31, 2015 and December 31, 2014 (dollars in thousands). These tables include TDR loans that were purchased credit impaired (“PCI”). TDR loans that are non-PCI loans are included in Impaired Loans disclosures. As of December 31, 2016, there were two PCI loans that are considered to be TDR loans with a recorded investment of $105 thousand and unpaid principal balances of $273 thousand. Year ended December 31, 2016 Recorded Unpaid Interest Commercial and Industrial $ 408 $ 1,174 $ — Total $ 408 $ 1,174 $ — Year ended December 31, 2015 Recorded Unpaid Interest Commercial and Industrial $ 627 $ 1,363 $ — Total $ 627 $ 1,363 $ — Year ended December 31, 2014 Recorded Unpaid Interest Commercial and Industrial $ 530 $ 719 $ — Commercial and Other Real Estate 114 115 — Total $ 644 $ 834 $ — The following tables show the pre- and post-modification recorded investment in TDR loans by loan segment that have occurred during the periods indicated (dollars in thousands): Year ended December 31, 2016 Number Pre-Modification Post- Extended Maturity Date and Deferred Principal and Interest Payments: Commercial and Industrial 1 $ 650 $ 73 Total 1 $ 650 $ 73 Year ended December 31, 2015 Number Pre-Modification Post- Reduced Interest Rate and Lengthened Amortization: Commercial and Industrial 3 $ 1,335 $ 208 Total 3 $ 1,335 $ 208 Year ended December 31, 2014 Number Pre-Modification Post- Reduced Interest Rate and Lengthened Amortization: Commercial and Industrial 1 $ 224 $ 224 Commercial and Other Real Estate 1 114 114 Total 2 $ 338 $ 338 Loans are restructured in an effort to maximize collections. Impairment analyses are performed on the Company’s troubled debt restructured loans in conjunction with the normal allowance for loan loss process. The Company’s troubled debt restructured loans are analyzed to ensure adequate cash flow or collateral supports the outstanding loan balance. There were no commitments to lend additional funds to borrowers whose terms have been modified in troubled debt restructurings at December 31, 2016 or 2015. There have been no payment defaults in the year ended December 31, 2016 subsequent to modification on troubled debt restructured loans that have been modified within the last twelve months. Loans Acquired Through Acquisition The following table reflects the accretable net discount for loans acquired through acquisition, for the periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 Balance, beginning of year $ 14,610 $ 21,402 Accretion, included in interest income (4,967 ) (6,274 ) Additions, due to acquisition — — Reclassifications to non-accretable yield (32 ) (518 ) Balance, end of year $ 9,611 $ 14,610 The above table reflects the fair value adjustment on the loans acquired from mergers that will be amortized to loan interest income based on the effective yield method over the remaining life of the loans. These amounts do not include the fair value adjustments on the purchased credit impaired loans acquired from mergers. Purchased Credit Impaired Loans PCI loans are acquired loans with evidence of deterioration of credit quality since origination and it is probable at the acquisition date, that the Company will not be able to collect all contractually required amounts. When the timing and/or amounts of expected cash flows on such loans are not reasonably estimable, no interest is accreted and the loan is reported as a non-accrual loan; otherwise, if the timing and amounts of expected cash flows for PCI loans are reasonably estimable, then interest is accreted and the loans are reported as accruing loans. The non-accretable difference represents the difference between the undiscounted contractual cash flows and the undiscounted expected cash flows, and also reflects the estimated credit losses in the acquired loan portfolio at the acquisition date and can fluctuate due to changes in expected cash flows during the life of the PCI loans. The following table reflects the outstanding balance and related carrying value of PCI loans as of the dates indicated (dollars in thousands): December 31, 2016 December 31, 2015 Unpaid Carrying Unpaid Carrying Commercial and Industrial $ 622 $ 299 $ 2,331 $ 477 Commercial and Other Real Estate 1,997 1,413 2,250 1,535 Other — — 61 — Total $ 2,619 $ 1,712 $ 4,642 $ 2,012 There is no related allowance for credit losses with the PCI loans as of December 31, 2016 and 2015 included in the tables above. The following table reflects the activities in the accretable net discount for PCI loans for the period indicated (dollars in thousands): Year Ended Year Ended Balance, beginning of year $ 246 $ 324 Accretion, included in interest income (85 ) (78 ) Reclassifications from non-accretable yield — — Balance, end of year $ 161 $ 246

Premises and Equipment and Leas

Premises and Equipment and Lease Commitments	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment and Lease Commitments	Note 7 – Premises and Equipment and Lease Commitments Premises and equipment are stated at cost less accumulated depreciation and amortization. The following major classifications of premises and equipment are summarized as follows as of the dates indicated (dollars in thousands): December 31, 2016 2015 Furniture and equipment $ 8,032 $ 8,345 Leasehold improvements 7,382 7,260 Total 15,414 15,605 Less: Accumulated depreciation and amortization (11,230 ) (10,466 ) Total $ 4,184 $ 5,139 The following is a schedule of future minimum lease payments for operating leases for office and branch space based upon obligations at December 31, 2016 (dollars in thousands): Year Amount 2017 $ 3,322 2018 2,493 2019 2,345 2020 2,208 2021 1,903 Thereafter 2,215 Total $ 14,486 Total rental expense on facilities for the years ended December 31, 2016, 2015 and 2014 was $3.3 million, $3.1 million, and $2.2 million, respectively.

Goodwill, Core Deposit and Leas

Goodwill, Core Deposit and Leasehold Right Intangibles	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Core Deposit and Leasehold Right Intangibles	Note 8 – Goodwill, Core Deposit and Leasehold Right Intangibles Goodwill The following table presents changes in the carrying value of goodwill for the periods indicated (dollars in thousands): Year Ended 2016 2015 Balance, beginning of year $ 64,603 $ 63,950 Measurement-period adjustment — 653 Goodwill acquired during the year — — Impairment losses — — Balance, end of year $ 64,603 $ 64,603 Accumulated impairment losses at end of year $ — $ — For the year ended December 31, 2015, the Company early adopted ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustment, st Enterprise merger. The 1 st Enterprise merger closed on November 30, 2014. There would not be a significant impact on the consolidated statements of income for the years ended December 31, 2014 and 2015, had such measurement-period adjustment been recognized at the acquisition date, as such loan relationship had been on non-accrual status since early 2015. The Company’s goodwill was evaluated for impairment during the fourth quarter of 2016, with no impairment loss recognition considered necessary. Core Deposit Intangibles (“CDI”) The weighted average amortization period remaining for our core deposit intangibles is 5.2 years. The estimated aggregate amortization expense related to these intangible assets for each of the next five years is $1.1 million, $936 thousand, and $692 thousand, $628 thousand and $571 thousand. The Company’s core deposit intangibles were evaluated for impairment at December 31, 2016, taking into consideration the actual deposit runoff of acquired deposits to the level of deposit runoff expected at the date of merger. Based on the Company’s evaluation, no impairment has taken place on the core deposit intangibles. The following table presents the changes in the gross amounts of core deposit intangibles and the related accumulated amortization for the dates and periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 2014 Gross amount of CDI: Balance, beginning of year $ 9,246 $ 9,246 $ 2,103 Additions due to acquisitions — — 7,143 Balance, end of year 9,246 9,246 9,246 Accumulated Amortization: Balance, beginning of year (2,736 ) (1,056 ) (665 ) Amortization (1,280 ) (1,680 ) (391 ) Balance, end of year (4,016 ) (2,736 ) (1,056 ) Net CDI, end of year $ 5,230 $ 6,510 $ 8,190 Leasehold Right Intangibles Leasehold right intangible is the present value of the excess of market rate lease payments over the contractual lease payments of an acquired lease. The recorded value of the Company’s leasehold right intangibles at December 31, 2016 and 2015 was $1.1 million and $1.2 million, respectively. The amortization of the leasehold right intangibles is recorded within the consolidated income statement under occupancy expense. The net amortization of the leasehold right intangible assets and liabilities resulted in income of $205 thousand, income of $62 thousand, and expense of $142 thousand for the years ended December 31, 2016, 2015 and 2014, respectively. During 2015, the Company recorded a $41 thousand adjustment to the fair value of a lease that was acquired in the 1 st Enterprise merger due to a change in the sublease rate assumption since the acquisition date. The adjustment was an expense to merger cost.

Bank Owned Life Insurance

Bank Owned Life Insurance	12 Months Ended
	Dec. 31, 2016
Investments, All Other Investments [Abstract]
Bank Owned Life Insurance	Note 9 – Bank Owned Life Insurance At December 31, 2016 and 2015 the Company had $51 million and $50 million, respectively of Bank-Owned Life Insurance (“BOLI”). The Company recorded non-interest income associated with the BOLI policies of $1.3 million, $1.3 million, and $660 thousand for the years ending December 31, 2016, 2015 and 2014, respectively. The increase in the Company’s balance to $51 million in 2016 was due to an increase of $1.3 million in the cash surrender value of the policies during 2016. BOLI involves the purchasing of life insurance by the Company on a selected group of employees where the Company is the owner and beneficiary of the policies. BOLI is recorded as an asset at its cash surrender value. Increases in the cash surrender value of these policies, as well as a portion of the insurance proceeds received, are recorded in noninterest income and are not subject to income tax, as long as they are held for the life of the covered parties. At December 31, 2016, the $51 million was allocated between eight individual insurance companies, with balances ranging from approximately 1% to 37% of the Company’s outstanding BOLI balances. On an annual basis, the Company reviews the financial stability and ratings of all the individual insurance companies to ensure they are adequately capitalized, and that there is minimal risk to the BOLI assets.

Investment in California Organi

Investment in California Organized Investment Network ("COIN")	12 Months Ended
	Dec. 31, 2016
Investments Schedule [Abstract]
Investment in California Organized Investment Network ("COIN")	Note 10 – Investment in California Organized Investment Network (“COIN”) The Company has historically made investments with Community Development Financial Institutions (“CDFI”) as defined and recognized by the United States Department of Treasury and by the California Organized Investment Network (“COIN”) within the California Department of Insurance. These investments were certified by the California Department of Insurance and qualified for State of California income tax credits. The Company has previously utilized all the investments tax credits generated in the previous years. With regards to the Company’s previous investments with CDFI, if the Company were to redeem this deposit prior to its contractual and stated maturity date, the Company would lose the benefit of the tax credit taken in prior years. The investment, to qualify for this specific tax credit, must be for a minimum term of sixty months. In addition, the tax credit is required to be applied during the year in which the investments were made. These deposits are not insured by the FDIC, and are included in other assets on the consolidated balance sheet of the Company. The Company’s intentions are to hold these investments to their contractual maturity dates. These investments were also made to meet CRA investment goals. The Company’s investments in COIN were $1.4 million and $1.1 million at December 31, 2016 and 2015, respectively.

Qualified Affordable Housing Pr

Qualified Affordable Housing Project Investments	12 Months Ended
	Dec. 31, 2016
Federal Home Loan Banks [Abstract]
Qualified Affordable Housing Project Investments	Note 11 – Qualified Affordable Housing Project Investments The following table presents the Company’s original investment in the LIHTC projects, the current recorded investment balance, and the unfunded liability balance of each investment at December 31, 2016, 2015 and 2014. In addition, the table reflects the tax credits and tax benefits recorded by the Company during 2016, 2015 and 2014, the amortization of the investment and the net impact to the Company’s income tax provision for 2016, 2015 and 2014. The Company’s recorded investment balance in the LIHTC projects and the related unfunded liability balance are included in other assets and other liabilities on the accompanying consolidated balance sheets, respectively. Also see Note 19 – Income Tax, for the impact of these investments on the Company’s effective tax rate (dollars in thousands): Qualified Affordable Housing Projects at Original Current Unfunded Tax Credits Amortization of Investments (2) Net Income Enterprise Green Communities West II LP $ 1,000 $ 513 $ 22 $ 131 $ 90 $ 41 Enterprise Housing Partners Calgreen II Fund LP 2,050 1,214 165 218 212 6 Enterprise Housing Partners XXIV LP 2,000 1,513 391 212 167 45 Total – Investments in Qualified Affordable Housing Projects $ 5,050 $ 3,240 $ 578 $ 561 $ 469 $ 92 Qualified Affordable Housing Projects at Original Current Unfunded Tax Credits Amortization of Investments (2) Net Income Enterprise Green Communities West II LP $ 1,000 $ 604 $ 69 $ 136 $ 92 $ 44 Enterprise Housing Partners Calgreen II Fund LP 2,050 1,426 165 198 164 34 Enterprise Housing Partners XXIV LP 2,000 1,680 806 209 180 29 Total – Investments in Qualified Affordable Housing Projects $ 5,050 $ 3,710 $ 1,040 $ 543 $ 436 $ 107 Qualified Affordable Housing Projects at Original Current Unfunded Tax Credits Amortization of Net Income Enterprise Green Communities West II LP $ 1,000 $ 704 $ 162 $ 127 $ 84 $ 43 Enterprise Housing Partners Calgreen II Fund LP 2,050 1,588 635 229 174 55 Enterprise Housing Partners XXIV LP 2,000 1,849 1,685 160 112 48 Total – Investments in Qualified Affordable Housing Projects $ 5,050 $ 4,141 $ 2,482 $ 516 $ 370 $ 146 (1) The amounts reflected in this column represent both the tax credits, as well as the tax benefits generated by the Qualified Affordable Housing Projects operating loss for the year. (2) This amount reduces the tax credits and benefits generated by the Qualified Affordable Housing Projects The following table reflects the anticipated net income tax benefit that is expected to be recognized by the Company over the next five years (dollars in thousands): Qualified Affordable Housing Projects Enterprise Green Enterprise Enterprise Total Net Income Tax Anticipated net income tax benefit less amortization of investments: 2017 $ 43 $ 40 $ 38 $ 121 2018 43 40 37 120 2019 $ 43 $ 40 $ 37 $ 120 2020 40 40 37 117 2021 and thereafter 72 134 169 375 Total – anticipated net income tax benefit in Qualified Affordable Housing Projects $ 241 $ 294 $ 318 $ 853

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Deposits	Note 12 – Deposits The Company had CDARS ® ® ® ® ® ® At December 31, 2016, $28 million out of total time deposits of $29 million mature within one year. At December 31, 2016 and 2015, the Company had certificates of deposit with balances $250 thousand or more of $19 million and $18 million, respectively. The following table shows the maturity of the Company’s time deposits of $250 thousand or more at December 31, 2016 (dollars in thousands): Maturity of Time Deposits of $250,000 or More Three months or less $ 12,359 Over three through six months 2,034 Over six through twelve months 4,757 Over twelve months 269 Total $ 19,419 ICS ® During 2013 the Company began participating as a member of the Insured Cash Sweep ® ® ® ® ® ® ® ® CDARS ® The Company participates and is a member of the Certificate of Deposit Account Registry Service (CDARS ® ® ® ® ® ® ® ®

Borrowings and Subordinated Deb

Borrowings and Subordinated Debentures	12 Months Ended
	Dec. 31, 2016
Brokers and Dealers [Abstract]
Borrowings and Subordinated Debentures	Note 13 – Borrowings and Subordinated Debentures Securities Sold Under Agreements to Repurchase The Company enters into certain transactions, the legal form of which are sales of securities under agreements to repurchase (“Repos”) at a later date at a set price. Securities sold under agreements to repurchase generally mature within 1 day to 180 days from the issue date and are routinely renewed. As discussed in Note 5 – Investment Securities, the Company has pledged certain investments as collateral for these agreements. Securities with a fair value of $48 million and $47 million were pledged to secure the Repos at December 31, 2016 and December 31, 2015, respectively. The tables below describe the terms and maturity of the Company’s securities sold under agreements to repurchase as of the dates indicated (dollars in thousands): December 31, 2016 Date Issued Amount Interest Rate Original Maturity Date December 31, 2016 $ 18,816 0.2% – 0.25% 4 days January 4, 2017 Total $ 18,816 0.25% December 31, 2015 Date Issued Amount Interest Rate Original Maturity Date December 31, 2015 $ 14,360 0.08% – 0.25% 4 days January 4, 2016 Total $ 14,360 0.19% The table below describes additional details regarding the Company’s securities sold under agreements to repurchase for the dates and periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 Balance Average Weighted Balance Average Weighted Securities sold under agreements to repurchase $ 18,816 $ 22,739 0.23 % $ 14,360 $ 13,966 0.22 % The maximum amount securities sold under agreements to repurchase outstanding at any month-end was $26 million and $17 million in 2016 and 2015, respectively. Federal Home Loan Bank Borrowings The Company maintains a secured credit facility with the FHLB, allowing the Company to borrow on an overnight and term basis. The Company’s credit facility with the FHLB is $723 million, which represents approximately 25% of the Bank’s total assets, as reported by the Bank in its September 30, 2016 Federal Financial Institution Examination Council (FFIEC) Call Report. The Company had no outstanding advances (borrowings) with the FHLB as of December 31, 2016 or 2015, except for the annual testing of the borrowing lines. As of December 31, 2016, the Company had $990 million of loan collateral pledged with the FHLB which provides $658 million in borrowing capacity. The Company has $16 million in investment securities pledged with the FHLB to further support this credit facility. In addition, the Company is required to purchase FHLB common stock to support its FHLB advances. At December 31, 2016 and 2015, the Company had $9.1 million and $8.0 million of FHLB common stock, respectively. The current value of the FHLB common stock of $9.1 million would support FHLB advances up to $340 million. To reach a total borrowing capacity of $674 million collateralized by the current level of pledged loans and securities would require additional purchases of FHLB stock. Further, pledging additional loans and/or securities will increase borrowing capacity up to 25% of the Bank’s total assets, however, additional FHLB stock would have to be purchased. Interest on FHLB advances is generally paid monthly, quarterly or semi-annually depending on the terms of the advance, with principal and any accrued interest due at maturity. The FHLB has historically repurchased a portion to all of its excess capital from each bank where the level of capital is in excess of that bank’s current average borrowings above a certain minimum. The FHLB’s program whereby the FHLB analyzes each member bank’s capital requirement and returns each bank’s excess capital above a certain minimum not needed for current borrowings. The FHLB did not repurchase any of the Company’s investment in FHLB capital stock during 2016 or 2015. The FHLB has paid or declared dividends on its capital stock for all four quarters of the years ending December 31, 2016, 2015 and 2014. Subordinated Debentures The following table summarizes the terms of each issuance of subordinated debentures outstanding as of December 31, 2016 (dollars in thousands): Series Amount Issuance Maturity Rate Index Current Next Reset Trust I $ 6,186 12/10/04 03/15/35 3 month LIBOR+2.05 % 3.01 % 03/15/17 Trust II 3,093 12/23/05 03/15/36 3 month LIBOR+1.75 % 2.71 % 03/15/17 Trust III 3,093 06/30/06 09/15/36 3 month LIBOR+1.85 % 2.81 % 03/15/17 Subtotal 12,372 Unamortized fair value adjustment 2,516 Net $ 9,856 The following table summarizes the terms of each issuance of subordinated debentures outstanding as of December 31, 2015: Series Amount Issuance Maturity Rate Index Current Next Trust I $ 6,186 12/10/04 03/15/35 3 month LIBOR+2.05 % 2.56 % 03/15/16 Trust II 3,093 12/23/05 03/15/36 3 month LIBOR+1.75 % 2.26 % 03/15/16 Trust III 3,093 06/30/06 09/15/36 3 month LIBOR+1.85 % 2.36 % 03/15/16 Subtotal 12,372 Unamortized fair value adjustment 2,675 Net $ 9,697 The subordinated debentures were acquired as part of the PC Bancorp merger and were issued to trusts originally established by PC Bancorp, which in turn issued trust preferred securities. These subordinated debentures were issued in three separate series. Each issuance had a maturity of 30 years from their approximate date of issue. All three subordinated debentures are variable rate instruments that reprice quarterly based on the three month LIBOR plus a margin (see tables above). All three subordinated debentures had their interest rates reset in December 2016 at the current three month LIBOR plus their index, and will continue to reprice quarterly through their maturity date. All three subordinated debentures are currently callable at par with no prepayment penalties. The original fair value adjustment related to the subordinated debentures was $3.3 million. The Company recorded $159 thousand, $159 thousand, and $159 thousand in amortization expense related to the fair value adjustment in 2016, 2015, and 2014, respectively. At December 31, 2016 the Company is estimating a remaining life of approximately 20 years on the subordinated debentures and is amortizing the fair value adjustment based on this estimated average remaining life. The Company is projecting annual amortization expense of approximately $159 thousand related to the fair value adjustment on the subordinated debentures. Interest payments made by the Company on subordinated debentures are considered dividend payments under FRB regulations. Notification to the FRB is required prior to the Company declaring and paying a dividend during any period in which the Company’s quarterly net earnings are insufficient to fund the dividend amount. This notification requirement is included in regulatory guidance regarding safety and soundness surrounding capital and includes other non-financial measures such as asset quality, financial condition, capital adequacy, liquidity, future earnings projections, capital planning and credit concentrations. Should the FRB object to the dividend payments, the Company would be precluded from paying interest on the subordinated debentures after giving notice within 15 days before the payment date. Payments would not commence until approval is received or the Company no longer needs to provide notice under applicable guidance. The Company has the right, assuming no default has occurred, to defer payments of interest on the subordinated debentures at any time for a period not to exceed 20 consecutive quarters. The Company has not deferred any interest payments.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 14 – Derivative Financial Instruments The Company is exposed to certain risks relating to its ongoing business operations and utilizes interest rate swap agreements (“swaps”) as part of its asset/liability management strategy to help manage its interest rate risk position. The Company has two counterparty banks. Derivative Financial Instruments Acquired from 1 st At December 31, 2016, the Company has eleven interest rate swap agreements with customers and eleven offsetting interest-rate swaps with a counterparty bank that were acquired as a result of the merger with 1 st Enterprise on November 30, 2014. The swap agreements are not designated as hedging instruments. The purpose of entering into offsetting derivatives not designated as a hedging instrument is to provide the Company a variable-rate loan receivable and provide the customer the financial effects of a fixed-rate loan without creating significant interest rate risk in the Company’s earnings. The structure of the swaps is as follows: The Company enters into a swap with its customers to allow them to convert variable rate loans to fixed rate loans, and at the same time, the Company enters into a swap with the counterparty bank to allow the Company to pass on the interest-rate risk associated with fixed rate loans. The net effect of the transaction allows the Company to receive interest on the loan from the customer at a variable rate based on LIBOR plus a spread. The changes in the fair value of the swaps primarily offset each other and therefore should not have a significant impact on the Company’s results of operations. Our interest rate swap derivatives acquired from 1 st Enterprise are subject to a master netting arrangement with one counterparty bank. None of our derivative assets and liabilities are offset in the balance sheet. The Company believes the risk of loss associated with counterparty borrowers relating to interest rate swaps is mitigated as the loans with swaps are underwritten to take into account potential additional exposure, although there can be no assurances in this regard since the performance of the swaps is subject to market and counterparty risk. At December 31, 2016 and 2015, the total notional amount of the Company’s swaps acquired from 1 st Enterprise was $24 million and $28 million, respectively. The outstanding swaps have remaining maturities of up to 7 years as of December 31, 2016. The following tables presents the fair values of the asset and liability of the Company’s derivative instruments acquired from 1 st Enterprise as of the dates and periods indicated (dollars in thousands): Asset Derivatives December 31, 2016 December 31, 2015 Interest rate swap contracts fair value $523 $881 Balance sheet location Accrued Interest Accrued Interest The following table presents the fair values of the liability of the Company’s derivative instruments acquired from 1 st Enterprise as of the dates indicated (dollars in thousands): Liability Derivatives December 31, 2016 December 31, 2015 Interest rate swap contracts fair value $523 $881 Balance sheet location Accrued Interest Accrued Interest Derivative Financial Instruments Acquired from PC Bancorp At December 31, 2016, the Company also has fourteen pay-fixed, receive-variable, interest rate contracts that are designed to convert fixed rate loans into variable rate loans. The Company acquired these interest rate swap contracts on July 31, 2012 as a result of the merger with PC Bancorp. Out of the fourteen interest rate swap contracts at December 31, 2016, twelve are designated as hedging instruments and hedge accounting is applied. All of the interest rate swap contracts acquired from PC Bancorp are with the same counterparty bank. The outstanding swaps have remaining maturities of up to 5 years as of December 31, 2016. The following table presents the notional amount and the fair values of the asset and liability of the Company’s derivative instruments acquired from PC Bancorp as of the dates indicated (dollars in thousands): Liability Derivatives December 31, 2016 December 31, 2015 Fair Value Hedges Total interest rate contracts notional amount $ 17,642 $ 25,938 Derivatives not designated as hedging instruments: Interest rate swap contracts fair value $ 95 $ 313 Derivatives designated as hedging instruments: Interest rate swap contracts fair value 589 1,351 Total interest rate contracts fair value $ 684 $ 1,664 Balance sheet location Accrued Interest Payable Accrued Interest Payable The Effect of Derivative Instruments on the Consolidated Statements of Income The following table summarizes the effect of derivative financial instruments on the consolidated statements of income for the periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 2014 Derivatives not designated as hedging instruments: Interest rate swap contracts – loans Increase in fair value of interest rate swap contracts $ 218 $ 206 $ 219 Payments on interest rate swap contracts on loans (240 ) (263 ) (273 ) Net decrease in other non-interest income $ (22 ) $ (57 ) $ (54 ) Derivatives designated as hedging instruments: Interest rate swap contracts – loans Increase in fair value of interest rate swap contracts $ 762 $ 926 $ 927 Increase (decrease) in fair value of hedged loans 41 133 315 Payments on interest rate swap contracts on loans (821 ) (1,089 ) (1,256 ) Net decrease in interest income on loans $ (18 ) $ (30 ) $ (14 ) Under all of the Company’s interest rate swap contracts, the Company is required to pledge and maintain collateral for the credit support under these agreements. At December 31, 2016, the Company has pledged $1.8 million in investment securities and $2.7 million in certificates of deposit, for a total of $4.5 million, as collateral under the swap agreements.

