CU Bancorp (CUNB) Inactive 10-K13 Mar 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Mar. 09, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	CUNB
Entity Registrant Name	CU Bancorp
Entity Central Index Key	1543643
Current Fiscal Year End Date	-19
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		16,732,061
Entity Public Float			$190.50

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$33,996	$23,156
Interest earning deposits in other financial institutions	98,590	218,131
Total cash and cash equivalents	132,586	241,287
Certificates of deposit in other financial institutions	76,433	60,307
Investment securities available-for-sale, at fair value	226,962	106,488
Investment securities held-to-maturity, at amortized cost	47,147
Total investment securities	274,109	106,488
Loans	1,624,723	933,194
Allowance for loan loss	-12,610	-10,603
Net loans	1,612,113	922,591
Premises and equipment, net	5,377	3,531
Deferred tax assets, net	16,504	11,835
Other real estate owned, net	850
Goodwill	63,950	12,292
Core deposit and leasehold right intangibles	9,547	2,525
Bank owned life insurance	38,732	21,200
Accrued interest receivable and other assets	34,916	25,760
Total Assets	2,265,117	1,407,816
LIABILITIES AND SHAREHOLDERS' EQUITY
Non-interest bearing demand deposits	1,032,634	632,192
Interest bearing transaction accounts	206,544	155,735
Money market and savings deposits	643,675	380,915
Certificates of deposit	64,840	63,581
Total deposits	1,947,693	1,232,423
Securities sold under agreements to repurchase	9,411	11,141
Subordinated debentures, net	9,538	9,379
Accrued interest payable and other liabilities	19,283	16,949
Total Liabilities	1,985,925	1,269,892
Commitments and Contingencies (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, issued and outstanding at December 31, 2014 and 0 shares issued and outstanding at December 31, 2013	16,004
Common stock - authorized, 75,000,000 shares no par value, 16,683,856 and 11,081,364 shares issued and outstanding at December 31, 2014 and 2013, respectively	226,389	121,675
Additional paid-in capital	19,748	8,377
Retained earnings	16,861	8,077
Accumulated other comprehensive income (loss)	190	-205
Total Shareholders' Equity	279,192	137,924
Total Liabilities and Shareholders' Equity	$2,265,117	$1,407,816

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
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	$0	$0
Common stock, shares issued	16,683,856	11,081,364
Common stock, shares outstanding	16,683,856	11,081,364
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	0
Preferred stock, shares outstanding	16,400	0

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income
Interest and fees on loans	$51,882	$48,201	$34,268
Interest on investment securities	2,369	1,913	2,421
Interest on interest bearing deposits in other financial institutions	926	732	807
Total Interest Income	55,177	50,846	37,496
Interest Expense
Interest on interest bearing transaction accounts	278	238	184
Interest on money market and savings deposits	963	1,027	927
Interest on certificates of deposit	216	255	264
Interest on securities sold under agreements to repurchase	34	74	90
Interest on subordinated debentures	431	485	332
Total Interest Expense	1,922	2,079	1,797
Net Interest Income	53,255	48,767	35,699
Provision for loan losses	2,239	2,852	1,768
Net Interest Income After Provision For Loan Losses	51,016	45,915	33,931
Non-Interest Income
Gain (Loss) on sale of securities, net	-47	47	0
Other-than-temporary impairment losses	0		-155
Gain on sale of SBA loans, net	1,221	1,087	50
Deposit account service charge income	2,744	2,377	2,130
Other non-interest income	3,791	3,007	1,936
Total Non-Interest Income	7,709	6,518	3,961
Non-Interest Expense
Salaries and employee benefits (includes stock based compensation expense of $1,699, $1,088 and $1,120 for the years ended December 31, 2014, 2013 and 2012, respectively)	26,519	22,870	18,729
Occupancy	4,112	4,194	3,564
Data processing	1,968	1,868	1,905
Legal and professional	2,006	2,166	1,350
FDIC deposit assessment	844	880	719
Merger expenses	2,302	43	3,058
OREO valuation write-downs and expenses	15	95	343
Office services expenses	1,026	1,034	1,127
Other operating expenses	4,593	4,490	3,705
Total Non-Interest Expense	43,385	37,640	34,500
Net Income Before Provision for Income Tax Expense	15,340	14,793	3,392
Provision for income tax expense	6,432	5,008	1,665
Net Income	8,908	9,785	1,727
Preferred stock dividends and discount accretion	124
Net Income available to common shareholders	$8,784	$9,785	$1,727
Earnings Per Share
Basic earnings per share	$0.77	$0.93	$0.21
Diluted earnings per share	$0.75	$0.90	$0.21

Consolidated_Statements_of_Inc1

Consolidated Statements of Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Stock based compensation expense	$1,699	$1,088	$1,120

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net Income	$8,908	$9,785	$1,727
Other Comprehensive Income (Loss), net of tax:
Non-credit portion of other-than-temporary impairments arising during the period		-22	464
Net unrealized gains (losses) on investment securities arising during the period	395	-1,577	40
Other Comprehensive Income (Loss)	395	-1,599	504
Comprehensive Income	$9,303	$8,186	$2,231

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Equity (USD $)	Total	Preferred Stock	Common Stock	Additional Paid in Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2011	$80,844,000		$77,225,000	$6,164,000	($3,435,000)	$890,000
Beginning Balance (in shares) at Dec. 31, 2011			6,950,000
Net issuance of restricted stock			110,000
Exercise of stock options (in shares)	0
Issuance of common stock (in shares)			3,721,000
Issuance of common stock	41,660,000		41,660,000
Stock based compensation expense related to employee stock options and restricted stock	1,120,000			1,120,000
Restricted stock repurchase (in shares)			-22,000
Restricted stock repurchase	-228,000			-228,000
Excess tax deficiency - Stock based compensation	-4,000			-4,000
Net Income	1,727,000				1,727,000
Other Comprehensive Income (Loss)	504,000					504,000
Ending Balance at Dec. 31, 2012	125,623,000		118,885,000	7,052,000	-1,708,000	1,394,000
Ending Balance (in shares) at Dec. 31, 2012			10,759,000
Net issuance of restricted stock	69,450		69,000
Exercise of stock options (in shares)	282,031		282,000
Exercise of stock options	2,790,000		2,790,000
Stock based compensation expense related to employee stock options and restricted stock	1,088,000			1,088,000
Restricted stock repurchase (in shares)			-29,000
Restricted stock repurchase	-422,000			-422,000
Excess tax benefit - stock based compensation	659,000			659,000
Net Income	9,785,000				9,785,000
Other Comprehensive Income (Loss)	-1,599,000					-1,599,000
Ending Balance at Dec. 31, 2013	137,924,000		121,675,000	8,377,000	8,077,000	-205,000
Ending Balance (in shares) at Dec. 31, 2013			11,081,000
Net issuance of restricted stock	167,884		168,000
Exercise of stock options (in shares)	221,016		221,000
Exercise of stock options	2,029,000		2,029,000
Issuance of preferred stock for 1st Enterprise merger, net of fair value discount	15,921,000	15,921,000
Issuance of preferred stock for 1st Enterprise merger, shares		16,400,000
Issuance of common stock (in shares)			5,240,000
Issuance of common stock	102,685,000		102,685,000
Issuance of replacement stock options for 1st Enterprise merger	9,561,000			9,561,000
Stock based compensation expense related to employee stock options and restricted stock	1,699,000			1,699,000
Restricted stock repurchase (in shares)			-26,000
Restricted stock repurchase	-471,000			-471,000
Excess tax benefit - stock based compensation	582,000			582,000
Preferred stock dividends and discount accretion	124,000	83,000			-124,000
Net Income	8,908,000				8,908,000
Other Comprehensive Income (Loss)	395,000					395,000
Ending Balance at Dec. 31, 2014	$279,192,000	$16,004,000	$226,389,000	$19,748,000	$16,861,000	$190,000
Ending Balance (in shares) at Dec. 31, 2014		16,400,000	16,684,000

Consolidated_Statements_of_Sha1

Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Issuance of common stock, net issuance costs	$27	$199

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net Income	$8,908	$9,785	$1,727
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,239	2,852	1,768
Provision for unfunded loan commitments	142	73	34
Stock based compensation expense	1,699	1,088	1,120
Depreciation	1,019	1,082	1,022
Net accretion of discounts/premiums for loans acquired and deferred loan fees/costs	-5,360	-6,158	-3,654
Net amortization from investment securities	1,677	1,642	1,403
Increase in bank owned life insurance	-661	-617	-267
Amortization of core deposit intangibles	391	309	219
Amortization of time deposit premium	-42	-141	-140
Net amortization of leasehold right intangible asset and liabilities	142	-313	-315
Accretion of subordinated debenture discount	159	210	94
Loss on disposal of fixed assets	7	15	5
OREO valuation write-downs			232
Gain on sale of OREO		-23
Net other-than-temporary impairment losses recognized in operations	0		155
Loss (gain) on sale of securities, net	47	-47	0
Gain on sale of SBA loans, net	-1,221	-1,087	-50
Decrease (increase) in deferred tax assets	732	3,101	-751
Decrease (increase) in accrued interest receivable and other assets	2,428	-7,558	-668
Increase in accrued interest payable and other liabilities	2,041	6,459	1,282
Net excess in tax benefit on stock compensation	-582
Decrease in fair value of derivative swap liability	-1,147	-2,095	-599
Net cash provided by operating activities	12,618	8,577	2,888
Cash flows from investing activities:
Cash and cash equivalents acquired in acquisition, net of cash paid	8,650		41,716
Purchases of available-for-sale investment securities	-52,042	-36,318	-7,255
Proceeds from sales of available-for-sale investment securities	25,156	6,968	17,278
Proceeds from repayment and maturities from available-for-sale investment securities	23,080	36,703	29,720
Loans originated, net of principal payments	-132,846	-72,116	-84,387
Purchases of premises and equipment	-1,042	-1,206	-823
Proceeds from sale of OREO		3,135
Net (increase) decrease in certificates of deposit in other financial institutions	-4,572	-33,301	12,849
Purchase of bank owned life insurance			-14,000
Net redemption of FHLB and other bank stock		150	866
Net cash used in investing activities	-133,616	-95,985	-4,036
Cash flows from financing activities:
Net increase in non-interest bearing demand deposits	67,591	88,665	82,080
Net increase in interest bearing transaction accounts	8,033	42,988	40,893
Net (decrease) increase in money market and savings deposits	-55,236	40,449	-38,646
Net decrease in certificates of deposit	-8,433	-17,614	-30,951
Net decrease in securities sold under agreements to repurchase	-1,730	-11,716	-3,330
Net proceeds from stock options exercised	2,029	2,790
Issuance costs of common stock for 1st Enterprise merger	-27
Restricted stock repurchase	-471	-422	-228
Dividends paid on preferred stock	-41
Net (deficiency) excess in tax benefit on stock compensation	582	659	-4
Net cash provided by financing activities	12,297	145,799	49,814
Net increase (decrease) in cash and cash equivalents	-108,701	58,391	48,666
Cash and cash equivalents, beginning of year	241,287	182,896	134,230
Cash and cash equivalents, end of year	132,586	241,287	182,896
Supplemental disclosures of cash flow information:
Cash paid during the year for interest	1,801	2,029	1,681
Net cash paid (refunds received) during the year for taxes	3,725	-270	2,685
Supplemental disclosures of non-cash investing activities:
Net increase (decrease) in unrealized gains (losses) on investment securities, net of tax	395	-1,577	504
Loans transferred to other real estate owned	850
Supplemental disclosures related to acquisitions:
Assets acquired	833,497		397,030
Liabilities assumed	705,214		354,708
Issuance of 16,400 shares of preferred stock	15,921
Cash paid for fractional and dissenter shares and stock options	$89		$456

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
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. CU Bancorp was established to facilitate the reorganization and merger of Premier Commercial Bank, N.A. into California United Bank, which took place after the close of business on July 31, 2012. As a bank holding company, CU Bancorp is subject to regulation of the Federal Reserve Board (“FRB”). See Note 2 – Business Combinations. The term “Company”, as used throughout this document, refers to the consolidated balance sheets and consolidated statements of income 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, with its headquarters office located in Encino, California. As a state chartered non-member bank, the Bank is subject to regulation by the California Department of Business Oversight, (the “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, entities which were acquired in the merger with Premier Commercial Bancorp (“PC Bancorp”). 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 Financial Statements
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America 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 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. 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 changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan loss. Regulatory agencies may require the Company to recognize additions to the allowance for loan loss based on their judgment about information available to them at the time of their examination.

	Business Combinations
	The Company has a number of fair value adjustments recorded within the consolidated financial statements at December 31, 2014 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 include the Company’s goodwill, fair value adjustments on loans, core deposit intangible assets, other intangible assets, fair value adjustments to acquired lease obligations, fair value adjustments to high rate certificates of deposit and fair value adjustments on derivatives. The assets and liabilities acquired through acquisition 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. Goodwill is not amortized and is reviewed for impairment on October 1st of each year. If an event occurs or circumstances change that results in the Company’s fair value declining to below its book value, the Company would perform an impairment analysis at that time.
	Based on the Company’s 2014 goodwill impairment analysis, no impairment to goodwill has occurred. The Company is a sole reporting unit for evaluation of goodwill. We believe the estimated fair value of the Company is above its carrying value at December 31, 2014.
	The core deposit intangibles on non-maturing deposits, which represent the intangible value of depositor relationships resulting from deposit liabilities assumed through acquisition, are being amortized over the projected useful lives of the deposits. The weighted remaining life of the core deposit intangible is estimated at approximately 7 years at December 31, 2014. Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable.
	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. For non-PCI loans, loan fair value adjustments consist of an interest rate premium or discount on each individual loan and are amortized to loan interest income based on the effective yield method over the remaining life of the loans.
	Business Segments
	The Company is organized and operated as a single reporting segment, principally engaged in commercial business banking. The Company conducts its lending and deposit operations through ten 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 $12,450,000 and $1,129,000 were required by the Federal Reserve Bank of San Francisco as of December 31, 2014 and 2013, respectively. As of December 31, 2014, the Bank was in compliance with all known U.S. Federal Reserve Bank (“Federal Reserve”) reporting and reserve requirements. At December 31, 2014 and 2013 respectively, the Company had $4.1 million and $4.3 million pledged as collateral for its interest rate swap agreements with two counterparty banks.
	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, including interest earning deposits with the Federal Reserve. These deposits and investments can generally provide the Company with immediate liquidity and generally can be liquidated the same day as is the case with the Federal Reserve and up to 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 $250,000 and have original maturity of between 30 days and 12 months. The current remaining maturities of the Company’s certificates of deposit at December 31, 2014 range from 2 days to 12 months with a weighted average maturity of 5.9 months and a weighted average yield of 0.62%.
	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, 2014, 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 $30.0 million in non-interest bearing accounts, $30.8 million in interest bearing accounts, and $2.5 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 classification. 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 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. Under the held-to-maturity classification, if the Company has the intent and the ability at the time of purchase to hold these 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 these defaulted loans through the foreclosure process.
	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 the FHLB, Pacific Coast Bankers Bank (“PCBB”) and The Independent Banker’s Bank (“TIB”) and the preferred stock of TIB is carried at cost 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 FHLB has reported earnings for the years ended December 31, 2014, 2013, and 2012, and remains in compliance with its regulatory capital and liquidity requirements. See Note 5 – Investment Securities, Investments in FHLB Common Stock. With consideration given to these factors, management concluded that the stock was not impaired at December 31, 2014, 2013 or 2012.
	The Company’s investment in FHLB stock is included in other assets on the accompanying 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 their outstanding unpaid principal balances, net of deferred loan fees, unearned discounts, fair value credit valuation allowance and net of the allowance for loan loss. The Company recognizes loan origination fees to the extent they represent reimbursement for initial direct costs, as income at the time of loan boarding. The excess of fees over costs, if any, is deferred and recognized in 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 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.”
	Nonaccrual loans: For all loan types, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. Generally, the Company places loans in a nonaccrual status and the accrual of interest on loans is discontinued when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest is unlikely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent, if the loan is well secured by collateral and in the process of collection.
	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: A loan is identified as impaired when it is probable that interest and principal will not be collected according to the contractual terms of the original loan agreement. Generally, these loans are rated substandard or worse. Most impaired loans are classified as nonaccrual. However, there are some loans that are designated impaired due to doubt regarding collectability according to contractual terms, but are both fully secured by collateral and are current in their interest and principal payments. These impaired loans that are not classified as nonaccrual continue to pay as agreed. Impaired loans are measured for reserve requirements based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, as a practical expedient, at the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are charged against the allowance for loan loss. Factors that contribute to a performing loan being classified as impaired include payment status, collateral value, probability of collecting scheduled payments, delinquent taxes, and debts to other lenders that cannot be serviced out of existing cash flow.
	Troubled debt restructurings: A loan is classified as a troubled debt restructuring when a borrower experiences financial difficulties that lead to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. The loan terms which have been modified or restructured due to a borrower’s financial difficulty may include a reduction in the stated interest rate, an extension of the maturity at an interest rate below current market interest rates, a reduction in the face amount of the debt (principal forgiveness), a reduction in the accrued interest, or re-aging, extensions, deferrals, renewals, rewrites and other actions intended to minimize potential losses.

	Troubled debt restructurings are considered impaired loans and are evaluated for the amount of 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 has granted 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.
	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. The Company generally requires a period of sustained repayment for at least six months for return to accrual status.
	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, 2014 and 2013, 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 noninterest 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, 2014 is adequate to absorb known and probable losses 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 reserve is established when the fair value of the impaired loan is lower than the carrying value 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 reserves. The individual loan is evaluated for a specific reserve 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. Impaired loans are evaluated by comparing the fair value of the collateral less costs to sell, if the loan is collateral dependent, and the present value of the expected future cash flows discounted at the loan’s effective interest rate, if the loan is not collateral dependent.

	•		Not all impaired loans require a specific reserve. 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 because a partial charge off of the loan has been taken. In those instances, neither a general reserve nor a specific reserve 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 ten 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
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. Revenue and expenses from operations and additions to the valuation allowance are included in other expenses.