Balance Sheet Offsetting

Balance Sheet Offsetting	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Balance Sheet Offsetting	Note 15 – Balance Sheet Offsetting Assets and liabilities relating to certain financial instruments, including derivatives, and securities sold under repurchase agreements (“Repos”), may be eligible for offset in the consolidated balance sheets. The Company’s interest rate swap derivatives are subject to a master bilateral netting and offsetting arrangement under specific conditions as defined within a master agreement governing all interest rate swap contracts that the Company and the counterparty banks have entered into. In addition, the master agreement under which the interest rate contracts have been written require the pledging of assets by the Company based on certain risk thresholds. The Company has pledged a certificate of deposit and investment securities as collateral under the swap agreements. The pledged collateral under the swap agreements are reported in the Company’s consolidated balance sheets, unless the Company defaults under the master agreement. The Company currently does not net or offset the interest rate swap contracts in its consolidated balance sheets, as reflected within the table below. The Company’s securities sold under repurchase agreements represent transactions the Company has entered into with several deposit customers. These transactions represent the sale of securities on an overnight or on a term basis to our deposit customers under an agreement to repurchase the securities from the customers the next business day or at maturity. There is an individual contract for each customer with only one transaction per customer. There is no master agreement that provides for the netting arrangement or the offsetting of these individual transactions or for the netting of collateral positions. The Company does not net or offset the Repos in its consolidated balance sheets as reflected within the table below. The table below presents the Company’s financial instruments that may be eligible for offsetting which include securities sold under agreements to repurchase that have no enforceable master netting arrangement and derivative securities that could be offset in the consolidated financial statements due to an enforceable master netting arrangement (dollars in thousands): Gross Gross Net Amounts in the Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Collateral December 31, 2016 Financial Assets: Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments) $ 523 $ — $ 523 $ 523 $ — $ — Total $ 523 $ — $ 523 $ 523 $ — $ — Financial Liabilities: Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments) $ 1,207 $ — $ 1,207 $ 1,207 $ 4,555 $ 3,348 Securities sold under agreements to repurchase 18,816 — 18,816 18,816 48,204 29,388 Total $ 20,023 $ — $ 20,023 $ 20,023 $ 52,759 $ 32,736 Gross Gross Net in the Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Collateral December 31, 2015 Financial Assets: Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments) $ 881 $ — $ 881 $ 881 $ — $ — Total $ 881 $ — $ 881 $ 881 $ — $ — Financial Liabilities: Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments) $ 2,545 $ — $ 2,545 $ 2,545 $ 4,759 $ 2,214 Securities sold under agreements to repurchase 14,360 — 14,360 14,360 46,596 32,236 Total $ 16,905 $ — $ 16,905 $ 16,905 $ 51,355 $ 34,450

Stock Options and Restricted St

Stock Options and Restricted Stock	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options and Restricted Stock	Note 16 – Stock Options and Restricted Stock Equity Compensation Plans The Company’s 2007 Equity and Incentive Plan (“Equity Plan”) was adopted by the Company in 2007 and replaced two prior equity compensation plans. The Equity Plan provides for significant flexibility in determining the types and terms of awards that may be made to participants. The Equity Plan was revised and approved by the Company’s shareholders in 2011 and adopted by the Company as part of the Bank holding company reorganization. This plan is designed to promote the interest of the Company in aiding the Company to attract and retain employees, officers and non-employee directors who are expected to contribute to the future success of the organization. The Equity Plan is intended to provide participants with incentives to maximize their efforts on behalf of the Company through stock-based awards that provide an opportunity for stock ownership. This plan provides the Company with a flexible equity incentive compensation program, which allows the Company to grant stock options, restricted stock, restricted stock award units and performance units. Certain options and share awards provide for accelerated vesting, if there is a change in control, as defined in the Equity Plan. The Equity Plan was amended and restated in 2014 to (i) permit the grant of performance-based awards that are not subject to the deduction limitations of Section 162(m) of the Internal Revenue Code, including both equity compensation awards and cash bonus payments, (ii) prohibit the repricing of previously granted options; (iii) eliminate a provision of the Equity Plan that provides for an automatic annual increase in the shares of common stock available for awards under the Equity Plan; and (iv) extend the term of the plan to July 31, 2024. Pursuant to the merger with 1 st Enterprise as discussed in Note 2 above, CU Bancorp adopted the 1 st Enterprise 2006 Stock Incentive Plan, as amended (“2006 Stock Incentive Plan”), as its own equity plan and all stock options granted by 1 st Enterprise thereunder were fully vested and exercisable and were converted to CU Bancorp stock options on substantially the same terms but adjusted to reflect the exchange ratio set forth in the Merger Agreement and applicable Internal Revenue Code provisions and related regulations. No new equity awards will be granted under the 2006 Stock Incentive Plan. A total of 802,766 converted 1 st Enterprise stock options were adopted into CU Bancorp stock options under the Equity Plan with a fair value of $9.6 million and an intrinsic value of $11 million at the merger date. Under the Equity Plan, there are a total of 1,490,547 shares authorized. A total of 1,129,892 shares have been issued out of the plan, with 80,916 of these issued shares subsequently cancelled and returned back into the plan, leaving 441,571 available to be issued. All non-qualified and incentive stock options granted under the current Equity Plan and the earlier 2005 equity compensation plans, have been issued with the exercise prices of the stock options equal to the fair market value of the underlying shares at the date of grant. The Equity Plan and the original 2005 equity compensation plans provided for the issuance of non-qualified and incentive stock options. These plans provided that each option must have an exercise price not less than the fair market value of the stock at the date of grant and terms to expiration not to exceed ten years. All options granted under the plans require continuous service and have been issued with vesting increments of between 20% through 50% per year. All stock options issued under the original 2005 equity compensation plans that have not expired remain outstanding with no changes in their vesting, maturity date or rights. At December 31, 2016, future compensation expense related to unvested restricted stock grants aggregated to the amounts reflected in the table below (dollars in thousands): Future Stock Based Compensation Expense Restricted Stock 2017 $ 2,081 2018 762 2019 220 2020 43 Thereafter — Total $ 3,106 At December 31, 2016, the weighted-average period over which the total compensation cost related to unvested restricted stock grants not yet recognized is 2.5 years. There was no future compensation expense related to stock options as of December 31, 2016. All stock options outstanding at December 31, 2016 are vested. The estimated fair value of both incentive stock options and non-qualified stock options granted in prior years, have been calculated using the Black-Scholes option pricing model. There have been no incentive stock options and no non-qualified stock options issued in 2014, 2015 or 2016. The following is the listing of the input variables and the assumptions utilized by the Company for each parameter used in the Black-Scholes option pricing model in prior years: Risk-free Rate Expected Life of Options Expected Volatility Dividend Yield Stock Options There were no stock options granted by the Company in 2014, 2015 or 2016. The following table summarizes the stock option activity under the plans for the year ended December 31, 2016: Shares Weighted Weighted (in years) Aggregate (in Outstanding stock options at December 31, 2015 557,471 $ 10.57 0.8 $ 8,248 Granted — Exercised (505,274 ) Forfeited — Expired (4,500 ) Outstanding stock options at December 31, 2016 47,697 $ 12.69 1.43 $ 1,102 Exercisable options at December 31, 2016 47,697 $ 12.69 1.43 $ 1,102 Unvested options at December 31, 2016 — The total intrinsic value of options exercised during the years ended December 31, 2016, 2015, and 2014 was $6.8 million, $6.5 million, and $2.1 million, respectively. Restricted Stock The weighted-average grant-date fair value per share in the table below is calculated by taking the total aggregate cost of the restricted shares issued divided by the number of shares of restricted stock issued. The aggregate cost of the restricted stock was calculated by multiplying the number of shares granted at each of the grant dates by the closing stock price of the Company’s common stock on the date of the grant. The following table summarizes the restricted stock activity under the Equity Plan for the year ended December 31, 2016 (dollars in thousands): Number Weighted-Average Restricted Stock: Unvested, at December 31, 2015 311,458 $ 19.29 Granted 142,309 23.80 Vested (160,310 ) 18.93 Cancelled and forfeited (11,375 ) 20.88 Unvested, at December 31, 2016 282,082 $ 21.98 Restricted stock compensation expense was $3.6 million, $2.7 million, and $1.7 million for the period ended December 31, 2016, 2015, and 2014, respectively. Restricted stock awards reflected in the table above are valued at the closing stock price on the date of grant and are expensed to stock based compensation expense over the period for which the related service is performed. The weighted-average grant-date fair value per share for restricted stock granted for 2016, 2015, and 2014 was $23.80, $21.51, and $19.39, respectively. The total fair value of shares vested during the year for 2016, 2015, and 2014 is $4.3 million, $2.7 million, and $2.3 million, respectively. In 2015, the Company granted 40 thousand shares of Restricted Stock Unit (“RSU”) under the Equity Plan to one of its executive officers. Such grant is reflected in the table above. The shares of common stock underlying the 40 thousand shares of RSU will not be issued until the RSUs vest and are not included in the Company’s shares outstanding as of December 31, 2016. The RSUs are valued at the closing stock price on the date of grant and are expensed to stock based compensation expense over the period for which the related service is performed. Excess Tax Benefits On July 1, 2016, and effective January 1, 2016, the Company early adopted ASU 2016-09 which provides improvements to the accounting for employee share-based payments. As a result of this new standard, excess tax benefits from exercise or vesting of share-based awards are included as a reduction in provision for income tax expense in the period in which the exercise or vesting occurs. The following table presents excess tax benefits recognized, by award type (dollars in thousands): Year Ended December 31, 2016 Number of Awards Related Excess Tax Stock Options 505,274 $ 914 Restricted Stock 160,310 523 Total 665,584 $ 1,437

Supplemental Executive Retireme

Supplemental Executive Retirement Plan and Other Deferred Compensation Plans	12 Months Ended
	Dec. 31, 2016
Postemployment Benefits [Abstract]
Supplemental Executive Retirement Plan and Other Deferred Compensation Plans	Note 17 – Supplemental Executive Retirement Plan and Other Deferred Compensation Plans The Company adopted a non-qualified supplemental executive retirement plan (“SERP”) for certain executives of the Company effective October 1, 2012. In addition, the Company acquired several SERP plans from the 2012 PC Bancorp acquisition. These SERP plans provide the designated executives with retirement benefits. Pre-retirement survivor benefits are provided for designated beneficiaries of participants who do not survive until retirement in an amount equal to the lump sum actuarial equivalent of the participant’s accrued benefit under the SERP. The SERP is considered an unfunded plan for tax and ERISA purposes. All obligations arising under the SERP are payable from the general assets of the Company. At December 31, 2016 and 2015, the SERP plan had accrued liabilities of $4.9 million and $3.3 million, respectively. As a result of its acquisition of 1 st Enterprise in 2014, the Company acquired a deferred compensation plan. This deferred compensation plan was established in which eligible employees can elect to defer a percentage of salary of bonuses to be paid after terminating employment with the Company. Payments can be made in lump sum or equal installments for as long as 10 years. A deferral account is established for each participant and the account will earn interest quarterly based on the Company’s established crediting rate. Participants are immediately 100% vested for the amount of their deferral account. For the years ended December 31, 2016, 2015 and 2014, the Company recognized deferred compensation expense of $1.0 million, $947 thousand and $705 thousand under this plan, respectively. The Company acquired, as a result of its acquisition of PC Bancorp, a Supplemental Employee Salary Continuation Plan, a Deferred Director Fee Plan, and a Split Dollar Employee Insurance Plan for certain executive officers and one Director of PC Bancorp. At December 31, 2016, the accrued liability of the PC Bancorp Supplemental Employee Salary Plan was $1.0 million, and the accrued liability of the Deferred Director Fee Plan was $251 thousand, and the accrued liability of the Split Dollar Employee Insurance Plan was $1.2 million. At December 31, 2015, the accrued liability of the PC Bancorp Supplemental Employee Salary Plan was $1.1 million, and the accrued liability of the Deferred Director Fee Plan was $282 thousand, and the accrued liability of the Split Dollar Employee Insurance Plan was $1.2 million. The Company recorded a total of $69 thousand, $68 thousand, and $72 thousand of expense for all plans acquired from PC Bancorp for the years ended December 31, 2016, 2015 and 2014.

Defined Contribution Plan 401(k

Defined Contribution Plan 401(k)	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Defined Contribution Plan 401(k)	Note 18 – Defined Contribution Plan 401(k) The Company has a 401(k) defined contribution plan for the benefit of its employees. The California United Bank 401(k) Profit Sharing Plan (the “401(k) Plan”) allows eligible employees to contribute a portion of their income to a trust for investment on a pre-tax basis until retirement. Participants are 100% vested in their own deferrals. The dollar amount an individual employee may contribute is subject to regulatory limits. In 2014 and 2015, the Company matched $0.50 on the dollar for every dollar the employee contributed to the plan, up to a maximum of 3% of the employee’s eligible compensation subject to an IRS limitation. In 2016, the Company matched $0.50 on the dollar for every dollar the employee contributed to the plan, up to a maximum of 2.5% of the employee’s eligible compensation subject to an IRS limitation. The Company’s expense relating to the contributions made to the 401(k) plan for the benefit of its employees was $548 thousand, $642 thousand and $418 thousand for the years ended December 31, 2016, 2015, and 2014, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Note 19 – Income Taxes The Company provides for current federal and state income taxes payable and for deferred taxes that result from differences between financial accounting rules and tax laws governing the timing of recognition of various income and expense items. The Company recognizes deferred income tax assets and liabilities for the future tax effects of such temporary differences based on the difference between the financial statement and tax bases of the existing assets and liabilities using the statutory rate expected in the years in which the differences are expected to reverse. The effect on deferred taxes of any enacted change in tax rates is recognized in income in the period that includes the enactment date. The future realization of any of the Company’s deferred tax assets ultimately depends on the existence of sufficient taxable income of the appropriate character (for example, ordinary income or capital gain) within the carryback or carryforward periods available under the tax law. Based on historical and future expected taxable earnings and available tax strategies, the Company concluded that it is more likely than not that all the benefit of the deferred tax assets will be realized, with the exception of the deferred tax assets related to certain capital loss carryforward from separate reporting years that are subject to limitation. The tax effects from an uncertain tax position are recognized in the financial statements only if, based on its merits, the position is more likely than not to be sustained on audit by the taxing authorities. The Company believes that there are no material uncertain tax positions at December 31, 2016, 2015, and 2014. Interest and penalties related to uncertain tax positions, if any, are recorded as part of other operating expense. Income tax expense consists of the following (dollars in thousands): Year Ended December 31, 2016 2015 2014 Current provision Federal $ 10,921 $ 9,265 $ 4,517 State 3,653 2,923 1,183 Total current provision 14,574 12,188 5,700 Deferred provision Federal 923 291 382 State 456 389 350 Total deferred provision 1,379 680 732 Total current and deferred provision $ 15,953 $ 12,868 $ 6,432 The following is a summary of the components of the net deferred tax assets recognized in the consolidated balance sheets as of the dates indicated (dollars in thousands): December 31, 2016 2015 Deferred Tax Assets Federal tax operating loss carryforward $ 60 $ 64 State tax operating loss carryforward 165 170 Allowance for loan loss 9,293 7,473 Purchase accounting and loan fair value adjustments 3,820 7,024 Accruals and other liabilities 929 958 Stock compensation and deferred compensation costs 4,618 5,732 Net unrealized loss on securities available-for-sale 2,190 593 Start up, organizational and other costs 244 332 Total deferred tax assets 21,319 22,346 Deferred Tax Liabilities State tax liability (64 ) (441 ) Unamortized fair value on subordinated debentures (1,153 ) (1,230 ) Core deposit intangibles (2,397 ) (2,984 ) Prepaid expense and other (518 ) (652 ) Total deferred tax liabilities (4,132 ) (5,307 ) Valuation allowance (6 ) (6 ) Deferred tax assets, net $ 17,181 $ 17,033 The Company’s deferred tax assets and deferred tax liabilities include balances associated with the acquisition of 1 st Enterprise in 2014, PC Bancorp in 2012 and COSB in 2010, which are non-taxable business combinations. These balances represent temporary differences for which deferred tax assets and liabilities are recognized because the financial statement carrying amounts of the acquired assets and assumed liabilities generally are their respective fair values at the date of the acquisition, whereas the tax basis equals the acquiree’s former tax basis (carryover tax basis). In addition, the Company has a state tax capital loss carryforward acquired from the PC Bancorp acquisition of $54 thousand at December 31, 2016 and at December 31, 2015. The capital loss carryforward expired in 2016. The Company has a $1.2 million state net operating loss carryforward at CU Bancorp that arose from CU Bancorp’s 2012 separately filed tax return. The ability to utilize this net operating loss is dependent upon allocation of sufficient consolidated income to CU Bancorp in the future based on a three-factor formula. In assessing the need for a valuation allowance against these losses, the Company carefully weighed both positive and negative evidence currently available. Based upon the evidence, the Company concluded it is more likely than not that these net operating losses will be realized before the expiration in 2032. The Company also has a $172 thousand capital loss carryforward that was generated in 2014. The Company concluded it is more likely than not that this capital loss carryforward will be realized before the expiration in 2019. The Company’s investments in Qualified Affordable Housing Projects generated low income housing tax credits and benefits net of investment amortization of $92 thousand and $107 thousand in 2016 and 2015, respectively. See Note 11- Investments in Qualified Affordable Housing Projects for a discussion on the investments. On July 1, 2016, and effective January 1, 2016, the Company early adopted ASU 2016-09 which provides improvements to the accounting for employee share-based payments. As a result of this new standard, excess tax benefits from exercise or vesting of share-based awards are included as a reduction in provision for income tax expense in the period in which the exercise or vesting occurs. See Note 16, Stock Options and Restricted Stock under “Excess Tax Benefits” for additional information. The following table presents a reconciliation of the statutory income tax rate to the consolidated effective income tax rate for each of the periods indicated (dollars in thousands): For Years Ended December 31, 2016 2015 2014 Amount Percent Amount Percent Amount Percent Federal income tax expense at statutory rate $ 15,193 35.00 % $ 11,937 35.00 % $ 5,369 35.00 % State franchise taxes, net of federal benefit, excluding LIHTC investments 2,743 6.32 2,236 6.55 1,209 7.88 Release of state valuation allowance on use of net operating loss — — (29 ) (0.09 ) (68 ) (0.44 ) Meals and entertainment, dues and other non-deductible items 142 0.33 132 0.39 75 0.49 Cash surrender life insurance (456 ) (1.05 ) (453 ) (1.33 ) (231 ) (1.51 ) Stock compensation expense (68 ) (0.16 ) (100 ) (0.29 ) (53 ) (0.35 ) Excess tax benefit from stock transactions (1,196 ) (2.75 ) — — — — LIHTC investments (111 ) (0.25 ) (141 ) (0.41 ) (119 ) (0.77 ) Merger costs — — — — 515 3.36 Tax Exempt Income (290 ) (0.67 ) (314 ) (0.92 ) — — Other (4 ) (0.01 ) (400 ) (1.17 ) (265 ) (1.73 ) $ 15,953 36.76 % $ 12,868 37.73 % $ 6,432 41.93 % The Company’s federal income tax returns for the years ended December 31, 2013 through 2015 are open for examination by federal taxing authorities and the Company’s state income tax returns for the years ended December 2012 through 2015 are open for examination by state taxing authorities. During 2016, the Company concluded an examination by the California Franchise Tax Board of the Enterprise Zone net interest deduction that the Company included in its California 2011 and 2012 tax returns. The California Franchise Tax Board has issued a closing letter with no material adjustments that impact the consolidated financial statements. The Company has not been notified of any other pending tax examinations by taxing authorities.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Shareholders' Equity	Note 20 – Shareholders’ Equity Common Stock Holders of shares of the Company’s common stock are entitled to one vote for each share held of record on all matters voted upon by shareholders. Furthermore, the holders of the Company’s common stock have no preemptive rights to subscribe for new issue securities, and shares of the Company’s common stock are not subject to redemption, conversion, or sinking fund provisions. With respect to the payment of dividends, after the preferential dividends upon all other classes and series of stock entitled thereto have been paid or declared and set apart for payment, then the holders of the Company’s common stock are entitled to such dividends as may be declared by the Company’s board of directors out of funds legally available under the laws of the State of California. Refer to Note 22—Regulatory Matters for further discussion on restrictions on dividends. Upon the Company’s liquidation or dissolution, the assets legally available for distribution to holders of the Company’s shares of common stock, after payment of all the Company’s obligations and payment of any liquidation preference of all other classes and series of stock entitled thereto, including the Company’s preferred stock, are distributable ratably among the holders of the Company’s common stock. During 2016, the Company issued 505,274 shares of stock from the exercise of employee stock options for a total value of $5.2 million. The Company also issued 142,309 shares of restricted stock to the Company’s directors and employees, cancelled 11,375 shares of unvested restricted stock related to employee turnover and cancelled 52,591 shares of restricted stock that had a value of $1.4 million when employees elected to pay their tax obligation via the repurchase of the stock by the Company. The Equity Plan, as amended, allows employees to make an election to have a portion of their restricted stock that became vested during the year repurchased by the Company to provide funds to pay the employee’s tax obligation related to the vesting of the stock. See Note 16 – Stock Options and Restricted Stock under “Equity Compensation Plans” for a more detailed analysis related to the issuances of these shares. Preferred Stock As discussed in Note 2, Business Combinations, the Company completed the merger with 1 st Enterprise on November 30, 2014. As part of the Merger Agreement, 16,400 shares of preferred stock issued by 1 st Enterprise as part of the Small Business Lending Fund (SBLF) program of the United States Department of the Treasury was converted into 16,400 CU Bancorp shares with substantially identical terms. CU Bancorp Preferred Stock has a liquidation preference amount of $1 thousand per share, designated as the Company’s Non-Cumulative Perpetual Preferred Stock, Series A. The U.S. Department of the Treasury is the sole holder of all outstanding shares of CU Bancorp Preferred Stock. The CU Bancorp Preferred Stock had an estimated life of four years and the fair value was $16 million at the merger date, resulting in a net discount of $479 thousand. The life-to-date accretion on the net discount as of December 31, 2016 is $1.0 million. Dividends on the Company’s Series A Preferred Stock are payable quarterly in arrears if authorized and declared by the Company’s board of directors out of legally available funds, on a non-cumulative basis, on the $1 thousand per share liquidation preference amount. Dividends are payable on January 1, April 1, July 1 and October 1 of each year. The current coupon dividend rate was adjusted to 9% on March 1, 2016 through perpetuity. However, the dividend yield through November 30, 2018 approximates 7% as a result of business combination accounting. Dividends on the Series A Preferred Stock are non-cumulative. There is no sinking fund with respect to dividends on the Series A Preferred Stock. So long as the Company’s Series A Preferred Stock remains outstanding, the Company may declare and pay dividends on the common stock only if full dividends on all outstanding shares of Series A Preferred Stock for the most recently completed dividend period have been or are contemporaneously declared and paid. In the event of any voluntary or involuntary liquidation, dissolution or winding up of the affairs of the Company, holders of the Series A Preferred Stock will be entitled to receive for each share of Series A Preferred Stock, out of the Company’s assets or proceeds available for distribution to the Company’s shareholders, subject to any rights of the Company’s creditors, before any distribution of assets or proceeds is made to or set aside for the holders of the common stock, payment of an amount equal to the sum of (i) the $1 thousand liquidation preference amount per share and (ii) the amount of any accrued and unpaid dividends on the Series A Preferred Stock. To the extent the assets or proceeds available for distribution to shareholders are not sufficient to fully pay the liquidation payments owing to the holders of the Series A Preferred Stock and the holders of any other class or series of the stock ranking equally with the Series A Preferred Stock, the holders of the Series A Preferred Stock and such the Company’s stock will share ratably in the distribution. Holders of the Series A Preferred Stock have no right to exchange or convert their shares into common stock or any other securities and do not have voting rights. Accumulated Other Comprehensive Income (Loss) The following table presents the changes in accumulated other comprehensive income (loss) by component for the periods indicated (dollars in thousands): For the Year Ended December 31, 2016 2015 2014 Statement of Beginning balance, net of tax $ (816 ) $ 190 $ (205 ) Net unrealized gain (loss) arising during the period (3,543 ) (1,624 ) 628 Related tax effect 1,490 683 (260 ) Reclassification of (gain) loss on investment securities available-for-sale to net income (258 ) (112 ) 47 Gain on sale of Related tax effect 108 47 (20 ) Provision for Other Comprehensive Income (Loss) (2,203 ) (1,006 ) 395 Ending balance $ (3,019 ) $ (816 ) $ 190

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 21 – Commitments and Contingencies Financial Instruments with Off Balance Sheet Risk In the normal course of business, the Company is a party to financial instruments with off-balance sheet risk. These financial instruments include commitments to extend credit. To varying degrees, these instruments involve elements of credit and interest rate risk in excess of the amount recognized in the balance sheet. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instruments for commitments to extend credit is represented by the contractual amount of those instruments. 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. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Some of the Company’s commitments are expected to expire without being drawn upon, with the total commitment amounts not necessarily representing future cash funding requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained if deemed necessary by the Company upon extension of credit is based on management’s credit evaluation of the borrower. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, income-producing commercial properties, residential properties and properties under construction. Financial instruments with off balance sheet risk include commitments to extend credit of $1 billion and $806 million at December 31, 2016 and 2015, respectively. Included in the aforementioned commitments were standby letters of credit outstanding of $85 million and $73 million at December 31, 2016 and 2015, respectively. As of December 31, 2016 and 2015, the Company had established a reserve for estimated losses on unfunded loan commitments of $886 thousand and $608 thousand, respectively. These balances are included in other liabilities on the balance sheet. Litigation From time to time the Company is a party to claims and legal proceedings arising in the ordinary course of business. The Company accrues for any probable loss contingencies that are estimable and discloses any material losses. As of December 31, 2016, there were no legal proceedings against the Company the outcome of which are expected to have a material adverse impact on the Company’s financial position, results of operations or cash flows, as a whole.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Regulatory Matters	Note 22 – Regulatory Matters The Company (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital requirements that involve quantitative measures of the Company’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. The Company currently includes in Tier 1 capital an amount of subordinated debentures equal to no more than 25% of the sum of all core capital elements, which is generally defined as shareholders’ equity less goodwill, core deposit intangibles and a portion of the SBA servicing assets. On July 2, 2013, the Board of Governors of the Federal Reserve System (“Federal Reserve”) approved a final rule (the “Final Rule”) that revises the current capital rules for U.S. banking organizations including the capital rules for the Company. The FDIC adopted the rule as an “interim final rule” on July 9, 2013. The Final Rule implements the regulatory capital reforms recommended by the Basel Committee. The Final Rule permanently grandfathers non-qualifying capital instruments, such as trust preferred securities and cumulative perpetual preferred stock issued before May 19, 2010, for inclusion in the Tier 1 Risk-based capital of banking organizations with total consolidated assets less than $15 billion as of December 31, 2009, such as the Company. As a result, the Company’s trust preferred securities will continue to be included in Tier 1 Risk-Based Capital. The Company also currently includes in its Tier 1 capital an amount of Non-Cumulative Perpetual Preferred Stock, Series A issued under the SBLF program. The U.S. Department of the Treasury is the sole holder of all outstanding shares of CU Bancorp Preferred Stock. Under the Final Rule, the CU Bancorp Preferred Stock will continue to be included in Tier 1 risk-based capital. At December 31, 2016, the respective capital ratios of the Company and the Bank exceeded the minimum percentage requirements to be deemed “well-capitalized” for Prompt Corrective Action (“PCA”) purpose and the Basel III minimum capital ratios with buffer (effective January 1, 2016) under the current capital guidelines. The following tables present the regulatory capital ratios requirements and the actual capitalization levels of the Company and the Bank as of the dates indicated (dollars in thousands): CU Bancorp December 31, December 31, Well Basel III Amount Amount (greater than or equal to) Regulatory Capital Ratios: Tier 1 leverage ratio 9.72 % 9.67 % 5.0 % NA Common Equity Tier 1 ratio 9.61 % 9.61 % 6.5 % 5.125 % Total Tier 1 risk-based capital ratio 10.68 % 10.85 % 8.0 % 6.625 % Total risk-based capital ratio 11.44 % 11.54 % 10.0 % 8.625 % Regulatory Capital Data: Common Equity Tier 1 $ 257,105 $ 223,977 Total Tier 1 capital 285,843 252,681 Total risk-based capital 306,103 268,971 Average total assets* 2,940,790 2,611,774 Risk-weighted assets 2,675,987 2,329,770 California United Bank: December 31, December 31, Well Capitalized Basel III Amount Amount (greater than or equal to) Regulatory Capital Ratios: Tier 1 leverage ratio 9.35 % 9.34 % 5.0 % NA % Common Equity Tier 1 ratio 10.28 % 10.47 % 6.5 % 5.125 % Total Tier 1 risk-based capital ratio 10.28 % 10.47 % 8.0 % 6.625 % Total risk-based capital ratio 11.04 % 11.17 % 10.0 % 8.625 % Regulatory Capital Data: Common Equity Tier 1 $ 275,151 $ 243,989 Tier 1 capital 275,151 243,989 Total risk-based capital 295,411 260,279 Average total assets * 2,941,253 2,612,206 Risk-weighted assets 2,677,030 2,329,798 * Represents the average total assets for the leverage ratio Restrictions on Dividends As discussed in Note 2, Business Combinations, the Company completed the merger with 1 st Enterprise on November 30, 2014. As part of the Merger Agreement, 16,400 shares of preferred stock issued by 1 st Enterprise as part of the SBLF program of the United States Department of Treasury was converted into substantially 16,400 identical shares with identical terms. In December 2016, the Board approved a quarterly dividend payment on the preferred shares of $369 thousand to the United States Department of the Treasury. Payment of stock or cash dividends in the future will depend upon earnings, liquidity, financial condition and other factors deemed relevant by our Board of Directors. Notification to the FRB is required prior to declaring and paying a dividend to shareholders that exceeds earnings for the period for which the dividend is being paid. This notification requirement is included in regulatory guidance regarding safety and soundness surrounding capital and includes other non-financial measures such as asset quality, financial condition, capital adequacy, liquidity, future earnings projections, capital planning and credit concentrations. Should the FRB object to dividend payments, the Company would be precluded from declaring and paying dividends until approval is received or the Company no longer needs to provide notice under applicable guidance. California law also limits the Company’s ability to pay dividends. A corporation may make a distribution/dividend from retained earnings to the extent that the retained earnings exceed (a) the amount of the distribution plus (b) the amount if any, of dividends in arrears on shares with preferential dividend rights. Alternatively, a corporation may make a distribution/dividend, if, immediately after the distribution, the value of its assets equals or exceeds the sum of (a) its total liabilities plus (b) the liquidation preference of any shares which have a preference upon dissolution over the rights of shareholders receiving the distribution/dividend. The Bank is subject to certain restrictions on the amount of dividends that may be declared without regulatory approval. Such dividends shall not exceed the lesser of the Bank’s retained earnings or net income for its last three fiscal years less any distributions to shareholders made during such period. In addition, the Bank may not pay dividends that would result in its capital being reduced below the minimum requirements shown above for capital adequacy purposes. Consent Order On September 23, 2016, California United Bank (the “Bank”), the wholly owned subsidiary of CU Bancorp (the “Company”) entered into a Stipulation to the Issuance of a Consent Order with its bank regulatory agencies, the Federal Deposit Insurance Corporation (“FDIC”) and the California Department of Business Oversight (“CDBO”), consenting to the issuance of a consent order (the “Consent Order”) relating to weaknesses in the Bank’s Bank Secrecy Act and Anti-Money Laundering (collectively “BSA”) compliance program. In consenting to the issuance of the Consent Order, the Bank did not admit or deny any charges of unsafe or unsound banking practices related to the BSA compliance program. Under the terms of the Consent Order the Bank and/or its Board of Directors is required to take certain actions which include, but are not limited to: a) Increasing Board supervision of the BSA compliance program; b) Notification to the regulatory agencies prior to appointment of a new BSA Officer or the executive to whom the BSA Officer reports; c) Formulation of a written action plan describing the actions to be taken to correct BSA/AML related deficiencies, a revised, written BSA/AML compliance program and review and enhancement of the Bank’s BSA risk assessment; d) Performance of a review of BSA staffing needs; e) Enhancement of internal controls to ensure full compliance with the BSA; f) Establishment of an independent testing program for compliance with the BSA rules and regulations; and g) Obtaining regulatory agency consent for expansionary activities such as new branches, offices, delivery channels, products and services. The Consent Order resulted in additional BSA compliance expenses for the Bank and the Company. It may also have the effect of limiting or delaying the Bank’s and the Company’s ability to obtain regulatory approval for certain expansionary activities, to the extent desired by the Company. The Consent Order does not otherwise impact the Bank’s business activities outside of BSA. The Consent Order does not require the Bank to pay any civil money penalty or require additional capital. The Consent Order will remain in effect and be enforceable until it is modified, terminated, suspended or set aside by the FDIC and the CBDO. Management and the Board have expressed their full intention to comply with all parts of the Consent Order at the earliest possible date.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 23 – Fair Value Measurements Fair Value Hierarchy Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for an asset or liability in an orderly transaction between market participants at the measurement date. In accordance with ASC Topic 825, the Company groups its financial assets and financial liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are as follows: • Level 1 – Observable unadjusted quoted market prices in active markets for identical assets and liabilities that the reporting entity has the ability to access at the measurement date. • Level 2 – Significant other observable market based inputs, other than Level 1 prices such as quoted prices for similar assets or liabilities or unobservable inputs that are corroborated by market data. This includes quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data, either directly or indirectly. This would include those financial instruments that are valued using models or other valuation methodologies where substantially all of the assumptions are observable in the marketplace, can be derived from observable market data or are supported by observable levels at which transactions are executed in the marketplace. • Level 3 – Significant unobservable inputs that reflect a reporting entity’s evaluation about the assumptions that market participants would use in pricing an asset or liability. Assets measured utilizing level 3 are for positions that are not traded in active markets or are subject to transfer restrictions, and or where valuations are adjusted to reflect illiquidity and or non-transferability. These assumptions are not corroborated by market data. This is comprised of financial instruments whose fair value is estimated based on internally developed models or methodologies utilizing significant inputs that are generally less readily observable from objective sources. Management uses a combination of reviews of the underlying financial statements, appraisals and management’s judgment regarding credit quality to determine the value of the financial asset or liability. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Management maximizes the use of observable inputs and attempts to minimize the use of unobservable inputs when determining fair value measurements. ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities that are measured and reported at fair value on a recurring basis and on a non-recurring basis. Securities available-for-sale and interest rate swaps are recorded at fair value on a recurring basis. Additionally, certain assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances, for example, when there is evidence of impairment. These include assets that are measured at the lower of cost or fair value, such as other real estate owned, SBA servicing asset and impaired loans that are collateral dependent. The estimated fair value amounts have been determined by the Company using available market information and appropriate valuation methodologies. However, considerable judgment is required to develop the estimates of fair value. Accordingly, the estimates presented below are not necessarily indicative of the amounts the Company could have realized in a current market exchange as of December 31, 2016. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. Recurring Fair Value Measurements The valuation methodologies for estimating the fair value of financial assets and financial liabilities measured and reported at fair value on a recurring basis are discussed below. Investment Securities Available-for-Sale Interest Rate Swap Contracts The following table presents the financial assets and financial liabilities measured at fair value on a recurring basis as of the dates indicated, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands): Fair Value Quoted Prices Significant Significant Financial Assets – December 31, 2016 Investment securities available-for-sale: U.S. Govt Agency and Sponsored Agency – Note Securities $ 9,969 $ — $ 9,969 — U.S. Govt Agency – SBA Securities 122,850 — 122,850 — U.S. Govt Agency – GNMA Mortgage-Backed Securities 22,370 — 22,370 — U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities 238,900 — 238,900 — Asset Backed Securities 6,896 — 6,896 — U.S. Treasury Notes 68,965 68,965 — — Interest Rate Swap Contracts 523 — 523 — $ 470,473 68,965 401,508 — Financial Liabilities – December 31, 2016 Interest Rate Swap Contracts $ 1,207 $ — $ 1,207 $ — Financial Assets – December 31, 2015 Investment securities available-for-sale: U.S. Govt Agency and Sponsored Agency –Note Securities $ 1,014 $ — $ 1,014 — U.S. Govt Agency – SBA Securities 93,490 — 93,490 — U.S. Govt Agency – GNMA Mortgage-Backed Securities 30,700 — 30,700 — U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities 97,154 — 97,154 — Corporate Securities 4,023 — 4,023 — Municipal Securities 1,011 — 1,011 — Asset Backed Securities 7,647 — 7,647 — U.S. Treasury Notes 80,746 80,746 — — Interest Rate Swap Contracts 881 — 881 — $ 316,666 80,746 235,920 — Financial Liabilities – December 31, 2015 Interest Rate Swap Contracts $ 2,545 $ — $ 2,545 $ — At December 31, 2016 and 2015, the Company had no financial assets or liabilities that were measured at fair value on a recurring basis that required the use of significant unobservable inputs (Level 3). Furthermore, there were no transfers of assets either between Level 1 and Level 2 nor in or out of Level 3 of the fair value hierarchy for assets measured on a recurring basis for the periods ended December 31, 2016 and 2015. Nonrecurring Fair Value Measurements The valuation methodologies for estimating the fair value of certain assets measured and reported at fair value on a nonrecurring basis are discussed below. Other Real Estate Owned SBA Servicing Asset Impaired Loans The following table presents the balances of assets measured at fair value on a non-recurring basis by level within the fair value hierarchy as of the dates indicated (dollars in thousands): Net Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) Financial Assets – December 31, 2016 Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans) $ 73 $ — $ — $ 73 SBA Servicing Asset 940 — — 940 Total $ 1,013 $ — $ — $ 1,013 Net Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) Financial Assets – December 31, 2015 Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans) $ — $ — $ — $ — SBA Servicing Asset 1,147 — — 1,147 Other real estate owned 325 — — 325 Total $ 1,472 $ — $ — $ 1,472 There were no transfers of assets either between Level 1 and Level 2 nor in or out of Level 3 of the fair value hierarchy for assets measured on a non-recurring basis for the periods ended December 31, 2016 and 2015. The following table presents losses related to nonrecurring fair value measurements. The losses related to assets held on the balance sheet at each respective period end (dollars in thousands): For the Year Ended December 31, 2016 2015 2014 Financial Assets Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans) $ 508 $ — $ 222 SBA Servicing Asset — — — Other real estate owned — 133 — Total $ 508 $ 133 $ 222 The following table presents the significant unobservable inputs used in the fair value measurements for Level 3 assets measured at fair value on a non-recurring basis as of the dates indicated (dollars in thousands): Fair Value Valuation Methodology Unobservable Unobservable Financial Assets – December 31, 2016 Collateral dependent impaired loans with specific valuation allowance and/or partial charge-off $ 73 Credit loss Credit loss factors 20% Discount Rates 13% SBA Servicing Asset 940 Discounted Cash Estimated Average 39 months Total $ 1,013 Financial Assets – December 31, 2015 Discount Rates 12% SBA Servicing Asset 1,147 Discounted Cash Estimated Average 61 months Other real estate owned 325 Broker opinion of Sales approach Estimated selling 6% Total $ 1,472 — — Fair Value of Financial Instruments The following are the valuation methodologies utilized for estimating the fair value of certain financial instruments presented in the tables below. Cash and due from banks Interest earning deposits in other financial institutions short-term Investment Securities Held-to-Maturity: Loans Bank owned life insurance FHLB Stock Non-Maturing Deposits Maturing Deposits Securities Sold under Agreements to Repurchase (“Repos”) Subordinated Debentures Fair Value of Commitments : The table below presents the carrying amounts and fair values of certain financial instruments based on their fair value hierarchy indicated (dollars in thousands): Fair Value Measurements Carrying Estimated Quoted Significant Significant December 31, 2016 Financial Assets Cash and due from banks $ 41,281 $ 41,281 $ 41,281 $ — $ — Interest earning deposits in other financial institutions 167,789 167,789 167,789 — — Investment securities held-to-maturity 42,027 41,937 — 41,937 — Loans, net 2,030,852 2,054,701 — — 2,054,701 Bank owned life insurance 51,216 51,216 — — 51,216 FHLB Stock 9,182 9,182 — — 9,182 Financial Liabilities Certificates of deposit 29,480 29,480 — 29,480 — Securities sold under agreements to repurchase 18,816 18,816 — 18,816 — Subordinated debentures 9,856 12,372 — 12,372 — December 31, 2015 Financial Assets Cash and due from banks $ 50,960 $ 50,960 $ 50,960 $ — $ — Interest earning deposits in other financial institutions 171,103 171,103 171,103 — — Investment securities held-to-maturity 42,036 42,339 — 42,339 — Loans, net 1,817,481 1,851,220 — — 1,851,220 Bank owned life insurance 49,912 49,912 — — 49,912 FHLB Stock 8,014 8,014 — — 8,014 Financial Liabilities — Certificates of deposit 58,502 58,502 — 58,502 — Securities sold under agreements to repurchase 14,360 14,360 — 14,360 — Subordinated debentures 9,697 12,372 — 12,372 —

Reclassification

Reclassification	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Reclassification	Note 24 – Reclassification Certain amounts in the prior year’s consolidated financial statements and related disclosures were reclassified to conform to the current year presentation with no effect on previously reported net income or shareholders’ equity.

Summary Quarterly Data (unaudit

Summary Quarterly Data (unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Summary Quarterly Data (unaudited)	Note 25 – Summary Quarterly Data (unaudited) 2016 Quarters Ended 2015 Quarters Ended (Dollars in thousands, except per share data) Dec. Sept. June Mar. Dec. Sept. June Mar. Interest income $ 26,151 $ 25,855 $ 24,997 $ 24,249 $ 23,807 $ 23,106 $ 21,941 $ 21,288 Interest expense 820 807 748 771 705 704 668 646 Net interest income 25,331 25,048 24,249 23,478 23,102 22,402 21,273 20,642 Provision for loan losses 882 697 1,063 622 2,249 705 683 1,443 Net interest income after provision for loan losses 24,449 24,351 23,186 22,856 20,853 21,697 20,590 19,199 Non-interest income 3,159 3,058 2,975 2,820 3,039 2,988 3,095 2,608 Non-interest expense 16,401 16,767 15,089 15,187 15,073 15,067 14,912 14,913 Net income before provision for income tax expense 11,207 10,642 11,072 10,489 8,819 9,618 8,773 6,894 Provision for income tax expense 4,037 4,059 3,952 3,905 3,312 3,355 3,506 2,695 Net Income $ 7,170 $ 6,583 $ 7,120 $ 6,584 $ 5,507 $ 6,263 $ 5,267 $ 4,199 Preferred stock dividends and discount accretion or premium amortization $ 303 $ 304 $ 307 $ 303 $ 297 $ 293 $ 312 $ 272 Net Income Available to Common Shareholders $ 6,867 $ 6,279 $ 6,813 $ 6,281 $ 5,210 $ 5,970 $ 4,955 $ 3,927 Basic income per share $ 0.39 $ 0.36 $ 0.40 $ 0.37 $ 0.31 $ 0.36 $ 0.30 $ 0.24 Diluted income per share $ 0.39 $ 0.36 $ 0.39 $ 0.36 $ 0.30 $ 0.35 $ 0.29 $ 0.23

Condensed Financial Information

Condensed Financial Information of Parent Company	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information of Parent Company	Note 26 – Condensed Financial Information of Parent Company The following tables present the parent company only condensed balance sheets and the related statements of income and condensed statements of cash flows for the dates and periods indicated (dollars in thousands): Parent Company Only Condensed Balance Sheets December 31, 2016 2015 ASSETS Cash and due from banks $ 9,715 $ 6,756 Loans 148 882 Investment in subsidiary 339,683 310,263 Accrued interest receivable and other assets 463 4 Total Assets $ 350,009 $ 317,905 LIABILITIES Subordinated debentures $ 9,856 $ 9,697 Accrued interest payable and other liabilities 1,968 1,401 Total Liabilities 11,824 11,098 SHAREHOLDERS’ EQUITY 338,185 306,807 Total Liabilities and Shareholders’ Equity $ 350,009 $ 317,905 Parent Company Only Condensed Statements of Income Years Ended 2016 2015 Interest Income $ 59 $ 71 Interest Expense 487 438 Operating Expenses 649 676 Total Expenses 1,136 1,114 Loss Before Income Tax Benefit and Equity in Undistributed Earnings of Subsidiary (1,077 ) (1,043 ) Income tax benefit 478 466 Loss Before Equity in Undistributed Earnings of Subsidiary (599 ) (577 ) Equity in undistributed earnings of subsidiary 28,056 21,813 Net Income $ 27,457 $ 21,236 Parent Company Only Condensed Statements of Cash Flows Years Ended 2016 2015 Cash flows from operating activities: Net income: $ 27,457 $ 21,236 Adjustments to reconcile net income to net cash used in operating activities: Equity in undistributed earnings of subsidiary (28,056 ) (21,813 ) Net accretion of discounts/premiums (10 ) (19 ) Accretion of subordinated debenture discount 159 159 Increase in accrued interest receivable and other assets (536 ) (27 ) Increase (decrease) in accrued interest payable and other liabilities 644 (84 ) Net cash used in operating activities (342 ) (548 ) Cash flows from investing activities: Capital contribution made to subsidiary — (1,000 ) Net decrease in loans 744 547 Net cash (used in) provided by investing activities 744 (453 ) Cash flows from financing activities: Net proceeds from exercise of stock options 5,185 4,299 Restricted stock repurchase (1,371 ) (971 ) Dividends paid on preferred stock (1,257 ) (183 ) Net cash provided by financing activities 2,557 3,145 Net increase in cash 2,959 2,144 Cash, beginning of year 6,756 4,612 Cash, end of year $ 9,715 $ 6,756 Supplemental disclosures of cash flow information: Cash paid during the period for interest $ 328 $ 277

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	Note 27 – Related Party Transactions During 2016 and 2015, there were no existing transactions that are out of the ordinary course of business between CU Bancorp and its affiliates, including executive officers, directors, principal shareholders (beneficial owners of 5% or more of our Common Stock), or the immediate family or associates of any of the foregoing persons, or trust for the benefit of employees such as a 401(k) trust. Some of CU Bancorp’s directors and executive officers, as well as the companies with which such directors and executive officers are associated, are customers of, and have had banking transactions with California United Bank in the ordinary course of business. All such transactions are on substantially the same terms, including interest and collateral as those prevailing for comparable transactions with others. At the present time, California United Bank has one lending relationship with its directors and officers or entities associated with any of its directors or officers. California United Bank also engages in deposit transactions with its executive officers and directors, and their immediate family or corporations of which the directors or officers may own a controlling interest, or also serve as directors or officers. These transactions are expected to take place on substantially the same terms, including interest, as those prevailing for comparable transactions with others.