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 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 to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on the Company’s balance sheet. There was no impairment as of December 31, 2014 or 2013. The increase in goodwill in 2014 was the result of the merger with 1^st Enterprise Bank on November 30, 2014. For more discussion, see Note 2 – Business Combinations.
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 balance sheet.
Leasehold right intangible is the difference in the fair value of an acquired lease and the amount of payments required to be made under the lease obligation. 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 Company’s balance sheet.
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. In December 2013, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2014-01, Investments – Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). ASU 2014-1 modifies the 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 modified conditions are met, the amendments permit an entity 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 the Company to account for its investments in LIHTC under ASU 2014-1. 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, 2014. 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) were recognized on the consolidated balance sheet at their current fair value. For derivatives designated as fair value hedges, changes in the fair value of the derivative and hedged item related to the hedged risk are recognized in earnings. ASC Topic 815 establishes the accounting and reporting standards requiring that every derivative instrument (including certain derivative instruments embedded in other contracts) 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. The Company also formally assesses the hedge’s current effectiveness in offsetting changes in the fair values of the hedged items. On an ongoing basis, the derivatives that are used in hedging transactions are evaluated 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 and Other Taxes
Deferred income tax assets and liabilities are computed using the asset and liability method, which recognizes a liability or asset representing the tax effects, based on current tax law, of future deductible or taxable amounts attributable to events that have been recognized in the financial statements. 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 operating 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 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.
Comprehensive Income
The Company has adopted accounting guidance issued by FASB that requires all items recognized under accounting standards as components of comprehensive income be reported in a financial statement that is displayed with the same prominence as other financial statements. This also requires that an entity classify items of other comprehensive income by their nature in an annual financial statement. Other comprehensive income includes unrealized gains and losses, net of tax, on marketable securities classified as available-for-sale.
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
In January 2014, the FASB issued ASU No. 2014-04, Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon foreclosure (a consensus of the FASB Emerging Issues Task Force). The objective of this Update is to reduce diversity in practice by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 clarifies that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. These amendments are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. An entity can elect to adopt these amendments using either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. We do not expect the adoption of this ASU to have a material impact on the Company’s financial position or results of operations.
In June 2014, the FASB issued ASU No. 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures, to address investor concerns about the distinction in generally accepted accounting principles between repurchase agreements that settle at the same time as the maturity of the transferred financial asset and those that settle any time before maturity. ASU 2014-11 aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions all will be accounted for as secured borrowings. The new guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. ASU 2014-11 also requires a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. Further, the ASU requires expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The accounting changes are effective for public companies for the first interim or annual period beginning after December 15, 2014. In addition, for public companies, the disclosure for certain transactions accounted for as a sale is effective for the first interim or annual period beginning after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and interim periods beginning after March 15, 2014. Earlier application for a public company is prohibited, but all other companies and organizations may elect to apply the requirements for interim periods beginning after December 15, 2014. We do not expect the adoption of this ASU to have an impact on the Company’s financial position or results of operations.
In August 2014, the FASB issued ASU No. 2014-14, Receivables – Troubled Debt Restructuring by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure. This ASU will require creditors to derecognize certain foreclosed government-guaranteed mortgage loans and to recognize a separate other receivable that is measured at the amount the creditor expects to recover from the guarantor, and to treat the guarantee and the receivable as a single unit of account. ASU 2014-14 is effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. For entities other than public business entities, the ASU is effective for annual periods ending after December 15, 2015, and interim periods within annual periods thereafter. An entity can elect a prospective or a modified retrospective transition method, but must use the same transition method that it elected under FASB ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. Early adoption, including adoption in an interim period, is permitted if the entity already adopted ASU 2014-04. We do not expect the adoption of this ASU to have a material impact on the Company’s financial position or results of operations.
In November 2014, the FASB issued ASU No. 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or to Equity. This ASU will require an entity to determine the nature of the host contract by considering the economic characteristics and risks of the entire hybrid financial instrument issued in the form of a share, including the embedded derivative feature that is being evaluated for separate accounting from the host contract when evaluating whether the host contract is more akin to debt or equity. In evaluating the stated and implied substantive terms and features, the existence or omission of any single term or feature does not necessarily determine the economic characteristics and risks of the host contract. Although an individual term or feature may weigh more heavily in the evaluation on the basis of facts and circumstances, an entity should use judgment based on an evaluation of all the relevant terms and features. ASU 2014-16 is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. For all other entities, the ASU is effective for fiscal years ending after December 15, 2015, and interim periods within fiscal years thereafter. The effects of initially adopting the amendments should be applied on a modified retrospective basis to existing hybrid financial instruments issued in the form of a share as of the beginning of the fiscal year for which the amendment is effective. Retrospective application is permitted to all relevant prior periods. Early adoption, including adoption in an interim period, is permitted. If an entity early adopts the amendments in an interim period, any adjustments shall be reflected as of the beginning of the fiscal year that includes that interim period. We do not expect the adoption of this ASU to have an impact on the Company’s financial position or results of operations.

Business_Combinations

Business Combinations	12 Months Ended
Business Combinations	Dec. 31, 2014
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 the 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 ($102.7 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.
	The results of 1st Enterprise’s operations are included in the Consolidated Statements of Income from the date of acquisition. In connection with the merger, the consideration paid, the assets acquired, and the liabilities assumed were recorded at fair value on the date of acquisition, as summarized in the following table (dollars in thousands):


			November 30,
			2014
	Assets acquired:
	Cash and due from banks		$	8,739
	Interest earning deposits in other financial institutions			11,554
	Investment securities available-for-sale			117,407
	Investment securities held-to-maturity			47,457
	Loans			553,183
	Premises and equipment, net			1,830
	Deferred tax asset			5,682
	Goodwill			51,658
	Core deposit and leasehold right intangibles			7,533
	Bank owned life insurance			16,871
	Accrued interest receivable and other assets			11,583

	Total assets acquired		$	833,497

	Liabilities assumed:
	Deposits		$	703,358
	Accrued interest payable and other liabilities			1,856

	Total liabilities assumed		$	705,214

	Total consideration paid		$	128,283

	1st Enterprise operated as a full-service independent commercial banking institution in the Southern California market with three branches located in downtown Los Angeles, Orange County and the Inland Empire and a loan production office in the San Fernando Valley. 1st Enterprise and the Bank have complementary business models and both have developed strong commercial banking platforms and production capabilities, low-cost deposit bases and robust credit cultures. The merger offers further delivery of sophisticated personal service to their target, small and middle-market business, entrepreneurs, non-profits and professional customers. The merger will provide the combined institution with financial benefits that include reduced combined operating expenses and synergies.
	In accordance with GAAP, the Company expensed approximately $2.3 million of merger expenses and recorded $51.7 million of goodwill and $7.4 million of other intangible assets. The $2.3 million merger expense is included in the Company’s historical income statement for the year ended December 31, 2014. The other intangible assets are primarily related to core deposits and are being amortized on an accelerated basis over a period of approximately ten years in proportion to the related estimated benefits. The assets and liabilities of 1st Enterprise were accounted for at fair value and required either a third party analysis or an internal valuation analysis of fair value. An analysis was performed on loans, investment securities, contractual lease obligations, deferred compensation, deposits, premises and equipment, other assets, other liabilities and preferred stock as of the merger date. Balances that were considered to be at fair value at the date of acquisition were cash and cash equivalents, bank owned life insurance, derivatives, other assets (interest receivable), and certain other liabilities (interest payable). For tax purposes, acquisition accounting adjustments, including goodwill are not taxable or deductible.
	The following table summarizes the fair value of the total consideration transferred as part of the merger with 1st Enterprise as well as the fair value adjustments to 1st Enterprise’s balance sheet as of the acquisition date and the resulting goodwill:


							November 30,
							2014
	Consideration paid:
	CU Bancorp common stock issued						$	102,712
	CU Bancorp preferred stock issued							15,921
	Fair value of 1st Enterprise stock options							9,561
	Cash paid to a dissenter shareholder							87
	Cash in lieu of fractional shares paid to 1st Enterprise shareholders							2

	Total consideration							128,283
	Net assets of 1st Enterprise at November 30, 2014							75,205
	Fair value adjustments:
	Investment securities		$	1,779
	Loans, net			(12,362	)
	Premises and equipment			(377	)
	Deferred taxes			3,019
	Core deposits and leasehold intangibles			7,424
	Other assets			(52	)
	Other liabilities			1,989

	Total fair value adjustments							1,420

	Fair value of net assets acquired						$	76,625

	Excess of consideration paid over fair value of net assets acquired (goodwill)						$	51,658

	We estimated the fair value for most loans acquired from 1^st Enterprise by utilizing a methodology wherein loans with comparable characteristics were aggregated by type of collateral, whether loans are fixed, adjustable, interest only or have balloon structures. Other considerations included risk ratings, delinquency history, performance status (accrual or non-accrual) and other relevant factors. The discounted cash flow approach (“DCF”) was used to arrive at the fair value of the loans acquired. Projected cash flows were determined by estimating future credit losses and prepayment rates, which were then discounted to present value at a risk-adjusted discount rate for similar loans.

	There was no carryover of 1^st Enterprise’s allowance for loan losses associated with the loans acquired as the loans were initially recorded at fair value.
Purchased Credit Impaired (“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 presents the fair value of loans pursuant to accounting standards for PCI and non-PCI loans as of the 1^st Enterprise acquisition date (dollars in thousands):


		November 30,
		2014
		PCI loans				Non-PCI loans			Total
Contractually required payments		$	577			$	569,276		$	569,853
Less: non-accretable difference			(108	)			—			(108	)

Cash flows expected to be collected (undiscounted)			469				569,276			569,745
Accretable yield			—				(16,562	)		(16,562	)

Fair value of acquired loans		$	469			$	552,714		$	553,183

Pro Forma Financial Information
The following table presents financial information regarding 1^st Enterprise operations included in our consolidated statement of income from the date of acquisition, November 30, 2014, through December 31, 2014. The following table also presents unaudited pro forma information for the periods 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).


		1^st Enterprise actual				Proforma			Proforma
		results from				Year ended			Year ended
		acquisition date				December 31,			December 31,
		through
		December 31, 2014				2014			2013
Net interest income after provision for loan losses		$	2,023			$	77,140		$	68,771
Net income			766			$	17,218		$	15,299

Preferred stock dividends and discount accretion							(1,234	)		(889	)

Net income available to common shareholders						$	15,984		$	14,410

Diluted earnings per share						$	0.94		$	0.87

The accompanying financial statements below include the accounts of PC Bancorp since the acquisition date July 31, 2012. The following unaudited pro forma information presents select financial information for the periods indicated as though the PC Bancorp merger had been completed as of January 1, 2011. The 2012 and 2011 pro forma net income excludes non-recurring merger expenses, net of taxes of approximately $2.6 million and $183,000, respectively (dollars in thousands, except for per share data).


Supplemental Proforma Financial Data		Twelve Months Ended
PC Bancorp Merger		December 31,
		2012				2011
Net interest income		$	42,939			$	41,529
Net income		$	2,281			$	2,787
Diluted earnings per share		$	0.21			$	0.27
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, 2013 for 1^st Enterprise and January 1, 2011 for PC Bancorp, nor are they intended to represent or be indicative of future results of operations. The proforma results do not include expected operating cost savings as a result of the acquisitions. 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_

Computation of Book Value and Tangible Book Value per Common Share	12 Months Ended
	Dec. 31, 2014
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 shareholders’ 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 per share data):


		Years Ended
		December 31,
		2014		2013
	Total Shareholders’ Equity	$	279,192	$	137,924
	Less: Preferred stock		16,004		—
	Less: Goodwill		63,950		12,292
	Less: Core deposit and leasehold right intangibles		9,547		2,525

	Tangible Shareholders’ Equity	$	189,691	$	123,107

	Common shares issued and outstanding		16,683,856		11,081,364
	Book value per common share	$	15.78	$	12.45

	Tangible book value per common share	$	11.37	$	11.11

Computation_of_Earnings_per_Co

Computation of Earnings per Common Share	12 Months Ended
Computation of Earnings per Common Share	Dec. 31, 2014
Earnings Per Share [Abstract]
Computation of Earnings per Common Share	Note 4 – Computation of Earnings per Common Share
	Basic and diluted earnings per common share were determined by dividing the net income available to common stockholders by the applicable basic and diluted weighted average common shares outstanding. The following table shows weighted average basic shares outstanding, potential dilutive shares related to stock options, unvested restricted stock, and weighted average diluted shares for each of the periods indicated (dollars in thousands, except per share data):


		Years Ended
		December 31,
		2014		2013		2012
	Net Income	$	8,908	$	9,785	$	1,727
	Less: Preferred stock dividends and discount accretion		124		—		—

	Net Income available to common shareholders	$	8,784	$	9,785	$	1,727

	Weighted average basic common shares outstanding		11,393,445		10,567,436		8,283,599
	Dilutive effect of potential common share issuances from stock options and restricted stock		274,288		269,425		127,150

	Weighted average diluted common shares outstanding		11,667,733		10,836,861		8,410,749

	Income per common share
	Basic	$	0.77	$	0.93	$	0.21
	Diluted	$	0.75	$	0.9	$	0.21

	Anti-dilutive shares not included in the calculation of diluted		79,000		81,000		245,833
	earnings per share		79,000		81,000		245,833

Investment_Securities

Investment Securities	12 Months Ended
Investment Securities	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Note 5 – Investment Securities
	The Company’s 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 and estimated fair values of investment securities by major category as of the dates indicated (dollars in thousands):


						Gross Unrealized
	December 31, 2014		Amortized			Gains			Losses			Estimated
	December 31, 2014		Cost			Gains			Losses			Fair Value
	Available-for-sale:
	U.S. Govt Agency and Sponsored Agency – Note Securities		$	2,036		$	2		$	—		$	2,038
	U.S. Govt Agency – SBA Securities			54,062			770			345			54,487
	U.S. Govt Agency – GNMA Mortgage-Backed Securities			29,364			255			277			29,342
	U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities			107,348			457			577			107,228
	Corporate Securities			4,043			77			—			4,120
	Municipal Securities			1,039			11			—			1,050
	Asset Backed Securities			8,711			1			40			8,672
	U.S. Treasury Notes			20,031			—			6			20,025

	Total available-for-sale			226,634			1,573		$	1,245			226,962
	Held-to-maturity:
	Municipal Securities			47,147			169			157			47,159

	Total held-to-maturity			47,147			169		$	157			47,159

	Total investment securities		$	273,781		$	1,742		$	1,402		$	274,121



						Gross Unrealized
	December 31, 2013		Amortized			Gains			Losses			Estimated
	December 31, 2013		Cost			Gains			Losses			Fair Value
	Available-for-sale:
	U.S. Govt Agency and Sponsored Agency – Note Securities		$	4,153		$	1		$	2		$	4,152
	U.S. Govt Agency – SBA Securities			50,521			875			491			50,905
	U.S. Govt Agency – GNMA Mortgage-Backed Securities			28,107			180			909			27,378
	U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities			15,348			345			479			15,214
	Corporate Securities			5,086			125			—			5,211
	Municipal Securities			3,621			9			2			3,628

	Total available-for-sale			106,836			1,535			1,883			106,488

	Total investment securities		$	106,836		$	1,535		$	1,883		$	106,488

	The Company’s investment securities portfolio at December 31, 2014, consists of U.S. Treasury Notes, U.S. Agency and U.S. Sponsored Agency issued AAA and AA rated investment-grade callable and non-callable bonds, mortgage-backed pass through securities, asset backed securities and collateralized mortgage obligation “CMO” securities, investment grade corporate bond securities and investment grade municipal securities. As of December 31, 2014 and December 31, 2013, securities with a fair value of $89.3 million and $53.98 million were pledged as collateral for securities sold under agreements to repurchase, public deposits, outstanding standby letters of credit and other purposes as required by various statutes and agreements.
	The Company had no securities that were classified as other-than-temporarily impaired at December 31, 2014 or 2013. The following tables present investment securities with unrealized losses that are considered to be temporarily-impaired, summarized and classified according to the duration of the loss period as of the dates indicated (dollars in thousands).


			< 12 Continuous						> 12 Continuous						Total
			Months						Months						Total
	December 31, 2014		Fair			Net			Fair			Net			Fair			Net
			Value			Unrealized			Value			Unrealized			Value			Unrealized
						Loss						Loss						Loss
	Temporarily-impaired available-for-sale investment securities:
	U.S. Govt. Agency – SBA Securities		$	10,688			87		$	10,095		$	258		$	20,783		$	345
	U.S. Govt. Agency – GNMA Mortgage-Backed Securities			12,784			65			8,784			212			21,568			277
	U.S. Govt. Sponsored Agency CMO & Mortgage-Backed Securities			64,360			413			6,584			164			70,944			577
	Asset Backed Securities			4,849			40			—			—			4,849			40
	U.S. Treasury Notes			20,025			6			—			—			20,025			6

	Total temporarily-impaired available-for-sale investment securities		$	112,706		$	611		$	25,463		$	634		$	138,169		$	1,245

	Temporarily-impaired held-to-maturity investment securities:
	Municipal Securities		$	23,966		$	157		$	—		$	—		$	23,966		$	157

Total temporarily-impaired held-to-maturity investment securities		$	23,966		$	157		$	—		$	—		$	23,966		$	157



		< 12 Continuous						> 12 Continuous						Total
		Months						Months						Total
December 31, 2013		Fair			Net			Fair			Net			Fair			Net
		Value			Unrealized			Value			Unrealized			Value			Unrealized
					Loss						Loss						Loss
Temporarily-impaired available-for-sale investment securities:
U.S. Govt. – Agency and Sponsored Agency Note Securities		$	1,041		$	2		$	—		$	—		$	1,041		$	2
U.S. Govt. Agency – SBA Securities			11,686			491			—			—			11,686			491
U.S. Govt. Agency – GNMA Mortgage-Backed Securities			15,693			721			1,864			188			17,557			909
U.S. Govt. Sponsored Agency CMO & Mortgage-Backed Securities			7,650			479			—			—			7,650			479
Municipal Securities			—			—			1,029			2			1,029			2

Total temporarily-impaired available-for-sale investment securities		$	36,070		$	1,693		$	2,893		$	190		$	38,963		$	1,883

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.
The amortized cost, estimated fair value and average yield of debt securities at December 31, 2014, 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

	•		Investment grade Corporate Bonds and Municipal securities – maturity 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, 2014
Maturities Schedule of Securities		Amortized			Fair Value			Weighted
		Cost						Average
								Yield
Due through one year		$	28,307		$	28,467			1.73	%
Due after one year through five years			109,021			109,245			1.65	%
Due after five years through ten years			62,641			62,389			1.91	%
Due after ten years			26,665			26,861			2.55	%

Total		$	226,634		$	226,962			1.83	%



		December 31, 2013
Maturities Schedule of Securities		Amortized			Fair Value			Weighted
		Cost						Average
								Yield
Due through one year		$	17,574		$	17,759			1.69	%
Due after one year through five years			37,733			38,168			2.04	%
Due after five years through ten years			25,486			24,952			2.41	%
Due after ten years			26,043			25,609			2.75	%

Total		$	106,836		$	106,488			2.24	%

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, 2014, 2013 and 2012 the Company recognized gross gains and (losses) on sales of available-for-sale securities and held-to-maturity securities in the amount of $(47,000), $47,000 and $0, respectively. The Company had net proceeds from the sale of available-for-sale securities and held-to-maturity securities of $25.2 million $7.0 million and $17.3 million during the years ended December 31, 2014, 2013 and 2012, respectively.
Investments in FHLB Common Stock
The Company’s investment in the common stock of the FHLB is carried at cost and was $8.0 million and $4.7 million as of December 31, 2014 and 2013, respectively. 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 2013 and 2014. The Company has received cash dividends from the FHLB of $320,000 and $199,000 for the years ending December 31, 2014 and 2013, respectively. The Company acquired $3.8 million of FHLB common stock in 2014 as part of the acquisition of 1^st Enterprise. The FHLB made common stock redemptions of $150,300 during the year ending December 31, 2013. There was no such activity during the year ended December 31, 2014.
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.
The investment in FHLB stock is periodically evaluated for impairment based on, among other things, the capital adequacy of the FHLB and its overall financial condition. No impairment losses have been recorded through December 31, 2014 and based on the current financial condition of the FHLB, no impairment losses appear necessary or warranted.
The Company’s investment in FHLB stock is included in other assets on the accompanying balance sheets.