Summary of Significant Accoun37

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation The consolidated financial statements include the accounts of the Company and the Bank. Significant intercompany items have been eliminated in consolidation. The accounting and reporting policies of the Company conform to U.S. generally accepted accounting principles (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission. CU Bancorp is the common shareholder of Premier Commercial Statutory Trust I, Premier Commercial Statutory Trust II and Premier Commercial Statutory Trust III. These trusts were established for the sole purpose of issuing trust preferred securities and do not meet the criteria for consolidation. For more detail, see Note 13 – Borrowings and Subordinated Debentures.
Use of Estimates in the Preparation of Consolidated Financial Statements	Use of Estimates in the Preparation of Consolidated Financial Statements The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In addition, these accounting principles require the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements. Estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan loss and various assets and liabilities measured at fair value on a recurring and nonrecurring basis. While management uses the most current available information to recognize losses on loans, future additions to the allowance for loan loss may be necessary based on, among other factors, changes in local economic conditions.
Business Combinations	Business Combinations The Company has a number of fair value adjustments recorded within the consolidated financial statements at December 31, 2016 that relate to the business combinations with California Oaks State Bank “COSB”, Premier Commercial Bancorp “PC Bancorp” and 1 st Enterprise Bank “1 st Enterprise” on December 31, 2010, July 31, 2012 and November 30, 2014, respectively. These fair value adjustments includes goodwill, fair value adjustments on loans, core deposit intangible assets, other intangible assets, fair value adjustments to acquired lease obligations, fair value adjustments to certificates of deposit and fair value adjustments on derivatives. The assets and liabilities acquired through acquisitions have been accounted for at fair value as of the date of the acquisition. The goodwill that was recorded on the transactions represented the excess of the purchase price over the fair value of net assets acquired.
Business Segments	Business Segments The Company is organized and operates as a single reporting segment, principally engaged in commercial business banking. The Company conducts its lending and deposit operations through nine full service branch offices located in Los Angeles, Orange, Ventura and San Bernardino counties.
Cash and Cash Equivalents	Cash and Cash Equivalents Within the Consolidated Statements of Cash Flows, cash and cash equivalents include cash, due from banks and interest earning deposits in other financial institutions. Cash flows from loans, deposits, securities sold under agreements to repurchase and certificates of deposit in other financial institutions are reported on a net basis.
Restricted Cash	Restricted Cash Banking regulations require that all banks maintain a percentage of their deposits as reserves in cash or on deposit with the Federal Reserve Bank. Reserve balances of $16 million and $14 million were required by the Federal Reserve Bank of San Francisco as of December 31, 2016 and 2015, respectively. As of December 31, 2016, the Bank was in compliance with all known U.S. Federal Reserve Bank (“Federal Reserve”) reporting and reserve requirements. The Company’s restricted cash is included in interest earning deposits in other financial institutions on the accompanying consolidated balance sheets.
Interest Earning Deposits in Other Financial Institutions	Interest Earning Deposits in Other Financial Institutions Interest earning deposits in other financial institutions represent short term interest earning deposits, which include money market deposit accounts with other financial institutions, and interest earning deposits with the Federal Reserve. These deposits can generally provide the Company with immediate liquidity and generally can be liquidated the same day as is the case with the Federal Reserve within seven days on money market deposit accounts with other financial institutions.
Certificates of Deposit in Other Financial Institutions	Certificates of Deposit in Other Financial Institutions The Company’s investments in certificates of deposit issued by other financial institutions are generally fully insured by the FDIC up to the applicable limit of $250 thousand and have an original maturity of up to 12 months. The current remaining maturities of the Company’s certificates of deposit in other financial institutions at December 31, 2016 range from 4 days to 12 months with a weighted average maturity of 6.2 months and a weighted average yield of 0.97%. At December 31, 2016 and 2015, the Company had $2.7 million of certificates of deposits pledged as collateral for its interest rate swap agreements with one counterparty bank.
Concentrations and Credit Risk in Other Financial Institutions	Concentrations and Credit Risk in Other Financial Institutions The Company maintains certain deposits in other financial institutions in amounts that exceed federal deposit insurance coverage. At December 31, 2016, the amount of deposits in other financial institutions that the Company did not maintain with either the Federal Reserve Bank or the Federal Home Loan Bank and were not covered by FDIC insurance was $38 million in non-interest bearing accounts, $70 million in interest bearing accounts, and $2.7 million in certificates of deposit in other financial institutions. Based on management’s evaluation of the credit risk of maintaining balances and transactions with these correspondent financial institutions, management does not believe that the Company is exposed to any significant credit risk on these balances.
Investment Securities	Investment Securities The Company currently classifies its investment securities under the available-for-sale and held-to-maturity classifications. Under the available-for-sale classification, securities can be sold in response to certain conditions, such as changes in interest rates, changes in the credit quality of the securities, when the credit quality of a security does not conform with current investment policy guidelines, fluctuations in deposit levels or loan demand or a need to restructure the portfolio to better match the maturity or interest rate characteristics of liabilities with assets. Securities classified as available-for-sale are accounted for at their current fair value rather than amortized cost. Unrealized gains or losses are excluded from net income and reported as a separate component of accumulated other comprehensive income (loss) included in shareholders’ equity. If the Company has the intent and the ability at the time of purchase to hold certain securities until maturity, they are classified as held-to-maturity and are stated at amortized cost. As of each reporting date, the Company evaluates the securities portfolio to determine if there has been an other-than-temporary impairment (“OTTI”) on each of the individual securities in the investment securities portfolio. If it is probable that the Company will be unable to collect all amounts due according to the contractual terms of a debt security not impaired at acquisition, an OTTI shall be considered to have occurred. Once an OTTI is considered to have occurred, the credit portion of the loss is required to be recognized in current earnings, while the non-credit portion of the loss is recorded as a separate component of shareholders’ equity. In estimating whether an other-than-temporary impairment loss has occurred, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, (iii) the current liquidity and volatility of the market for each of the individual security categories, (iv) the current slope and shape of the Treasury yield curve, along with where the economy is in the current interest rate cycle, (v) the spread differential between the current spread and the long-term average spread for that security category, (vi) the projected cash flows from the specific security type, (vii) any financial guarantee and financial condition of the guarantor and (viii) the intent and ability of the Company to retain its investment in the issue for a period of time sufficient to allow for any anticipated recovery in fair value. If it’s determined that an OTTI exists on a debt security, the Company then determines if (a) it intends to sell the security or (b) it is more likely than not that it will be required to sell the security before its anticipated recovery. If either of the conditions is met, the Company will recognize the amount of the OTTI in earnings equal to the difference between the security’s fair value and its adjusted cost basis. If neither of the conditions is met, the Company determines (a) the amount of the impairment related to credit loss and (b) the amount of the impairment due to all other factors. The difference between the present value of the cash flows expected to be collected and the amortized cost basis is the credit loss. The credit loss is the portion of the other-than-temporary impairment that is recognized in earnings and is a reduction to the cost basis of the security. The portion of total impairment related to all other factors is included in other comprehensive income. Significant judgment is required in this analysis that includes, but is not limited to assumptions regarding the collectability of principal and interest, future default rates, future prepayment speeds, the amount of current delinquencies that will result in defaults and the amount of eventual recoveries expected on the underlying collateral. Realized gains and losses on sales of securities are recognized in earnings at the time of sale and are determined on a specific-identification basis. Purchase premiums and discounts are recognized in interest income using the interest method over the expected maturity term of the securities. For mortgage-backed securities, the amortization or accretion is based on estimated average lives of the securities. The lives of these securities can fluctuate based on the amount of prepayments received on the underlying collateral of the securities. The amount of prepayments varies from time to time based on the interest rate environment and the rate of turnover of mortgages. The Company’s investment in the common stock of Pacific Coast Bankers Bank (“PCBB”) and The Independent Banker’s Bank (“TIB”) is carried at cost, evaluated for impairment and is included in other assets on the accompanying consolidated balance sheets.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock As a member of the Federal Home Loan Bank of San Francisco (“FHLB”), the Bank is required to maintain an investment in capital stock of the FHLB. The stock does not have a readily determinable fair value and as such is carried at cost and evaluated for impairment. The stock’s value is determined by the ultimate recoverability of the par value rather than by recognizing temporary declines. The determination of whether the par value will ultimately be recovered is influenced by criteria such as the following: (a) the significance of the changes in (increases or declines) in the net assets of the FHLB as compared to the capital stock amount and the length of time these changes (situation) has persisted, (b) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance, (c) the impact of legislative and regulatory changes on the customer base of the FHLB and (d) the liquidity position of the FHLB. The Company’s investment in FHLB stock is included in other assets on the accompanying consolidated balance sheets.
Loans and Interest and Fees on Loans	Loans and Interest and Fees on Loans The Company extends commercial, Small Business Administration, commercial real estate, construction and personal loans to business principals and entrepreneurs, to small and medium-sized businesses, to non-profit organizations, to the professional community, including attorneys, certified public accountants, financial advisors, healthcare providers, and to investors. Loans that the Company has the ability and intent to hold until maturity are stated at the their outstanding unpaid principal balances net of charge offs, net of deferred loan fees and costs on originated loans, net of unearned discounts and unamortized premiums on acquired loans, and further reduced by the valuation allowance for loan losses. Nonrefundable loan fees and direct costs associated with the origination of loans are deferred and recognized in interest income over the loan term using the level yield method. Further, discounts or premiums on acquired loans are accreted or amortized to interest income using the level yield method. Interest on loans is accrued daily and credited to income based on the principal amount outstanding. Interest is calculated using the terms of the loan according to the contractual note agreements. A small number of commercial real estate loans have been identified and designated as hedged items by the Company. For a detailed discussion of the accounting related to the loans designated as hedged items, see Note 1 – Summary of Significant Accounting Policies under “Derivative Financial Instruments and Hedging Activity” and Note 14 – Derivative Financial Instruments. Nonaccrual loans: When a loan is placed on nonaccrual status or has been charged-off, all interest income that has been accrued but not yet collected is reversed against interest income. Subsequent payments received from the customer are applied to principal and no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required. Impaired loans: Troubled debt restructurings Troubled debt restructurings are considered impaired loans and are evaluated for impairment, with the appropriate allowance for loan loss. In determining whether a debtor is experiencing financial difficulties, the Company considers if the debtor is in payment default or would be in payment default in the foreseeable future without the modification, the debtor declared or is in the process of declaring bankruptcy, there is substantial doubt that the debtor will continue as a going concern, the debtor’s entity-specific projected cash flows will not be sufficient to service its debt, or the debtor cannot obtain funds from sources other than the existing creditors at a market rate for debt with similar risk characteristics. In determining whether the Company would grant a concession, the Company assesses, if it does not expect to collect all amounts due, whether the current value of the collateral will satisfy the amounts owed, whether additional collateral or guarantees from the debtor will serve as adequate compensation for other terms of the restructuring, and whether the debtor otherwise has access to funds at a market rate for debt with similar risk characteristics. Typical concessions include reductions to the stated interest rate, payment extensions, principal forgiveness and other actions. A loan that is modified at a market rate of interest will not be classified as a troubled debt restructuring in the calendar year subsequent to the restructuring if it is in compliance with the modified terms and the expectation exists for continued performance going forward. Payment performance prior and subsequent to the restructuring is taken into account in assessing whether it is likely that the borrower can meet the new terms. This may result in the loan being returned to accrual at the time of restructuring, however the Company generally requires a period of sustained repayment for at least six months for return to accrual status. Purchased Credit Impaired Loans:
Loans Held for Sale and Servicing Assets	Loans Held for Sale and Servicing Assets Loans held for sale are loans originated by the Company and include the principal amount outstanding net of unearned income and the loans are carried at the lower of cost or fair value on an aggregate basis. A decline in the aggregate fair value of the loans below their aggregate carrying amount is recognized through a charge to earnings in the period of such decline. Unearned income on these loans is taken into earnings when they are sold. At December 31, 2016 and 2015, the Company had no loans classified as held for sale. Gains or losses resulting from sales of loans are recognized at the date of settlement and are based on the difference between the cash received and the carrying value of the related loans less transaction costs. A transfer of financial assets in which control is surrendered is accounted for as a sale to the extent that consideration other than beneficial interests in the transferred assets is received in the exchange. Assets, liabilities, derivative financial instruments, or other retained interests issued or obtained through the sale of financial assets are measured at estimated fair value, if practicable. The most common retained interest related to loan sales is a servicing asset. Servicing assets are amortized in proportion to and over the period of the estimated future net servicing income. The amortization of the servicing asset and the servicing income are included in non-interest income. The fair value of the servicing assets is estimated by discounting the future cash flows using market-based discount rates and prepayment speeds. The Company’s servicing asset is evaluated regularly for impairment. The servicing asset is stratified based on the original term to maturity and the year of origination of the underlying loans for purposes of measuring impairment. If the fair value of the servicing asset is less than the amortized carrying value, the asset is considered to be impaired and an impairment charge will be taken against earnings. The servicing asset is included in other assets on the consolidated balance sheets.
Allowance for Loan Loss	Allowance for Loan Loss The allowance for loan loss (“Allowance”) is established by a provision for loan losses that is charged against income, increased by charges to expense and decreased by charge-offs (net of recoveries). Loan charge-offs are charged against the Allowance when management believes the collectability of loan principal becomes unlikely. Subsequent recoveries, if any, are credited to the Allowance. The Allowance is an amount that management believes will be adequate to absorb estimated charge-offs related to specifically identified loans, as well as probable loan charge-offs inherent in the balance of the loan portfolio, based on an evaluation of the collectability of existing loans and prior loss experience. Management carefully monitors changing economic conditions, the concentrations of loan categories and collateral, the financial condition of the borrowers, the history of the loan portfolio, as well as historical peer group loan loss data to determine the adequacy of the Allowance. The Allowance is based upon estimates, and actual charge-offs may vary from the estimates. No assurance can be given that adverse future economic conditions will not lead to delinquent loans, increases in the provision for loan losses and/or charge-offs. These evaluations are inherently subjective, as they require estimates that are susceptible to significant revisions as conditions change. In addition, regulatory agencies, as an integral part of their examination process, may require additions to the Allowance based on their judgment about information available at the time of their examinations. Management believes that the Allowance as of December 31, 2016 is adequate to absorb known and probable losses inherent in the loan portfolio. The Allowance consists of specific and general components. The specific component relates to loans that are categorized as impaired. For loans that are categorized as impaired, a specific allowance is established when the realizable value of the impaired loan is lower than the recorded investment of that loan. The general component covers non-impaired loans and is based on the type of loan and historical charge-off experience adjusted for qualitative factors. While the general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative factors as discussed in Note 6 — Loans, the change in the Allowance from one reporting period to the next may not directly correlate to the rate of change of nonperforming loans for the following reasons: • A loan moving from the impaired performing status to an impaired non-performing status does not mandate an automatic increase in allowance. The individual loan is evaluated for a specific allowance requirement when the loan moves to the impaired status, not when the loan moves to non-performing status. In addition, the impaired loan is reevaluated at each subsequent reporting period. Impairment is measured based on the present value of the expected future cash flows discounted at the loan’s effective interest rate, except that as a practical expedient, the Company may measure impairment based on the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. • Not all impaired loans require a specific allowance. The payment performance of the borrower may require an impaired classification, but the collateral evaluation may support adequate collateral coverage. For a number of impaired loans in which borrower performance is in question, the collateral coverage may be sufficient. In those instances, neither a general allowance nor a specific allowance is assessed.
Premises and Equipment	Premises and Equipment Premises and equipment are carried at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives, which range from three to seven years for furniture and fixtures. Leasehold improvements are amortized using the straight-line method over the estimated useful lives of the improvements or the remaining lease term, whichever is shorter. Expenditures for improvements or major repairs are capitalized and those for ordinary repairs and maintenance are charged to operations as incurred.
Other Real Estate Owned ("OREO")	Other Real Estate Owned (“OREO”) Real estate properties that are acquired through, or in lieu of, loan foreclosure are initially recorded at fair value, less estimated costs to sell, at the date of foreclosure, establishing a new cost basis. After foreclosure, valuations are periodically performed by management and the real estate is carried at the lower of the cost basis or fair value less estimated costs to sell. Gains and losses on the sale of OREOs and operating expenses of such assets are included in non-interest expense, and operating revenue of such assets is included in non-interest income.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill resulting from business combinations is generally determined as the excess of the fair value of the consideration transferred over the fair value of the identifiable net assets acquired and liabilities assumed as of the acquisition date. Goodwill and intangible assets acquired in a purchase business combination determined to have an indefinite useful life are not amortized, but tested for impairment at least annually, or more frequently if events and circumstances exist that indicate that an impairment test should be performed. The Company has selected October 1 st as the date to perform its annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives. Goodwill is the only intangible asset with an indefinite life on the Company’s consolidated balance sheets. There was no impairment as of December 31, 2016 or 2015. Core deposit intangible assets arising from business combinations are amortized using an accelerated method over their estimated useful lives and are classified under core deposit and leasehold right intangibles on the Company’s consolidated balance sheets. Leasehold right intangibles is the present value of the excess of market rate lease payments over the contractual lease payments of an acquired lease. The leasehold intangible asset is amortized to expense over the life of the lease and is classified under core deposit and leasehold right intangibles on the accompanying consolidated balance sheets.
Qualified Affordable Housing Project Investments	Qualified Affordable Housing Project Investments The Company has made investments in qualified affordable housing projects that are defined within the industry and here as investments in Low Income Housing Tax Credits (“LIHTC”). The investment in LIHTC provides the Company with tax credits and tax benefits which are designed to encourage investments in the construction and rehabilitation of low-income housing. The Company’s investments are made to limited partnerships that manage or invest in qualified affordable housing projects primarily to receive both tax credits and benefits in addition to CRA credits. The Company must meet certain conditions that a reporting entity must meet to be eligible to use a method other than the equity or cost method to account for qualified affordable housing project investments. If the conditions are met, the Company is permitted to amortize the initial cost of the investment in proportion to the amount of the tax credits and tax benefits received and recognize the net investment performance in the income statement as a component of income tax expense (benefit). The four conditions that must be met to utilize the proportional amortization method are: (a) it is probable that the tax credits allocable to the investor will be available, (b) the investor does not have the ability to exercise significant influence over the operating and financial policies of the limited partnership, and substantially all of the projected benefits are from tax credits and tax benefits, (c) the investor’s projected yield based solely on the cash flows from the tax credits and tax benefits is positive and (d) the investor is a limited partnership investor in the limited liability entity for both legal and tax purposes, and the investor is limited to its capital investment. The Company believes that all the above conditions are met to qualify for proportional amortization. In addition, the Company is required to evaluate its investments in LIHTC for impairment, when there are events or changes in circumstances indicating it is more likely than not that the carrying amount of the Company’s investment would not be realized either through the receipt of tax credits and tax benefits or through a sale. Management does not believe there is any impairment of its LIHTC investments at December 31, 2016. See Note 11 – Investments in Qualified Affordable Housing Projects for details on the Company’s investments in LIHTC’s.
Transfers of Financial Assets	Transfers of Financial Assets Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Derivative Financial Instruments and Hedging Activities	Derivative Financial Instruments and Hedging Activities All derivative instruments (interest rate swap contracts) are recognized on the consolidated balance sheet at their current fair value. Every derivative instrument (including certain derivative instruments embedded in other contracts) is required to be recorded in the balance sheet as either an asset or liability measured at its fair value. ASC Topic 815 requires that changes in the derivative’s fair value be recognized currently in earnings unless specific hedge accounting criteria are met. Accounting for qualifying hedges allows a derivative’s gains and losses to offset related results on the hedged item in the income statement, and requires that a company must formally document, designate and assess the effectiveness of transactions that receive hedge accounting. On the date a derivative contract is entered into by the Company, the Company will designate the derivative contract as either a fair value hedge (i.e. a hedge of the fair value of a recognized asset or liability), a cash flow hedge (i.e. a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability), or a stand-alone derivative (i.e. and instrument with no hedging designation). For a derivative designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in other comprehensive income and are recognized in the income statement when the hedged item affects earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings, as other non-interest income. At inception and on an ongoing basis, the derivatives that are used in hedging transactions are assessed for effectiveness as to how effective they are in offsetting changes in fair values or cash flows of hedged items. The Company will discontinue hedge accounting prospectively when it is determined that the derivative is no longer effective in offsetting change in the fair value of the hedged item, the derivative expires or is sold, is terminated, or management determines that designation of the derivative as a hedging instrument is no longer appropriate. When hedge accounting is discontinued, the Company will continue to carry the derivative on the balance sheet at its fair value (if applicable), but will no longer adjust the hedged asset or liability for changes in fair value. The adjustments of the carrying amount of the hedged asset or liability will be accounted for in the same manner as other components of the carrying amount of that asset or liability, and the adjustments are amortized to interest income over the remaining life of the hedged item upon the termination of hedge accounting.
Income Taxes	Income Taxes The Company provides for current federal and state income taxes payable and for deferred taxes that result from differences between financial accounting rules and tax laws governing the timing of recognition of various income and expense items. The Company recognizes deferred income tax assets and liabilities for the future tax effects of such temporary differences based on the difference between the financial statement and tax bases of the existing assets and liabilities using the statutory rate expected in the years in which the differences are expected to reverse. The effect on deferred taxes of any enacted change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is established to the extent necessary to reduce the deferred tax asset to the level at which it is “more likely than not” that the tax assets or benefits will be realized. Realization of tax benefits for deductible temporary differences and loss carryforwards depends on having sufficient taxable income of an appropriate character within the carryback and carryforward period and that current tax law will allow for the realization of those tax benefits. The Company is required to account for uncertainty associated with the tax positions it has taken or expects to be taken on past, current and future tax returns. Where there may be a degree of uncertainty as to the tax realization of an item, the Company may only record the tax effects (expense or benefits) from an uncertain tax position in the consolidated financial statements if, based on its merits, the position is more likely than not to be sustained on audit by the taxing authorities. The Company does not believe that it has any material uncertain tax positions taken to date that are not more likely than not to be realized. Interest and penalties related to uncertain tax positions are recorded as part of other operating expense.
Earnings per Share ("EPS")	Earnings per Share (“EPS”) Basic earnings per common share is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted EPS includes the dilutive effect of potential common stock using the treasury stock method only if the effect on earnings per share is dilutive. See Note 4 – Computation of Earnings per Common Share.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Standards Adopted in 2016 In March 2016, the FASB issued ASU 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting Recent Accounting Standards Not Yet Effective In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), Under current U.S. GAAP, when full consideration is not expected and financing is required by the buyer to purchase the property, there are very prescriptive requirements in determining when foreclosed real estate property sold by an institution should be derecognized and a gain or loss be recognized. The new guidance that will be applied to these sales is more principles based. For example, as it pertains to the criteria for determining how a contract should be accounted for under the new guidance, judgment will need to be exercised in evaluating if: (a) a commitment on the buyer’s part exists, (b) collection is probable in circumstances where the initial investment is minimal and (c) the buyer has obtained control of the asset, including the significant risks and rewards of the ownership. If there is no commitment on the buyer’s part, collection is not probable or the buyer has not obtained control of the asset, then a gain cannot be recognized under the new guidance. The initial investment requirement for the buyer along with the various methods for profit recognition are no longer applicable when the new guidance goes into effect. The Company will revise its current policy on the recognition and measurement of gain on sale of other real estate owned to be consistent with the new guidance, but does not expect the new guidance to have a significant impact on the consolidated financial statements of the Company when adopted. Since the inception of the Company, the level of other real estate owned has been very low and in almost all cases, full consideration was received at the time of sale and financing by the Company was not provided. For deposit-related fees, considering the straightforward nature of the arrangements with the Company’s deposits customers, the Company does not expect the recognition and measurement outcomes of deposit-related fees to be significant differently under the new guidance compared to current U.S. GAAP. ASU 2014-09 was to be effective for interim and annual periods beginning after December 15, 2016 and was to be applied on either a modified retrospective or full retrospective basis. In August 2015, the FASB issued ASU 2015-14 which defers the original effective date for all entities by one year. Public business entities should apply the guidance in ASU 2015-14 to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company does not expect this ASU to have a material impact on the Company’s consolidated financial statements when adopted on January 1, 2018. In January 2016, the FASB issued ASU 2016-01, Financial Instruments–Overall: Recognition and Measurement of Financial Assets and Financial Liabilities The Company does not have any equity securities in its available-for-sale portfolio, but only investments in the common stock of PCBB, TIB, and the FHLB, the Company’s correspondent banks. Under the current accounting policy, the Company’s investments in these common stock are carried at cost because a readily determinable fair value does not exist for these investments. Under ASU 2016-01, investment in FHLB is specifically excluded from the requirement that equity securities are to be measured at fair value with unrealized holding gains and losses reflected in net income. Furthermore, the ASU allows entities to make an irrevocable practicality exception whereby entities can make an election, on a security-by-security basis, to account for equity securities that do not have readily determinable fair value at cost, with adjustments to fair value when an observable price change occurs or impairment is identified. As such, the Company intends to continue to measure its investments in PCBB, TIB and FHLB common stock at cost upon adoption on January 1, 2018. The Company does not expect this ASU to have a material impact on the Company’s consolidated financial statements when adopted. In February 2016, the FASB issued ASU 2016-02, Leases As of December 31, 2016, the Company has 10 operating leases for 10 locations under contract with a term greater than 12 months with future lease payments totaling $11 million. At adoption date, January 1, 2019, the Company will recognize a lease liability for the present value of future lease commitments and a right of use asset. The recognized right of use asset relating to operating leases will consist of the present value of future lease commitments, unamortized initial direct costs, prepaid rent, and the related unamortized balance of lease incentives. The discount rate used to present value future lease payments will be the Company’s incremental borrowing rate at the time of adoption. The Company will take a modified retrospective transition approach with application in all comparative periods presented. The Company does not expect this ASU to have a material impact on the Company’s consolidated financial statements when adopted. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326) In August 2016, the FASB issued ASU 2016-15, Statement of Cash flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments • Debt prepayment of debt extinguishment costs • Settlement of zero-coupon bonds • Contingent consideration payments made after a business combination • Proceeds from the settlement of insurance claims • Proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies • Distributions received from equity method investees • Beneficial interests in securitization transactions • Separately identifiable cash flows and application of the predominance principle ASU 2016-15 is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The Company is currently evaluating the impact of this ASU on its consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash flows (Topic 230): Restricted Cash In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of Business In January 2017, the FASB issued ASU 2017-04, Intangibles–Goodwill and Other {Topic 350): Simplifying the Test for Goodwill Impairment ,

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2016
1st Enterprise Bank
Schedule of Pro Forma Information	The following table presents (unaudited) pro forma information for the period indicated as though the 1 st Enterprise merger had been completed as of January 1, 2013. The 2014 pro forma net income excludes historical non-recurring merger expenses net of taxes, totaling approximately $3.2 million for the Company and 1 st Enterprise (dollars in thousands, except per share data). Proforma Year ended Net interest income after provision for loan losses $ 77,140 Net income $ 17,218 Preferred stock dividends and discount accretion (1,234 ) Net income available to common shareholders $ 15,984 Diluted earnings per share $ 0.94

Computation of Book Value and39

Computation of Book Value and Tangible Book Value per Common Share (Tables)	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Computation of Book Value and Tangible Book Value per Common Share	The tables below present the computation of book value and tangible book value per common share as of the dates indicated (dollars in thousands, except share and per share data): December 31, 2016 2015 Total Shareholders’ Equity $ 338,185 $ 306,807 Less: Preferred stock 16,955 16,995 Less: Goodwill 64,603 64,603 Less: Core deposit and leasehold right intangibles 6,300 7,671 Tangible Shareholders’ Equity $ 250,327 $ 217,538 Common shares issued and outstanding 17,759,006 17,175,389 Book value per common share $ 18.09 $ 16.87 Tangible book value per common share $ 14.10 $ 12.67

Computation of Earnings per C40

Computation of Earnings per Common Share (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Common Share Computations	The following table shows weighted average basic common shares outstanding, potential dilutive shares related to stock options, unvested restricted stock, and weighted average diluted shares for the periods indicated (dollars in thousands, except share and per share data): Years Ended 2016 2015 2014 Net Income $ 27,457 $ 21,236 $ 8,908 Less: Preferred stock dividends and discount accretion 1,217 1,174 124 Net Income available to common shareholders $ 26,240 $ 20,062 $ 8,784 Weighted average basic common shares outstanding 17,252,046 16,543,787 11,393,445 Dilutive effect of potential common share issuances from stock options and restricted stock 298,819 439,434 274,288 Weighted average diluted common shares outstanding 17,550,865 16,983,221 11,667,733 Income per common share Basic $ 1.52 $ 1.21 $ 0.77 Diluted $ 1.50 $ 1.18 $ 0.75 Anti-dilutive shares not included in the calculation of diluted earnings per share 1,189 32,811 79,000

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Gross Unrealized Gains and Losses, and Fair Values of Investment Securities	The following tables present the amortized cost, gross unrealized gains and losses, and fair values of investment securities by major category as of the dates indicated (dollars in thousands): Gross Unrealized December 31, 2016 Amortized Cost Gains Losses Fair Value Available-for-sale investment securities: U.S. Govt Agency and Sponsored Agency – Note Securities $ 10,000 $ — $ 31 $ 9,969 U.S. Govt Agency – SBA Securities 123,224 365 739 122,850 U.S. Govt Agency – GNMA Mortgage-Backed Securities 22,565 70 265 22,370 U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities 243,159 92 4,351 238,900 Asset Backed Securities 7,111 — 215 6,896 U.S. Treasury Notes 69,101 7 143 68,965 Total available-for-sale 475,160 534 5,744 469,950 Held-to-maturity investment securities: Municipal Securities 42,027 69 159 41,937 Total held-to-maturity 42,027 69 159 41,937 Total investment securities $ 517,187 $ 603 $ 5,903 $ 511,887 Gross Unrealized December 31, 2015 Amortized Cost Gains Losses Fair Value Available-for-sale investment securities: U.S. Govt Agency and Sponsored Agency – Note Securities $ 1,014 $ — $ — $ 1,014 U.S. Govt Agency – SBA Securities 93,674 399 583 93,490 U.S. Govt Agency – GNMA Mortgage-Backed Securities 30,916 202 418 30,700 U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities 97,693 250 789 97,154 Corporate Securities 4,016 7 — 4,023 Municipal Securities 1,010 1 — 1,011 Asset Backed Securities 7,890 — 243 7,647 U.S. Treasury Notes 80,981 — 235 80,746 Total available-for-sale 317,194 859 2,268 315,785 Held-to-maturity investment securities: Municipal Securities 42,036 335 32 42,339 Total held-to-maturity 42,036 335 32 42,339 Total investment securities $ 359,230 $ 1,194 $ 2,300 $ 358,124
Gross Unrealized Losses and Fair Values of AFS and HTM Investment Securities that were in Unrealized Loss Positions	The following tables present the gross unrealized losses and fair values of AFS and HTM investment securities that were in unrealized loss positions, summarized and classified according to the duration of the loss period as of the dates indicated (dollars in thousands). < 12 Continuous Months > 12 Continuous Total December 31, 2016 Fair Value Gross Fair Gross Fair Value Gross Available-for-sale investment securities: U.S. Govt. Agency – SBA Securities $ 54,302 $ 451 $ 39,322 $ 288 $ 93,624 $ 739 U.S. Govt. Agency – GNMA Mortgage-Backed Securities 6,652 98 8,264 167 14,916 265 U.S. Govt. Agency 9,969 31 — 9,969 31 U.S. Govt. Sponsored Agency CMO & Mortgage-Backed Securities 215,138 4,172 10,879 179 226,017 4,351 Asset Backed Securities — — 6,896 215 6,896 215 U.S. Treasury Notes 51,972 143 — — 51,972 143 Total available-for-sale $ 338,033 $ 4,895 $ 65,361 $ 849 $ 403,394 $ 5,744 Held-to-maturity investment securities: Municipal Securities $ 28,673 $ 158 $ 310 $ 1 $ 28,983 $ 159 Total held-to-maturity $ 28,673 $ 158 $ 310 $ 1 $ 28,983 $ 159 < 12 Continuous Months > 12 Continuous Total December 31, 2015 Fair Value Gross Fair Gross Fair Value Gross Available-for-sale investment securities: U.S. Govt. Agency SBA Securities $ 53,852 $ 428 $ 7,935 $ 154 $ 61,787 $ 582 U.S. Govt. Agency – GNMA Mortgage-Backed Securities 5,417 47 14,296 371 19,713 418 U.S. Govt. Sponsored Agency – CMO & Mortgage-Backed Securities 67,475 564 10,024 225 77,499 789 Asset Backed Securities 2,928 54 4,719 190 7,647 244 U.S Treasury Notes 80,745 235 — — 80,745 235 Total available-for-sale $ 210,417 $ 1,328 $ 36,974 $ 940 $ 247,391 $ 2,268 Held-to-maturity investment securities: Municipal Securities $ 5,669 $ 16 $ 2,392 $ 16 $ 8,061 $ 32 Total held-to-maturity $ 5,669 $ 16 $ 2,392 $ 16 $ 8,061 $ 32
Maturities Schedule of Securities	December 31, 2016 Maturities Schedule of Securities (Dollars in thousands) Amortized Fair Value Weighted Available-for-sale investment securities: Due through one year $ 126,167 $ 125,375 1.13 % Due after one year through five years 194,066 191,915 1.52 % Due after five years through ten years 117,858 116,127 1.89 % Due after ten years 37,069 36,533 2.21 % Total available-for-sale 475,160 469,950 1.56 % Held-to-maturity investment securities: Due through one year 3,711 3,711 1.42 % Due after one year through five years 35,336 35,254 1.63 % Due after five years through ten years 2,980 2,972 2.71 % Total held-to-maturity 42,027 41,937 1.69 % Total investment securities $ 517,187 $ 511,887 1.57 %
Composition of Interest Income on Investment Securities	The following table presents the composition of interest income on investment securities for the periods indicated (dollars in thousands): Years ended December 31, 2016 2015 2014 Taxable interest $ 5,141 $ 3,773 $ 2,331 Non-taxable interest 652 745 38 Total interest income on investment securities $ 5,793 $ 4,518 $ 2,369

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Composition of Loan Portfolio	The following table presents the composition of the loan portfolio as of the dates indicated (dollars in thousands): December 31, 2016 Principal Net Unaccreted Net Deferred Fees Total Commercial and Industrial Loans: $ 505,374 $ (2,737 ) $ 502,637 Loans Secured by Real Estate: Owner-Occupied Nonresidential Properties 455,120 (3,798 ) 451,322 Other Nonresidential Properties 635,856 (5,693 ) 630,163 Construction, Land Development and Other Land 195,215 (1,156 ) 194,059 1-4 Family Residential Properties 129,261 (2,097 ) 127,164 Multifamily Residential Properties 110,336 (478 ) 109,858 Total Loans Secured by Real Estate 1,525,788 (13,222 ) 1,512,566 Other Loans: 35,246 (223 ) 35,023 Total Loans $ 2,066,408 $ (16,182 ) $ 2,050,226 December 31, 2015 Principal Net Unaccreted Net Deferred Fees Total Commercial and Industrial Loans: $ 543,192 $ (5,824 ) $ 537,368 Loans Secured by Real Estate: Owner-Occupied Nonresidential Properties 412,772 (4,793 ) 407,979 Other Nonresidential Properties 539,260 (6,092 ) 533,168 Construction, Land Development and Other Land 126,626 (794 ) 125,832 1-4 Family Residential Properties 117,400 (2,875 ) 114,525 Multifamily Residential Properties 72,222 (1,043 ) 71,179 Total Loans Secured by Real Estate 1,268,280 (15,597 ) 1,252,683 Other Loans: 43,218 (106 ) 43,112 Total Loans $ 1,854,690 $ (21,527 ) $ 1,833,163
Summary of Activity for Allowance for Loan Loss	The following is a summary of activity for the allowance for loan loss for the dates and periods indicated (dollars in thousands): December 31, 2016 2015 2014 Allowance for loan loss at beginning of year $ 15,682 $ 12,610 $ 10,603 Provision for loan losses 3,264 5,080 2,239 Net (charge-offs) recoveries: Charge-offs (895 ) (2,510 ) (692 ) Recoveries 1,323 502 460 Net (charge-offs) recoveries 428 (2,008 ) (232 ) Allowance for loan loss at end of year $ 19,374 $ 15,682 $ 12,610 Net (charge-offs) recoveries to average loans 0.02 % (0.12 )% (0.02 )% Allowance for loan loss to total loans 0.94 % 0.86 % 0.78 % Allowance for loan loss to total loans accounted for at historical cost, which excludes loans and the related allowance for loans acquired through acquisition 1.18 % 1.25 % 1.39 %
Changes in Allowance for Loan Loss	The following tables present, by portfolio segment, the changes in the allowance for loan loss and the recorded investment in loans as of the dates and for the periods indicated (dollars in thousands): Commercial and Industrial Construction, Land Development and Other Land Commercial Other Real Other Total Year ended – December 31, 2016 Allowance for loan loss – Beginning balance $ 5,924 $ 2,076 $ 6,821 $ 861 $ 15,682 Provision for loan losses 783 1,008 1,661 (188 ) 3,264 Net (charge-offs) recoveries: Charge-offs (895 ) — — — (895 ) Recoveries 1,318 — 5 — 1,323 Total net recoveries 423 — 5 — 428 Ending balance $ 7,130 $ 3,084 $ 8,487 $ 673 $ 19,374 Commercial and Industrial Construction, Land Development and Other Land Commercial Other Real Other Total Year ended – December 31, 2015 Allowance for loan loss – Beginning balance $ 5,864 $ 1,684 $ 4,802 $ 260 $ 12,610 Provision for loan losses 1,781 392 2,306 601 5,080 Net (charge-offs) recoveries: Charge-offs (2,218 ) — (292 ) — (2,510 ) Recoveries 497 — 5 — 502 Total net (charge-offs) (1,721 ) — (287 ) — (2,008 ) Ending balance $ 5,924 $ 2,076 $ 6,821 $ 861 $ 15,682
Allowance for Loan Loss and Associated Loan Balance Classified by Loan Portfolio Segment and by Credit Evaluation Methodology	The following tables present both the allowance for loan loss and the associated loan balance classified by loan portfolio segment and by credit evaluation methodology (dollars in thousands): Commercial and Industrial Construction, Land and Other Land Commercial Other Real Other Total December 31, 2016 Allowance for loan loss: Individually evaluated for impairment $ — $ — $ — $ — $ — Collectively evaluated for impairment 7,130 3,084 8,487 673 19,374 Purchased credit impaired (loans acquired with deteriorated credit quality) — — — — — Total Allowance for Loan Loss $ 7,130 $ 3,084 $ 8,487 $ 673 $ 19,374 Loans receivable: Individually evaluated for impairment $ 378 $ — $ 245 $ — $ 623 Collectively evaluated for impairment 501,960 194,059 1,316,849 35,023 2,047,891 Purchased credit impaired (loans acquired with deteriorated credit quality) 299 — 1,413 — 1,712 Total Loans Receivable $ 502,637 $ 194,059 $ 1,318,507 $ 35,023 $ 2,050,226 Commercial and Industrial Construction, Land and Other Land Commercial Other Real Other Total December 31, 2015 Allowance for loan loss: Individually evaluated for impairment $ — $ — $ — $ — $ — Collectively evaluated for impairment 5,924 2,076 6,821 861 15,682 Purchased credit impaired (loans acquired with deteriorated credit quality) — — — — — Total Allowance for Loan Loss $ 5,924 $ 2,076 $ 6,821 $ 861 $ 15,682 Loans receivable: Individually evaluated for impairment $ 558 $ — $ 649 $ — $ 1,207 Collectively evaluated for impairment 536,333 125,832 1,124,667 43,112 1,829,944 Purchased credit impaired (loans acquired with deteriorated credit quality) 477 — 1,535 — 2,012 Total Loans Receivable $ 537,368 $ 125,832 $ 1,126,851 $ 43,112 $ 1,833,163
Risk Category of Loans by Class of Loans	The following tables present the risk category of loans by class of loans based on the most recent internal loan classification as of the dates indicated (dollars in thousands): December 31, 2016 Commercial Construction, Commercial Other Real Other Total Pass $ 456,885 $ 194,059 $ 1,288,154 $ 32,128 $ 1,971,226 Special Mention 12,774 — 7,557 — 20,331 Substandard 32,978 — 22,796 2,895 58,669 Doubtful — — — — — Total $ 502,637 $ 194,059 $ 1,318,507 $ 35,023 $ 2,050,226 December 31, 2015 Commercial Construction, Commercial Other Real Other Total Pass $ 503,006 $ 125,832 $ 1,101,548 $ 40,132 $ 1,770,518 Special Mention 16,041 — 6,494 43 22,578 Substandard 18,321 — 18,809 2,937 40,067 Doubtful — — — — — Total $ 537,368 $ 125,832 $ 1,126,851 $ 43,112 $ 1,833,163
Age Analysis of Recorded Investment	The following tables present an aging analysis of the recorded investment in past due and non-accrual loans as of the dates indicated (dollars in thousands): December 31, 2016 31-60 Days Past Due 61-90 Days Past Due Greater 90 Days Past Due and Total Past Due and Total Non- Current Total Loans Commercial and Industrial $ — $ — $ — $ — $ 675 $ 501,962 $ 502,637 Construction, Land Development and Other Land — — — — — 194,059 194,059 Commercial and Other Real Estate 212 — — 212 447 1,317,848 1,318,507 Other — — — — — 35,023 35,023 Total $ 212 $ — $ — $ 212 $ 1,122 $ 2,048,892 $ 2,050,226 December 31, 2015 31-60 Days Past Due 61-90 Days Past Due Greater 90 Days Past Due and Total Past Due and Total Non- Current Total Loans Commercial and Industrial $ — $ — $ — $ — $ 1,032 $ 536,336 $ 537,368 Construction, Land Development and Other Land — — — — — 125,832 125,832 Commercial and Other Real Estate — — — — 1,019 1,125,832 1,126,851 Other — — — — — 43,112 43,112 Total $ — $ — $ — $ — $ 2,051 $ 1,831,112 $ 1,833,163
Recorded Investment and Unpaid Principal Balances for Impaired Loans	The following tables present, by loan portfolio segment, the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount, if applicable for the dates and periods indicated (dollars in thousands). These tables exclude purchased credit impaired loans (loans acquired in acquisitions with deteriorated credit quality) of $1.7 million and $2.0 million at December 31, 2016 and 2015, respectively. Year ended December 31, 2016 Recorded Unpaid Related Average Interest With no specific allowance recorded: Commercial and Industrial $ 378 $ 1,383 $ — $ 401 $ — Commercial and Other Real Estate 245 282 — 252 — With an allowance recorded: Commercial and Industrial — — — — — Commercial and Other Real Estate — — — — — Total Commercial and Industrial 378 1,383 — 401 — Commercial and Other Real Estate 245 282 — 252 — Total $ 623 $ 1,665 $ — $ 653 $ — Year ended December 31, 2015 Recorded Unpaid Related Average Interest With no specific allowance recorded: Commercial and Industrial $ 558 $ 1,027 $ — $ 672 $ — Commercial and Other Real Estate 649 692 — 70 — With an allowance recorded: Commercial and Industrial — — — — — Commercial and Other Real Estate — — — — — Total Commercial and Industrial 558 1,027 — 672 — Commercial and Other Real Estate 649 692 — 70 — Total $ 1,207 $ 1,719 $ — $ 742 $ —
Additional Information on Impaired Loans	The following is a summary of additional information pertaining to impaired loans for the periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 2014 Average recorded investment in impaired loans $ 653 $ 742 $ 4,991 Interest foregone on impaired loans $ 89 $ 265 421 Cash collections applied to reduce principal balance $ 351 $ 1,118 3,014 Interest income recognized on cash collections $ — $ — $ —
Recorded Investment and Unpaid Principal Balances for Troubled Debt Restructured Loans	The following tables include the recorded investment and unpaid principal balances for troubled debt restructured loans at December 31, 2016, December 31, 2015 and December 31, 2014 (dollars in thousands). These tables include TDR loans that were purchased credit impaired (“PCI”). TDR loans that are non-PCI loans are included in Impaired Loans disclosures. As of December 31, 2016, there were two PCI loans that are considered to be TDR loans with a recorded investment of $105 thousand and unpaid principal balances of $273 thousand. Year ended December 31, 2016 Recorded Unpaid Interest Commercial and Industrial $ 408 $ 1,174 $ — Total $ 408 $ 1,174 $ — Year ended December 31, 2015 Recorded Unpaid Interest Commercial and Industrial $ 627 $ 1,363 $ — Total $ 627 $ 1,363 $ — Year ended December 31, 2014 Recorded Unpaid Interest Commercial and Industrial $ 530 $ 719 $ — Commercial and Other Real Estate 114 115 — Total $ 644 $ 834 $ —
Pre and Post Modification Recorded Investment in TDR Loans	The following tables show the pre- and post-modification recorded investment in TDR loans by loan segment that have occurred during the periods indicated (dollars in thousands): Year ended December 31, 2016 Number Pre-Modification Post- Extended Maturity Date and Deferred Principal and Interest Payments: Commercial and Industrial 1 $ 650 $ 73 Total 1 $ 650 $ 73 Year ended December 31, 2015 Number Pre-Modification Post- Reduced Interest Rate and Lengthened Amortization: Commercial and Industrial 3 $ 1,335 $ 208 Total 3 $ 1,335 $ 208 Year ended December 31, 2014 Number Pre-Modification Post- Reduced Interest Rate and Lengthened Amortization: Commercial and Industrial 1 $ 224 $ 224 Commercial and Other Real Estate 1 114 114 Total 2 $ 338 $ 338
Accretable Yield for Acquired Loans	The following table reflects the accretable net discount for loans acquired through acquisition, for the periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 Balance, beginning of year $ 14,610 $ 21,402 Accretion, included in interest income (4,967 ) (6,274 ) Additions, due to acquisition — — Reclassifications to non-accretable yield (32 ) (518 ) Balance, end of year $ 9,611 $ 14,610
Carrying Value of Purchased Credit Impaired Loans	The following table reflects the outstanding balance and related carrying value of PCI loans as of the dates indicated (dollars in thousands): December 31, 2016 December 31, 2015 Unpaid Carrying Unpaid Carrying Commercial and Industrial $ 622 $ 299 $ 2,331 $ 477 Commercial and Other Real Estate 1,997 1,413 2,250 1,535 Other — — 61 — Total $ 2,619 $ 1,712 $ 4,642 $ 2,012
Accretable Net Discount of Purchased Credit Impaired Loans	The following table reflects the activities in the accretable net discount for PCI loans for the period indicated (dollars in thousands): Year Ended Year Ended Balance, beginning of year $ 246 $ 324 Accretion, included in interest income (85 ) (78 ) Reclassifications from non-accretable yield — — Balance, end of year $ 161 $ 246

Premises and Equipment and Le43

Premises and Equipment and Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	The following major classifications of premises and equipment are summarized as follows as of the dates indicated (dollars in thousands): December 31, 2016 2015 Furniture and equipment $ 8,032 $ 8,345 Leasehold improvements 7,382 7,260 Total 15,414 15,605 Less: Accumulated depreciation and amortization (11,230 ) (10,466 ) Total $ 4,184 $ 5,139
Future Minimum Lease Payments for Operating Leases for Office and Branch Space Based Upon Obligations	The following is a schedule of future minimum lease payments for operating leases for office and branch space based upon obligations at December 31, 2016 (dollars in thousands): Year Amount 2017 $ 3,322 2018 2,493 2019 2,345 2020 2,208 2021 1,903 Thereafter 2,215 Total $ 14,486

Goodwill, Core Deposit and Le44

Goodwill, Core Deposit and Leasehold Right Intangibles (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Value of Goodwill	The following table presents changes in the carrying value of goodwill for the periods indicated (dollars in thousands): Year Ended 2016 2015 Balance, beginning of year $ 64,603 $ 63,950 Measurement-period adjustment — 653 Goodwill acquired during the year — — Impairment losses — — Balance, end of year $ 64,603 $ 64,603 Accumulated impairment losses at end of year $ — $ —
Changes in Gross Amounts of Core Deposit Intangibles and Related Accumulated Amortization	The following table presents the changes in the gross amounts of core deposit intangibles and the related accumulated amortization for the dates and periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 2014 Gross amount of CDI: Balance, beginning of year $ 9,246 $ 9,246 $ 2,103 Additions due to acquisitions — — 7,143 Balance, end of year 9,246 9,246 9,246 Accumulated Amortization: Balance, beginning of year (2,736 ) (1,056 ) (665 ) Amortization (1,280 ) (1,680 ) (391 ) Balance, end of year (4,016 ) (2,736 ) (1,056 ) Net CDI, end of year $ 5,230 $ 6,510 $ 8,190

Qualified Affordable Housing 45

Qualified Affordable Housing Project Investments (Tables)	12 Months Ended
	Dec. 31, 2016
Federal Home Loan Banks [Abstract]
Schedule of Company's Original Investment in Affordable Housing Project	The following table presents the Company’s original investment in the LIHTC projects, the current recorded investment balance, and the unfunded liability balance of each investment at December 31, 2016, 2015 and 2014. In addition, the table reflects the tax credits and tax benefits recorded by the Company during 2016, 2015 and 2014, the amortization of the investment and the net impact to the Company’s income tax provision for 2016, 2015 and 2014. The Company’s recorded investment balance in the LIHTC projects and the related unfunded liability balance are included in other assets and other liabilities on the accompanying consolidated balance sheets, respectively. Also see Note 19 – Income Tax, for the impact of these investments on the Company’s effective tax rate (dollars in thousands): Qualified Affordable Housing Projects at Original Current Unfunded Tax Credits Amortization of Investments (2) Net Income Enterprise Green Communities West II LP $ 1,000 $ 513 $ 22 $ 131 $ 90 $ 41 Enterprise Housing Partners Calgreen II Fund LP 2,050 1,214 165 218 212 6 Enterprise Housing Partners XXIV LP 2,000 1,513 391 212 167 45 Total – Investments in Qualified Affordable Housing Projects $ 5,050 $ 3,240 $ 578 $ 561 $ 469 $ 92 Qualified Affordable Housing Projects at Original Current Unfunded Tax Credits Amortization of Investments (2) Net Income Enterprise Green Communities West II LP $ 1,000 $ 604 $ 69 $ 136 $ 92 $ 44 Enterprise Housing Partners Calgreen II Fund LP 2,050 1,426 165 198 164 34 Enterprise Housing Partners XXIV LP 2,000 1,680 806 209 180 29 Total – Investments in Qualified Affordable Housing Projects $ 5,050 $ 3,710 $ 1,040 $ 543 $ 436 $ 107 Qualified Affordable Housing Projects at Original Current Unfunded Tax Credits Amortization of Net Income Enterprise Green Communities West II LP $ 1,000 $ 704 $ 162 $ 127 $ 84 $ 43 Enterprise Housing Partners Calgreen II Fund LP 2,050 1,588 635 229 174 55 Enterprise Housing Partners XXIV LP 2,000 1,849 1,685 160 112 48 Total – Investments in Qualified Affordable Housing Projects $ 5,050 $ 4,141 $ 2,482 $ 516 $ 370 $ 146 (1) The amounts reflected in this column represent both the tax credits, as well as the tax benefits generated by the Qualified Affordable Housing Projects operating loss for the year. (2) This amount reduces the tax credits and benefits generated by the Qualified Affordable Housing Projects
Schedule of Anticipated Income Tax Benefit that is Expected to be Recognized	The following table reflects the anticipated net income tax benefit that is expected to be recognized by the Company over the next five years (dollars in thousands): Qualified Affordable Housing Projects Enterprise Green Enterprise Enterprise Total Net Income Tax Anticipated net income tax benefit less amortization of investments: 2017 $ 43 $ 40 $ 38 $ 121 2018 43 40 37 120 2019 $ 43 $ 40 $ 37 $ 120 2020 40 40 37 117 2021 and thereafter 72 134 169 375 Total – anticipated net income tax benefit in Qualified Affordable Housing Projects $ 241 $ 294 $ 318 $ 853

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Schedule of Maturity of Time Deposits	The following table shows the maturity of the Company’s time deposits of $250 thousand or more at December 31, 2016 (dollars in thousands): Maturity of Time Deposits of $250,000 or More Three months or less $ 12,359 Over three through six months 2,034 Over six through twelve months 4,757 Over twelve months 269 Total $ 19,419

Borrowings and Subordinated D47

Borrowings and Subordinated Debentures (Tables)	12 Months Ended
	Dec. 31, 2016
Brokers and Dealers [Abstract]
Terms and Maturity of Bank's Securities Sold under Agreements	The tables below describe the terms and maturity of the Company’s securities sold under agreements to repurchase as of the dates indicated (dollars in thousands): December 31, 2016 Date Issued Amount Interest Rate Original Maturity Date December 31, 2016 $ 18,816 0.2% – 0.25% 4 days January 4, 2017 Total $ 18,816 0.25% December 31, 2015 Date Issued Amount Interest Rate Original Maturity Date December 31, 2015 $ 14,360 0.08% – 0.25% 4 days January 4, 2016 Total $ 14,360 0.19%
Securities Sold under Agreements to Repurchase	The table below describes additional details regarding the Company’s securities sold under agreements to repurchase for the dates and periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 Balance Average Weighted Balance Average Weighted Securities sold under agreements to repurchase $ 18,816 $ 22,739 0.23 % $ 14,360 $ 13,966 0.22 %
Terms of Issuance Subordinated Debentures Outstanding	The following table summarizes the terms of each issuance of subordinated debentures outstanding as of December 31, 2016 (dollars in thousands): Series Amount Issuance Maturity Rate Index Current Next Reset Trust I $ 6,186 12/10/04 03/15/35 3 month LIBOR+2.05 % 3.01 % 03/15/17 Trust II 3,093 12/23/05 03/15/36 3 month LIBOR+1.75 % 2.71 % 03/15/17 Trust III 3,093 06/30/06 09/15/36 3 month LIBOR+1.85 % 2.81 % 03/15/17 Subtotal 12,372 Unamortized fair value adjustment 2,516 Net $ 9,856 The following table summarizes the terms of each issuance of subordinated debentures outstanding as of December 31, 2015: Series Amount Issuance Maturity Rate Index Current Next Trust I $ 6,186 12/10/04 03/15/35 3 month LIBOR+2.05 % 2.56 % 03/15/16 Trust II 3,093 12/23/05 03/15/36 3 month LIBOR+1.75 % 2.26 % 03/15/16 Trust III 3,093 06/30/06 09/15/36 3 month LIBOR+1.85 % 2.36 % 03/15/16 Subtotal 12,372 Unamortized fair value adjustment 2,675 Net $ 9,697

Derivative Financial Instrume48

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Effect of Derivative Instruments on Consolidated Statements of Income	The following table summarizes the effect of derivative financial instruments on the consolidated statements of income for the periods indicated (dollars in thousands): Year Ended December 31, 2016 2015 2014 Derivatives not designated as hedging instruments: Interest rate swap contracts – loans Increase in fair value of interest rate swap contracts $ 218 $ 206 $ 219 Payments on interest rate swap contracts on loans (240 ) (263 ) (273 ) Net decrease in other non-interest income $ (22 ) $ (57 ) $ (54 ) Derivatives designated as hedging instruments: Interest rate swap contracts – loans Increase in fair value of interest rate swap contracts $ 762 $ 926 $ 927 Increase (decrease) in fair value of hedged loans 41 133 315 Payments on interest rate swap contracts on loans (821 ) (1,089 ) (1,256 ) Net decrease in interest income on loans $ (18 ) $ (30 ) $ (14 )
1st Enterprise Bank
Balance Sheet Classification of Derivative Financial Instruments	The following tables presents the fair values of the asset and liability of the Company’s derivative instruments acquired from 1 st Enterprise as of the dates and periods indicated (dollars in thousands): Asset Derivatives December 31, 2016 December 31, 2015 Interest rate swap contracts fair value $523 $881 Balance sheet location Accrued Interest Accrued Interest The following table presents the fair values of the liability of the Company’s derivative instruments acquired from 1 st Enterprise as of the dates indicated (dollars in thousands): Liability Derivatives December 31, 2016 December 31, 2015 Interest rate swap contracts fair value $523 $881 Balance sheet location Accrued Interest Accrued Interest
PC Bancorp
Balance Sheet Classification of Derivative Financial Instruments	The following table presents the notional amount and the fair values of the asset and liability of the Company’s derivative instruments acquired from PC Bancorp as of the dates indicated (dollars in thousands): Liability Derivatives December 31, 2016 December 31, 2015 Fair Value Hedges Total interest rate contracts notional amount $ 17,642 $ 25,938 Derivatives not designated as hedging instruments: Interest rate swap contracts fair value $ 95 $ 313 Derivatives designated as hedging instruments: Interest rate swap contracts fair value 589 1,351 Total interest rate contracts fair value $ 684 $ 1,664 Balance sheet location Accrued Interest Payable Accrued Interest Payable

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	12 Months Ended
	Dec. 31, 2016
Text Block [Abstract]
Securities Sold under Repurchase Agreements and Derivatives Securities Offset in Consolidated Financial Statements Due to an Enforceable Master Netting Arrangement	The table below presents the Company’s financial instruments that may be eligible for offsetting which include securities sold under agreements to repurchase that have no enforceable master netting arrangement and derivative securities that could be offset in the consolidated financial statements due to an enforceable master netting arrangement (dollars in thousands): Gross Gross Net Amounts in the Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Collateral December 31, 2016 Financial Assets: Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments) $ 523 $ — $ 523 $ 523 $ — $ — Total $ 523 $ — $ 523 $ 523 $ — $ — Financial Liabilities: Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments) $ 1,207 $ — $ 1,207 $ 1,207 $ 4,555 $ 3,348 Securities sold under agreements to repurchase 18,816 — 18,816 18,816 48,204 29,388 Total $ 20,023 $ — $ 20,023 $ 20,023 $ 52,759 $ 32,736 Gross Gross Net in the Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Collateral December 31, 2015 Financial Assets: Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments) $ 881 $ — $ 881 $ 881 $ — $ — Total $ 881 $ — $ 881 $ 881 $ — $ — Financial Liabilities: Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments) $ 2,545 $ — $ 2,545 $ 2,545 $ 4,759 $ 2,214 Securities sold under agreements to repurchase 14,360 — 14,360 14,360 46,596 32,236 Total $ 16,905 $ — $ 16,905 $ 16,905 $ 51,355 $ 34,450

Stock Options and Restricted 50

Stock Options and Restricted Stock (Tables)	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Future Compensation Expense Related to Unvested Restricted Stock Grants	At December 31, 2016, future compensation expense related to unvested restricted stock grants aggregated to the amounts reflected in the table below (dollars in thousands): Future Stock Based Compensation Expense Restricted Stock 2017 $ 2,081 2018 762 2019 220 2020 43 Thereafter — Total $ 3,106
Share Option Activity	The following table summarizes the stock option activity under the plans for the year ended December 31, 2016: Shares Weighted Weighted (in years) Aggregate (in Outstanding stock options at December 31, 2015 557,471 $ 10.57 0.8 $ 8,248 Granted — Exercised (505,274 ) Forfeited — Expired (4,500 ) Outstanding stock options at December 31, 2016 47,697 $ 12.69 1.43 $ 1,102 Exercisable options at December 31, 2016 47,697 $ 12.69 1.43 $ 1,102 Unvested options at December 31, 2016 —
Restricted Stock Activity	The following table summarizes the restricted stock activity under the Equity Plan for the year ended December 31, 2016 (dollars in thousands): Number Weighted-Average Restricted Stock: Unvested, at December 31, 2015 311,458 $ 19.29 Granted 142,309 23.80 Vested (160,310 ) 18.93 Cancelled and forfeited (11,375 ) 20.88 Unvested, at December 31, 2016 282,082 $ 21.98
Summary of Excess Tax Benefits Recognized by Award Type	The following table presents excess tax benefits recognized, by award type (dollars in thousands): Year Ended December 31, 2016 Number of Awards Related Excess Tax Stock Options 505,274 $ 914 Restricted Stock 160,310 523 Total 665,584 $ 1,437

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Tax Expense	Income tax expense consists of the following (dollars in thousands): Year Ended December 31, 2016 2015 2014 Current provision Federal $ 10,921 $ 9,265 $ 4,517 State 3,653 2,923 1,183 Total current provision 14,574 12,188 5,700 Deferred provision Federal 923 291 382 State 456 389 350 Total deferred provision 1,379 680 732 Total current and deferred provision $ 15,953 $ 12,868 $ 6,432
Components of Net Deferred Tax Assets Recognized in Consolidated Balance Sheet	The following is a summary of the components of the net deferred tax assets recognized in the consolidated balance sheets as of the dates indicated (dollars in thousands): December 31, 2016 2015 Deferred Tax Assets Federal tax operating loss carryforward $ 60 $ 64 State tax operating loss carryforward 165 170 Allowance for loan loss 9,293 7,473 Purchase accounting and loan fair value adjustments 3,820 7,024 Accruals and other liabilities 929 958 Stock compensation and deferred compensation costs 4,618 5,732 Net unrealized loss on securities available-for-sale 2,190 593 Start up, organizational and other costs 244 332 Total deferred tax assets 21,319 22,346 Deferred Tax Liabilities State tax liability (64 ) (441 ) Unamortized fair value on subordinated debentures (1,153 ) (1,230 ) Core deposit intangibles (2,397 ) (2,984 ) Prepaid expense and other (518 ) (652 ) Total deferred tax liabilities (4,132 ) (5,307 ) Valuation allowance (6 ) (6 ) Deferred tax assets, net $ 17,181 $ 17,033
Reconciliation of Statutory Income Tax Rate	The following table presents a reconciliation of the statutory income tax rate to the consolidated effective income tax rate for each of the periods indicated (dollars in thousands): For Years Ended December 31, 2016 2015 2014 Amount Percent Amount Percent Amount Percent Federal income tax expense at statutory rate $ 15,193 35.00 % $ 11,937 35.00 % $ 5,369 35.00 % State franchise taxes, net of federal benefit, excluding LIHTC investments 2,743 6.32 2,236 6.55 1,209 7.88 Release of state valuation allowance on use of net operating loss — — (29 ) (0.09 ) (68 ) (0.44 ) Meals and entertainment, dues and other non-deductible items 142 0.33 132 0.39 75 0.49 Cash surrender life insurance (456 ) (1.05 ) (453 ) (1.33 ) (231 ) (1.51 ) Stock compensation expense (68 ) (0.16 ) (100 ) (0.29 ) (53 ) (0.35 ) Excess tax benefit from stock transactions (1,196 ) (2.75 ) — — — — LIHTC investments (111 ) (0.25 ) (141 ) (0.41 ) (119 ) (0.77 ) Merger costs — — — — 515 3.36 Tax Exempt Income (290 ) (0.67 ) (314 ) (0.92 ) — — Other (4 ) (0.01 ) (400 ) (1.17 ) (265 ) (1.73 ) $ 15,953 36.76 % $ 12,868 37.73 % $ 6,432 41.93 %

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss)	The following table presents the changes in accumulated other comprehensive income (loss) by component for the periods indicated (dollars in thousands): For the Year Ended December 31, 2016 2015 2014 Statement of Beginning balance, net of tax $ (816 ) $ 190 $ (205 ) Net unrealized gain (loss) arising during the period (3,543 ) (1,624 ) 628 Related tax effect 1,490 683 (260 ) Reclassification of (gain) loss on investment securities available-for-sale to net income (258 ) (112 ) 47 Gain on sale of Related tax effect 108 47 (20 ) Provision for Other Comprehensive Income (Loss) (2,203 ) (1,006 ) 395 Ending balance $ (3,019 ) $ (816 ) $ 190

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The following tables present the regulatory capital ratios requirements and the actual capitalization levels of the Company and the Bank as of the dates indicated (dollars in thousands): CU Bancorp December 31, December 31, Well Basel III Amount Amount (greater than or equal to) Regulatory Capital Ratios: Tier 1 leverage ratio 9.72 % 9.67 % 5.0 % NA Common Equity Tier 1 ratio 9.61 % 9.61 % 6.5 % 5.125 % Total Tier 1 risk-based capital ratio 10.68 % 10.85 % 8.0 % 6.625 % Total risk-based capital ratio 11.44 % 11.54 % 10.0 % 8.625 % Regulatory Capital Data: Common Equity Tier 1 $ 257,105 $ 223,977 Total Tier 1 capital 285,843 252,681 Total risk-based capital 306,103 268,971 Average total assets* 2,940,790 2,611,774 Risk-weighted assets 2,675,987 2,329,770 California United Bank: December 31, December 31, Well Capitalized Basel III Amount Amount (greater than or equal to) Regulatory Capital Ratios: Tier 1 leverage ratio 9.35 % 9.34 % 5.0 % NA % Common Equity Tier 1 ratio 10.28 % 10.47 % 6.5 % 5.125 % Total Tier 1 risk-based capital ratio 10.28 % 10.47 % 8.0 % 6.625 % Total risk-based capital ratio 11.04 % 11.17 % 10.0 % 8.625 % Regulatory Capital Data: Common Equity Tier 1 $ 275,151 $ 243,989 Tier 1 capital 275,151 243,989 Total risk-based capital 295,411 260,279 Average total assets * 2,941,253 2,612,206 Risk-weighted assets 2,677,030 2,329,798 * Represents the average total assets for the leverage ratio