Loans

Loans	12 Months Ended
Loans	Dec. 31, 2014
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,
			2014			2013
	Commercial and Industrial Loans:		$	528,517		$	299,473
	Loans Secured by Real Estate:
	Owner-Occupied Nonresidential Properties			339,309			197,605
	Other Nonresidential Properties			481,517			271,818
	Construction, Land Development and Other Land			72,223			47,074
	1-4 Family Residential Properties			121,985			65,711
	Multifamily Residential Properties			52,813			33,780

	Total Loans Secured by Real Estate			1,067,847			615,988

	Other Loans:			28,359			17,733

	Total Loans		$	1,624,723		$	933,194

	Loans are made to individuals, as well as commercial and tax exempt entities. 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 law of the Company’s loans. These policies are reviewed and approved by the Board of Directors on a regular basis.
	Commercial and Industrial Loans: Commercial credit is extended primarily to middle market businesses, professional enterprises and their owners for business purposes. Typical loan types are working capital loans, loans for financing capital expenditures, asset acquisition loans and other business loans. Loans to closely held businesses will generally be guaranteed in full or in a meaningful amount by the businesses’ major owners. Commercial loans are made based primarily on the historical and projected cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types.
	Commercial Real Estate Loans: The Company’s goal is to create and maintain a high quality portfolio of commercial real estate loans with customers who meet the quality and relationship profitability objectives of the Company. These loans include owner-occupied nonresidential properties and other nonresidential properties. Owner-occupied nonresidential property loans are subject to underwriting standards and processes similar to commercial and industrial loans. These loans are viewed primarily as cash flow loans and the repayment of these loans is largely dependent on the successful operation of the business. Other nonresidential property loans are also subject to strict underwriting standards and processes. For these loans the Company looks at the underlying cash flows from these properties, which include: the debt service coverage, the cash flow from the existing tenants in the property, the historical vacancy of the property, the financial strength of the tenants, and the type and duration of signed leases. Loan performance of commercial real estate loans may be adversely affected by factors impacting the general economy or conditions specific to the real estate market such as geographic location and/or property type.

	Construction and Land Development Loans: The Company defines construction loans as loans where the loan proceeds are controlled by the Company and used for the improvement of real estate in which the Company holds a deed of trust. Land development loans are loans on vacant land that may be developed by the owner of the property sometime in the future. Due to the inherent risk in this type of loan, they are subject to other specific underwriting policy guidelines outlined in the Company’s Credit Risk Policy and are monitored closely.
	Residential Loans: The Company originates residential real estate loans as either home equity lines of credit or multifamily “apartment loans.” Home equity lines of credit (“HELOCs”) are made to individuals and to business principals with whom the Company maintains, in most cases, either a business lending or deposit relationship. The underwriting standards are typical of home equity products with loan to value and debt service considerations. Multifamily loans are underwritten based on the projected cash flows of the property with consideration of market conditions and values where the property is located.
	Other Loans: The Company originates loans to individuals for personal expenditures and investments that the Company maintains in most cases either a deposit or business relationship with. Also included in this category are loans to non-depository financial institutions.
	Purchased loans: Loans acquired in acquisitions are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan loss. Loans acquired with deteriorated credit quality are loans that have evidence of credit deterioration since origination and it is probable at the date of acquisition that the Company will not collect principal and interest payments according to the contractual terms of the original loan agreement. Evidence of credit quality deterioration as of the purchase date may include factors such as past due and non-accrual status. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the credit loss. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. Subsequent decreases to the expected cash flows will generally result in a provision for loan losses.
	Restructured loans: Loans may be restructured in an effort to maximize collections. The Company may use various restructuring techniques, including, but not limited to, deferral of past due interest or principal, redeeming past due taxes, reduction of interest rates, extending maturities and modification of amortization schedules. The Company does not typically forgive principal balances or past due interest prior to pay-off or surrender of the property.
	Concentrations
	The Company makes commercial, construction, commercial real estate, and consumer home equity loans to customers primarily in Los Angeles, 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, 2014, loans secured by real estate collateral accounted for approximately 66% of the loan portfolio. Of these loans, 94% are secured by first trust deed liens and 6% are secured by second trust deed liens. In addition, 32% 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, 25% of total loans have been secured by a UCC filing on the business property of the borrower. Approximately 7% 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 requires the loans to be well collateralized and supported by cash flows.

	The following table is a breakout of the Company’s gross loans stratified by the industry concentration of the borrower by their respective NAICS code as of the dates indicated (dollars in thousands):


			December 31,
			2014			2013
	Real Estate		$	744,663		$	381,830
	Manufacturing			161,233			83,319
	Wholesale			124,336			60,291
	Construction			113,763			62,835
	Finance			96,074			46,393
	Hotel/Lodging			88,269			76,143
	Professional Services			64,215			49,739
	Other Services			45,781			21,448
	Healthcare			43,917			38,662
	Retail			35,503			23,157
	Administrative Management			28,016			15,218
	Restaurant/Food Service			24,525			35,244
	Transportation			18,158			9,531
	Information			15,457			11,709
	Education			10,253			10,270
	Entertainment			8,284			6,207
	Other			2,276			1,198

	Total		$	1,624,723		$	933,194

	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, 2014 was $107.4 million, of which $72.2 million has been sold. Of the $35.2 million remaining on the Company’s books, $24.1 million is not guaranteed and $11.1 million is guaranteed by the SBA.
	For SBA guaranteed loans, a secondary market exists to purchase the guaranteed portion of these loans with the Company continuing to “service” the entire loan. The secondary market for guaranteed loans is comprised of investors seeking long term assets with yields that adapt to the prevailing interest rates. These investors are typically financial institutions, insurance companies, pension funds, and other types of investors specializing in the acquisition of this product. When a decision to sell the guaranteed portion of an SBA loan is made by the Company, bids are solicited from secondary market investors and the loan is normally sold to the highest bidder.
	While there were no loans classified as held for sale at December 31, 2014, the Company has originated approximately $5.0 million in SBA 7a loans, of which $3.8 million is guaranteed by the SBA. The Company does not currently plan on selling these loans, but it may choose to do so in the future.
	Allowance for Loan Loss
The allowance for loan loss is a reserve 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 Company’s allowance for loan loss methodology includes allowance allocations calculated in accordance with ASC Topic 310, Receivables and allowance allocations calculated in accordance with ASC Topic 450, Contingencies. Accordingly, the methodology is based on historical loss experiences by type of credit, specific homogeneous risk pools, and specific loss allocations, with adjustments for current events and conditions. During the 4^th quarter of 2012, management enhanced its allowance methodology to expand the number of loan segments evaluated for historical losses and utilized peer historical loss data to evaluate potential loss exposure for those loan segments where the Company had no historical loss experience. There was no change in the quantitative effect on the portfolio segments. In loan segments where the Company has no historical loss experience, the loss experience of the Company’s peer banks, as reflected in the Uniform Bank Peer Report (“UPBR”) has been utilized. The Company’s process for determining the appropriate level of the allowance for loan loss is designed to account for credit deterioration as it occurs. The provision for loan losses reflects loan quality trends, including the levels of and trends related to non-accrual, past due, potential problem and criticized loans. Net charge-offs and recoveries, are also factored into the provision for loan losses. The provision for loan losses also reflects the totality of actions taken on all loans for a particular period. In other words, the amount of the provision reflects not only the necessary increases in the allowance for loan loss related to newly identified criticized loans, but it also reflects actions taken related to other loans including, among other things, any necessary increases or decreases in required allowance for specific loans or loan pools.
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,
		2014			2013			2012
Allowance for loan loss at beginning of year		$	10,603		$	8,803		$	7,495
Provision for loan losses			2,239			2,852			1,768
Net (charge-offs) recoveries:
Charge-offs			(692	)		(1,912	)		(687	)
Recoveries			460			860			227

Net (charge-offs) recoveries			(232	)		(1,052	)		(460	)

Allowance for loan loss at end of year		$	12,610		$	10,603		$	8,803

Net (charge-offs) recoveries to average loans			(0.02	)%		(0.12	)%		(0.08	)%
Allowance for loan loss to total loans			0.78	%		1.14	%		1.03	%
Allowance for loan loss to total loans accounted for at historical cost, which excludes purchased loans acquired by acquisition			1.39	%		1.5	%		1.54	%
The allowance for losses on unfunded loan commitments to extend credit is primarily related to commercial lines of credit and construction loans. The amount of unfunded loan commitments at December 31, 2014 and 2013 was $719.6 million and $345.9 million, respectively. The inherent risk associated with a loan is evaluated at the same time the credit is extended. However, the allowance held for the commitments is reported in other liabilities within the accompanying balance sheets and not as part of the allowance for loan loss in the above table. The allowance for the loss on unfunded loan commitments to extend credit was $471,000 and $329,000 at December 31, 2014 and 2013, respectively.

The following table presents, by loan portfolio segment, the changes in the allowance for loan loss for the dates and periods indicated (dollars in thousands):


		Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and			Estate
					Other Land
Year ended – December 31 2014
Allowance for loan loss – Beginning balance		$	5,534		$	1,120		$	3,886		$	63		$	10,603
Provision for loan losses			595			564			883			197			2,239
Net (charge-offs) recoveries:
Charge-offs			(619	)		—			(73	)		—			(692	)
Recoveries			354			—			106			—			460

Total net (charge-offs) recoveries			(265	)		—			33			—			(232	)

Ending balance		$	5,864		$	1,684		$	4,802		$	260		$	12,610



		Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and			Estate
					Other Land
Year ended – December 31 2013
Allowance for loan loss – Beginning balance		$	4,572		$	2,035		$	2,084		$	112		$	8,803
Provision for loan losses			2,596			(1,678	)		1,990			(56	)		2,852
Net (charge-offs) recoveries:
Charge-offs			(1,704	)		—			(200	)		(8	)		(1,912	)
Recoveries			70			763			12			15			860

Total net (charge-offs) recoveries			(1,634	)		763			(188	)		7			(1,052	)

Ending balance		$	5,534		$	1,120		$	3,886		$	63		$	10,603

The following table presents 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			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and			Estate
					Other Land
December 31, 2014
Allowance for loan loss:
Individually evaluated for impairment		$	222		$	—		$	—		$	—		$	222
Collectively evaluated for impairment			5,642			1,684			4,802			260			12,388
Purchased credit impaired (loans acquired with deteriorated credit quality)			—			—			—			—			—

Total Allowance for Loan Loss		$	5,864		$	1,684		$	4,802		$	260		$	12,610


Loans receivable:
Individually evaluated for impairment		$	1,914		$	—		$	737		$	—		$	2,651
Collectively evaluated for impairment			525,910			72,223			993,195			28,359			1,619,687
Purchased credit impaired (loans acquired with deteriorated credit quality)			693			—			1,692			—			2,385

Total Loans Receivable		$	528,517		$	72,223		$	995,624		$	28,359		$	1,624,723



		Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and			Estate
					Other Land
December 31, 2013
Allowance for loan loss:
Individually evaluated for impairment		$	4		$	—		$	—		$	—		$	4
Collectively evaluated for impairment			5,520			1,120			3,886			63			10,589
Purchased credit impaired (loans acquired with deteriorated credit quality)			10			—			—			—			10

Total Allowance for Loan Loss		$	5,534		$	1,120		$	3,886		$	63		$	10,603


Loans receivable:
Individually evaluated for impairment		$	2,640		$	—		$	3,680		$	—		$	6,320
Collectively evaluated for impairment			295,787			47,074			561,952			17,733			922,546
Purchased credit impaired (loans acquired with deteriorated credit quality)			1,046			—			3,282			—			4,328

Total Loans Receivable		$	299,473		$	47,074		$	568,914		$	17,733		$	933,194

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”. Individual loan risk ratings are updated continuously or at 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, 2014		Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and Other			Estate
					Land
Pass		$	502,624		$	72,223		$	977,525		$	28,358		$	1,580,730
Special Mention			8,738			—			4,878			—			13,616
Substandard			17,155			—			13,221			1			30,377
Doubtful			—			—			—			—			—

Total		$	528,517		$	72,223		$	995,624		$	28,359		$	1,624,723


December 31, 2013		Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and Other			Estate
					Land
Pass		$	289,594		$	47,074		$	547,600		$	17,731		$	901,999
Special Mention			1,540			—			2,613			—			4,153
Substandard			8,339			—			18,701			2			27,042
Doubtful			—			—			—			—			—

Total		$	299,473		$	47,074		$	568,914		$	17,733		$	933,194

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, 2014		31-60			61-90			Greater			Total			Total			Current		Total Loans
		Days			Days			than			Past Due			Non
		Past Due			Past Due			90 Days			and			Accrual
								Past Due			Accruing
								and
								Accruing
Commercial and Industrial		$	192		$	233		$	—		$	425		$	2,604		$	525,488	$	528,517
Construction, Land Development and Other Land			—			—			—			—			—			72,223		72,223
Commercial and Other Real Estate			354			—			—			354			1,305			993,965		995,624
Other			—			—			—			—			—			28,359		28,359

Total		$	546		$	233		$	0		$	779		$	3,909		$	1,620,035	$	1,624,723


December 31, 2013		31-60			61-90			Greater			Total			Total			Current		Total Loans
		Days			Days			than			Past Due			Non
		Past Due			Past Due			90 Days			and			Accrual
								Past Due			Accruing
								and
								Accruing
Commercial and Industrial		$	—		$	241		$	—		$	241		$	3,682		$	295,550	$	299,473
Construction, Land Development and Other Land			—			—			—			—			—			47,074		47,074
Commercial and Other Real Estate			—			—			—			—			5,874			563,040		568,914
Other			—			—			—			—			—			17,733		17,733

Total		$	—		$	241		$	—		$	241		$	9,556		$	923,397	$	933,194


Included in the non-accrual column above are purchased credit impaired loans of $1.3 million and $3.2 million as of December 31, 2014 and 2013, respectively. Included in the current column are purchased credit impaired loans that have been returned to accrual status of $1.1 million as of December 31, 2014 and 2013.
Impaired Loans
Impaired loans are evaluated by comparing the fair value of the collateral, if the loan is collateral dependent, and the present value of the expected future cash flows discounted at the loan’s effective interest rate, if the loan is not collateral dependent.
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 realizable 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, 2014 and 2013.
The following tables include 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). This table excludes purchased credit impaired loans (loans acquired in acquisitions with deteriorated credit quality) of $2.4 million and $4.3 million at December 31, 2014 and 2013, respectively.
Year ended December 31, 2014


		Recorded			Unpaid			Related			Average			Interest
		Investment			Principal			Allowance			Recorded			Income
					Balance						Investment			Recognized
With no specific allowance recorded:
Commercial and Industrial		$	520		$	609		$	—		$	869		$	—
Commercial and Other Real Estate			737			739			—			1,058			—
With an allowance recorded:
Commercial and Industrial			1,394			1,546			222			1,428			—
Total
Commercial and Industrial			1,914			2,155			222			2,297			—
Commercial and Other Real Estate			737			739			—			1,058			—

Total		$	2,651		$	2,894		$	222		$	3,355		$	—

Year ended December 31, 2013


		Recorded			Unpaid			Related			Average			Interest
		Investment			Principal			Allowance			Recorded			Income
					Balance						Investment			Recognized
With no specific allowance recorded:
Commercial and Industrial		$	2,540		$	5,347		$	—		$	1,835		$	—
Construction, Land Development and Other Land			—			—			—			879			—
Commercial and Other Real Estate			3,680			6,112			—			4,216			—
With an allowance recorded:
Commercial and Industrial			100			355			4			137			—
Total
Commercial and Industrial			2,640			5,702			4			1,972			—
Construction, Land Development and Other Land			—			—			—			879			—
Commercial and Other Real Estate			3,680			6,112			—			4,216			—

Total		$	6,320		$	11,814		$	4		$	7,067		$	—


The following is a summary of additional information pertaining to impaired loans for the periods indicated (dollars in thousands):


		Year Ended December 31,
		2014			2013
Average recorded investment in impaired loans		$	4,991		$	7,067
Interest foregone on impaired loans		$	421		$	710
Cash collections applied to reduce principal balance		$	3,014		$	5,057
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 interest rate, payment extensions, forgiveness of principal or other actions.
The modification process includes evaluation of impairment based on the present value of expected future cash flows, discounted at the contractual 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 TDR loans for the periods indicated (dollars in thousands). This table includes two TDR loans that were purchased credit impaired. As of December 31, 2014, these loans had a recorded investment of $204,000 and unpaid principal balances of $384,000.


Year ended December 31, 2014		Recorded			Unpaid			Interest
		Investment			Principal			Income
					Balance			Recognized
Commercial and Industrial		$	530		$	719		$	—
Commercial and Other Real Estate			114			115			—

Total		$	644		$	834		$	—

Year ended December 31, 2013
Commercial and Industrial		$	541		$	843		$	—
Commercial and Other Real Estate			2,173			2,785			—

Total		$	2,714		$	3,628		$	—


The following tables show the pre- and post-modification recorded investment in TDR loans by type of modification and loan segment that have occurred during the periods indicated (dollars in thousands):


Year ended December 31, 2014		Number			Pre-Modification			Post-
		of Loans			Recorded			Modification
					Investment			Recorded
								Investment
Reduced Interest Rate and Lengthened Amortization:
Commercial and Industrial			1		$	224		$	224
Commercial and Other Real Estate			1			114			114

Total			2		$	338		$	338

Year ended December 31, 2013
Reduced Interest Rate and Lengthened Amortization:
Commercial and Industrial			1		$	310		$	310
Commercial and Other Real Estate			—			—			—

Total			1		$	310		$	310

Loans are restructured in an effort to maximize collections. There was no financial impact for specific reserves or from charge-offs for the modified loans included in the table above. Impairment analyses are performed on the Company’s TDR loans in conjunction with the normal allowance for loan loss process. The Company’s TDR loans are analyzed to ensure adequate cash flow or collateral supports the outstanding loan balance.
There have been no payment defaults in 2014 subsequent to modification on TDR 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,
		2014			2013
Balance, beginning of year		$	7,912		$	12,189
Accretion, included in interest income			(3,023	)		(3,754	)
Additions, due to acquisition			16,562			—
Sold acquired loans			—			—
Reclassifications to non-accretable yield			(49	)		(523	)

Balance, end of year		$	21,402		$	7,912

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, 2014						December 31, 2013
		Unpaid			Carrying			Unpaid			Carrying
		Principal			Value			Principal			Value
		Balance						Balance
Commercial and Industrial		$	1,205		$	693		$	1,599		$	1,046
Commercial and Other Real Estate			3,018			1,692			5,611			3,282
Other			62			—			—			—

Total		$	4,285		$	2,385		$	7,210		$	4,328

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
		December 31,			December 31,
		2014			2013
Balance, beginning of year		$	395		$	9
Accretion, included in interest income			(71	)		(33	)
Reclassifications from non-accretable yield			—			419

Balance, end of year		$	324		$	395

Premises_and_Equipment_and_Lea

Premises and Equipment and Lease Commitments	12 Months Ended
Premises and Equipment and Lease Commitments	Dec. 31, 2014
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,
		2014			2013
	Furniture and equipment	$	8,489		$	5,252
	Leasehold improvements		7,009			6,730

	Total		15,498			11,982
	Less: Accumulated depreciation and amortization		(10,121	)		(8,451	)

	Total	$	5,377		$	3,531

	Total depreciation expense for the years ended December 31, 2014, 2013, and 2012 was $1.0 million, $1.1 million, and $1.0 million , respectively.

	The following is a schedule of future minimum lease payments for operating leases for office and branch space based upon obligations at December 31, 2014 (dollars in thousands):


	Year	Amount
	2015	$	3,186
	2016		3,034
	2017		2,981
	2018		2,162
	2019		2,006
	Thereafter		6,066

	Total	$	19,435

	Total rental expense on facilities for the years ended December 31, 2014, 2013 and 2012 was $2.2 million, $2.2 million , and $1.8 million, respectively.

Goodwill_Core_Deposit_and_Leas

Goodwill, Core Deposit and Leasehold Right Intangibles	12 Months Ended
Goodwill, Core Deposit and Leasehold Right Intangibles	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Core Deposit and Leasehold Right Intangibles	Note 8 – Goodwill, Core Deposit and Leasehold Right Intangibles
	Goodwill
	At December 31, 2014, the Company had goodwill of $64.0 million, of which $51.7 million was related to the 1^st Enterprise merger. See Note 2 – Business Combinations. The following table presents changes in the carrying value of goodwill for the periods indicated (dollars in thousands):


		Year Ended
		December 31,
		2014			2013
	Balance, beginning of year	$	12,292		$	12,292
	Goodwill acquired during the year		51,658			—
	Impairment losses		—			—

	Balance, end of year	$	63,950		$	12,292

	Accumulated impairment losses at end of year	$	—		$	—
	The Company’s goodwill was evaluated for impairment during the fourth quarter of 2014, with no impairment loss recognition considered necessary.

	Core Deposit Intangibles (“CDI”)
	The weighted average amortization period remaining for our core deposit intangibles is 7.2 years. The estimated aggregate amortization expense related to these intangible assets for each of the next five years is $1.7 million, $1.3 million, $1.1 million, $936,000, and $692,000. The Company’s core deposit intangibles were evaluated for impairment at December 31, 2014, 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,
		2014			2013			2012
	Gross amount of CDI:
	Balance, beginning of year	$	2,103		$	2,103		$	1,098
	Additions due to acquisitions		7,143			0			1,005

	Balance, end of year		9,246			2,103			2,103

	Accumulated Amortization:
	Balance, beginning of year		(665	)		(356	)		(137	)
	Amortization		(391	)		(309	)		(219	)

	Balance, end of year		(1,056	)		(665	)		(356	)

	Net CDI, end of year	$	8,190		$	1,438		$	1,747

	Leasehold Right Intangibles
	The leasehold right intangibles represent the difference between the fair value of the Company’s leases at acquisition and the contractual lease payments over the term of the leases. The Company recorded a leasehold right intangible of $390,000 related to the Los Angeles headquarter lease as part of the 1^st Enterprise merger. The recorded value of the Company’s leasehold right intangibles at December 31, 2014 was $1.4 million.
	The amortization of the leasehold right intangibles is recorded within the income statement under occupancy expense. The net amortization of the leasehold right intangible assets and liabilities resulted in expense of $142,000, income of $313,000 and $315,000 for the years ended December 31, 2014, 2013 and 2012, respectively.

Bank_Owned_Life_Insurance

Bank Owned Life Insurance	12 Months Ended
Bank Owned Life Insurance	Dec. 31, 2014
Investments, All Other Investments [Abstract]
Bank Owned Life Insurance	Note 9 – Bank Owned Life Insurance
	At December 31, 2014 and 2013 the Company had $38.7 million and $21.2 million, respectively of Bank-Owned Life Insurance (“BOLI”). The Company recorded non-interest income associated with the BOLI policies of $660,000, $617,000 and $267,000 for the years ending December 31, 2014, 2013 and 2012, respectively. The increase in the Company’s balance in 2014 by $17.5 million to $38.7 million was from the $16.9 million BOLI policies acquired from 1^st Enterprise and a $618,000 increase in the cash surrender value of the policies during 2014. The increase in the Company’s balance in 2013 by $617,000 to $21.2 million was from the increase in the cash surrender value of the policies during 2013.
	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, 2014, the $38.7 million was allocated between seven individual insurance companies, with balances ranging from approximately 1% to 32% 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_Organ

Investment in California Organized Investment Network ("COIN")	12 Months Ended
	Dec. 31, 2014
Investments Schedule [Abstract]
Investment in California Organized Investment Network ("COIN")	Note 10 – Investment in California Organized Investment Network (“COIN”)
	During 2013, the Company made investments of $1.1 million in 60 month term, 0% interest rate deposits. The Company made a $1.0 million investment with Rural Community Assistance Corporation (“RCAC”), that generated a $200,000 tax credit, and a $75,000 investment with Pacific Coast Regional Small Business Development Corporation (“PCR”) that generated a $15,000 tax credit. These investments qualified the Company for a $215,000 Qualified Investment Tax Credit that was applied to the Company’s 2013 and 2014 tax provision. During 2009, the Company made an investment in a $1.0 million, 60 month term, 0% interest rate deposit with Clearinghouse CDFI (“Clearinghouse”) that qualified the Company for a $200,000 Qualified Investment Tax Credit. Both investments made in 2013 and the one investment made in 2009 qualified as Community Redevelopment Act (“CRA”) investments under CRA investment guidelines.
	All three entities, the RCAC, the PCR and the Clearinghouse are certified Community Development Financial Institutions (“CDFI”) as defined and recognized by the United States Department of Treasury and are defined and recognized by the California Organized Investment Network (“COIN”) within the California Department of Insurance.
	Based on these investments being certified by the California Department of Insurance, the investments made in 2013 qualified for a 20% or $215,000 State of California income tax credit in the year made. 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. The deposit made in 2013 matures in 2018, while the deposit made in 2009 matured in 2014. These deposits are not insured by the FDIC, and are included in other assets on the 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.

Qualified_Affordable_Housing_P

Qualified Affordable Housing Project Investments	12 Months Ended
Qualified Affordable Housing Project Investments	Dec. 31, 2014
Federal Home Loan Banks [Abstract]
Qualified Affordable Housing Project Investments	Note 11 – Qualified Affordable Housing Project Investments
	The Company’s investment in Qualified Affordable Housing Projects that generate Low Income Housing Tax Credits at December 31, 2014 was $4.1 million with a recorded liability of $2.5 million in funding obligations. The Company has invested in three separate LIHTC projects which provide the Company with CRA credit. Additionally, the investment in LIHTC projects provides the Company with tax credits and with operating loss tax benefits over an approximately 10 year period. None of the original investment will be repaid. The tax credits and the operating loss tax benefits that are generated by each of the properties are expected to exceed the total value of the investment made by the Company and provide a return on the investment between 5.0% to 6.0%. The investment in LIHTC projects is being accounted for using the proportional amortization method, under which the Company amortizes the initial cost of the investment in proportion to the amount of the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit).
	See Note 1 – Summary of Significant Accounting Policies, “Qualified Affordable Housing Project Investments” regarding how the Company accounts for its investments in LIHTC projects.
	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, 2014 and 2013. In addition, the table reflects the tax credits and tax benefits recorded by the Company during 2014 and 2013, the amortization of the investment and the net impact to the Company’s income tax provision for 2014 and 2013. 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		Net Income
	December 31, 2014		Investment		Recorded		Liability		and Benefits (1)		Investments (2)		Tax Benefit
			Value		Investment		Obligation
	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


	Qualified Affordable Housing Projects at		Original		Current		Unfunded		Tax Credits		Amortization of		Net Income
	December 31, 2013		Investment		Recorded		Liability		and Benefits (1)		Investments (2)		Tax Benefit
			Value		Investment		Obligation
	Enterprise Green Communities West II LP		$	1,000	$	787	$	190	$	236	$	160	$	76
	Enterprise Housing Partners Calgreen II Fund LP			2,050		1,735		1,817		390		314		76
	Enterprise Housing Partners XXIV LP			2,000		1,988		1,983		14		11		3

	Total - Investments in Qualified Affordable Housing Projects		$	5,050	$	4,510	$	3,990	$	640	$	485	$	155


	-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 several years (dollars in thousands):


	Qualified Affordable Housing Projects		Enterprise		Enterprise		Enterprise		Total
			Green		Housing		Housing		Net Income Tax
			Communities		Partners		Partners XXIV		Benefit
			West II LP		Calgreen II		LP
					Fund LP
	Anticipated net income tax benefit less amortization of investments:
	2015		$	44	$	43	$	53	$	140
	2016			43		39		55		137
	2017 and thereafter			245		304		414		963

	Total – anticipated net income tax benefit in Qualified Affordable Housing Projects		$	332	$	386	$	522	$	1,240

Deposits

Deposits	12 Months Ended
Deposits	Dec. 31, 2014
Text Block [Abstract]
Deposits	Note 12 – Deposits
	At December 31, 2014, 84 customers maintained balances (aggregating all related accounts, including multiple business entities and personal funds of business principals) in excess of $4 million. The aggregate amount of such deposits amounted to $859.2 million or approximately 44% of the Company’s total customer deposit base. The depositors are not concentrated in any industry or business. At December 31, 2014 and 2013, the Company had “reciprocal” CDARS^® and ICS^® deposits that are classified as “brokered” deposits in regulatory reports. These “reciprocal” CDARS^® and ICS^® deposits are the only brokered deposits utilized by the Company, and the Company considers these deposits to be “core” in nature.

	At December 31, 2014, $62.9 million out of total time deposits of $64.8 million mature within one year.
	At December 31, 2014 and 2013, the Company had certificates of deposit with balances $100,000 or more of $60.7 million and $59.0 million, respectively, and certificates of deposits with balances $250,000 or more of $19.6 million and $20.5 million, respectively.
	The following table shows the maturity of the Company’s time deposits of $100,000 or more at December 31, 2014.


	Maturity of Time Deposits of $100,000 or More*
	(Dollars in thousands)
	Three months or less		$	10,376
	Over three through six months			16,476
	Over six through twelve months			32,278
	Over twelve months			1,605

	Total		$	60,735


	*	includes CDARS^® reciprocal time deposits of $100,000 or more. Total CDARS^® reciprocal time deposits included in the table above are $29.4 million.
	ICS^® Reciprocal Non-Interest Bearing Demand Deposits
	During 2013 the Company began participating as a member of the Insured Cash Sweep^® (“ICS^®”) deposit program. Through ICS^®, the Company may accept non-interest bearing deposits in excess of the FDIC insured maximum from a depositor and place the deposits through the ICS^® network into other member banks in increments of less than the FDIC insured maximum in order to provide the depositor full FDIC insurance coverage. The Company receives an equal dollar amount of deposits from other ICS^® member banks in exchange for the deposits the Company places into the ICS^® network. These deposits are recorded on the Company’s balance sheet as ICS^® reciprocal deposits. At December 31, 2014, the ICS^® reciprocal deposits totaled $12.4 million.
	CDARS^® Reciprocal Time Deposits
	The Company participates and is a member of the Certificate of Deposit Account Registry Service (CDARS^®) deposit product program. Through CDARS^®, the Company may accept deposits in excess of the FDIC insured maximum from a depositor and place the deposits through a network to other CDARS^® member banks in increments of less than the FDIC insured maximum to provide the depositor full FDIC insurance coverage. Where the Company receives an equal dollar amount of deposits from other CDARS^® member banks in exchange for the deposits the Company places into the network, the Company records these as CDARS^® reciprocal deposits. At December 31, 2014 and 2013, CDARS^® reciprocal deposits totaled $29.9 million and $28.9 million, respectively.

Borrowings_and_Subordinated_De

Borrowings and Subordinated Debentures

12 Months Ended

Dec. 31, 2014

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 one 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 market value of $32.3 million and $11.8 million were pledged to secure the Repos at December 31, 2014 and December 31, 2013, respectively. The Company segregates both the principal and accrued interest on these securities with the Company’s third party safekeeping custodians. All principal and interest payments on the investment securities that are pledged as collateral on the Repo program are received directly by the safekeeping custodian.

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, 2014

Date Issued

Amount

Interest Rate

Original

Maturity Date

Term

December 31, 2014

9,411

0.13% – 0.25%

2 days

January 2, 2015

Total

9,411

0.20%

December 31, 2013

Date Issued

Amount

Interest Rate

Original

Maturity Date

Term

3-Dec-13

750

0.10%

62 days

February 3, 2014

31-Dec-13

10,391

0.10% – 0.40%

2 days

January 2, 2014

Total

11,141

0.30%

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 $362.6 million, which represents approximately 25% of the Bank’s total assets, as reported by the Bank in its September 30, 2014 FFIEC Call Report.

As of December 31, 2014, the Company had $700 million of loan collateral pledged with the FHLB which provides $463 million in borrowing capacity. The Company has $23.3 million in investment securities pledged with the FHLB to support its credit facility. In addition, the Company must maintain an investment in the capital stock of the FHLB. The Company is required to purchase FHLB common stock to support its FHLB advances. Under the FHLB Act, the FHLB has a statutory lien on the FHLB capital stock that the Company owns and the FHLB capital stock serves as further collateral under the borrowing line.

The Company had no outstanding advances (borrowings) with the FHLB as of December 31, 2014 or 2013.

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 Company had no FHLB borrowings during 2014 or 2013, except for the annual testing of the borrowing lines. The Company is required to purchase FHLB common stock to support its FHLB advances. At December 31, 2014 and 2013, the Company had $8.0 million and $4.7 million of FHLB common stock, respectively. The current value of the FHLB common stock of $8.0 million would support FHLB advances up to $170.5 million. Any advances from the FHLB in excess of $170.5 million would require additional purchases of FHLB common stock.

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 resulted in the repurchase of the Company’s FHLB common stock during 2013 and 2012 by the FHLB. The FHLB repurchased $0, and $150,300 of the Company’s investment in FHLB capital stock during 2014 and 2013, respectively. The Company acquired FHLB capital stock of $3.8 million in 2014 from the acquisition of 1^st Enterprise.

The FHLB has paid or declared dividends on its capital stock for all four quarters of the years ending December 31, 2014, 2013 and 2012.

Subordinated Debentures

The following table summarizes the terms of each issuance of subordinated debentures outstanding as of December 31, 2014:

Series

Amount

Issuance

Maturity

Rate Index

Current

Next Reset

(in thousands)

Date

Rate

Date

Trust I

6,186

12/10/04

3/15/35

3 month LIBOR+2.05

2.291

3/17/15

Trust II

3,093

12/23/05

3/15/36

3 month LIBOR+1.75

1.991

3/17/15

Trust III

3,093

6/30/06

9/15/36

3 month LIBOR+1.85

2.091

3/17/15

Subtotal

12,372

Unamortized fair value adjustment

(2,834

)

Net

9,538

The Company had an aggregate outstanding contractual balance of $12.4 million in subordinated debentures at December 31, 2014. These 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 2014 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 $159,000 and $209,700 in amortization expense related to the fair value adjustment in 2014 and 2013, respectively. At December 31, 2014 the Company is estimating a remaining life of approximately 21 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 $159,000 related to the fair value adjustment on the subordinated debentures.

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 and leasehold right intangibles and a portion of the SBA servicing assets. See Note 22 – Regulatory Matters.

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.

Short-term Borrowings

Details regarding the Company’s short-term borrowings for the dates and periods indicated are reflected in the table below (dollars in thousands):

Year Ended December 31,

2014

2013

Balance

Average

Weighted

Balance

Average

Weighted

Balance

Average

Balance

Average

Rate

Securities sold under agreements to repurchase

9,411

13,579

0.25

11,141

24,376

0.3

The maximum amount of short-term borrowings outstanding at any month-end was $15.7 million and $30.0 million in 2014 and 2013, respectively.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
Derivative Financial Instruments	Dec. 31, 2014
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. At December 31, 2014, the Company has thirteen interest rate swap agreements with customers and thirteen 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 volatility 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.
	We believe our risk of loss associated with our counterparty borrowers related 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 our swaps is subject to market and counterparty risk. At December 31, 2014, the total notional amount of the Company’s swaps acquired from 1^st Enterprise was $35.7 million.
	Balance Sheet Classification of Derivative Financial Instruments Acquired from 1^st Enterprise Bank
	The following table presents the fair values of the asset and liability of the Company’s derivative instruments acquired from 1^st Enterprise as of December 31, 2014 (dollars in thousands):

			Asset Derivatives				Liability Derivatives
			December 31,				December 31,
			2014				2014
	Interest rate swap contracts fair value		$	719			$	719

	Balance sheet location			Accrued Interest				Accrued Interest
				Receivable and Other				Payable and Other
				Assets				Liabilities

	At December 31, 2014, the Company also has twenty two 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. At December 31, 2014, twenty-two of the original twenty-four interest rate swap contracts acquired from the PC Bancorp acquisition are outstanding.
	The Company, as part of its acquisition of PC Bancorp, had to formally document all relationships between the hedging instruments and the hedged items, as well as its risk management objective and strategy for re-designating the interest rate swap contract as a hedge transaction. This process included linking all derivatives that were designated as fair value hedges to specific assets on the balance sheet. The Company also formally assesses the hedge’s current effectiveness in offsetting changes in the fair values of the hedged items. On an ongoing basis, the derivatives that are used in hedging transactions are evaluated as to how effective they are in offsetting changes in fair values or cash flows of hedged items. At December 31, 2014, the twenty-two hedging relationships are determined to be effective.
	Prior to the merger with PC Bancorp, the Company did not utilize interest rate swaps to manage its interest rate risk position. All of the interest rate swap contracts acquired from PC Bancorp are with the same counterparty bank. The total notional amount of the outstanding swap contracts as of December 31, 2014 is $29.3 million. The outstanding swaps have original maturities of up to 15 years.
	Balance Sheet Classification of Derivative Financial Instruments Acquired from PC Bancorp
	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 and periods indicated (dollars in thousands):


			Liability Derivatives
			December 31,				December 31,
			2014				2013
	Fair Value Hedges
	Total interest rate contacts notional amount		$	29,289			$	31,914

	Derivatives not designated as hedging instruments:
	Interest rate swap contracts fair value		$	519			$	738
	Derivatives designated as hedging instruments:
	Interest rate swap contracts fair value			2,277				3,205

	Total interest rate contracts fair value		$	2,796			$	3,943

	Balance sheet location			Accrued Interest Payable				Accrued Interest Payable
	Balance sheet location			and Other Liabilities				and Other Liabilities

	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,
			2014				2013
	Derivatives not designated as hedging instruments:
	Interest rate swap contracts – loans
	Increase in fair value of interest rate swap contracts		$	219			$	306
	Payments on interest rate swap contracts on loans			(273	)			(289	)

	Net increase (decrease) in other non-interest income			(54	)			17

	Interest rate swap contracts – subordinated debenture
	Increase in fair value of interest rate swap contracts			—				70
	Payments on interest rate swap contracts on subordinated debentures			—				(70	)

	Net increase in other non-interest income			—				—

	Net increase (decrease) in other non-interest income		$	(54	)		$	17

	Derivatives designated as hedging instruments:
	Interest rate swap contracts – loans
	Increase in fair value of interest rate swap contracts		$	927			$	1,719
Increase (decrease) in fair value of hedged loans			315				(554	)
Payments on interest rate swap contracts on loans			(1,256	)			(1,294	)

Net (decrease) in interest income on loans		$	(14	)		$	(129	)

The interest rate swap contract originally associated with the subordinated debenture that was scheduled to mature in June 2013 was liquidated prior to maturity during the first quarter of 2013.
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, 2014, the Company had $1.1 million in investment securities, $2.7 million in certificates of deposit and $1.7 million in non-interest bearing balances for a total of $5.5 million with two counterparty banks. Of this amount, $4.1 million is pledged as collateral.