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis	The following table presents the financial assets and financial liabilities measured at fair value on a recurring basis as of the dates indicated, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands): Fair Value Quoted Prices Significant Significant Financial Assets – December 31, 2016 Investment securities available-for-sale: U.S. Govt Agency and Sponsored Agency – Note Securities $ 9,969 $ — $ 9,969 — U.S. Govt Agency – SBA Securities 122,850 — 122,850 — U.S. Govt Agency – GNMA Mortgage-Backed Securities 22,370 — 22,370 — U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities 238,900 — 238,900 — Asset Backed Securities 6,896 — 6,896 — U.S. Treasury Notes 68,965 68,965 — — Interest Rate Swap Contracts 523 — 523 — $ 470,473 68,965 401,508 — Financial Liabilities – December 31, 2016 Interest Rate Swap Contracts $ 1,207 $ — $ 1,207 $ — Financial Assets – December 31, 2015 Investment securities available-for-sale: U.S. Govt Agency and Sponsored Agency –Note Securities $ 1,014 $ — $ 1,014 — U.S. Govt Agency – SBA Securities 93,490 — 93,490 — U.S. Govt Agency – GNMA Mortgage-Backed Securities 30,700 — 30,700 — U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities 97,154 — 97,154 — Corporate Securities 4,023 — 4,023 — Municipal Securities 1,011 — 1,011 — Asset Backed Securities 7,647 — 7,647 — U.S. Treasury Notes 80,746 80,746 — — Interest Rate Swap Contracts 881 — 881 — $ 316,666 80,746 235,920 — Financial Liabilities – December 31, 2015 Interest Rate Swap Contracts $ 2,545 $ — $ 2,545 $ —
Balances of Assets Measured at Fair Value on Non-Recurring Basis	The following table presents the balances of assets measured at fair value on a non-recurring basis by level within the fair value hierarchy as of the dates indicated (dollars in thousands): Net Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) Financial Assets – December 31, 2016 Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans) $ 73 $ — $ — $ 73 SBA Servicing Asset 940 — — 940 Total $ 1,013 $ — $ — $ 1,013 Net Quoted Prices (Level 1) Significant (Level 2) Significant (Level 3) Financial Assets – December 31, 2015 Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans) $ — $ — $ — $ — SBA Servicing Asset 1,147 — — 1,147 Other real estate owned 325 — — 325 Total $ 1,472 $ — $ — $ 1,472
Losses Related to Nonrecurring Fair Value Measurements	The following table presents losses related to nonrecurring fair value measurements. The losses related to assets held on the balance sheet at each respective period end (dollars in thousands): For the Year Ended December 31, 2016 2015 2014 Financial Assets Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans) $ 508 $ — $ 222 SBA Servicing Asset — — — Other real estate owned — 133 — Total $ 508 $ 133 $ 222
Significant Unobservable Inputs Used in Fair Value Measurements for Level 3 Assets Measured at Fair Value on Recurring or Non-Recurring Basis	The following table presents the significant unobservable inputs used in the fair value measurements for Level 3 assets measured at fair value on a non-recurring basis as of the dates indicated (dollars in thousands): Fair Value Valuation Methodology Unobservable Unobservable Financial Assets – December 31, 2016 Collateral dependent impaired loans with specific valuation allowance and/or partial charge-off $ 73 Credit loss Credit loss factors 20% Discount Rates 13% SBA Servicing Asset 940 Discounted Cash Estimated Average 39 months Total $ 1,013 Financial Assets – December 31, 2015 Discount Rates 12% SBA Servicing Asset 1,147 Discounted Cash Estimated Average 61 months Other real estate owned 325 Broker opinion of Sales approach Estimated selling 6% Total $ 1,472 — —
Level in Fair Value Hierarchy for Financial Instruments Estimated Fair Values	The table below presents the carrying amounts and fair values of certain financial instruments based on their fair value hierarchy indicated (dollars in thousands): Fair Value Measurements Carrying Estimated Quoted Significant Significant December 31, 2016 Financial Assets Cash and due from banks $ 41,281 $ 41,281 $ 41,281 $ — $ — Interest earning deposits in other financial institutions 167,789 167,789 167,789 — — Investment securities held-to-maturity 42,027 41,937 — 41,937 — Loans, net 2,030,852 2,054,701 — — 2,054,701 Bank owned life insurance 51,216 51,216 — — 51,216 FHLB Stock 9,182 9,182 — — 9,182 Financial Liabilities Certificates of deposit 29,480 29,480 — 29,480 — Securities sold under agreements to repurchase 18,816 18,816 — 18,816 — Subordinated debentures 9,856 12,372 — 12,372 — December 31, 2015 Financial Assets Cash and due from banks $ 50,960 $ 50,960 $ 50,960 $ — $ — Interest earning deposits in other financial institutions 171,103 171,103 171,103 — — Investment securities held-to-maturity 42,036 42,339 — 42,339 — Loans, net 1,817,481 1,851,220 — — 1,851,220 Bank owned life insurance 49,912 49,912 — — 49,912 FHLB Stock 8,014 8,014 — — 8,014 Financial Liabilities — Certificates of deposit 58,502 58,502 — 58,502 — Securities sold under agreements to repurchase 14,360 14,360 — 14,360 — Subordinated debentures 9,697 12,372 — 12,372 —

Summary Quarterly Data (unaud55

Summary Quarterly Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Summary Quarterly Financial Data	2016 Quarters Ended 2015 Quarters Ended (Dollars in thousands, except per share data) Dec. Sept. June Mar. Dec. Sept. June Mar. Interest income $ 26,151 $ 25,855 $ 24,997 $ 24,249 $ 23,807 $ 23,106 $ 21,941 $ 21,288 Interest expense 820 807 748 771 705 704 668 646 Net interest income 25,331 25,048 24,249 23,478 23,102 22,402 21,273 20,642 Provision for loan losses 882 697 1,063 622 2,249 705 683 1,443 Net interest income after provision for loan losses 24,449 24,351 23,186 22,856 20,853 21,697 20,590 19,199 Non-interest income 3,159 3,058 2,975 2,820 3,039 2,988 3,095 2,608 Non-interest expense 16,401 16,767 15,089 15,187 15,073 15,067 14,912 14,913 Net income before provision for income tax expense 11,207 10,642 11,072 10,489 8,819 9,618 8,773 6,894 Provision for income tax expense 4,037 4,059 3,952 3,905 3,312 3,355 3,506 2,695 Net Income $ 7,170 $ 6,583 $ 7,120 $ 6,584 $ 5,507 $ 6,263 $ 5,267 $ 4,199 Preferred stock dividends and discount accretion or premium amortization $ 303 $ 304 $ 307 $ 303 $ 297 $ 293 $ 312 $ 272 Net Income Available to Common Shareholders $ 6,867 $ 6,279 $ 6,813 $ 6,281 $ 5,210 $ 5,970 $ 4,955 $ 3,927 Basic income per share $ 0.39 $ 0.36 $ 0.40 $ 0.37 $ 0.31 $ 0.36 $ 0.30 $ 0.24 Diluted income per share $ 0.39 $ 0.36 $ 0.39 $ 0.36 $ 0.30 $ 0.35 $ 0.29 $ 0.23

Condensed Financial Informati56

Condensed Financial Information of Parent Company (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Condensed Balance Sheet	The following tables present the parent company only condensed balance sheets and the related statements of income and condensed statements of cash flows for the dates and periods indicated (dollars in thousands): Parent Company Only Condensed Balance Sheets December 31, 2016 2015 ASSETS Cash and due from banks $ 9,715 $ 6,756 Loans 148 882 Investment in subsidiary 339,683 310,263 Accrued interest receivable and other assets 463 4 Total Assets $ 350,009 $ 317,905 LIABILITIES Subordinated debentures $ 9,856 $ 9,697 Accrued interest payable and other liabilities 1,968 1,401 Total Liabilities 11,824 11,098 SHAREHOLDERS’ EQUITY 338,185 306,807 Total Liabilities and Shareholders’ Equity $ 350,009 $ 317,905
Parent Company Condensed Income Statement	Parent Company Only Condensed Statements of Income Years Ended 2016 2015 Interest Income $ 59 $ 71 Interest Expense 487 438 Operating Expenses 649 676 Total Expenses 1,136 1,114 Loss Before Income Tax Benefit and Equity in Undistributed Earnings of Subsidiary (1,077 ) (1,043 ) Income tax benefit 478 466 Loss Before Equity in Undistributed Earnings of Subsidiary (599 ) (577 ) Equity in undistributed earnings of subsidiary 28,056 21,813 Net Income $ 27,457 $ 21,236
Parent Company Condensed Cash Flow Statement	Parent Company Only Condensed Statements of Cash Flows Years Ended 2016 2015 Cash flows from operating activities: Net income: $ 27,457 $ 21,236 Adjustments to reconcile net income to net cash used in operating activities: Equity in undistributed earnings of subsidiary (28,056 ) (21,813 ) Net accretion of discounts/premiums (10 ) (19 ) Accretion of subordinated debenture discount 159 159 Increase in accrued interest receivable and other assets (536 ) (27 ) Increase (decrease) in accrued interest payable and other liabilities 644 (84 ) Net cash used in operating activities (342 ) (548 ) Cash flows from investing activities: Capital contribution made to subsidiary — (1,000 ) Net decrease in loans 744 547 Net cash (used in) provided by investing activities 744 (453 ) Cash flows from financing activities: Net proceeds from exercise of stock options 5,185 4,299 Restricted stock repurchase (1,371 ) (971 ) Dividends paid on preferred stock (1,257 ) (183 ) Net cash provided by financing activities 2,557 3,145 Net increase in cash 2,959 2,144 Cash, beginning of year 6,756 4,612 Cash, end of year $ 9,715 $ 6,756 Supplemental disclosures of cash flow information: Cash paid during the period for interest $ 328 $ 277

Summary of Significant Accoun57

Summary of Significant Accounting Policies - Additional Information (Detail)	Feb. 25, 2016	Dec. 31, 2016USD ($)LeasesOfficeLocation	Dec. 31, 2016USD ($)LeasesOfficeLocation	Dec. 31, 2015USD ($)
Summary Of Significant Accounting Policies [Line Items]
Full service branch offices | Office		9	9
Federal Reserve Bank Balance		$ 16,000,000	$ 16,000,000	$ 14,000,000
Deposits not covered by FDIC insurance		38,000,000	38,000,000
Interest bearing deposit		70,000,000	70,000,000
Certificates of Deposits		2,700,000	2,700,000
Loans held for sale		0	0	0
Goodwill, impairment		0	0	0
Operating lease future payments		$ 14,486,000	$ 14,486,000
ASU 2016-02, Leases
Summary Of Significant Accounting Policies [Line Items]
Number of operating leases | Leases		10	10
Operating leases by location | Location		10	10
Operating leases term of contract			12 months
Operating lease future payments		$ 11,000,000	$ 11,000,000
Certificates of Deposit
Summary Of Significant Accounting Policies [Line Items]
Certificates of deposit, weighted average maturity period			6 months 6 days
Certificates of deposit, weighted average yield		0.97%	0.97%
Interest rate swap contracts fair value
Summary Of Significant Accounting Policies [Line Items]
Amount pledged as collateral		$ 4,500,000	$ 4,500,000
Interest rate swap contracts fair value | Certificates of Deposits Pledged as Collateral
Summary Of Significant Accounting Policies [Line Items]
Amount pledged as collateral		2,700,000	$ 2,700,000	$ 2,700,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Certificates of deposit remaining maturity period			4 days
Minimum | Furniture and Fixtures
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life			3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Certificates of deposit original maturity period			12 months
Certificates of deposit remaining maturity period			12 months
Certificates of deposit in other financial institutions		$ 250,000	$ 250,000
Short tem lease, Term of contract	12 months
Maximum | Furniture and Fixtures
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life			7 years

Business Combinations - Additio

Business Combinations - Additional Information (Detail) - 1st Enterprise Bank - USD ($) $ / shares in Units, $ in Millions	Nov. 30, 2014	Dec. 31, 2016
Business Acquisition [Line Items]
Merger date	Jun. 2, 2014
Effective date of acquisition		Nov. 30, 2014
Share received in exchange for each share	1.3450
Common stock issued	5,200,000
Fair value of common stock issued as part of consideration paid	$ 103
Market price of common stock	$ 19.60
Number of Non-Cumulative Perpetual Preferred Stock, Series D converted to Non-Cumulative Perpetual Preferred Stock, Series A	16,400
Estimated non-recurring merger expenses for legal, accounting, and other professional fees, net of tax		$ 3.2

Schedule of Pro Forma Informati

Schedule of Pro Forma Information (Detail) - 1st Enterprise Bank $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)$ / shares
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net interest income after provision for loan losses	$ 77,140
Net income	17,218
Preferred stock dividends and discount accretion	(1,234)
Net income available to common shareholders	$ 15,984
Diluted earnings per share | $ / shares	$ 0.94

Computation of Book Value and60

Computation of Book Value and Tangible Book Value per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Total Shareholders' Equity	$ 338,185	$ 306,807	$ 279,192	$ 137,924
Less: Preferred stock	16,955	16,995
Less: Goodwill	64,603	64,603	$ 63,950
Less: Core deposit and leasehold right intangibles	6,300	7,671
Tangible Shareholders' Equity	$ 250,327	$ 217,538
Common shares issued	17,759,006	17,175,389
Common shares outstanding	17,759,006	17,175,389
Book value per common share	$ 18.09	$ 16.87
Tangible book value per common share	$ 14.10	$ 12.67

Basic and Diluted Earnings Per

Basic and Diluted Earnings Per Common Share Computations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Income	$ 7,170	$ 6,583	$ 7,120	$ 6,584	$ 5,507	$ 6,263	$ 5,267	$ 4,199	$ 27,457	$ 21,236	$ 8,908
Less: Preferred stock dividends and discount accretion	303	304	307	303	297	293	312	272	1,217	1,174	124
Net Income available to common shareholders	$ 6,867	$ 6,279	$ 6,813	$ 6,281	$ 5,210	$ 5,970	$ 4,955	$ 3,927	$ 26,240	$ 20,062	$ 8,784
Weighted average basic common shares outstanding									17,252,046	16,543,787	11,393,445
Dilutive effect of potential common share issuances from stock options and restricted stock									298,819	439,434	274,288
Weighted average diluted common shares outstanding									17,550,865	16,983,221	11,667,733
Basic income (loss) per share	$ 0.39	$ 0.36	$ 0.40	$ 0.37	$ 0.31	$ 0.36	$ 0.30	$ 0.24	$ 1.52	$ 1.21	$ 0.77
Diluted income (loss) per share	$ 0.39	$ 0.36	$ 0.39	$ 0.36	$ 0.30	$ 0.35	$ 0.29	$ 0.23	$ 1.50	$ 1.18	$ 0.75
Anti-dilutive shares not included in the calculation of diluted earnings per share									1,189	32,811	79,000

Amortized Cost, Gross Unrealize

Amortized Cost, Gross Unrealized Gains and Losses, and Fair Values of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost	$ 475,160	$ 317,194
Available-for-sale Investment Securities, Gross Unrealized Gains	534	859
Available-for-sale Investment Securities, Gross Unrealized Losses	5,744	2,268
Fair Value	469,950	315,785
Held-to-maturity Investment Securities, Amortized Cost	42,027	42,036
Held-to-maturity Investment Securities, Gross Unrealized Gain	69	335
Held-to-maturity Investment Securities, Gross Unrealized Losses	159	32
Fair Value	41,937	42,339
Available-for-sale Investment Securities and Held-to-maturity Investment Securities, Amortized Cost	517,187	359,230
Available-for-sale Investment Securities and Held-to-maturity Investment Securities, Gross Unrealized Gain	603	1,194
Available-for-sale Investment Securities and Held-to-maturity Investment Securities, Gross Unrealized Losses	5,903	2,300
Available-for-sale Investment Securities and Held-to-maturity Investment Securities, Fair Value	511,887	358,124
U.S. Govt Agency and Sponsored Agency - Note Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost	10,000	1,014
Available-for-sale Investment Securities, Gross Unrealized Losses	31
Fair Value	9,969	1,014
U.S. Govt Agency - SBA Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost	123,224	93,674
Available-for-sale Investment Securities, Gross Unrealized Gains	365	399
Available-for-sale Investment Securities, Gross Unrealized Losses	739	583
Fair Value	122,850	93,490
U.S. Govt Agency - GNMA Mortgage-Backed Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost	22,565	30,916
Available-for-sale Investment Securities, Gross Unrealized Gains	70	202
Available-for-sale Investment Securities, Gross Unrealized Losses	265	418
Fair Value	22,370	30,700
U.S. Govt Sponsored Agency - CMO & Mortgage-Backed Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost	243,159	97,693
Available-for-sale Investment Securities, Gross Unrealized Gains	92	250
Available-for-sale Investment Securities, Gross Unrealized Losses	4,351	789
Fair Value	238,900	97,154
Corporate Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost		4,016
Available-for-sale Investment Securities, Gross Unrealized Gains		7
Fair Value		4,023
Municipal Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost		1,010
Available-for-sale Investment Securities, Gross Unrealized Gains		1
Fair Value		1,011
Held-to-maturity Investment Securities, Amortized Cost	42,027	42,036
Held-to-maturity Investment Securities, Gross Unrealized Gain	69	335
Held-to-maturity Investment Securities, Gross Unrealized Losses	159	32
Fair Value	41,937	42,339
Asset Backed Securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost	7,111	7,890
Available-for-sale Investment Securities, Gross Unrealized Losses	215	243
Fair Value	6,896	7,647
U. S. Treasury Notes
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-sale Investment Securities, Amortized Cost	69,101	80,981
Available-for-sale Investment Securities, Gross Unrealized Gains	7
Available-for-sale Investment Securities, Gross Unrealized Losses	143	235
Fair Value	$ 68,965	$ 80,746

Investment Securities - Additio

Investment Securities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other-than-temporary impairment losses	$ 0	$ 0
Gain (loss) on sale of investment securities, net	258,000	112,000	$ (47,000)
Net proceeds from sale of investment securities	6,919,000	5,737,000	25,156,000
Company's investment in the common stock of the FHLB	9,100,000	8,000,000
Securities sold under agreements to repurchase
Schedule of Trading Securities and Other Trading Assets [Line Items]
Market value of securities pledged to secure securities sold under agreements to repurchase	205,000,000	197,000,000
Accrued Interest Receivable and Other Assets | Federal Home Loan Bank of San Francisco
Schedule of Trading Securities and Other Trading Assets [Line Items]
FHLB stock impairment losses	0
Other Non-Interest Income | Federal Home Loan Bank of San Francisco
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cash dividends received	$ 1,100,000	$ 1,100,000	$ 320,000

Gross Unrealized Losses and Fai

Gross Unrealized Losses and Fair Values of AFS and HTM Investment Securities that were in Unrealized Loss Positions (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	$ 338,033	$ 210,417
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Gross Unrealized Loss	4,895	1,328
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	65,361	36,974
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Gross Unrealized Loss	849	940
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	403,394	247,391
Temporarily-impaired available-for-sale investment securities, Total, Gross Unrealized Loss	5,744	2,268
Temporarily-impaired held-to-maturity investment securities, Less than 12 months, Fair Value	28,673	5,669
Temporarily-impaired held-to-maturity investment securities, Less than 12 months, Gross Unrealized Loss	158	16
Temporarily-impaired held-to-maturity investment securities, More than 12 months, Fair Value	310	2,392
Temporarily-impaired held-to-maturity investment securities, More than 12 months, Gross Unrealized Loss	1	16
Temporarily-impaired held-to-maturity investment securities, Fair Value	28,983	8,061
Temporarily-impaired held-to-maturity investment securities, Gross Unrealized Loss	159	32
Municipal Securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Temporarily-impaired held-to-maturity investment securities, Less than 12 months, Fair Value	28,673	5,669
Temporarily-impaired held-to-maturity investment securities, Less than 12 months, Gross Unrealized Loss	158	16
Temporarily-impaired held-to-maturity investment securities, More than 12 months, Fair Value	310	2,392
Temporarily-impaired held-to-maturity investment securities, More than 12 months, Gross Unrealized Loss	1	16
Temporarily-impaired held-to-maturity investment securities, Fair Value	28,983	8,061
Temporarily-impaired held-to-maturity investment securities, Gross Unrealized Loss	159	32
U.S. Govt Agency - SBA Securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	54,302	53,852
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Gross Unrealized Loss	451	428
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	39,322	7,935
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Gross Unrealized Loss	288	154
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	93,624	61,787
Temporarily-impaired available-for-sale investment securities, Total, Gross Unrealized Loss	739	582
U.S. Govt Agency - GNMA Mortgage-Backed Securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	6,652	5,417
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Gross Unrealized Loss	98	47
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	8,264	14,296
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Gross Unrealized Loss	167	371
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	14,916	19,713
Temporarily-impaired available-for-sale investment securities, Total, Gross Unrealized Loss	265	418
U.S. Govt Sponsored Agency - CMO & Mortgage-Backed Securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	215,138	67,475
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Gross Unrealized Loss	4,172	564
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	10,879	10,024
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Gross Unrealized Loss	179	225
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	226,017	77,499
Temporarily-impaired available-for-sale investment securities, Total, Gross Unrealized Loss	4,351	789
Asset Backed Securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value		2,928
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Gross Unrealized Loss		54
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	6,896	4,719
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Gross Unrealized Loss	215	190
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	6,896	7,647
Temporarily-impaired available-for-sale investment securities, Total, Gross Unrealized Loss	215	244
U. S. Treasury Notes
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	51,972	80,745
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Gross Unrealized Loss	143	235
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	51,972	80,745
Temporarily-impaired available-for-sale investment securities, Total, Gross Unrealized Loss	143	$ 235
U.S. Govt. Agency
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	9,969
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Gross Unrealized Loss	31
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	9,969
Temporarily-impaired available-for-sale investment securities, Total, Gross Unrealized Loss	$ 31

Maturities Schedule of Securiti

Maturities Schedule of Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale investment securities, Amortized Cost
Due through one year	$ 126,167
Due after one year through five years	194,066
Due after five years through ten years	117,858
Due after ten years	37,069
Available-for-sale Investment Securities, Amortized Cost	475,160	$ 317,194
Held-to-maturity investment securities, Amortized Cost
Due through one year	3,711
Due after one year through five years	35,336
Due after five years through ten years	2,980
Held-to-maturity Investment Securities, Amortized Cost	42,027	42,036
Available-for-sale Investment Securities and Held-to-maturity Investment Securities, Amortized Cost	517,187	359,230
Available-for-sale investment securities, Fair Value
Due through one year	125,375
Due after one year through five years	191,915
Due after five years through ten years	116,127
Due after ten years	36,533
Total available-for-sale	469,950	315,785
Held-to-maturity investment securities, Fair Value
Due through one year	3,711
Due after one year through five years	35,254
Due after five years through ten years	2,972
Total held-to-maturity	41,937	42,339
Total investment securities	$ 511,887	$ 358,124
Available-for-sale investment securities, Weighted Average Yield
Due through one year	1.13%
Due after one year through five years	1.52%
Due after five years through ten years	1.89%
Due after ten years	2.21%
Total available-for-sale	1.56%
Held-to-maturity investment securities, Weighted Average Yield
Due through one year	1.42%
Due after one year through five years	1.63%
Due after five years through ten years	2.71%
Total held-to-maturity	1.69%
Total investment securities	1.57%

Composition of Interest Income

Composition of Interest Income on Investment Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income, Securities, Operating, by Taxable Status [Abstract]
Taxable interest	$ 5,141	$ 3,773	$ 2,331
Non-taxable interest	652	745	38
Total interest income on investment securities	$ 5,793	$ 4,518	$ 2,369

Composition of Loan Portfolio (

Composition of Loan Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	$ 2,066,408	$ 1,854,690
Net Unaccreted Discounts, Net Deferred Fees	(16,182)	(21,527)
Total loans	2,050,226	1,833,163
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	505,374	543,192
Net Unaccreted Discounts, Net Deferred Fees	(2,737)	(5,824)
Total loans	502,637	537,368
Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,318,507	1,126,851
Construction, Land Development and Other Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	194,059	125,832
Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	35,246	43,218
Net Unaccreted Discounts, Net Deferred Fees	(223)	(106)
Total loans	35,023	43,112
Loans Secured by Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	1,525,788	1,268,280
Net Unaccreted Discounts, Net Deferred Fees	(13,222)	(15,597)
Total loans	1,512,566	1,252,683
Loans Secured by Real Estate | Construction, Land Development and Other Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	195,215	126,626
Net Unaccreted Discounts, Net Deferred Fees	(1,156)	(794)
Total loans	194,059	125,832
Owner-Occupied Nonresidential Properties | Loans Secured by Real Estate | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	455,120	412,772
Net Unaccreted Discounts, Net Deferred Fees	(3,798)	(4,793)
Total loans	451,322	407,979
Other Nonresidential Properties | Loans Secured by Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net Unaccreted Discounts, Net Deferred Fees	(5,693)	(6,092)
Other Nonresidential Properties | Loans Secured by Real Estate | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	635,856	539,260
Total loans	630,163	533,168
1-4 Family Residential Properties | Loans Secured by Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net Unaccreted Discounts, Net Deferred Fees	(2,097)	(2,875)
1-4 Family Residential Properties | Loans Secured by Real Estate | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	129,261	117,400
Total loans	127,164	114,525
Multifamily Residential Properties | Loans Secured by Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net Unaccreted Discounts, Net Deferred Fees	(478)	(1,043)
Multifamily Residential Properties | Loans Secured by Real Estate | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	110,336	72,222
Total loans	$ 109,858	$ 71,179

Loans - Additional Information

Loans - Additional Information (Detail)	Dec. 31, 2016USD ($)	Dec. 31, 2016USD ($)Loan	Dec. 31, 2015USD ($)Loan	Dec. 31, 2014USD ($)Loan	Dec. 31, 2013USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Impaired Loans	$ 1,122,000	$ 1,122,000	$ 2,051,000
Credit impaired notes	2,048,892,000	2,048,892,000	1,831,112,000
Credit purchase impaired loan	623,000	623,000	1,207,000
Recorded Investment	408,000	408,000	627,000	$ 644,000
Unpaid Principal Balance		$ 1,174,000	$ 1,363,000	$ 834,000
Number of Loans | Loan		1	3	2
Commitment to lend borrowers	0	$ 0	$ 0
Payment defaults subsequent to modification on troubled debt restructured loans		0
Allowance for credit losses	19,374,000	19,374,000	15,682,000	$ 12,610,000	$ 10,603,000
SBA Servicing Asset
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balances sold	19,000,000	19,000,000
Loans, net	14,000,000	14,000,000
Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Impaired Loans	447,000	447,000	1,019,000
Credit impaired notes	1,317,848,000	1,317,848,000	1,125,832,000
Credit purchase impaired loan	245,000	245,000	649,000
Recorded Investment				114,000
Unpaid Principal Balance				115,000
Allowance for credit losses	8,487,000	8,487,000	6,821,000	$ 4,802,000
Debt Instrument Remaining Loans | SBA Servicing Asset
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	4,800,000	4,800,000
Debt Instrument Un-guaranteed Loans | SBA Servicing Asset
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	4,700,000	4,700,000
Debt Instrument Guaranteed Loans | SBA Servicing Asset
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 123,000	123,000
Owner-Occupied Nonresidential Properties | Credit Concentration Risk | Loans Secured by Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan concentration percentage	30.00%
Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balances sold	$ 75,000,000	75,000,000
Small Business Administration [Member] | PC Bancorp
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced	104,000,000	104,000,000
Small Business Administration [Member] | Debt Instrument Remaining Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	29,000,000	29,000,000
Small Business Administration [Member] | Debt Instrument Un-guaranteed Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	24,000,000	24,000,000
Small Business Administration [Member] | Debt Instrument Guaranteed Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	5,000,000	5,000,000
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Impaired Loans	499,000	499,000	844,000
Credit impaired notes	1,200,000	1,200,000	1,200,000
Credit purchase impaired loan	1,712,000	1,712,000	2,012,000
Recorded Investment	105,000	105,000
Unpaid Principal Balance		$ 273,000
Number of Loans | Loan		2
Allowance for credit losses	0	$ 0	0
PCI Loans | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit purchase impaired loan	$ 1,413,000	$ 1,413,000	$ 1,535,000
Loans Secured by Real Estate | Credit Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan concentration percentage	74.00%
Loans Secured by Real Estate First Trust Deed Lien | Credit Concentration Risk | Loans Secured by Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan concentration percentage	96.00%
Loans Secured by Real Estate First Trust Deed Lien | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan to value ratio	75.00%	75.00%
Loans Secured by Real Estate Second Trust Deed Lien | Credit Concentration Risk | Loans Secured by Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan concentration percentage	4.00%
UCC Filing | Credit Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan concentration percentage	20.00%
Uncollateralized | Credit Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan concentration percentage	5.00%

Summary of Activity for Allowan

Summary of Activity for Allowance for Loan Loss (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Allowance for loan loss at beginning of period				$ 15,682				$ 12,610	$ 15,682	$ 12,610	$ 10,603
Provision for loan losses	$ 882	$ 697	$ 1,063	$ 622	$ 2,249	$ 705	$ 683	$ 1,443	3,264	5,080	2,239
Net (charge-offs) recoveries:
Charge-offs									(895)	(2,510)	(692)
Recoveries									1,323	502	460
Net (charge-offs) recoveries									428	(2,008)	(232)
Allowance for loan loss at end of period	$ 19,374				$ 15,682				$ 19,374	$ 15,682	$ 12,610
Net (charge-offs) recoveries to average loans									0.02%	(0.12%)	(0.02%)
Allowance for loan loss to total loans	0.94%				0.86%				0.94%	0.86%	0.78%
Allowance for loan loss to total loans accounted for at historical cost, which excludes loans and the related allowance for loans acquired through acquisition									1.18%	1.25%	1.39%

Changes in Allowance for Loan L

Changes in Allowance for Loan Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of period	$ 15,682	$ 12,610	$ 10,603
Provision for loan losses	3,264	5,080
Net (charge-offs) recoveries:
Charge-offs	(895)	(2,510)	(692)
Recoveries	1,323	502	460
Net (charge-offs) recoveries	428	(2,008)	(232)
Allowance for loan loss at end of period	19,374	15,682	12,610
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of period	5,924	5,864
Provision for loan losses	783	1,781
Net (charge-offs) recoveries:
Charge-offs	(895)	(2,218)
Recoveries	1,318	497
Net (charge-offs) recoveries	423	(1,721)
Allowance for loan loss at end of period	7,130	5,924	5,864
Construction, Land Development and Other Land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of period	2,076	1,684
Provision for loan losses	1,008	392
Net (charge-offs) recoveries:
Allowance for loan loss at end of period	3,084	2,076	1,684
Commercial and Other Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of period	6,821	4,802
Provision for loan losses	1,661	2,306
Net (charge-offs) recoveries:
Charge-offs		(292)
Recoveries	5	5
Net (charge-offs) recoveries	5	(287)
Allowance for loan loss at end of period	8,487	6,821	4,802
Other Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of period	861	260
Provision for loan losses	(188)	601
Net (charge-offs) recoveries:
Allowance for loan loss at end of period	$ 673	$ 861	$ 260

Allowance for Loan Loss and Ass

Allowance for Loan Loss and Associated Loan Balance Classified by Loan Portfolio Segment and by Credit Evaluation Methodology (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 0	$ 0
Collectively evaluated for impairment	19,374	15,682
Total Allowance for Loan Loss	19,374	15,682	$ 12,610	$ 10,603
Loans receivable:
Individually evaluated for impairment	623	1,207
Collectively evaluated for impairment	2,047,891	1,829,944
Total Loans	2,050,226	1,833,163
PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchased credit impaired (loans acquired with deteriorated credit quality)	0	0
Total Allowance for Loan Loss	0	0
Loans receivable:
Purchased credit impaired (loans acquired with deteriorated credit quality)	1,712	2,012
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	7,130	5,924
Total Allowance for Loan Loss	7,130	5,924	5,864
Loans receivable:
Individually evaluated for impairment	378	558
Collectively evaluated for impairment	501,960	536,333
Total Loans	502,637	537,368
Commercial and Industrial | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchased credit impaired (loans acquired with deteriorated credit quality)	0	0
Loans receivable:
Purchased credit impaired (loans acquired with deteriorated credit quality)	299	477
Construction, Land Development and Other Land
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3,084	2,076
Total Allowance for Loan Loss	3,084	2,076	1,684
Loans receivable:
Collectively evaluated for impairment	194,059	125,832
Total Loans	194,059	125,832
Construction, Land Development and Other Land | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchased credit impaired (loans acquired with deteriorated credit quality)	0	0
Commercial and Other Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	8,487	6,821
Total Allowance for Loan Loss	8,487	6,821	4,802
Loans receivable:
Individually evaluated for impairment	245	649
Collectively evaluated for impairment	1,316,849	1,124,667
Total Loans	1,318,507	1,126,851
Commercial and Other Real Estate | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchased credit impaired (loans acquired with deteriorated credit quality)	0	0
Loans receivable:
Purchased credit impaired (loans acquired with deteriorated credit quality)	1,413	1,535
Other Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	673	861
Total Allowance for Loan Loss	673	861	$ 260
Loans receivable:
Collectively evaluated for impairment	35,023	43,112
Total Loans	35,023	43,112
Other Loans | PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchased credit impaired (loans acquired with deteriorated credit quality)	$ 0	$ 0

Risk Category of Loans by Class

Risk Category of Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2,050,226	$ 1,833,163
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	502,637	537,368
Construction, Land Development and Other Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	194,059	125,832
Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,318,507	1,126,851
Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	35,023	43,112
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,971,226	1,770,518
Pass | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	456,885	503,006
Pass | Construction, Land Development and Other Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	194,059	125,832
Pass | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,288,154	1,101,548
Pass | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	32,128	40,132
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	20,331	22,578
Special Mention | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	12,774	16,041
Special Mention | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	7,557	6,494
Special Mention | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		43
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	58,669	40,067
Substandard | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	32,978	18,321
Substandard | Commercial and Other Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	22,796	18,809
Substandard | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2,895	$ 2,937

Age Analysis of Recorded Invest

Age Analysis of Recorded Investment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Accruing	$ 212
Total Non-Accrual	1,122	$ 2,051
Current	2,048,892	1,831,112
Total Loans	2,050,226	1,833,163
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Non-Accrual	675	1,032
Current	501,962	536,336
Total Loans	502,637	537,368
Construction, Land Development and Other Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	194,059	125,832
Total Loans	194,059	125,832
Commercial and Other Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Accruing	212
Total Non-Accrual	447	1,019
Current	1,317,848	1,125,832
Total Loans	1,318,507	1,126,851
Other Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	35,023	43,112
Total Loans	35,023	$ 43,112
Loans 31 to 60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Accruing	212
Loans 31 to 60 Days Past Due | Commercial and Other Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due and Accruing	$ 212

Recorded Investment and Unpaid

Recorded Investment and Unpaid Principal Balances for Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Related Allowance, With a specific allowance recorded	$ 0	$ 0
Related Allowance, With a specific allowance recorded	0	0
Recorded Investment	623	1,207
Unpaid Principal Balance	1,665	1,719
Related Allowance, With a specific allowance recorded	0	0
Average Recorded Investment	653	742	$ 4,991
Interest Income Recognized	0	0
Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	378	558
Unpaid Principal Balance, With no specific allowance recorded	1,383	1,027
Related Allowance, With a specific allowance recorded	0	0
Average Recorded Investment, With no specific allowance recorded	401	672
Interest Income Recognized, With no specific allowance recorded	0	0
Recorded Investment, With a specific allowance recorded	0	0
Unpaid Principal Balance, With a specific allowance recorded	0	0
Related Allowance, With a specific allowance recorded	0	0
Average Recorded Investment, With a specific allowance recorded	0	0
Interest Income Recognized, With a specific allowance recorded	0	0
Recorded Investment	378	558
Unpaid Principal Balance	1,383	1,027
Related Allowance, With a specific allowance recorded	0	0
Average Recorded Investment	401	672
Interest Income Recognized	0	0
Commercial and Other Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	245	649
Unpaid Principal Balance, With no specific allowance recorded	282	692
Related Allowance, With a specific allowance recorded	0	0
Average Recorded Investment, With no specific allowance recorded	252	70
Interest Income Recognized, With no specific allowance recorded	0	0
Recorded Investment, With a specific allowance recorded	0	0
Unpaid Principal Balance, With a specific allowance recorded	0	0
Related Allowance, With a specific allowance recorded	0	0
Average Recorded Investment, With a specific allowance recorded	0	0
Interest Income Recognized, With a specific allowance recorded	0	0
Recorded Investment	245	649
Unpaid Principal Balance	282	692
Related Allowance, With a specific allowance recorded	0	0
Average Recorded Investment	252	70
Interest Income Recognized	$ 0	$ 0

Additional Information on Impai

Additional Information on Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Average recorded investment in impaired loans	$ 653	$ 742	$ 4,991
Interest foregone on impaired loans	89	265	421
Cash collections applied to reduce principal balance	351	1,118	3,014
Interest income recognized on cash collections	$ 0	$ 0	$ 0

Recorded Investment and Unpai76

Recorded Investment and Unpaid Principal Balances for Troubled Debt Restructured Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 408	$ 627	$ 644
Unpaid Principal Balance	1,174	1,363	834
Interest Income Recognized	0	0	0
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Recorded Investment	408	627	530
Unpaid Principal Balance	1,174	1,363	719
Interest Income Recognized	$ 0	$ 0	0
Commercial and Other Real Estate
Financing Receivable, Modifications [Line Items]
Recorded Investment			114
Unpaid Principal Balance			115
Interest Income Recognized			$ 0

Pre and Post Modification Recor

Pre and Post Modification Recorded Investment in TDR Loans (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)Loan	Dec. 31, 2015USD ($)Loan	Dec. 31, 2014USD ($)Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	3	2
Pre-Modification Recorded Investment	$ 650	$ 1,335	$ 338
Post-Modification Recorded Investment	$ 73	$ 208	$ 338
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1	3	1
Pre-Modification Recorded Investment	$ 650	$ 1,335	$ 224
Post-Modification Recorded Investment	$ 73	$ 208	$ 224
Commercial and Other Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			1
Pre-Modification Recorded Investment			$ 114
Post-Modification Recorded Investment			$ 114

Accretable Yield for Loans Acqu

Accretable Yield for Loans Acquired (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Balance, beginning of year	$ 14,610	$ 21,402
Accretion, included in interest income	(4,967)	(6,274)
Additions, due to acquisition	0	0
Reclassifications to non-accretable yield	(32)	(518)
Balance, end of year	$ 9,611	$ 14,610

Carrying Value of Purchased Cre

Carrying Value of Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 1,665	$ 1,719
Carrying Value	623	1,207
Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,383	1,027
Carrying Value	378	558
Commercial and Other Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	282	692
Carrying Value	245	649
PCI Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,619	4,642
Carrying Value	1,712	2,012
PCI Loans | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	622	2,331
Carrying Value	299	477
PCI Loans | Commercial and Other Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,997	2,250
Carrying Value	$ 1,413	1,535
PCI Loans | Other Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		$ 61

Accretable Net Discount of Purc

Accretable Net Discount of Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Acquired Impaired Loans Change In Accretable Yield [Line Items]
Balance, beginning of year	$ 14,610	$ 21,402
Accretion, included in interest income	(4,967)	(6,274)
Balance, end of year	9,611	14,610
PCI Loans
Acquired Impaired Loans Change In Accretable Yield [Line Items]
Balance, beginning of year	246	324
Accretion, included in interest income	(85)	(78)
Reclassifications from non-accretable yield	0	0
Balance, end of year	$ 161	$ 246

Summary of Premises and Equipme

Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment, Net [Abstract]
Furniture and equipment	$ 8,032	$ 8,345
Leasehold improvements	7,382	7,260
Total	15,414	15,605
Less: Accumulated depreciation and amortization	(11,230)	(10,466)
Total	$ 4,184	$ 5,139

Future Minimum Lease Payments f

Future Minimum Lease Payments for Operating Leases for Office and Branch Space Based Upon Obligations (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,017	$ 3,322
2,018	2,493
2,019	2,345
2,020	2,208
2,021	1,903
Thereafter	2,215
Total	$ 14,486

Premises and Equipment and Le83

Premises and Equipment and Lease Commitments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Net [Abstract]
Rental expense on facilities	$ 3.3	$ 3.1	$ 2.2

Schedule of Changes in Carrying

Schedule of Changes in Carrying Value of Goodwill (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Balance, beginning of year		$ 64,603,000	$ 63,950,000
Measurement-period adjustment			653,000
Goodwill acquired during the year		0	0
Impairment losses	$ 0	0	0
Balance, end of year	64,603,000	64,603,000	64,603,000
Accumulated impairment losses at end of year	$ 0	$ 0	$ 0

Goodwill, Core Deposit and Le85

Goodwill, Core Deposit and Leasehold Right Intangibles - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2015	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]
Goodwill increased	$ 653,000
Goodwill write-down	$ 1,100,000
Goodwill, impairment		$ 0	$ 0	$ 0
Core Deposits
Goodwill And Intangible Assets [Line Items]
Weighted average amortization period			5 years 2 months 12 days
Estimated amortization expense, One		1,100,000	$ 1,100,000
Estimated amortization expense, Two		936,000	936,000
Estimated amortization expense, Three		692,000	692,000
Estimated amortization expense, Four		628,000	628,000
Estimated amortization expense, Five		571,000	571,000
Leasehold Right Intangibles
Goodwill And Intangible Assets [Line Items]
Leasehold right intangibles		$ 1,100,000	1,100,000	1,200,000
Net amortization of leasehold right intangible asset and liabilities			(205,000)	$ (62,000)	$ 142,000
1st Enterprise Bank | Leasehold Right Intangibles
Goodwill And Intangible Assets [Line Items]
Fair value adjustment of lease acquired			$ 41,000

Changes in Gross Amounts of Cor

Changes in Gross Amounts of Core Deposit Intangibles and Related Accumulated Amortization (Detail) - Core Deposit Intangible - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gross amount of CDI:
Balance, beginning of year	$ 9,246	$ 9,246	$ 2,103
Additions due to acquisitions			7,143
Balance, end of year	9,246	9,246	9,246
Accumulated Amortization:
Balance, beginning of year	(2,736)	(1,056)	(665)
Amortization	(1,280)	(1,680)	(391)
Balance, end of year	(4,016)	(2,736)	(1,056)
Net CDI, end of year	$ 5,230	$ 6,510	$ 8,190

Bank Owned Life Insurance - Add

Bank Owned Life Insurance - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)Entity	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Insurance [Line Items]
Bank-Owned Life Insurance, holding amount	$ 51,216	$ 49,912
Non-interest income on BOLI policies	1,300	$ 1,300	$ 660
Increase in cash surrender values on policies	$ 51,000
Number of insurance companies | Entity	8
Minimum
Insurance [Line Items]
Bank-Owned Life Insurance balances, outstanding percentage	1.00%
Maximum
Insurance [Line Items]
Bank-Owned Life Insurance balances, outstanding percentage	37.00%
1st Enterprise Bank
Insurance [Line Items]
Increase in cash surrender values on policies	$ 1,300

Investment in California Orga88

Investment in California Organized Investment Network ("COIN") - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
California Organized Investment Network ("COIN")
Investment Holdings [Line Items]
Investment with California Organized Investment Network	$ 1.4	$ 1.1

Schedule of Company's Original

Schedule of Company's Original Investment in Affordable Housing Project (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Original Investment Value	$ 5,050	$ 5,050	$ 5,050
Current Recorded Investment	3,240	3,710	4,141
Unfunded Liability Obligation	578	1,040	2,482
Tax Credits and Benefits	561	543	516
Amortization of Investments	469	436	370
Net Income Tax Benefit	92	107	146
Enterprise Green Communities West II LP
Investment Holdings [Line Items]
Original Investment Value	1,000	1,000	1,000
Current Recorded Investment	513	604	704
Unfunded Liability Obligation	22	69	162
Tax Credits and Benefits	131	136	127
Amortization of Investments	90	92	84
Net Income Tax Benefit	41	44	43
Enterprise Housing Partners Calgreen II Fund LP
Investment Holdings [Line Items]
Original Investment Value	2,050	2,050	2,050
Current Recorded Investment	1,214	1,426	1,588
Unfunded Liability Obligation	165	165	635
Tax Credits and Benefits	218	198	229
Amortization of Investments	212	164	174
Net Income Tax Benefit	6	34	55
Enterprise Housing Partners XXIV LP
Investment Holdings [Line Items]
Original Investment Value	2,000	2,000	2,000
Current Recorded Investment	1,513	1,680	1,849
Unfunded Liability Obligation	391	806	1,685
Tax Credits and Benefits	212	209	160
Amortization of Investments	167	180	112
Net Income Tax Benefit	$ 45	$ 29	$ 48

Schedule of Anticipated Income

Schedule of Anticipated Income Tax Benefit that is Expected to be Recognized (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Schedule of Investments [Line Items]
2,017	$ 121
2,018	120
2,019	120
2,020	117
2021 and thereafter	375
Total - anticipated net income tax benefit in Qualified Affordable Housing Projects	853
Enterprise Green Communities West II LP
Schedule of Investments [Line Items]
2,017	43
2,018	43
2,019	43
2,020	40
2021 and thereafter	72
Total - anticipated net income tax benefit in Qualified Affordable Housing Projects	241
Enterprise Housing Partners Calgreen II Fund LP
Schedule of Investments [Line Items]
2,017	40
2,018	40
2,019	40
2,020	40
2021 and thereafter	134
Total - anticipated net income tax benefit in Qualified Affordable Housing Projects	294
Enterprise Housing Partners XXIV LP
Schedule of Investments [Line Items]
2,017	38
2,018	37
2,019	37
2,020	37
2021 and thereafter	169
Total - anticipated net income tax benefit in Qualified Affordable Housing Projects	$ 318

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Deposits [Line Items]
Amount of time deposits	$ 29,480,000	$ 58,502,000
Amount of Time Deposits maturing in one year	$ 28,000,000
Maturity of time deposits	1 year
Certificates of deposit with balances $250 thousand or more	$ 19,419,000	18,000,000
Insured Cash Sweep Network [Member]
Deposits [Line Items]
Deposits	7,500,000	9,300,000
Insured Cash Sweep Network [Member] | Brokered Deposits
Deposits [Line Items]
Deposits	0
Certificate Of Deposit Account Registry Service
Deposits [Line Items]
Deposits	0	$ 29,000,000
Certificate Of Deposit Account Registry Service | Brokered Deposits
Deposits [Line Items]
Deposits	$ 0

Deposits - Schedule of Maturity

Deposits - Schedule of Maturity of Time Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Maturities of Time Deposits [Abstract]
Three months or less	$ 12,359
Over three through six months	2,034
Over six through twelve months	4,757
Over twelve months	269
Total	$ 19,419	$ 18,000

Borrowings and Subordinated D93

Borrowings and Subordinated Debentures - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016USD ($)Debentures	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2016USD ($)
Debt Instrument [Line Items]
Securities with a fair value	$ 48,000,000	$ 47,000,000
Common stock of FHLB	9,100,000	8,000,000
Current value of FHLB common stock	9,182,000	8,014,000
Maximum advances by FHLB supported by FHLB common stock	340,000,000
Repurchased amount	$ 0	0
Issuance maturity period from its date of issue	30 years
Subordinated debentures, amortization expense	$ 159,000	159,000	$ 159,000
Subordinated Debentures
Debt Instrument [Line Items]
Number of debentures | Debentures	3
Subordinated debentures, fair value	$ 3,300,000
Remaining maturity period	20 years
Estimated annual amortization expense on subordinate debenture	$ 159,000
Subordinate debentures, interest payment terms	The Company has the right, assuming no default has occurred, to defer payments of interest on the subordinated debentures at any time for a period not to exceed 20 consecutive quarters.
Federal Home Loan Bank of San Francisco
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity				$ 723,000,000
Credit facility, percentage of Bank's total assets				25.00%
Outstanding advances (borrowings) with FHLB	$ 0	0
Credit facility, loan collateral pledge	990,000,000
Maximum advances by FHLB	658,000,000
Investment securities pledged with FHLB	16,000,000
Credit facility, maximum borrowing capacity	674,000,000
Trust I | Subordinated Debentures
Debt Instrument [Line Items]
Prepayment penalties	0
Trust II | Subordinated Debentures
Debt Instrument [Line Items]
Prepayment penalties	0
Trust III | Subordinated Debentures
Debt Instrument [Line Items]
Prepayment penalties	$ 0
Minimum
Debt Instrument [Line Items]
Repurchase maturity date	1 day
Maximum
Debt Instrument [Line Items]
Repurchase maturity date	180 days
Securities sold under agreements to repurchase maximum outstanding amount	$ 26,000,000	$ 17,000,000
Credit facility, percentage of Bank's total assets	25.00%

Terms and Maturity of Bank's Se

Terms and Maturity of Bank's Securities Sold under Agreements (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount	$ 18,816	$ 14,360
Interest Rate	0.25%	0.19%
December 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount	$ 18,816
Term	4 days
Maturity Date	Jan. 4, 2017
December 31, 2016 | Minimum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest Rate	0.20%
December 31, 2016 | Maximum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest Rate	0.25%
December 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount		$ 14,360
Term		4 days
Maturity Date		Jan. 4, 2016
December 31, 2015 | Minimum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest Rate		0.08%
December 31, 2015 | Maximum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest Rate		0.25%

Securities Sold under Agreement

Securities Sold under Agreements to Repurchase (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Securities Sold under Agreements to Repurchase [Abstract]
Balance	$ 18,816	$ 14,360
Average Balance	$ 22,739	$ 13,966
Weighted Average Rate	0.23%	0.22%

Subordinated Debentures Outstan

Subordinated Debentures Outstanding (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount, gross	$ 12,372	$ 12,372
Unamortized fair value adjustment	2,516	2,675
Net	9,856	9,697
Trust I
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount, gross	$ 6,186	$ 6,186
Issuance Date	Dec. 10, 2004	Dec. 10, 2004
Maturity Date	Mar. 15, 2035	Mar. 15, 2035
Rate Index	3 month LIBOR+2.05 %	3 month LIBOR+2.05 %
Current Rate	3.01%	2.56%
Next Reset Date	Mar. 15, 2017	Mar. 15, 2016
Trust II
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount, gross	$ 3,093	$ 3,093
Issuance Date	Dec. 23, 2005	Dec. 23, 2005
Maturity Date	Mar. 15, 2036	Mar. 15, 2036
Rate Index	3 month LIBOR+1.75 %	3 month LIBOR+1.75 %
Current Rate	2.71%	2.26%
Next Reset Date	Mar. 15, 2017	Mar. 15, 2016
Trust III
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount, gross	$ 3,093	$ 3,093
Issuance Date	Jun. 30, 2006	Jun. 30, 2006
Maturity Date	Sep. 15, 2036	Sep. 15, 2036
Rate Index	3 month LIBOR+1.85 %	3 month LIBOR+1.85 %
Current Rate	2.81%	2.36%
Next Reset Date	Mar. 15, 2017	Mar. 15, 2016

Derivative Financial Instrume97

Derivative Financial Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016USD ($)AgreementDerivativeFinancial_Institution	Dec. 31, 2015USD ($)
Interest rate swap contracts fair value
Derivative [Line Items]
Required collateral	$ 4,500,000
Investment Securities | Interest rate swap contracts fair value
Derivative [Line Items]
Required collateral	1,800,000
Certificates of Deposits Pledged as Collateral | Interest rate swap contracts fair value
Derivative [Line Items]
Required collateral	$ 2,700,000	$ 2,700,000
1st Enterprise Bank
Derivative [Line Items]
Number of counterparty banks | Financial_Institution	2
Derivative assets liabilities offset	$ 0
Total notional amount of swaps	$ 24,000,000	$ 28,000,000
1st Enterprise Bank | Maximum
Derivative [Line Items]
Outstanding swaps remaining maturity period	7 years
PC Bancorp | Interest rate swap contracts fair value
Derivative [Line Items]
Number of pay-fixed, receive-variable interest rate swap agreements | Agreement	14
Derivatives not Designated as Hedging Instruments | 1st Enterprise Bank | Interest rate swap contracts fair value
Derivative [Line Items]
Swap contracts acquired | Derivative	11
Offsetting interest-rate swaps acquired | Derivative	11
Derivatives Designated as Hedging Instruments | PC Bancorp
Derivative [Line Items]
Number of pay-fixed, receive-variable interest rate swap agreements | Agreement	14
Derivatives Designated as Hedging Instruments | PC Bancorp | Interest rate swap contracts fair value
Derivative [Line Items]
Number of pay-fixed, receive-variable interest rate swap agreements | Agreement	12
Derivatives Designated as Hedging Instruments | PC Bancorp | Maximum
Derivative [Line Items]
Outstanding swaps remaining maturity period	5 years

Balance Sheet Classification of

Balance Sheet Classification of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Asset Derivatives	$ 523	$ 881
Liability Derivatives	1,207	2,545
1st Enterprise Bank | Accrued Interest Payable and Other Liabilities | Interest rate swap contracts fair value
Derivative [Line Items]
Liability Derivatives	523	881
1st Enterprise Bank | Accrued Interest Receivable and Other Assets | Interest rate swap contracts fair value
Derivative [Line Items]
Asset Derivatives	523	881
PC Bancorp | Accrued Interest Payable and Other Liabilities
Derivative [Line Items]
Liability Derivatives	684	1,664
PC Bancorp | Accrued Interest Payable and Other Liabilities | Interest Rate Contracts
Derivative [Line Items]
Liability Derivatives	17,642	25,938
Derivatives not Designated as Hedging Instruments | PC Bancorp | Accrued Interest Payable and Other Liabilities | Interest rate swap contracts fair value
Derivative [Line Items]
Liability Derivatives	95	313
Derivatives Designated as Hedging Instruments | PC Bancorp | Accrued Interest Payable and Other Liabilities | Interest rate swap contracts fair value
Derivative [Line Items]
Liability Derivatives	$ 589	$ 1,351

Effect of Derivative Instrument

Effect of Derivative Instruments on Consolidated Statements of Income (Detail) - Loans Payable - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Increase in fair value of interest rate swap contracts	$ 218	$ 206	$ 219
Payments on interest rate swap contracts on loans and subordinated debentures	(240)	(263)	(273)
Derivatives not Designated as Hedging Instruments | Other Non-Interest Income
Derivative [Line Items]
Net decrease in income	(22)	(57)	(54)
Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Increase in fair value of interest rate swap contracts	762	926	927
Increase (decrease) in fair value of hedged loans	41	133	315
Payments on interest rate swap contracts on loans and subordinated debentures	(821)	(1,089)	(1,256)
Derivatives Designated as Hedging Instruments | Interest Income
Derivative [Line Items]
Net decrease in income	$ (18)	$ (30)	$ (14)

Securities Sold under Repurchas

Securities Sold under Repurchase Agreements and Derivatives Securities Offset in Consolidated Financial Statements Due to an Enforceable Master Netting Arrangement (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting [Abstract]
Interest rate swap contracts fair value - Gross Amounts Recognized in the Consolidated Balance Sheets	$ 523	$ 881
Interest rate swap contracts fair value - Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Interest rate swap contracts fair value - Net Amounts of Assets Presented in the Consolidated Balance Sheets	523	881
Interest rate swap contracts fair value - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	523	881
Interest rate swap contracts fair value - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	0	0
Interest rate swap contracts fair value - Net Amount (Collateral over liability balance required to be pledged)	0	0
Total - Gross Amounts Recognized in the Consolidated Balance Sheets	523	881
Total - Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Total - Net Amounts of Assets Presented in the Consolidated Balance Sheets	523	881
Total - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	523	881
Total - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	0	0
Total - Net Amount (Collateral over liability balance required to be pledged)	0	0
Interest rate swap contracts fair value - Gross Amounts Recognized in the Consolidated Balance Sheets	1,207	2,545
Interest rate swap contracts fair value - Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Interest rate swap contracts fair value - Net Amounts of Assets Presented in the Consolidated Balance Sheets	1,207	2,545
Interest rate swap contracts fair value - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	1,207	2,545
Interest rate swap contracts fair value - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	4,555	4,759
Interest rate swap contracts fair value - Net Amount (Collateral over liability balance required to be pledged)	3,348	2,214
Securities sold under agreements to repurchase - Gross Amounts Recognized in the Consolidated Balance Sheets	18,816	14,360
Securities sold under agreements to repurchase - Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Securities sold under agreements to repurchase - Net Amounts of Assets Presented in the Consolidated Balance Sheets	18,816	14,360
Securities sold under agreements to repurchase - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	18,816	14,360
Securities sold under agreements to repurchase - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	48,204	46,596
Securities sold under agreements to repurchase - Net Amount (Collateral over liability balance required to be pledged)	29,388	32,236
Total - Gross Amounts Recognized in the Consolidated Balance Sheets	20,023	16,905
Total - Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Total - Net Amounts of Assets Presented in the Consolidated Balance Sheets	20,023	16,905
Total - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	20,023	16,905
Total - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	52,759	51,355
Total - Net Amount (Collateral over liability balance required to be pledged)	$ 32,736	$ 34,450

Stock Options and Restricted101

Stock Options and Restricted Stock - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, fair value at merger	$ 9,600,000
Weighted-average period over which the total compensation cost related to unvested restricted stock grants not yet recognized	2 years 6 months
Share based compensation, option Granted	0	0	0
Total intrinsic value of options exercised	$ 6,800,000	$ 6,500,000	$ 2,100,000
Stock-based compensation expense	$ 3,567,000	$ 2,966,000	$ 1,699,000
Weighted-average grant-date fair value per share for restricted stock granted	$ 23.80	$ 21.51	$ 19.39
Total fair value of shares vested	$ 4,300,000	$ 2,700,000	$ 2,300,000
1st Enterprise Bank
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, intrinsic value at merger	$ 11,000,000
Equity Incentive Plan Amended 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation number of shares authorized	1,490,547
Number of shares issued under the plan	1,129,892
Issued shares subsequently cancelled and returned back into the plan	80,916
Share based compensation number of shares available for future issuance	441,571
Stock options issued	0	0	0
2006 Stock Incentive Plan | 1st Enterprise Bank
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options converted under equity plan	802,766
Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued	0	0	0
Nonqualified Stock Options | Original Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options term	10 years
Nonqualified Stock Options | Original Plan | Maximum | Annual Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting percentage per year	50.00%
Nonqualified Stock Options | Original Plan | Minimum | Annual Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting percentage per year	20.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,600,000	$ 2,700,000	$ 1,700,000
Weighted-average grant-date fair value per share for restricted stock granted	$ 23.80
Restricted Stock | Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, option Granted		40,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future compensation expense related to stock options	$ 0
Stock Options | Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, intrinsic value at merger	$ 1,102,000