Balance_Sheet_Offsetting

Balance Sheet Offsetting	12 Months Ended
Balance Sheet Offsetting	Dec. 31, 2014
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 as permitted under accounting guidance. The Company’s interest rate swap derivatives that were acquired from PC Bancorp and 1^st Enterprise are subject to master bilateral netting and offsetting arrangements under specific conditions as defined within master agreements governing all interest rate swap contracts that the Company and the counterparty banks have entered into. In addition, the master agreements 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 as collateral, investment securities, a certificate of deposit and cash that is maintained in a due from bank account. 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 individual 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		Gross Amounts				Net Amount
		Amounts		Amounts		of Assets		Not Offset in the				(Collateral
		Recognized		Offset in the		Presented		Consolidated Balance Sheets				over liability
		in the		Consolidated		in the						balance
		Consolidated		Balance		Consolidated						required to
		Balance		Sheets		Balance						be pledged)
		Sheets				Sheets		Financial		Collateral
								Instruments		Pledged
	December 31, 2014
	Financial Assets:
	Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments)	$	719	$	—	$	719	$	719	$	—	$	—

	Total	$	719	$	—	$	719	$	719	$	—	$	—

	Financial Liabilities:
	Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments)	$	3,515	$	—	$	3,515	$	3,515	$	4,150	$	635
	Securities sold under agreements to repurchase		9,411		—		9,411		9,411		32,304		22,893

	Total	$	12,926	$	—	$	12,926	$	12,926	$	36,454	$	23,528


	December 31, 2013
	Financial Liabilities:
	Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments)	$	3,943	$	—	$	3,943	$	3,943	$	4,194	$	251
	Securities sold under agreements to repurchase		11,141		—		11,141		11,141		11,750		609

	Total	$	15,084	$	—	$	15,084	$	15,084	$	15,944	$	860

Stock_Options_and_Restricted_S

Stock Options and Restricted Stock	12 Months Ended
Stock Options and Restricted Stock	Dec. 31, 2014
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.
	Upon the adoption of the Equity Plan, the Company concurrently terminated both its earlier 2005 equity compensation plans. All the remaining unissued shares of common stock under both 2005 equity compensation plans were rolled into the 2007 Equity and Incentive Plan. No further shares were issued under these older plans. All option shares issued under the existing plans remain in force until the shares are either exercised, expire or are cancelled.
	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 $11.1 million at the merger date.
	Under the Equity Plan, there are a total of 1,490,547 shares authorized. A total of 855,083 shares have been issued out of the plan, with 64,041 of these issued shares subsequently cancelled and returned back into the plan, leaving 699,505 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.
	During 2014, the Company had a combined federal and state tax benefit of $582,000, related to the vesting of restricted stock and the exercise of stock options during 2014, of which $233,000 was related to restricted stock and $349,000 was related to stock options. This tax benefit was recorded to additional paid in capital during the year ending December 31, 2014.
	During 2013, the Company had a combined federal and state tax benefit of $659,000, related to the vesting of restricted stock and the exercise of stock options during 2013, of which $96,000 was related to restricted stock and $563,000 was related to stock options. This tax benefit was recorded to additional paid in capital during the year ending December 31, 2013.

	During 2012, the Company had a combined federal and state tax deficiency of $57,000, related to the vesting of restricted stock during 2012, of which $53,000 was recorded as additional tax expense and $4,000 was recorded to additional paid in capital. There were no tax benefits or deficiencies related to the exercise or cancellation of stock options during 2012.
	At December 31, 2014, future compensation expense related to non-vested stock option and restricted stock grants aggregated to the amounts reflected in the table below (dollars in thousands):


	Future Stock Based Compensation Expense	Stock				Restricted		Total
	Future Stock Based Compensation Expense	Options				Stock		Total
	2015	$	2			$	1,946	$	1,948
	2016		—				1,034		1,034
	2017		—				323		323
	2018		—				93		93
	Thereafter		—				—		—

	Total	$	2			$	3,396	$	3,398

	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 2012, 2013 or 2014. 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 – The risk-free rate for periods within the contractual life of the option have been based on the U.S. Treasury rate that matures on the expected assigned life of the option at the date of the grant.
	Expected Life of Options – The expected life of options have either been calculated using a formula from the Securities and Exchange Commission “SEC” for companies that do not have sufficient historical data to calculate the expected life, or from the estimated life of options granted by the Company. The formula from the SEC calculation of expected life is specifically based on the following: the expected life of the option is equal to the average of the contractual life and the vesting period of each option.
	Expected Volatility –Beginning in 2009, the expected volatility has been based on the historical volatility for the Company’s shares.
	Dividend Yield – The dividend yield has been based on historical experience and expected future changes on dividend payouts. The Company has not declared or paid dividends on its common stock in the past and does not expect to declare or pay dividends on its common stock within the foreseeable future.

	Stock Options
	There were no stock options granted by the Company in 2012, 2013 or 2014.
	The following table summarizes the stock option activity under the plans for the year ended December 31, 2014:


		Shares				Weighted		Weighted		Aggregate
						Average		Average		Intrinsic
						Exercise		Remaining		Value
						Price		Contractual		(in thousands)
								Term
								(in years)
	Outstanding stock options at December 31, 2013		434,740			$	13.89		2.1	$	1,913
	Adoption of 1^ST Enterprise 2006 Stock Incentive Plan		802,766			$	7.84		1.6	$	11,121
	Granted		—
	Exercised		(221,016	)
	Forfeited		—
	Expired		—

	Outstanding stock options at December 31, 2014		1,016,490			$	10.13		1.6	$	11,770

	Exercisable options at December 31, 2014		1,010,290			$	10.12		1.6	$	11,711
	Unvested options at December 31, 2014		6,200			$	12.2		2.3	$	59
	Outstanding, vested and expected to vest at December 31, 2014		1,016,490			$	10.13		1.6	$	11,770
	The Company recorded stock option expense of $10,000, $21,000 and $54,000, for the years ended December 31, 2014, 2013, and 2012, respectively.
	During 2013, four executive officers of the Company elected and adopted to exercise outstanding stock options under Rule 10b5-1(c)(1) “10b5 Plans” under the Securities Exchange Act of 1934, as amended. Under the 10b5 Plans, the officers elected to sell a portion or all of their outstanding nonqualified and incentive stock options that expire though May of 2015. A total of 320,764 stock options were made subject to the 10b5 Plans. Of the total 221,016 options that were exercised in 2014, 88,344 options were exercised under the 10b5 Plans. As of December 31, 2014, there were no further options remaining under the 10b5 Plans to be exercised or sold.
	The total intrinsic value of options exercised during the years ended December 31, 2014 and 2013 was $2.1 million and $2.3 million, respectively. No options were exercised in 2012.
	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, 2014:


		Number				Weighted-Average
		of Shares				Grant-Date Fair
		Value per Share
Restricted Stock:
Unvested, at December 31, 2013		266,050			$	13.49
Granted		172,900				19.39
Vested		(124,428	)			13.75
Cancelled and forfeited		(5,016	)			14.88

Unvested, at December 31, 2014		309,506			$	16.66


Compensation expense of $1.7 million, $1.1 million, and $1.1 million was recorded related to the above restricted stock grants for the years ended December 31, 2014, 2013 and 2012, respectively. Restricted stock awards 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 aggregate fair value at the date of vesting of the 124,428 shares of restricted stock that vested in 2014 was $2.3 million.

Supplemental_Executive_and_Dir

Supplemental Executive and Director Retirement Plans	12 Months Ended
Supplemental Executive and Director Retirement Plans	Dec. 31, 2014
Postemployment Benefits [Abstract]
Supplemental Executive and Director Retirement Plans	Note 17 – Supplemental Executive and Director Retirement Plans
	Supplemental Executive Retirement Plan
	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, 2014 and 2013, the SERP plan had accrued liabilities of $3.2 million and $2.6 million, respectively.
	As a result of its acquisition of 1^st Enterprise in 2014, the Company acquired a deferred compensation plan with a liability balance of $622,000 at December 31, 2014. 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 and 100% vested for the amount of their deferral account.
	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, 2014, the accrued liability of the PC Bancorp Supplemental Employee Salary Plan was $1.6 million, and the accrued liability of the Deferred Director Fee Plan was $313,000. The Company recorded a total of $705,000, $661,000 and $217,000 in deferred salary compensation expense for the years ended December 31, 2014, 2013 and 2012, respectively, related to the deferred compensation plans.
	Split Dollar Employee Insurance Plan
	The Company’s accrued liability for the Split Dollar Employee Insurance Plan was $1.2 and $1.1 million at December 31, 2014 and 2013, respectively. The Company recorded split dollar life insurance expense of $38,000, $36,000, $47,000 in 2014, 2013 and 2012 respectively, related to the split dollar policies.

Defined_Contribution_Plan_401k

Defined Contribution Plan 401(k)	12 Months Ended
Defined Contribution Plan 401(k)	Dec. 31, 2014
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 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. Effective as of January 1, 2013, the Company changed from a safe harbor election for employer contributions to an “employer match” type of contribution for the benefit of the employees covered under the plan. During 2012, the Company made “safe harbor” non-elective employer contributions, to all employees eligible under the plan. Under the employer match type of contribution that began in January of 2013, the Company has matched $0.50 on the dollar for every dollar the employee contributed to the plan, up to maximum of 4% of the employee’s eligible compensation. The dollar amount an individual employee may contribute to his plan has regulatory limits.

	For 2012, the Company elected to make “safe harbor” or Guaranteed Company Contribution of 3% of salary to all employees. Safe harbor contributions are immediately vested. The decision to make a Guaranteed Company Contribution is made by the Company on an annual basis.
	The Company’s expense relating to the contributions made to the 401(k) plan for the benefit of its employees was $418,000, $431,000 and $383,000 for the years ended December 31, 2014, 2013, and 2012, respectively.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Note 19 - Income Taxes
	The Company’s income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis plus Federal and California net operating losses and credits. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be realized, recovered and or settled. The effect on the deferred tax assets and liabilities of a 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 considers the future realization of these deferred tax assets more likely than not.
	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, 2014, 2013, and 2012. Interest and penalties related to uncertain tax positions are recorded as part of other operating expense.
	Income tax expense (benefit) consists of the following (dollars in thousands):


			Year Ended December 31,
			2014				2013				2012
	Current provision
	Federal		$	4,517			$	1,669			$	2,497
	State			1,183				238				265

	Total current provision			5,700				1,907				2,762
	Deferred provision (benefit)
	Federal			382				2,674				(917	)
	State			350				427				(180	)

	Total deferred provision (benefit)			732				3,101				(1,097	)

	Total current and deferred provision		$	6,432			$	5,008			$	1,665


	The following is a summary of the components of the net deferred tax asset recognized in the accompanying balance sheets as of the dates indicated (dollars in thousands):


			December 31,
			2014				2013
	Deferred Tax Assets
	Federal tax operating loss carryforward		$	99			$	317
	State tax operating loss carryforward			162				168
	Allowance for loan loss			5,823				4,726
	Purchase accounting and loan fair value adjustments			9,430				5,558
	Accruals and other liabilities			1,457				1,570
	Stock compensation and deferred compensation costs			6,703				3,145
	Net unrealized loss on securities available-for-sale			—				143
	Start up, organizational and other costs			612				255

	Total deferred tax assets			24,286				15,882

	Deferred Tax Liabilities
	Net unrealized gain on securities available-for-sale			(138	)			—
	State tax liability			(1,041	)			(1,270	)
	Unamortized fair value on subordinated debentures			(1,310	)			(1,402	)
	Core deposit intangibles			(3,754	)			(478	)
	Prepaid expense and other			(1,524	)			(815	)

	Total deferred tax liabilities			(7,767	)			(3,965	)

	Valuation allowance			(15	)			(82	)

	Deferred tax assets, net		$	16,504			$	11,835

	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).
	The largest component of the combined net federal and state deferred tax assets consist of the fair value purchase accounting adjustment related to loans acquired in the mergers. The remaining deferred tax asset from the fair value purchase accounting adjustment on loans was $9.7 million at December 31, 2014 and $4.3 million at December 31, 2013.
	The Company has federal net operating loss carryforwards attributable to the COSB acquisition of $282,000 and $906,000 and state net operating loss carryforwards of $165,000 and $789,000 at December 31, 2014, and 2013, respectively. The decrease in both the federal and state net operating loss carryforwards was attributable to the Company being able to utilize $624,000 in both federal and state net operating loss carryforwards in the 2014 tax provision. The federal and state net operating loss carryforwards from the COSB acquisition are subject to an annual limitation of $624,000 due to the ownership change on December 31, 2010. These net operating losses expire in 2030.
	In addition, the Company has a state tax capital loss carryforward acquired from the PC Bancorp acquisition of $54,000 at December 31, 2014 and $761,000 at December 31, 2013, and $707,000 of the $761,000 of capital loss carryforward at December 31, 2013 expired during 2014 and the remaining expires in 2016.
	The Company has a $1.3 million state net operating loss carryforward at CU Bancorp that arose from CU Bancorps’s 2012 unconsolidated 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. The Company was able to utilize an additional $1.3 million of federal net operating losses and $7,000 of state net operating losses during 2013 that arose from CU Bancorp’s unconsolidated 2012 operating loss. These net operating losses expire in 2032. Between the utilization of the COSB net operating loss carryforwards and the CU Bancorp previously unconsolidated net operating loss carryforwards, the Company was able to effectively utilize approximately $624,000 federal and state net operating losses in 2014 and approximately $1.9 million in net federal and $631,000 state operating loss carryforwards during 2013.
	Due to the uncertainty surrounding the ability to fully utilize certain California deferred tax assets, a valuation allowance has been established.
	The Company’s investments in Qualified Affordable Housing Projects generated low income housing tax credits and benefits net of investment amortization of $119,000 and $155,000 in 2014 and 2013, respectively. See Note 11- Investments in Qualified Affordable Housing Projects for a discussion on the investments.
	The Company recorded an excess tax benefit related to the vesting of its restricted stock, the exercise of non-qualifying stock options and the recording of disqualifying dispositions following the exercises of incentive stock options in 2014 and in 2013. The federal and state excess tax benefits associated with the vesting of restricted stock was $232,000 and $96,000 during 2014 and 2013, respectively and was recorded to APIC. The federal and state excess tax benefit associated with exercise of non-qualified stock options was $287,000 and $359,000 during 2014 and 2013, respectively, and was recorded to APIC. The federal and state tax benefit associated with the disqualifying disposition of incentive stock options exercised in 2014 was $63,000 and in 2013 was $355,000. In 2014, $63,000 of the tax benefit associated with the disqualifying disposition of incentive stock options was recorded to APIC and $64,000 was recorded as a benefit to income tax expense. In 2013, $204,000 of the tax benefit associated with the disqualifying disposition of incentive stock options was recorded to APIC and $151,000 was recorded as a benefit to income tax expense. The total excess tax benefits recorded to APIC related to restricted stock and stock options was $582,000 and $659,000 during 2014 and 2013, respectively.
	Included in the 2013 tax provision for the year ended December 31, 2013 was a tax benefit of $326,000 related to the re-valuing of the Company’s deferred tax assets and liabilities using a federal statutory rate of 34% in 2012 to 35% in 2013. This 1% change in the federal statutory rate positively impacted the 2013 provision by $326,000. The increase in the statutory rate is due to increased profitability which causes the federal tax rate to move to the maximum bracket of 35% versus the 34% bracket utilized in prior years.
	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,
		2014								2013							2012
		Amount				Percent				Amount				Percent			Amount			Percent
Federal income tax expense at statutory rate		$	5,369				35	%		$	5,178				35	%	$	1,187			35	%
State franchise taxes, net of federal benefit, excluding LIHTC investments			1,209				7.88				524				3.54			315			9.29
Effect of rate change on net deferred tax asset			—				—				(326	)			(2.20	)		—			—
Release of state valuation allowance on use of net operating loss			(68	)			(0.44	)			(68	)			(0.46	)		(150	)		(4.43	)
Meals and entertainment, dues and other non-deductible items			75				0.49				54				0.37			47			1.39
Cash surrender life insurance			(231	)			(1.51	)			(210	)			(1.42	)		(91	)		(2.68	)
Stock compensation expense			(53	)			(0.35	)			(126	)			(0.85	)		39			1.15
LIHTC investments			(119	)			(0.77	)			(155	)			(1.05	)		0			0
Merger costs			515				3.36				5				0.03			300			8.84
Other			(265	)			1.73				132				0.89			18			0.53

		$	6,432				41.93	%		$	5,008				33.85	%	$	1,665			49.09	%


The Company’s federal income tax returns for the years ended December 31, 2011 through 2013 are open for examination by federal taxing authorities and the Company’s state income tax returns for the years ended December 2010 through 2013 are open for examination by state taxing authorities. The Company is undergoing an examination of its federal tax returns for the year ended December 31, 2012. At year-end, the examination was close to conclusion with one adjustment which will not result in additional income tax expense.
The Company is undergoing an examination by the California Franchise Tax Board of the Enterprise Zone net interest deduction that the Company took in its California 2011 and 2012 tax returns. The Franchise Tax Board has requested and the Company has supplied information related to the composition and calculation of the net interest deduction taken by the Company in 2011 and 2012. The Franchise Tax board has not yet notified the Company of their findings.
The Company was notified during 2014 of an examination of the 2010 and 2011 California tax return of Premier Commercial Bancorp by the California Franchise Tax Board. The California Franchise Tax Board has requested support for the calculation of the bad debt deduction and the California Enterprise Zone net interest deduction. The Company is in the process of providing this information.
The Company has not been notified of any other pending tax examinations by taxing authorities.
The consolidated effective tax rate reflected within these financial statements is dependent on the composition of taxable earnings in the period. A number of expenses such as certain merger related expenses, certain business and entertainment expenses, country club dues, etc. are not allowable as an expense for either federal or state purposes and are classified as permanent differences. In addition, the Company has several items included in income, that are excluded from taxable income, such as interest on municipal bonds, interest on loans to municipalities, increases in the cash surrender value of life insurance policies, and for state tax purposes through 2013, the net interest income on loans within the State of California Enterprise Zone designated areas. Because of these differences, the Company’s effective tax may vary considerably between reporting years. During 2012 and 2014, due to the inclusion of significant nondeductible merger related costs, the Company had an effective tax rate in excess of its statutory rate. In 2013, the Company invested $1.1 million in Community Redevelopment Act “CRA” 60 month term, 0% interest rate deposits that made the Company eligible for a $215,000 Qualified Investment Tax Credit, which was received in the third quarter of 2013. The Company has invested in LIHTCs that generate tax credits and benefits for the Company. See Note 1 and Note 11 – Investments in Qualified Affordable Housing Projects. The Company’s consolidated effective tax rate was 41.93%, 33.85% and 49.09% for the year ended December 31, 2014, 2013 and 2012, respectively.
Based on legislation enacted during the second quarter of 2013, the California State Legislature has repealed the net interest deduction on interest income for loans within the designated State of California Enterprise Zones. The effective date of this legislation is January 1, 2014. As a result, the Company is no longer eligible for the net interest deduction when calculating its state income tax provision which increased the effective state tax rate for 2014.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2014
Equity [Abstract]
Shareholders' Equity	Note 20 - Shareholders’ Equity
	Common Stock
	The Company’s outstanding common stock increased by 5,602,492 shares, from 11,081,364 shares at December 31, 2013 to 16,683,856 at December 31, 2014. As discussed in Note 2, Business Combinations, the Company completed the merger with 1^st Enterprise on November 30, 2014. Pursuant to the terms and conditions set forth in the Merger Agreement, each outstanding share of 1^st Enterprise common stock was converted into the right to receive 1.3450 of a share of CU Bancorp
	common stock, resulting in 5,240,409 shares of CU Bancorp common stock issued. The fair value of the CU Bancorp common stock issued as part of the consideration paid was $102.7 million and was determined based on the closing market price of $19.60 of CU Bancorp common stock on November 30, 2014. During 2014, the Company issued 221,016 shares of stock from the exercise of employee stock options for a total value of $2.0 million. The Company also issued 172,900 shares of restricted stock to the Company’s directors and employees, cancelled 5,016 shares of unvested restricted stock related to employee turnover and cancelled 26,317 shares of restricted stock that had a value of $471,000, when employees elected to pay their tax obligation via the repurchase of the stock by the Company. The net issuance of restricted stock for 2014 was 167,884 shares. See Note 16 – Stock Options and Restricted Stock under “Equity Compensation Plans” for a more detailed analysis related to the issuances of these shares.
	During 2013, the Company issued 282,031 shares of stock from the exercise of employee stock options for a total value of $2.8 million. In addition, the Company issued 81,050 shares of restricted stock to the Company’s directors and employees, cancelled 11,600 shares of unvested restricted stock related to employee turnover and cancelled 28,791 shares of restricted stock that had a value of $422,000, when employees elected to pay their tax obligation via the repurchase of the stock by the Company. The net issuance of restricted stock for 2013 was 69,450 shares.
	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.
	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 Treasury was converted into substantially 16,400 identical shares with identical terms. CU Bancorp Preferred Stock has a liquidation preference amount of $1,000 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 fair value of CU Bancorp Preferred Stock was $15.9 million at the merger date. Dividends on the CU Bancorp Preferred Stock are paid to the U.S. Department of the Treasury on a quarterly basis. See Note 22, Regulatory Matters, for restrictions on dividends.
	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):


		Before			Tax			Net of
		Tax			Effect			Tax
	Year ended December 31, 2014
	Net unrealized gains (losses) on investment securities:
	Beginning balance	$	(348	)	$	143		$	(205	)

	Non-credit portion of other-than-temporary impairments arising during the period		—			—			—
	Net unrealized gain (losses) arising during the period		681			(286	)		395

	Net other comprehensive loss		681			(286	)		395

	Ending balance	$	333		$	(143	)	$	190



		Before			Tax			Net of
		Tax			Effect			Tax
	Year ended December 31, 2013
	Net unrealized gains (losses) on investment securities:
	Beginning balance	$	2,369		$	(975	)	$	1,394

	Non-credit portion of other-than-temporary impairments arising during the period		(41	)		17			(24	)
	Net unrealized losses arising during the period		(2,629	)		1,082			(1,547	)

	Other comprehensive loss before reclassification		(2,670	)		1,099			(1,571	)
	Reclassification adjustment for gains realized in net income		(47	)		19			(28	)

	Net other comprehensive loss		(2,717	)		1,118			(1,599	)

	Ending balance	$	(348	)	$	143		$	(205	)

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 21 - Commitments and Contingencies
	The Company follows accounting guidance related to “Accounting for Contingencies” which provides criteria for determining whether a company must accrue or disclosure a loss contingency. Under these guidelines, a loss contingency is defined as “an existing condition, situation, or set of circumstances involving uncertainty to an enterprise that will ultimately be resolved when one or more future events occur or fail to occur. A potential loss resulting from pending litigation is to be accrued when it is probable that one or more future events will occur confirming the fact of the loss and when “the amount of the loss can be reasonably estimated.” If an enterprise determines that one or both of these conditions have not been met, accounting guidance requires an enterprise to disclose a loss contingency when “there is at least a reasonable possibility that a loss may have occurred.” This disclosure “shall give an estimate of the possible loss or range of losses or state that such an estimate cannot be made.” Neither accrual nor disclosure is required when the probability of the future events occurring that would trigger the loss for the enterprise is considered to be remote.
	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, 2014, 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.
	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 $720 million and $346 million at December 31, 2014 and 2013, respectively. Included in the aforementioned commitments were standby letters of credit outstanding of $57.2 million and $40.6 million at December 31, 2014 and 2013, respectively. As of December 31, 2014 and 2013, the Company had established an allowance for unfunded loan commitments of $471,000 and $329,000, respectively. These balances are included in other liabilities on the balance sheet.

Regulatory_Matters

Regulatory Matters	12 Months Ended
Regulatory Matters	Dec. 31, 2014
Text Block [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 Risked-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.
	As of December 31, 2014, the Company and the Bank are categorized as well-capitalized under the regulatory framework for Prompt Corrective Action. To be categorized as well-capitalized the Company and Bank must maintain minimum Total risk-based capital, Tier 1 risk-based capital and Tier 1 leverage ratios, as set forth in the following table.
	Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts (as set forth in the table below) of Total capital and Tier 1 capital (as defined in the regulations) and ratios of Total capital and Tier 1 capital to risk-weighted assets (as defined) and to average assets (as defined).

	The following tables present the Total Risk-Based Capital Ratio, Tier 1 Risk-Based Capital Ratio and the Tier 1 Leverage Ratio of the Consolidated Company in addition to the Bank as of December 31, 2014, and December 31, 2013, and compare the actual ratios to the capital requirements imposed by government regulations. All amounts reflected in the table below are stated in thousands, except percentages:
	CU Bancorp Consolidated:


		Actual					For Capital Adequacy					To Be Well-
							Purposes					Capitalized Under
												Prompt Corrective
												Provisions
		Amount		Ratio			Amount		Ratio			Amount		Ratio
	As of December 31, 2014
	Total Risk-Based Capital Ratio	$	231,228		11.61	%	$	159,363		8	%	$	199,204		10	%
	Tier 1 Risk-Based Capital Ratio		218,147		10.95	%		79,682		4	%		119,523		6	%
	Tier 1 Leverage Ratio		218,147		12.92	%		67,564		4	%		84,455		5	%
	As of December 31, 2013
	Total Risk-Based Capital Ratio	$	145,372		12.8	%	$	90,844		8	%	$	113,555		10	%
	Tier 1 Risk-Based Capital Ratio		134,440		11.84	%		45,422		4	%		68,133		6	%
	Tier 1 Leverage Ratio		134,440		9.57	%		56,172		4	%		70,215		5	%
	California United Bank:


		Actual					For Capital Adequacy					To Be Well-
							Purposes					Capitalized Under
												Prompt Corrective
												Provisions
		Amount		Ratio			Amount		Ratio			Amount		Ratio
	As of December 31, 2014
	Total Risk-Based Capital Ratio	$	223,112		11.2	%	$	159,300		8	%	$	199,125		10	%
	Tier 1 Risk-Based Capital Ratio		210,031		10.55	%		79,650		4	%		119,475		6	%
	Tier 1 Leverage Ratio		210,031		12.44	%		67,532		4	%		84,415		5	%
	As of December 31, 2013
	Total Risk-Based Capital Ratio	$	135,682		11.96	%	$	90,772		8	%	$	113,465		10	%
	Tier 1 Risk-Based Capital Ratio		124,750		10.99	%		45,386		4	%		68,079		6	%
	Tier 1 Leverage Ratio		124,750		8.9	%		56,082		4	%		70,102		5	%
	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 2014, the Board approved a quarterly dividend payment on the preferred shares of $41,000 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.

Fair_Value_Information

Fair Value Information	12 Months Ended
Fair Value Information	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Information	Note 23 - Fair Value Information
	Fair Value Measurement
	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. ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including both those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis and a non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value, and for estimating the fair value of financial assets and financial liabilities not recorded at fair value, are discussed below.
	In accordance with accounting guidance, 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 own assumptions 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. The following is a description of both the general and specific valuation methodologies used for certain instruments measured at fair value, as well as the general classification of these instruments pursuant to the valuation hierarchy.
	Investment Securities Available-for-Sale: The fair value of securities available-for-sale may be determined by obtaining quoted prices in active markets, when available, from nationally recognized securities exchanges (Level 1 financial assets) If quoted market prices are not available, the fair value is determined by a matrix pricing, which is a mathematical technique widely used in the securities industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities which are observable market inputs (Level 2 financial assets). Debt securities’ pricing is generally obtained from one of the matrix pricing models developed from one of the three national pricing agencies. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3 financial assets.
	Securities classified as available-for-sale are accounted for at their current fair value rather than amortized historical cost. Unrealized gains or losses are excluded from net income and reported as an amount net of taxes as a separate component of accumulated other comprehensive income included in shareholders’ equity.
	The Company considers the inputs utilized to fair value the U.S. Agency and U.S. Sponsored Agency issued debt securities (callable and non-callable notes), mortgage backed securities guaranteed by those agencies, collateralized mortgage obligations issued by those agencies, corporate bond securities, and municipal securities to be observable market inputs and classified these financial assets within the Level 2 fair value hierarchy. Management bases the fair value for these investments primarily on third party price indications provided by independent pricing sources utilized by the Company’s bond accounting system to obtain market pricing on its individual securities. Vining Sparks, who provides the Company with its bond accounting system, utilizes pricing from three independent third party pricing sources for pricing of securities. These third party pricing sources utilize, quoted market prices or when quoted market prices are not available, then fair values are estimated using nationally recognized third-party vendor pricing models of which the inputs are observable. However, the fair value reported may not be indicative of the amounts that could be realized in an actual market exchange.
	The fair value of the Company’s U.S. Agency and U.S. Sponsored Agency callable and non-callable agency securities, mortgage backed securities guaranteed by those agencies, and collateralized mortgage obligations issued by those agencies, corporate bond securities, and municipal securities are calculated using an option adjusted spread model from one of the nationally recognized third-party pricing models. Depending on the assumptions used and the treasury yield curve and other interest rate assumptions, the fair value could vary significantly in the near term.
	Loans: The fair value for loans is estimated by discounting the expected future cash flows using current interest rates at which similar loans would be made to borrowers with similar credit ratings for the same remaining maturities, adjusted for the allowance for loan loss. Loans are segregated by type such as commercial and industrial, commercial real estate, construction and other loans with similar credit characteristics and are further segmented into fixed and variable interest rate loan categories. Expected future cash flows are projected based on contractual cash flows, adjusted for estimated prepayments. The inputs utilized in determining the fair value of loans are unobservable and accordingly, these financial assets are classified within Level 3 of the fair value hierarchy.
	Impaired Loans: The fair value of impaired loans is determined based on an evaluation at the time the loan is originally identified as impaired, and periodically thereafter, at the lower of cost or fair value. Fair value on impaired loans is measured based on the value of the collateral securing these loans, less costs to sell, if the loan is collateral dependent, or based on the discounted cash flows for non collateral dependent loans. Collateral on collateral dependent loans may be real estate and/or business assets including equipment, inventory and/or accounts receivable and is determined based on appraisals performed by qualified licensed appraisers hired by the Company. Appraised and reported values may be discounted based on management’s historical knowledge, changes in market conditions from the time of valuation, and/or management’s expertise and knowledge of the client and client’s business. Such discounts are typically significant and unobservable. For unsecured loans, the estimated future discounted cash flows of the business or borrower, are used in evaluating the fair value. Impaired loans are reviewed and evaluated on at least a quarterly basis for additional impairment and adjusted accordingly, based on the same factors identified above. The inputs utilized in determining the fair value of impaired loans are unobservable and accordingly, these financial assets are classified within Level 3 of the fair value hierarchy.
	Interest Rate Swap Contracts: Interest Rate Swap Contracts: The fair value of the interest rate swap contracts are provided by an independent third party vendor that specializes in interest rate risk management and fair value analysis using a model that utilizes current market data to estimate cash flows of the interest rate swaps utilizing the future London Interbank Offered Rate (“LIBOR”) yield curve for accruing and the future Overnight Index Swap Rate (“OIS”) yield curve for discounting through the maturity date of the interest rate swap contract. The future LIBOR yield curve is the primary input in the valuation of the interest rate swap contracts. Both the LIBOR and OIS yield curves are readily observable in the marketplace. Accordingly, the interest rate swap contracts are classified within Level 2 of the fair value hierarchy.
	Other Real Estate Owned: The fair value of other real estate owned is generally based on real estate appraisals (unless more current market information is available) less estimated costs to sell. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are typically significant. The inputs utilized in determining the fair value of other real estate owned are unobservable and accordingly, these financial assets are classified within Level 3 of the fair value hierarchy.
	SBA Servicing Asset: The Company acquired an SBA servicing asset with the PC Bancorp merger and has added to the servicing asset with the sale of SBA loans subsequent to the merger. This servicing asset was initially fair valued at the merger date based on an evaluation by a third party who specializes in fair value analysis. The fair value of this asset was based on the estimated discounted future cash flows utilizing market based discount rates and estimated prepayment speeds. The discount rate was based on the current U.S. Treasury yield curve, plus a spread for marketplace risk associated with these assets. Prepayment speeds were selected based on the historical prepayments of similar SBA pools. The prepayment speeds determine the timing of the cash flows. The SBA servicing asset is amortized over the estimated life of the loans based on an effective yield approach. In addition, the Company’s servicing asset is evaluated regularly for impairment by discounting the estimated future cash flows using market-based discount rates and prepayment speeds. If the calculated present value of the servicing asset declines below the Company’s current carrying value, the servicing asset is written down to its present value. Based on the Company’s methodology in its valuation of the SBA servicing asset, the current carrying value is estimated to approximate the fair value. The inputs utilized in determining the fair value of SBA servicing asset are unobservable and accordingly, these financial assets are classified within Level 3 of the fair value hierarchy.
	Non-Maturing Deposits: The fair values for non-maturing deposits (deposits with no contractual termination date), which include non-interest bearing demand deposits, interest bearing transaction accounts, money market deposits and savings accounts are equal to their carrying amounts, which represent the amounts payable on demand. Because the carrying value and fair value are by definition identical, and accordingly non-maturity deposits are classified within Level 1 of the fair value hierarchy, these balances are not listed in the following tables.

	Maturing Deposits: The fair values of fixed maturity certificates of deposit (time deposits) are estimated using a discounted cash flow calculation that applies current market deposit interest rates to the Company’s current certificates of deposit interest rates for similar term certificates. The rates being paid on organic certificates of deposit at December 31, 2014 and December 31, 2013, were generally identical to the market interest rates for comparable terms and thus both the carry amount and fair value are generally considered approximately identical as of the reporting dates. The deposits acquired from PC Bancorp and 1^st Enterprise were initially adjusted to their fair value at the date of acquisition. The interest rates used to calculate the fair value adjustments on the PCB certificates were considered to be the market rates at the date of acquisition. The inputs utilized in determining the fair value of maturing deposits are unobservable and accordingly, these financial liabilities are classified within Level 2 of the fair value hierarchy.
	Securities Sold under Agreements to Repurchase (“Repos”): The fair value of securities sold under agreements to repurchase is estimated based on the discounted value of future cash flows expected to be paid on the deposits. The carrying amounts of Repos with maturities of 90 days or less approximate their fair values. The fair value of Repos with maturities greater than 90 days is estimated based on the discounted value of the contractual future cash flows. The inputs utilized in determining the fair value of securities sold under agreements to repurchase are observable and accordingly, these financial liabilities are classified within Level 2 of the fair value hierarchy.
	Subordinated Debentures: The fair value of the three variable rate subordinated debentures (“debentures”) is estimated using a discounted cash flow calculation that applies the three month LIBOR plus the margin index at December 31, 2014, to the cash flows from the debentures, based on the actual interest rate the debentures were accruing at December 31, 2014. Because all three of the debentures re-priced on December 16, 2014 based on the current three month LIBOR index rate plus the index margin at that date, and with relatively little to no change in the three month LIBOR index rate from the re-pricing date through December 31, 2014, the current face value of the debentures and their calculated fair value are approximately equal. The inputs utilized in determining the fair value of subordinated debentures are observable and accordingly, these financial liabilities are classified within Level 2 of the fair value hierarchy.
	Fair Value of Commitments: Loan commitments that are priced on an index plus a margin to a market rate of interest are reported at the carrying value of the loan commitment. Loan commitments on which the committed fixed interest rate is less than the current market rate were insignificant at December 31, 2014 and 2013.
	Interest Rate Risk: The Company assumes interest rate risk (the risk that general interest rate levels will change) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments will change when interest rate levels change and that change may be either favorable or unfavorable to the Company. Management attempts to match maturities of assets and liabilities to the extent believed necessary to minimize interest rate risk. However, borrowers with fixed rate obligations are less likely to prepay in a rising rate environment and more likely to prepay in a falling rate environment. In addition, depositors who are receiving fixed rates are more likely to withdraw funds before maturity in a rising rate environment and less likely to do so in a falling rate environment. Management monitors rates and maturities of assets and liabilities and attempts to minimize interest rate risk by adjusting terms of new loans and deposits and by investing in securities with terms that mitigate the Company’s overall rate risk.