Future Compensation Expense Rel

Future Compensation Expense Related to Unvested Restricted Stock Grants (Detail) - Restricted Stock $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2,017	$ 2,081
2,018	762
2,019	220
2,020	43
Thereafter	0
Total	$ 3,106

Share Option Activity (Detail)

Share Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Shares
Exercised, Shares	(505,274)
Equity Plan | Stock Options
Shares
Outstanding stock options at beginning, Shares	557,471
Granted, Shares	0
Exercised, Shares	(505,274)
Forfeited, Shares	0
Expired, Shares	(4,500)
Outstanding stock options at ending, Shares	47,697	557,471
Exercisable options at December 31, 2016, Shares	47,697
Unvested options at December 31, 2016, Shares	0
Weighted Average Exercise Price
Outstanding stock options at beginning, Weighted Average Exercise Price	$ 10.57
Granted, Weighted Average Exercise Price	0
Exercised, Weighted Average Exercise Price	0
Forfeited, Weighted Average Exercise Price	0
Expired, Weighted Average Exercise Price	0
Outstanding stock options at end, Weighted Average Exercise Price	12.69	$ 10.57
Exercisable options at end, Weighted Average Exercise Price	12.69
Unvested options at end, Weighted Average Exercise Price	$ 0
Weighted Average Remaining Contractual Term
Outstanding stock options at December 31, 2016	1 year 5 months 5 days	9 months 18 days
Exercisable options at end, Weighted Average Remaining Contractual Term	1 year 5 months 5 days
Aggregate Intrinsic Value
Outstanding stock options at beginning, Aggregate Intrinsic Value	$ 1,102	$ 8,248
Exercisable options at end, Aggregate Intrinsic Value	1,102
Unvested options at end, Aggregate Intrinsic Value	$ 0

Restricted Stock Activity (Deta

Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Weighted-Average Grant-Date Fair Value per Share
Granted, Weighted-Average Grant-Date Fair Value per Share	$ 23.80	$ 21.51	$ 19.39
Restricted Stock
Number of Shares
Unvested, at beginning, Number of Shares	311,458
Granted, Number of Shares	142,309
Vested, Number of Shares	(160,310)
Cancelled and forfeited, Number of Shares	(11,375)
Unvested, at end, Number of Shares	282,082	311,458
Weighted-Average Grant-Date Fair Value per Share
Unvested, at beginning, Weighted-Average Grant-Date Fair Value per Share	$ 19.29
Granted, Weighted-Average Grant-Date Fair Value per Share	23.80
Vested, Weighted-Average Grant-Date Fair Value per Share	18.93
Cancelled and forfeited, Weighted-Average Grant-Date Fair Value per Share	20.88
Unvested, at end, Weighted-Average Grant-Date Fair Value per Share	$ 21.98	$ 19.29

Stock Options and Restricted105

Stock Options and Restricted Stock - Summary of Excess Tax Benefits Recognized by Award Type (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards Exercised or Vested	665,584
Related Excess Tax Benefits	$ 1,437	$ 1,274	$ 582
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards Exercised or Vested	505,274
Related Excess Tax Benefits	$ 914
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards Exercised or Vested	160,310
Related Excess Tax Benefits	$ 523

Supplemental Executive Retir106

Supplemental Executive Retirement Plan and Other Deferred Compensation Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Participants vesting percentage of their own deferral account	100.00%
Supplemental Executive Retirement Plan and Other Deferred Compensation Plans
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	$ 4,900	$ 3,300
Accrued Split Dollar Employee insurance plan	1,200	1,200
Supplemental Executive Retirement Plan and Other Deferred Compensation Plans | 1st Enterprise Bank
Defined Benefit Plan Disclosure [Line Items]
Participants vesting percentage of their own deferral account			100.00%
Maximum tenure for payments to be made to the employees after employment			10 years
Deferred compensation expense	1,000	947	$ 705
Supplemental Executive Retirement Plan and Other Deferred Compensation Plans | PC Bancorp
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	1,000	1,100
Split dollar life insurance expense	69	68	$ 72
Deferred Director Fee Plan | PC Bancorp
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	$ 251	$ 282

Defined Contribution Plan Four

Defined Contribution Plan Four Zero One K - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan Disclosure [Line Items]
Participants vesting percentage of their own deferrals	100.00%
Matching contribution percentage by employer	50.00%	50.00%	50.00%
Contributions made to employees	$ 548	$ 642	$ 418
Maximum
Defined Contribution Plan Disclosure [Line Items]
Employee maximum contribution percentage	2.50%	3.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Tax Rate [Line Items]
Uncertain tax positions	$ 0	$ 0	$ 0
Net tax benefits	92,000	107,000	146,000
Capital Loss Carryforward
Effective Tax Rate [Line Items]
Tax carryforward			$ 172,000
Expiration year			2,019
State
Effective Tax Rate [Line Items]
Operating loss carrying forward				$ 1,200,000
Operating loss carryforward expiration year				2,032
PC Bancorp | State | Capital Loss Carryforward
Effective Tax Rate [Line Items]
Tax carryforward	$ 54,000	$ 54,000
Expiration year	2,016

Income Tax Expense (Detail)

Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current provision
Federal									$ 10,921	$ 9,265	$ 4,517
State									3,653	2,923	1,183
Total current provision									14,574	12,188	5,700
Deferred provision
Federal									923	291	382
State									456	389	350
Total deferred provision									1,379	680	732
Total current and deferred provision	$ 4,037	$ 4,059	$ 3,952	$ 3,905	$ 3,312	$ 3,355	$ 3,506	$ 2,695	$ 15,953	$ 12,868	$ 6,432

Components of Net Deferred Tax

Components of Net Deferred Tax Assets Recognized in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets
Federal tax operating loss carryforward	$ 60	$ 64
State tax operating loss carryforward	165	170
Allowance for loan loss	9,293	7,473
Purchase accounting and loan fair value adjustments	3,820	7,024
Accruals and other liabilities	929	958
Stock compensation and deferred compensation costs	4,618	5,732
Net unrealized loss on securities available-for-sale	2,190	593
Start up, organizational and other costs	244	332
Total deferred tax assets	21,319	22,346
Deferred Tax Liabilities
State tax liability	(64)	(441)
Unamortized fair value on subordinated debentures	(1,153)	(1,230)
Core deposit intangibles	(2,397)	(2,984)
Prepaid expense and other	(518)	(652)
Total deferred tax liabilities	(4,132)	(5,307)
Valuation allowance	(6)	(6)
Deferred tax assets, net	$ 17,181	$ 17,033

Reconciliation of Statutory Inc

Reconciliation of Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rate									$ 15,193	$ 11,937	$ 5,369
State franchise taxes, net of federal benefit, excluding LIHTC investments									2,743	2,236	1,209
Release of state valuation allowance on use of net operating loss										(29)	(68)
Meals and entertainment, dues and other non-deductible items									142	132	75
Cash surrender life insurance									(456)	(453)	(231)
Stock compensation expense									(68)	(100)	(53)
Excess tax benefit from stock transactions									(1,196)
LIHTC investments									(111)	(141)	(119)
Merger costs											515
Tax Exempt Income									(290)	(314)
Other									(4)	(400)	(265)
Total current and deferred provision	$ 4,037	$ 4,059	$ 3,952	$ 3,905	$ 3,312	$ 3,355	$ 3,506	$ 2,695	$ 15,953	$ 12,868	$ 6,432
Federal income tax expense at statutory rate									35.00%	35.00%	35.00%
State franchise taxes, net of federal benefit, excluding LIHTC investments									6.32%	6.55%	7.88%
Release of state valuation allowance on use of net operating loss										(0.09%)	(0.44%)
Meals and entertainment, dues and other non-deductible items									0.33%	0.39%	0.49%
Cash surrender life insurance									(1.05%)	(1.33%)	(1.51%)
Stock compensation expense									(0.16%)	(0.29%)	(0.35%)
Excess tax benefit from stock transactions									(2.75%)
LIHTC investments									(0.25%)	(0.41%)	(0.77%)
Merger costs											3.36%
Tax Exempt Income									(0.67%)	(0.92%)
Other									(0.01%)	(1.17%)	(1.73%)
Combined federal and state tax, effective rate									36.76%	37.73%	41.93%

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Nov. 30, 2018	Mar. 01, 2016	Nov. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Shares issued during period upon exercise of stock options				505,274
Shares issued during period upon exercise of stock options for total value				$ 5,185	$ 4,299	$ 2,029
Preferred stock, liquidation preference per share			$ 1,000	$ 1,000
Preferred Stock
Class of Stock [Line Items]
Preferred stock issued						16,400
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share				$ 1,000	$ 1,000
Coupon dividend rate		9.00%
Series A Preferred Stock | Scenario, Forecast
Class of Stock [Line Items]
Dividend yield from business combination accounting	7.00%
1st Enterprise Bank
Class of Stock [Line Items]
Number of Non-Cumulative Perpetual Preferred Stock, Series D converted to Non-Cumulative Perpetual Preferred Stock, Series A			16,400
Preferred stock estimated period				4 years
Preferred stock net discount				$ 479
Preferred stock accretion on net discount				$ 1,000
1st Enterprise Bank | Preferred Stock
Class of Stock [Line Items]
Fair value of preferred stock			$ 16,000
1st Enterprise Bank | SBLF
Class of Stock [Line Items]
Preferred stock issued			16,400
Restricted Stock
Class of Stock [Line Items]
Shares of restricted stock issued to employees and directors				142,309
Share based compensation, unvested restricted shares cancelled				52,591
Shares repurchased of restricted stock value				$ 1,400
Unvested Restricted Stock
Class of Stock [Line Items]
Share based compensation, unvested restricted shares cancelled				11,375

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components Of Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 306,807	$ 279,192	$ 137,924
Related tax effect	1,490	683	(260)
Reclassification of (gain) loss on investment securities available-for-sale to net income	(258)	(112)	47
Related tax effect	108	47	(20)
Other Comprehensive Income (Loss)	(2,203)	(1,006)	395
Ending Balance	338,185	306,807	279,192
Unrealized Gains (Losses) on Investment Securities
Components Of Other Comprehensive Income Loss [Line Items]
Beginning Balance	(816)	190	(205)
Net unrealized gain (loss) arising during the period	(3,543)	(1,624)	628
Ending Balance	$ (3,019)	$ (816)	$ 190

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Allowance for losses on unfunded loan commitments	$ 886,000	$ 608,000
Legal proceedings against the company	0
Commitments to Extend Credit
Other Commitments [Line Items]
Financial instruments with off balance sheet risk	1,000,000,000	806,000,000
Commitments to Extend Credit | Standby Letters of Credit
Other Commitments [Line Items]
Financial instruments with off balance sheet risk	$ 85,000,000	$ 73,000,000

Regulatory Matters - Additional

Regulatory Matters - Additional Information (Detail) - USD ($) $ in Thousands	Nov. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust preferred securities included in tier one risk based capital asset					$ 15,000,000
Dividend payment on preferred shares		$ 1,257	$ 183	$ 41
Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust preferred securities tier one capital		25.00%
1st Enterprise Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Number of Non-Cumulative Perpetual Preferred Stock, Series D converted to Non-Cumulative Perpetual Preferred Stock, Series A	16,400
Dividend payment on preferred shares		$ 369
SBLF | 1st Enterprise Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preferred stock issued	16,400

Compliance with Regulatory Capi

Compliance with Regulatory Capital Requirements under Banking Regulations (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
CU Bancorp
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio	9.72%	9.67%
Common Equity Tier 1 ratio	9.61%	9.61%
Total Tier 1 risk-based capital ratio	10.68%	10.85%
Total risk-based capital ratio	11.44%	11.54%
Common Equity Tier 1, Amount	$ 257,105	$ 223,977
Total Tier 1 capital, Amount	285,843	252,681
Total risk-based capital, Amount	306,103	268,971
Average total assets, Amount	2,940,790	2,611,774
Risk-weighted assets, Amount	$ 2,675,987	$ 2,329,770
CU Bancorp | Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio, Well Capitalized	5.00%
Common Equity Tier 1 ratio, Well Capitalized	6.50%
Total Tier 1 risk-based capital ratio, Well Capitalized	8.00%
Total risk-based capital ratio, Well Capitalized	10.00%
Tier 1 leverage ratio, Basel III Minimum With Buffer
Common Equity Tier 1 ratio, Basel III Minimum With Buffer	5.125%
Total Tier 1 risk-based capital ratio, Basel III Minimum With Buffer	6.625%
Total risk-based capital ratio, Basel III Minimum With Buffer	8.625%
California United Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio	9.35%	9.34%
Common Equity Tier 1 ratio	10.28%	10.47%
Total Tier 1 risk-based capital ratio	10.28%	10.47%
Total risk-based capital ratio	11.04%	11.17%
Common Equity Tier 1, Amount	$ 275,151	$ 243,989
Total Tier 1 capital, Amount	275,151	243,989
Total risk-based capital, Amount	295,411	260,279
Average total assets, Amount	2,941,253	2,612,206
Risk-weighted assets, Amount	$ 2,677,030	$ 2,329,798
California United Bank | Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio, Well Capitalized	5.00%
Common Equity Tier 1 ratio, Well Capitalized	6.50%
Total Tier 1 risk-based capital ratio, Well Capitalized	8.00%
Total risk-based capital ratio, Well Capitalized	10.00%
Tier 1 leverage ratio, Basel III Minimum With Buffer
Common Equity Tier 1 ratio, Basel III Minimum With Buffer	5.125%
Total Tier 1 risk-based capital ratio, Basel III Minimum With Buffer	6.625%
Total risk-based capital ratio, Basel III Minimum With Buffer	8.625%

Financial Assets and Financial

Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	$ 469,950	$ 315,785
Interest Rate Swap Contracts	523	881
Interest Rate Swap Contracts	1,207	2,545
U.S. Govt Agency and Sponsored Agency - Note Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	9,969	1,014
U.S. Govt Agency - SBA Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	122,850	93,490
U.S. Govt Agency - GNMA Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	22,370	30,700
U.S. Govt Sponsored Agency - CMO & Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	238,900	97,154
Corporate Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale		4,023
Asset Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	6,896	7,647
U. S. Treasury Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	68,965	80,746
Municipal Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale		1,011
Interest rate swap contracts fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Contracts	523	881
Interest Rate Swap Contracts	1,207	2,545
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	68,965	80,746
Quoted Prices in Active Markets for Identical Assets (Level 1) | U. S. Treasury Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	68,965	80,746
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	401,508	235,920
Significant Other Observable Inputs (Level 2) | U.S. Govt Agency and Sponsored Agency - Note Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	9,969	1,014
Significant Other Observable Inputs (Level 2) | U.S. Govt Agency - SBA Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	122,850	93,490
Significant Other Observable Inputs (Level 2) | U.S. Govt Agency - GNMA Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	22,370	30,700
Significant Other Observable Inputs (Level 2) | U.S. Govt Sponsored Agency - CMO & Mortgage-Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	238,900	97,154
Significant Other Observable Inputs (Level 2) | Corporate Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale		4,023
Significant Other Observable Inputs (Level 2) | Asset Backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	6,896	7,647
Significant Other Observable Inputs (Level 2) | Municipal Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale		1,011
Significant Other Observable Inputs (Level 2) | Interest rate swap contracts fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Contracts	523	881
Interest Rate Swap Contracts	$ 1,207	$ 2,545

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets measured at fair value on recurring basis	$ 0	$ 0
Financial liabilities measured at fair value on recurring basis	0	0
Fair Value Hierarchy for Assets Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfer of assets in or out of Level 3	0	0
Fair value assets transfer from level 1 to level 2	0	0
Fair value assets transfer from level 2 to level 1	0	0
Fair Value Hierarchy for Asset Measured on Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfer of assets in or out of Level 3	0	0
Fair value assets transfer from level 1 to level 2	0	0
Fair value assets transfer from level 2 to level 1	$ 0	$ 0

Balances of Assets Measured at

Balances of Assets Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value Hierarchy for Asset Measured on Non-recurring Basis - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans)	$ 73
SBA Servicing Asset	940	$ 1,147
Other real estate owned		325
Total	1,013	1,472
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans)	73
SBA Servicing Asset	940	1,147
Other real estate owned		325
Total	$ 1,013	$ 1,472

Losses Related to Nonrecurring

Losses Related to Nonrecurring Fair Value Measurements (Detail) - Fair Value Hierarchy for Asset Measured on Non-recurring Basis - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 508	$ 133	$ 222
Collateral Dependent Impaired Loans With Specific Valuation Allowance And/Or Partial Charge-Off
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 508		$ 222
Other Real Estate Owned
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets		$ 133

Significant Unobservable Inputs

Significant Unobservable Inputs Used in Fair Value Measurements for Level 3 Assets Measured at Fair Value on Recurring or Non-Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value Hierarchy for Asset Measured on Non-recurring Basis
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, fair value	$ 1,013	$ 1,472
Collateral Dependent Impaired Loans With Specific Valuation Allowance And/Or Partial Charge-Off | Fair Value Hierarchy for Asset Measured on Non-recurring Basis
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, fair value	$ 73
Collateral Dependent Impaired Loans With Specific Valuation Allowance And/Or Partial Charge-Off | Credit Loss Estimate of Aged Accounts Receivable Collateral
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Model and/or Factors	Credit loss factors on aging of accounts receivable collateral
Credit loss factors on aging of accounts receivable collateral	20.00%
SBA Servicing Assets | Fair Value Hierarchy for Asset Measured on Non-recurring Basis
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, fair value	$ 940	$ 1,147
SBA Servicing Assets | Discounted Cash Flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rates	13.00%	12.00%
Estimated average remaining life of SBA portfolio	39 months	61 months
SBA Servicing Assets | Discounted Cash Flow - Discount Rates
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Model and/or Factors	Discount Rates	Discount Rates
SBA Servicing Assets | Discounted Cash Flow - Prepayment Speed
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Model and/or Factors	Prepayment Speed	Prepayment Speed
Other Real Estate Owned | Fair Value Hierarchy for Asset Measured on Non-recurring Basis
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, fair value		$ 325
Other Real Estate Owned | Broker Opinion of Value
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Model and/or Factors		Sales approach Estimated selling costs
Estimated selling costs		6.00%

Level in Fair Value Hierarchy f

Level in Fair Value Hierarchy for Financial Instruments Estimated Fair Values (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 41,281	$ 50,960
Interest earning deposits in other financial institutions	167,789	171,103
Investment securities held-to-maturity, Carrying Amount	42,027	42,036
Loans, net, Carrying Amount	2,030,852	1,817,481
Bank owned life insurance, Carrying Amount	51,216	49,912
FHLB Stock, Carrying Amount	9,100	8,000
Certificates of deposit, Carrying Amount	29,480	58,502
Securities sold under agreements to repurchase, Carrying Amount	18,816	14,360
Subordinated debentures, Carrying Amount	9,856	9,697
Cash and due from banks	41,281	50,960
Interest earning deposits in other financial institutions	167,789	171,103
Investment securities held-to-maturity	41,937	42,339
Loans, net, Fair Value	2,054,701	1,851,220
Bank owned life insurance, Fair Value	51,216	49,912
FHLB Stock, Fair Value	9,182	8,014
Certificates of deposit, Fair Value	29,480	58,502
Securities sold under agreements to repurchase, Fair Value	18,816	14,360
Subordinated debentures, Fair Value	12,372	12,372
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	41,281	50,960
Interest earning deposits in other financial institutions	167,789	171,103
Investment securities held-to-maturity, Carrying Amount	42,027	42,036
Loans, net, Carrying Amount	2,030,852	1,817,481
Bank owned life insurance, Carrying Amount	51,216	49,912
FHLB Stock, Carrying Amount	9,182	8,014
Certificates of deposit, Carrying Amount	29,480	58,502
Securities sold under agreements to repurchase, Carrying Amount	18,816	14,360
Subordinated debentures, Carrying Amount	9,856	9,697
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	41,281	50,960
Interest earning deposits in other financial institutions	167,789	171,103
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities held-to-maturity	41,937	42,339
Certificates of deposit, Fair Value	29,480	58,502
Securities sold under agreements to repurchase, Fair Value	18,816	14,360
Subordinated debentures, Fair Value	12,372	12,372
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net, Fair Value	2,054,701	1,851,220
Bank owned life insurance, Fair Value	51,216	49,912
FHLB Stock, Fair Value	$ 9,182	$ 8,014

Summary Quarterly Data (Detail)

Summary Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Interest Income	$ 26,151	$ 25,855	$ 24,997	$ 24,249	$ 23,807	$ 23,106	$ 21,941	$ 21,288	$ 101,252	$ 90,142	$ 55,177
Interest Expense	820	807	748	771	705	704	668	646	3,146	2,723	1,922
Net interest income	25,331	25,048	24,249	23,478	23,102	22,402	21,273	20,642	98,106	87,419	53,255
Provision for loan losses	882	697	1,063	622	2,249	705	683	1,443	3,264	5,080	2,239
Net interest income after provision for loan losses	24,449	24,351	23,186	22,856	20,853	21,697	20,590	19,199	94,842	82,339	51,016
Non-interest income	3,159	3,058	2,975	2,820	3,039	2,988	3,095	2,608	12,012	11,730	7,709
Non-interest expense	16,401	16,767	15,089	15,187	15,073	15,067	14,912	14,913	63,444	59,965	43,385
Net income before provision for income tax expense	11,207	10,642	11,072	10,489	8,819	9,618	8,773	6,894	43,410	34,104	15,340
Provision for income tax expense	4,037	4,059	3,952	3,905	3,312	3,355	3,506	2,695	15,953	12,868	6,432
Net Income	7,170	6,583	7,120	6,584	5,507	6,263	5,267	4,199	27,457	21,236	8,908
Preferred stock dividends and discount accretion or premium amortization	303	304	307	303	297	293	312	272	1,217	1,174	124
Net Income available to common shareholders	$ 6,867	$ 6,279	$ 6,813	$ 6,281	$ 5,210	$ 5,970	$ 4,955	$ 3,927	$ 26,240	$ 20,062	$ 8,784
Basic income per share	$ 0.39	$ 0.36	$ 0.40	$ 0.37	$ 0.31	$ 0.36	$ 0.30	$ 0.24	$ 1.52	$ 1.21	$ 0.77
Diluted income per share	$ 0.39	$ 0.36	$ 0.39	$ 0.36	$ 0.30	$ 0.35	$ 0.29	$ 0.23	$ 1.50	$ 1.18	$ 0.75

Parent Company Condensed Balanc

Parent Company Condensed Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 41,281	$ 50,960
Loans	2,030,852	1,817,481
Accrued interest receivable and other assets	48,132	35,734
Total Assets	2,994,760	2,634,642
LIABILITIES
Subordinated debentures	9,856	9,697
Accrued interest payable and other liabilities	20,514	16,987
Total Liabilities	2,656,575	2,327,835
SHAREHOLDERS' EQUITY	338,185	306,807	$ 279,192	$ 137,924
Total Liabilities and Shareholders' Equity	2,994,760	2,634,642
CU Bancorp
ASSETS
Cash and due from banks	9,715	6,756
Loans	148	882
Investment in subsidiary	339,683	310,263
Accrued interest receivable and other assets	463	4
Total Assets	350,009	317,905
LIABILITIES
Subordinated debentures	9,856	9,697
Accrued interest payable and other liabilities	1,968	1,401
Total Liabilities	11,824	11,098
SHAREHOLDERS' EQUITY	338,185	306,807
Total Liabilities and Shareholders' Equity	$ 350,009	$ 317,905

Parent Company Condensed Income

Parent Company Condensed Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income	$ 26,151	$ 25,855	$ 24,997	$ 24,249	$ 23,807	$ 23,106	$ 21,941	$ 21,288	$ 101,252	$ 90,142	$ 55,177
Interest Expense	820	807	748	771	705	704	668	646	3,146	2,723	1,922
Income tax benefit	(4,037)	(4,059)	(3,952)	(3,905)	(3,312)	(3,355)	(3,506)	(2,695)	(15,953)	(12,868)	(6,432)
Net Income	$ 7,170	$ 6,583	$ 7,120	$ 6,584	$ 5,507	$ 6,263	$ 5,267	$ 4,199	27,457	21,236	$ 8,908
CU Bancorp
Interest Income									59	71
Interest Expense									487	438
Operating Expenses									649	676
Total Expenses									1,136	1,114
Loss Before Income Tax Benefit and Equity in Undistributed Earnings of Subsidiary									(1,077)	(1,043)
Income tax benefit									478	466
Loss Before Equity in Undistributed Earnings of Subsidiary									(599)	(577)
Equity in undistributed earnings of subsidiary									28,056	21,813
Net Income									$ 27,457	$ 21,236

Parent Company Condensed Cash F

Parent Company Condensed Cash Flow Statement (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income:	$ 7,170	$ 6,583	$ 7,120	$ 6,584	$ 5,507	$ 6,263	$ 5,267	$ 4,199	$ 27,457	$ 21,236	$ 8,908
Adjustments to reconcile net income to net cash used in operating activities:
Accretion of subordinated debenture discount									159	159	159
Increase in accrued interest receivable and other assets									(12,398)	456	2,428
Increase (decrease) in accrued interest payable and other liabilities									4,884	(1,964)	2,041
Net cash (used in) provided by operating activities									22,589	21,364	12,618
Cash flows from financing activities:
Net proceeds from exercise of stock options									5,185	4,299	2,029
Restricted stock repurchase									(1,371)	(971)	(471)
Dividends paid on preferred stock									(1,257)	(183)	(41)
Net increase (decrease) in cash and cash equivalents									(12,993)	89,477	(108,701)
Cash and cash equivalents, beginning of year				222,063				132,586	222,063	132,586	241,287
Cash and cash equivalents, end of year	209,070				222,063				209,070	222,063	132,586
Supplemental disclosures of cash flow information:
Cash paid during the period for interest									3,333	2,877	1,801
CU Bancorp
Cash flows from operating activities:
Net income:									27,457	21,236
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed earnings of subsidiary									(28,056)	(21,813)
Net accretion of discounts/premiums									(10)	(19)
Accretion of subordinated debenture discount									159	159
Increase in accrued interest receivable and other assets									(536)	(27)
Increase (decrease) in accrued interest payable and other liabilities									644	(84)
Net cash (used in) provided by operating activities									(342)	(548)
Cash flows from investing activities:
Capital contribution made to subsidiary										(1,000)
Net decrease in loans									744	547
Net cash (used in) provided by investing activities									744	(453)
Cash flows from financing activities:
Net proceeds from exercise of stock options									5,185	4,299
Restricted stock repurchase									(1,371)	(971)
Dividends paid on preferred stock									(1,257)	(183)
Net cash provided by financing activities									2,557	3,145
Net increase (decrease) in cash and cash equivalents									2,959	2,144
Cash and cash equivalents, beginning of year				$ 6,756				$ 4,612	6,756	4,612
Cash and cash equivalents, end of year	$ 9,715				$ 6,756				9,715	6,756	$ 4,612
Supplemental disclosures of cash flow information:
Cash paid during the period for interest									$ 328	$ 277

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016USD ($)Relationship	Dec. 31, 2015USD ($)
Minimum
Related Party Transaction [Line Items]
Beneficial owners, Ownership percentage	5.00%
Affiliates Including Principal Shareholders
Related Party Transaction [Line Items]
Related party transaction, Amount	$ 0	$ 0
Executive Officers and Directors
Related Party Transaction [Line Items]
Related party transaction, Amount	$ 0	0
Number of lending relationships | Relationship	1
Immediate Family or Associates of Any of the Foregoing Persons
Related Party Transaction [Line Items]
Related party transaction, Amount	$ 0	0
Trust for Benefit of Employees
Related Party Transaction [Line Items]
Related party transaction, Amount	$ 0	$ 0