	Assets and Liabilities Measured at Fair Value on a Recurring Basis
	The following table summarizes 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):


			Total			Quoted Prices			Significant			Significant
			Carrying			in Active			Other			Unobservable
			Value			Markets for			Observable			Inputs
						Identical Assets			Inputs			(Level 3)
						(Level 1)			(Level 2)
	Financial Assets – December 31, 2014
	Investment securities available-for-sale		$	226,962		$	—		$	226,962		$	—
	Interest Rate Swap Contracts		$	719					$	719
	Financial Liabilities – December 31, 2014
	Interest Rate Swap Contracts		$	3,515		$	—		$	3,515		$	—
	Financial Assets – December 31, 2013
	Investment securities available-for-sale		$	106,488		$	—		$	106,488		$	—
	Financial Liabilities – December 31, 2013
	Interest Rate Swap Contracts		$	3,943		$	—		$	3,943		$	—
	At December 31, 2014 and 2013, 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). Additionally, 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, 2014 and 2013.
	Assets Measured at Fair Value on a Non-recurring Basis
	The Company may be required periodically, to measure certain financial assets and financial liabilities at fair value on a nonrecurring basis, that is, the instruments 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 market value that were recognized at fair value below cost at the end of or during the period.
	The following table presents the balances of assets and liabilities measured at fair value on a non-recurring basis by caption and by level within the fair value hierarchy as of the dates indicated (dollars in thousands):


			Recorded			Quoted Prices			Significant			Significant
			Investment			in Active			Other			Unobservable
			Carrying			Markets for			Observable			Inputs
			Value			Identical Assets			Inputs			(Level 3)
						(Level 1)			(Level 2)
	Financial Assets – December 31, 2014
	Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans)		$	1,173		$	—		$	—		$	1,173
	Other real estate owned			850			—			—			850

	Total		$	2,023		$	—		$	—		$	2,023

Financial Assets – December 31, 2013
Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs offs (non-purchased credit impaired loans)		$	264		$	—		$	—		$	264

Total		$	264		$	—		$	—		$	264


The following table presents the significant unobservable inputs used in the fair value measurements for Level 3 assets and liabilities measured at fair value on a recurring or non-recurring basis as of the dates indicated (dollars in thousands):


		Fair Value at			Valuation		Significant	Significant
		December 31,			Methodology		Unobservable Inputs	Unobservable Input
		2014						Values
Financial Assets – December 31, 2014
Collateral dependent impaired loans with specific valuation allowance and/or partial charge-off			$1,173		Credit loss estimate of		Credit loss factors on	10%-80%
					aged accounts		aging of accounts
					receivable collateral		receivable collateral

							Estimated selling costs	15%

Other real estate owned		$	850		Residential real estate		Sales approach	6%
Other real estate owned		$	850		appraisal		Estimated selling costs	6%

		$	2,023


		Fair Value at			Valuation		Significant	Significant
		December 31,			Methodology		Unobservable Inputs	Unobservable Input
		2013						Values
Financial Assets – December 31, 2013
Collateral dependent impaired loans with specific valuation allowance and/or partial charge-off		$	45		Credit loss estimate of		Credit loss factors on	80%
					aged accounts		aging of accounts
					receivable collateral		receivable collateral

			219		Commercial real		Sales approach	8%
			219		estate appraisal		Estimated selling costs	8%

Total		$	264

Fair Value of Financial Assets and Liabilities
ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. 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, 2014 and December 31, 2013. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. The description of the valuation methodologies used for financial instruments measured at fair value and for estimating fair value for financial instruments not recorded at fair value has been described above.

The table below presents the level in the fair value hierarchy for the financial instruments estimated fair values, as of the dates indicated (dollars in thousands):


								Fair Value Measurements
		Carrying			Fair Value			Quoted			Significant			Significant
		Amount						Prices in			Other			Unobservable
								Active			Observable			Inputs
								Markets			Inputs			(Level 3)
								for			(Level 2)
								Identical
								Assets or
								Liabilities
								(Level 1)
December 31, 2014
Financial Assets
Investment securities available-for-sale		$	226,962		$	226,962		$	—		$	226,962		$	—
Investment securities held-to-maturity			47,147			47,159			—			47,159			—
Loans, net			1,612,113			1,627,717			—			—			1,627,717
Interest rate swap contracts			719			719			—			719			—
Financial Liabilities
Certificates of deposit			64,840			64,857			—			64,857			—
Securities sold under agreements to repurchase			9,411			9,411			—			9,411			—
Subordinated debentures			9,538			12,372			—			12,372
Interest rate swap contracts			3,515			3,515			—			3,515			—


								Fair Value Measurements
		Carrying			Fair Value			Quoted			Significant			Significant
		Amount						Prices in			Other			Unobservable
								Active			Observable			Inputs
								Markets			Inputs			(Level 3)
								for			(Level 2)
								Identical
								Assets or
								Liabilities
								(Level 1)
December 31, 2013
Financial Assets
Investment securities available-for-sale		$	106,488		$	106,488		$	—		$	106,488		$	—
Loans, net			922,591			926,500			—			—			926,500
Financial Liabilities
Certificates of deposit			63,581			63,680			—			63,680			—
Securities sold under agreements to repurchase			11,141			11,141			—			11,141			—
Subordinated debentures			9,379			12,372			—			12,372
Interest rate swap contracts			3,943			3,943			—			3,943			—

Reclassification

Reclassification	12 Months Ended
Reclassification	Dec. 31, 2014
Equity [Abstract]
Reclassification	Note 24 – Reclassification
Reclassification	Certain amounts in the prior year’s 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

Summary Quarterly Data	12 Months Ended
Summary Quarterly Data	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Summary Quarterly Data	Note 25 – Summary Quarterly Data (unaudited)


		2014 Quarters Ended								2013 Quarters Ended
	(Dollars in thousands, except per share data)	Dec.		Sept.		June		Mar.		Dec.		Sept.		June		Mar.
	(Dollars in thousands, except per share data)	31		30		30		31		31		30		30		31
	Interest income	$	16,264	$	13,238	$	13,039	$	12,636	$	12,841	$	12,822	$	13,114	$	12,069
	Interest expense		528		470		461		463		498		516		534		531

	Net interest income		15,736		12,768		12,578		12,173		12,343		12,306		12,580		11,538
	Provision for loan losses		1,721		35		408		75		934		631		1,153		134

	Net interest income after provision for loan losses		14,015		12,733		12,170		12,098		11,409		11,675		11,427		11,404

	Non-interest income		2,132		2,004		1,783		1,790		1,931		1,471		1,690		1,426

	Non-interest expense		14,107		10,031		9,698		9,549		9,620		9,430		9,281		9,309

	Net income before provision for income tax expense		2,040		4,706		4,255		4,339		3,720		3,716		3,836		3,521
	Provision for income tax		733		2,157		1,869		1,673		888		1,239		1,515		1,366

	Net Income	$	1,307	$	2,549	$	2,386	$	2,666	$	2,832	$	2,477	$	2,321	$	2,155

	Preferred stock dividends and discount accretion	$	124	$	—	$	—	$	—	$	—	$	—	$	—	$	—

	Net Income Available to Common Shareholders	$	1,183	$	2,549	$	2,386	$	2,666	$	2,832	$	2,477	$	2,321	$	2,155

	Basic income per share	$	0.09	$	0.23	$	0.22	$	0.25	$	0.26	$	0.24	$	0.22	$	0.21

	Diluted income per share	$	0.09	$	0.23	$	0.21	$	0.24	$	0.26	$	0.23	$	0.22	$	0.2

Condensed_Financial_Informatio

Condensed Financial Information of Parent Company	12 Months Ended
Condensed Financial Information of Parent Company	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information of Parent Company	Note 26 – Condensed Financial Information of Parent Company
	CU Bancorp, a California Corporation, was formed to facilitate a reorganization to create a bank holding company for the Bank in 2012. CU Bancorp became the parent of the Bank through a reorganization that occurred at the end of business on July 31, 2012. 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,
			2014				2013
	ASSETS
	Cash and due from banks		$	4,612			$	4,348
	Loans			1,410				1,786
	Investment in subsidiary			284,216				141,020
	Accrued interest receivable and other assets			103				207

	Total Assets		$	290,341			$	147,361

	LIABILITIES
	Subordinated debentures		$	9,538			$	9,379
	Accrued interest payable and other liabilities			1,611				58

	Total Liabilities			11,149				9,437
	SHAREHOLDERS’ EQUITY			279,192				137,924

	Total Liabilities and Shareholders’ Equity		$	290,341			$	147,361



	Parent Company Only Condensed Statements of Income		Years Ended December 31,
			2014				2013
	Interest Income		$	165			$	172

	Interest Expense			430				485
	Operating Expenses			911				556

	Total Expenses			1,341				1,041

	Loss Before Income Tax Benefit and Equity in Undistributed Earnings of Subsidiary			(1,176	)			(869	)
	Income tax benefit			257				371
	Loss Before Equity in Undistributed Earnings of Subsidiary			(919	)			(498	)

	Equity in undistributed earnings of subsidiary			9,827				10,283

	Net Income		$	8,908			$	9,785



	Parent Company Only Condensed Statements of Cash Flows		Years Ended December 31,
			2014				2013
	Cash flows from operating activities:
	Net income:		$	8,908			$	9,785
	Adjustments to reconcile net income to net cash used in operating activities:
	Equity in undistributed earnings of subsidiary			(9,827	)			(10,283	)
	Provision for loan losses			(100	)			—
	Net accretion of discounts/premiums			(26	)			(36	)
	Accretion of subordinated debenture discount			159				210
	Net change in fair value of interest rate contract			—				(70	)
	Decrease (increase) in accrued interest receivable and other assets			1,351				(226	)
	Decrease in accrued interest payable and other liabilities			396				32

	Net cash provided by operating activities			861				588

	Cash flows from investing activities:
	Cash paid for 1^st Enterprise fractional shares and dissenting shareholder			(89	)			—
	Capital contribution made to subsidiary			(2,500	)			—
	Maturity of certificate of deposit			—				370
	Net decrease in loans			502				721

Net cash (used in) provided by investing activities			(2,087	)			1,091

Cash flows from financing activities:
Net proceeds from exercise of stock options			2,029				2,790
Issuance costs of common stock for 1^st Enterprise merger			(27	)			—
Restricted stock repurchase			(471	)			(422	)
Dividends paid on preferred stock			(41	)			—

Net cash provided by financing activities			1,490				2,368

Net increase in cash			264				2,871
Cash, beginning of year			4,348				1,477

Cash, end of year		$	4,612			$	4,348

Supplemental disclosures of cash flow information:
Cash paid during the period for interest		$	270			$	281

Cash paid during the period for taxes		$	1			$	1

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
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, entities which were acquired in the merger with Premier Commercial Bancorp (“PC Bancorp”). 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 Financial Statements	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America 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 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. 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 changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan loss. Regulatory agencies may require the Company to recognize additions to the allowance for loan loss based on their judgment about information available to them at the time of their examination.
Business Combinations	Business Combinations
	The Company has a number of fair value adjustments recorded within the consolidated financial statements at December 31, 2014 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 include the Company’s goodwill, fair value adjustments on loans, core deposit intangible assets, other intangible assets, fair value adjustments to acquired lease obligations, fair value adjustments to high rate certificates of deposit and fair value adjustments on derivatives. The assets and liabilities acquired through acquisition 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. Goodwill is not amortized and is reviewed for impairment on October 1st of each year. If an event occurs or circumstances change that results in the Company’s fair value declining to below its book value, the Company would perform an impairment analysis at that time.
	Based on the Company’s 2014 goodwill impairment analysis, no impairment to goodwill has occurred. The Company is a sole reporting unit for evaluation of goodwill. We believe the estimated fair value of the Company is above its carrying value at December 31, 2014.
	The core deposit intangibles on non-maturing deposits, which represent the intangible value of depositor relationships resulting from deposit liabilities assumed through acquisition, are being amortized over the projected useful lives of the deposits. The weighted remaining life of the core deposit intangible is estimated at approximately 7 years at December 31, 2014. Core deposit intangibles are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable.
	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. For non-PCI loans, loan fair value adjustments consist of an interest rate premium or discount on each individual loan and are amortized to loan interest income based on the effective yield method over the remaining life of the loans.
Business Segments	Business Segments
	The Company is organized and operated as a single reporting segment, principally engaged in commercial business banking. The Company conducts its lending and deposit operations through ten 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 $12,450,000 and $1,129,000 were required by the Federal Reserve Bank of San Francisco as of December 31, 2014 and 2013, respectively. As of December 31, 2014, the Bank was in compliance with all known U.S. Federal Reserve Bank (“Federal Reserve”) reporting and reserve requirements. At December 31, 2014 and 2013 respectively, the Company had $4.1 million and $4.3 million pledged as collateral for its interest rate swap agreements with two counterparty banks.
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, including interest earning deposits with the Federal Reserve. These deposits and investments can generally provide the Company with immediate liquidity and generally can be liquidated the same day as is the case with the Federal Reserve and up to 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 $250,000 and have original maturity of between 30 days and 12 months. The current remaining maturities of the Company’s certificates of deposit at December 31, 2014 range from 2 days to 12 months with a weighted average maturity of 5.9 months and a weighted average yield of 0.62%.
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, 2014, 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 $30.0 million in non-interest bearing accounts, $30.8 million in interest bearing accounts, and $2.5 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 classification. 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 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. Under the held-to-maturity classification, if the Company has the intent and the ability at the time of purchase to hold these 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 these defaulted loans through the foreclosure process.
	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 the FHLB, Pacific Coast Bankers Bank (“PCBB”) and The Independent Banker’s Bank (“TIB”) and the preferred stock of TIB is carried at cost 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 FHLB has reported earnings for the years ended December 31, 2014, 2013, and 2012, and remains in compliance with its regulatory capital and liquidity requirements. See Note 5 – Investment Securities, Investments in FHLB Common Stock. With consideration given to these factors, management concluded that the stock was not impaired at December 31, 2014, 2013 or 2012.
	The Company’s investment in FHLB stock is included in other assets on the accompanying 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 their outstanding unpaid principal balances, net of deferred loan fees, unearned discounts, fair value credit valuation allowance and net of the allowance for loan loss. The Company recognizes loan origination fees to the extent they represent reimbursement for initial direct costs, as income at the time of loan boarding. The excess of fees over costs, if any, is deferred and recognized in 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 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.”
	Nonaccrual loans: For all loan types, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. Generally, the Company places loans in a nonaccrual status and the accrual of interest on loans is discontinued when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest is unlikely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent, if the loan is well secured by collateral and in the process of collection.
	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: A loan is identified as impaired when it is probable that interest and principal will not be collected according to the contractual terms of the original loan agreement. Generally, these loans are rated substandard or worse. Most impaired loans are classified as nonaccrual. However, there are some loans that are designated impaired due to doubt regarding collectability according to contractual terms, but are both fully secured by collateral and are current in their interest and principal payments. These impaired loans that are not classified as nonaccrual continue to pay as agreed. Impaired loans are measured for reserve requirements based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, as a practical expedient, at the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are charged against the allowance for loan loss. Factors that contribute to a performing loan being classified as impaired include payment status, collateral value, probability of collecting scheduled payments, delinquent taxes, and debts to other lenders that cannot be serviced out of existing cash flow.
	Troubled debt restructurings: A loan is classified as a troubled debt restructuring when a borrower experiences financial difficulties that lead to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. The loan terms which have been modified or restructured due to a borrower’s financial difficulty may include a reduction in the stated interest rate, an extension of the maturity at an interest rate below current market interest rates, a reduction in the face amount of the debt (principal forgiveness), a reduction in the accrued interest, or re-aging, extensions, deferrals, renewals, rewrites and other actions intended to minimize potential losses.

	Troubled debt restructurings are considered impaired loans and are evaluated for the amount of 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 has granted 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.
	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. The Company generally requires a period of sustained repayment for at least six months for return to accrual status.
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, 2014 and 2013, 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 noninterest 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, 2014 is adequate to absorb known and probable losses 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 reserve is established when the fair value of the impaired loan is lower than the carrying value 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 reserves. The individual loan is evaluated for a specific reserve 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. Impaired loans are evaluated by comparing the fair value of the collateral less costs to sell, if the loan is collateral dependent, and the present value of the expected future cash flows discounted at the loan’s effective interest rate, if the loan is not collateral dependent.

		•	Not all impaired loans require a specific reserve. 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 because a partial charge off of the loan has been taken. In those instances, neither a general reserve nor a specific reserve 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 ten 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	Other Real Estate Owned
	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. Revenue and expenses from operations and additions to the valuation allowance are included in other expenses.
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 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 to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on the Company’s balance sheet. There was no impairment as of December 31, 2014 or 2013. The increase in goodwill in 2014 was the result of the merger with 1^st Enterprise Bank on November 30, 2014. For more discussion, see Note 2 – Business Combinations.
	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 balance sheet.
	Leasehold right intangible is the difference in the fair value of an acquired lease and the amount of payments required to be made under the lease obligation. 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 Company’s balance sheet.
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. In December 2013, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2014-01, Investments – Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). ASU 2014-1 modifies the 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 modified conditions are met, the amendments permit an entity 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 the Company to account for its investments in LIHTC under ASU 2014-1. 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, 2014. 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) were recognized on the consolidated balance sheet at their current fair value. For derivatives designated as fair value hedges, changes in the fair value of the derivative and hedged item related to the hedged risk are recognized in earnings. ASC Topic 815 establishes the accounting and reporting standards requiring that every derivative instrument (including certain derivative instruments embedded in other contracts) 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. The Company also formally assesses the hedge’s current effectiveness in offsetting changes in the fair values of the hedged items. On an ongoing basis, the derivatives that are used in hedging transactions are evaluated 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 and Other Taxes	Income Taxes and Other Taxes
	Deferred income tax assets and liabilities are computed using the asset and liability method, which recognizes a liability or asset representing the tax effects, based on current tax law, of future deductible or taxable amounts attributable to events that have been recognized in the financial statements. 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 operating 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 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.
Comprehensive Income	Comprehensive Income
	The Company has adopted accounting guidance issued by FASB that requires all items recognized under accounting standards as components of comprehensive income be reported in a financial statement that is displayed with the same prominence as other financial statements. This also requires that an entity classify items of other comprehensive income by their nature in an annual financial statement. Other comprehensive income includes unrealized gains and losses, net of tax, on marketable securities classified as available-for-sale.
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
	In January 2014, the FASB issued ASU No. 2014-04, Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon foreclosure (a consensus of the FASB Emerging Issues Task Force). The objective of this Update is to reduce diversity in practice by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 clarifies that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. These amendments are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. An entity can elect to adopt these amendments using either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. We do not expect the adoption of this ASU to have a material impact on the Company’s financial position or results of operations.
	In June 2014, the FASB issued ASU No. 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures, to address investor concerns about the distinction in generally accepted accounting principles between repurchase agreements that settle at the same time as the maturity of the transferred financial asset and those that settle any time before maturity. ASU 2014-11 aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions all will be accounted for as secured borrowings. The new guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. ASU 2014-11 also requires a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. Further, the ASU requires expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The accounting changes are effective for public companies for the first interim or annual period beginning after December 15, 2014. In addition, for public companies, the disclosure for certain transactions accounted for as a sale is effective for the first interim or annual period beginning after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and interim periods beginning after March 15, 2014. Earlier application for a public company is prohibited, but all other companies and organizations may elect to apply the requirements for interim periods beginning after December 15, 2014. We do not expect the adoption of this ASU to have an impact on the Company’s financial position or results of operations.
	In August 2014, the FASB issued ASU No. 2014-14, Receivables – Troubled Debt Restructuring by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure. This ASU will require creditors to derecognize certain foreclosed government-guaranteed mortgage loans and to recognize a separate other receivable that is measured at the amount the creditor expects to recover from the guarantor, and to treat the guarantee and the receivable as a single unit of account. ASU 2014-14 is effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. For entities other than public business entities, the ASU is effective for annual periods ending after December 15, 2015, and interim periods within annual periods thereafter. An entity can elect a prospective or a modified retrospective transition method, but must use the same transition method that it elected under FASB ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. Early adoption, including adoption in an interim period, is permitted if the entity already adopted ASU 2014-04. We do not expect the adoption of this ASU to have a material impact on the Company’s financial position or results of operations.
	In November 2014, the FASB issued ASU No. 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or to Equity. This ASU will require an entity to determine the nature of the host contract by considering the economic characteristics and risks of the entire hybrid financial instrument issued in the form of a share, including the embedded derivative feature that is being evaluated for separate accounting from the host contract when evaluating whether the host contract is more akin to debt or equity. In evaluating the stated and implied substantive terms and features, the existence or omission of any single term or feature does not necessarily determine the economic characteristics and risks of the host contract. Although an individual term or feature may weigh more heavily in the evaluation on the basis of facts and circumstances, an entity should use judgment based on an evaluation of all the relevant terms and features. ASU 2014-16 is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. For all other entities, the ASU is effective for fiscal years ending after December 15, 2015, and interim periods within fiscal years thereafter. The effects of initially adopting the amendments should be applied on a modified retrospective basis to existing hybrid financial instruments issued in the form of a share as of the beginning of the fiscal year for which the amendment is effective. Retrospective application is permitted to all relevant prior periods. Early adoption, including adoption in an interim period, is permitted. If an entity early adopts the amendments in an interim period, any adjustments shall be reflected as of the beginning of the fiscal year that includes that interim period. We do not expect the adoption of this ASU to have an impact on the Company’s financial position or results of operations.

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
Business Combinations (Tables)	Dec. 31, 2014
Summary of Fair Value of Consideration Transferred, Fair Value Adjustments to Balance Sheet and Resulting Goodwill	The following table summarizes the fair value of the total consideration transferred as part of the merger with 1st Enterprise as well as the fair value adjustments to 1st Enterprise’s balance sheet as of the acquisition date and the resulting goodwill:


					November 30,
					2014
	Consideration paid:
	CU Bancorp common stock issued				$	102,712
	CU Bancorp preferred stock issued					15,921
	Fair value of 1st Enterprise stock options					9,561
	Cash paid to a dissenter shareholder					87
	Cash in lieu of fractional shares paid to 1st Enterprise shareholders					2

	Total consideration					128,283
	Net assets of 1st Enterprise at November 30, 2014					75,205
	Fair value adjustments:
	Investment securities	$	1,779
	Loans, net		(12,362	)
	Premises and equipment		(377	)
	Deferred taxes		3,019
	Core deposits and leasehold intangibles		7,424
	Other assets		(52	)
	Other liabilities		1,989

	Total fair value adjustments					1,420

	Fair value of net assets acquired				$	76,625

	Excess of consideration paid over fair value of net assets acquired (goodwill)				$	51,658

Fair Value of Loans Pursuant to Accounting Standards for PCI and Non-PCI Loans	The following table presents the fair value of loans pursuant to accounting standards for PCI and non-PCI loans as of the 1^st Enterprise acquisition date (dollars in thousands):


		November 30,
		2014
		PCI loans			Non-PCI loans			Total
	Contractually required payments	$	577		$	569,276		$	569,853
	Less: non-accretable difference		(108	)		—			(108	)

	Cash flows expected to be collected (undiscounted)		469			569,276			569,745
	Accretable yield		—			(16,562	)		(16,562	)

	Fair value of acquired loans	$	469		$	552,714		$	553,183

Supplemental Pro Forma Financial Information	The 2012 and 2011 pro forma net income excludes non-recurring merger expenses, net of taxes of approximately $2.6 million and $183,000, respectively (dollars in thousands, except for per share data).


	Supplemental Proforma Financial Data	Twelve Months Ended
	PC Bancorp Merger	December 31,
		2012			2011
	Net interest income	$	42,939		$	41,529
	Net income	$	2,281		$	2,787
	Diluted earnings per share	$	0.21		$	0.27
1st Enterprise Bank
Fair Values of Consideration Paid, Assets Acquired and Liabilities Assumed as of Date of Acquisition	In connection with the merger, the consideration paid, the assets acquired, and the liabilities assumed were recorded at fair value on the date of acquisition, as summarized in the following table (dollars in thousands):



		November 30,
		2014
	Assets acquired:
	Cash and due from banks	$	8,739
	Interest earning deposits in other financial institutions		11,554
	Investment securities available-for-sale		117,407
	Investment securities held-to-maturity		47,457
	Loans		553,183
	Premises and equipment, net		1,830
	Deferred tax asset		5,682
	Goodwill		51,658
	Core deposit and leasehold right intangibles		7,533
	Bank owned life insurance		16,871
	Accrued interest receivable and other assets		11,583

	Total assets acquired	$	833,497

	Liabilities assumed:
	Deposits	$	703,358
	Accrued interest payable and other liabilities		1,856

	Total liabilities assumed	$	705,214

	Total consideration paid	$	128,283

Schedule of Pro Forma Information	The following table also presents unaudited pro forma information for the periods 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).


		1^st Enterprise actual			Proforma			Proforma
		results from			Year ended			Year ended
		acquisition date			December 31,			December 31,
		through
		December 31, 2014			2014			2013
	Net interest income after provision for loan losses	$	2,023		$	77,140		$	68,771
	Net income		766		$	17,218		$	15,299

	Preferred stock dividends and discount accretion					(1,234	)		(889	)

	Net income available to common shareholders				$	15,984		$	14,410

	Diluted earnings per share				$	0.94		$	0.87

Computation_of_Book_Value_and_1

Computation of Book Value and Tangible Book Value per Common Share (Tables)	12 Months Ended
	Dec. 31, 2014
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 per share data):



		Years Ended
		December 31,
		2014		2013
	Total Shareholders’ Equity	$	279,192	$	137,924
	Less: Preferred stock		16,004		—
	Less: Goodwill		63,950		12,292
	Less: Core deposit and leasehold right intangibles		9,547		2,525

	Tangible Shareholders’ Equity	$	189,691	$	123,107

	Common shares issued and outstanding		16,683,856		11,081,364
	Book value per common share	$	15.78	$	12.45

	Tangible book value per common share	$	11.37	$	11.11

Computation_of_Earnings_per_Co1

Computation of Earnings per Common Share (Tables)	12 Months Ended
Computation of Earnings per Common Share (Tables)	Dec. 31, 2014
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Common Share Computations	The following table shows weighted average basic shares outstanding, potential dilutive shares related to stock options, unvested restricted stock, and weighted average diluted shares for each of the periods indicated (dollars in thousands, except per share data):


		Years Ended
		December 31,
		2014		2013		2012
	Net Income	$	8,908	$	9,785	$	1,727
	Less: Preferred stock dividends and discount accretion		124		—		—

	Net Income available to common shareholders	$	8,784	$	9,785	$	1,727

	Weighted average basic common shares outstanding		11,393,445		10,567,436		8,283,599
	Dilutive effect of potential common share issuances from stock options and restricted stock		274,288		269,425		127,150

	Weighted average diluted common shares outstanding		11,667,733		10,836,861		8,410,749

	Income per common share
	Basic	$	0.77	$	0.93	$	0.21
	Diluted	$	0.75	$	0.9	$	0.21

	Anti-dilutive shares not included in the calculation of diluted earnings per share		79,000		81,000		245,833

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
Investment Securities (Tables)	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Values of Investment Securities	The following tables present the amortized cost and estimated fair values of investment securities by major category as of the dates indicated (dollars in thousands):


				Gross Unrealized
	December 31, 2014	Amortized		Gains		Losses			Estimated
	December 31, 2014	Cost		Gains		Losses			Fair Value
	Available-for-sale:
	U.S. Govt Agency and Sponsored Agency – Note Securities	$	2,036	$	2	$	—		$	2,038
	U.S. Govt Agency – SBA Securities		54,062		770		345			54,487
	U.S. Govt Agency – GNMA Mortgage-Backed Securities		29,364		255		277			29,342
	U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities		107,348		457		577			107,228
	Corporate Securities		4,043		77		—			4,120
	Municipal Securities		1,039		11		—			1,050
	Asset Backed Securities		8,711		1		40			8,672
	U.S. Treasury Notes		20,031		—		6			20,025

	Total available-for-sale		226,634		1,573	$	1,245			226,962
	Held-to-maturity:
	Municipal Securities		47,147		169		157			47,159

	Total held-to-maturity		47,147		169	$	157			47,159

	Total investment securities	$	273,781	$	1,742	$	1,402		$	274,121



				Gross Unrealized
	December 31, 2013	Amortized		Gains		Losses			Estimated
	December 31, 2013	Cost		Gains		Losses			Fair Value
	Available-for-sale:
	U.S. Govt Agency and Sponsored Agency – Note Securities	$	4,153	$	1	$	2		$	4,152
	U.S. Govt Agency – SBA Securities		50,521		875		491			50,905
	U.S. Govt Agency – GNMA Mortgage-Backed Securities		28,107		180		909			27,378
	U.S. Govt Sponsored Agency – CMO & Mortgage-Backed Securities		15,348		345		479			15,214
	Corporate Securities		5,086		125		—			5,211
	Municipal Securities		3,621		9		2			3,628

	Total available-for-sale		106,836		1,535		1,883			106,488

	Total investment securities	$	106,836	$	1,535	$	1,883		$	106,488

Investment Securities with Unrealized Losses that are Considered to be Temporarily Impaired	The following tables present investment securities with unrealized losses that are considered to be temporarily-impaired, summarized and classified according to the duration of the loss period as of the dates indicated (dollars in thousands).


		< 12 Continuous				> 12 Continuous					Total
		Months				Months					Total
	December 31, 2014	Fair		Net		Fair			Net		Fair		Net
		Value		Unrealized		Value			Unrealized		Value		Unrealized
				Loss					Loss				Loss
	Temporarily-impaired available-for-sale investment securities:
	U.S. Govt. Agency – SBA Securities	$	10,688		87	$	10,095		$	258	$	20,783	$	345
	U.S. Govt. Agency – GNMA Mortgage-Backed Securities		12,784		65		8,784			212		21,568		277
	U.S. Govt. Sponsored Agency CMO & Mortgage-Backed Securities		64,360		413		6,584			164		70,944		577
	Asset Backed Securities		4,849		40		—			—		4,849		40
	U.S. Treasury Notes		20,025		6		—			—		20,025		6

	Total temporarily-impaired available-for-sale investment securities	$	112,706	$	611	$	25,463		$	634	$	138,169	$	1,245

	Temporarily-impaired held-to-maturity investment securities:
	Municipal Securities	$	23,966	$	157	$	—		$	—	$	23,966	$	157

	Total temporarily-impaired held-to-maturity investment securities	$	23,966	$	157	$	—		$	—	$	23,966	$	157



		< 12 Continuous				> 12 Continuous					Total
		Months				Months					Total
	December 31, 2013	Fair		Net		Fair			Net		Fair		Net
		Value		Unrealized		Value			Unrealized		Value		Unrealized
				Loss					Loss				Loss
	Temporarily-impaired available-for-sale investment securities:
	U.S. Govt. – Agency and Sponsored Agency Note Securities	$	1,041	$	2	$	—		$	—	$	1,041	$	2
	U.S. Govt. Agency – SBA Securities		11,686		491		—			—		11,686		491
	U.S. Govt. Agency – GNMA Mortgage-Backed Securities		15,693		721		1,864			188		17,557		909
	U.S. Govt. Sponsored Agency CMO & Mortgage-Backed Securities		7,650		479		—			—		7,650		479
	Municipal Securities		—		—		1,029			2		1,029		2

	Total temporarily-impaired available-for-sale investment securities	$	36,070	$	1,693	$	2,893		$	190	$	38,963	$	1,883

Maturities Schedule of Securities
		December 31, 2014
	Maturities Schedule of Securities	Amortized		Fair Value		Weighted
		Cost				Average
						Yield
	Due through one year	$	28,307	$	28,467		1.73	%
	Due after one year through five years		109,021		109,245		1.65	%
	Due after five years through ten years		62,641		62,389		1.91	%
	Due after ten years		26,665		26,861		2.55	%

	Total	$	226,634	$	226,962		1.83	%



		December 31, 2013
	Maturities Schedule of Securities	Amortized		Fair Value		Weighted
		Cost				Average
						Yield
	Due through one year	$	17,574	$	17,759		1.69	%
	Due after one year through five years		37,733		38,168		2.04	%
	Due after five years through ten years		25,486		24,952		2.41	%
	Due after ten years		26,043		25,609		2.75	%

	Total	$	106,836	$	106,488		2.24	%

Loans_Tables

Loans (Tables)	12 Months Ended
Loans (Tables)	Dec. 31, 2014
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,
		2014			2013
	Commercial and Industrial Loans:	$	528,517		$	299,473
	Loans Secured by Real Estate:
	Owner-Occupied Nonresidential Properties		339,309			197,605
	Other Nonresidential Properties		481,517			271,818
	Construction, Land Development and Other Land		72,223			47,074
	1-4 Family Residential Properties		121,985			65,711
	Multifamily Residential Properties		52,813			33,780

	Total Loans Secured by Real Estate		1,067,847			615,988

	Other Loans:		28,359			17,733

	Total Loans	$	1,624,723		$	933,194

Company's Gross Loans Stratified by Industry Concentration of Borrower	The following table is a breakout of the Company’s gross loans stratified by the industry concentration of the borrower by their respective NAICS code as of the dates indicated (dollars in thousands):


		December 31,
		2014			2013
	Real Estate	$	744,663		$	381,830
	Manufacturing		161,233			83,319
	Wholesale		124,336			60,291
	Construction		113,763			62,835
	Finance		96,074			46,393
	Hotel/Lodging		88,269			76,143
	Professional Services		64,215			49,739
	Other Services		45,781			21,448
	Healthcare		43,917			38,662
	Retail		35,503			23,157
	Administrative Management		28,016			15,218
	Restaurant/Food Service		24,525			35,244
	Transportation		18,158			9,531
	Information		15,457			11,709
	Education		10,253			10,270
	Entertainment		8,284			6,207
	Other		2,276			1,198

	Total	$	1,624,723		$	933,194

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,
		2014			2013			2012
	Allowance for loan loss at beginning of year	$	10,603		$	8,803		$	7,495
	Provision for loan losses		2,239			2,852			1,768
	Net (charge-offs) recoveries:
	Charge-offs		(692	)		(1,912	)		(687	)
	Recoveries		460			860			227

	Net (charge-offs) recoveries		(232	)		(1,052	)		(460	)

	Allowance for loan loss at end of year	$	12,610		$	10,603		$	8,803

	Net (charge-offs) recoveries to average loans		(0.02	)%		(0.12	)%		(0.08	)%
	Allowance for loan loss to total loans		0.78	%		1.14	%		1.03	%
	Allowance for loan loss to total loans accounted for at historical cost, which excludes purchased loans acquired by acquisition		1.39	%		1.5	%		1.54	%

Changes in Allowance for Loan Loss	The following table presents, by loan portfolio segment, the changes in the allowance for loan loss for the dates and periods indicated (dollars in thousands):


		Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and			Estate
					Other Land
	Year ended – December 31 2014
	Allowance for loan loss – Beginning balance	$	5,534		$	1,120		$	3,886		$	63		$	10,603
	Provision for loan losses		595			564			883			197			2,239
	Net (charge-offs) recoveries:
	Charge-offs		(619	)		—			(73	)		—			(692	)
	Recoveries		354			—			106			—			460

	Total net (charge-offs) recoveries		(265	)		—			33			—			(232	)

	Ending balance	$	5,864		$	1,684		$	4,802		$	260		$	12,610



		Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and			Estate
					Other Land
	Year ended – December 31 2013
	Allowance for loan loss – Beginning balance	$	4,572		$	2,035		$	2,084		$	112		$	8,803
	Provision for loan losses		2,596			(1,678	)		1,990			(56	)		2,852
	Net (charge-offs) recoveries:
	Charge-offs		(1,704	)		—			(200	)		(8	)		(1,912	)
	Recoveries		70			763			12			15			860

	Total net (charge-offs) recoveries		(1,634	)		763			(188	)		7			(1,052	)

	Ending balance	$	5,534		$	1,120		$	3,886		$	63		$	10,603

Schedule Represents both Allowance for Loan Loss and Associated Loan Balance Classified by Loan Portfolio Segment and by Credit Evaluation Methodology	The following table presents 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			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and			Estate
					Other Land
	December 31, 2014
	Allowance for loan loss:
	Individually evaluated for impairment	$	222		$	—		$	—		$	—		$	222
	Collectively evaluated for impairment		5,642			1,684			4,802			260			12,388
	Purchased credit impaired (loans acquired with deteriorated credit quality)		—			—			—			—			—

	Total Allowance for Loan Loss	$	5,864		$	1,684		$	4,802		$	260		$	12,610


	Loans receivable:
	Individually evaluated for impairment	$	1,914		$	—		$	737		$	—		$	2,651
	Collectively evaluated for impairment		525,910			72,223			993,195			28,359			1,619,687
	Purchased credit impaired (loans acquired with deteriorated credit quality)		693			—			1,692			—			2,385

	Total Loans Receivable	$	528,517		$	72,223		$	995,624		$	28,359		$	1,624,723



		Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and			Estate
					Other Land
	December 31, 2013
	Allowance for loan loss:
	Individually evaluated for impairment	$	4		$	—		$	—		$	—		$	4
	Collectively evaluated for impairment		5,520			1,120			3,886			63			10,589
	Purchased credit impaired (loans acquired with deteriorated credit quality)		10			—			—			—			10

	Total Allowance for Loan Loss	$	5,534		$	1,120		$	3,886		$	63		$	10,603


	Loans receivable:
	Individually evaluated for impairment	$	2,640		$	—		$	3,680		$	—		$	6,320
	Collectively evaluated for impairment		295,787			47,074			561,952			17,733			922,546
	Purchased credit impaired (loans acquired with deteriorated credit quality)		1,046			—			3,282			—			4,328

	Total Loans Receivable	$	299,473		$	47,074		$	568,914		$	17,733		$	933,194

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, 2014	Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and Other			Estate
					Land
	Pass	$	502,624		$	72,223		$	977,525		$	28,358		$	1,580,730
	Special Mention		8,738			—			4,878			—			13,616
	Substandard		17,155			—			13,221			1			30,377
	Doubtful		—			—			—			—			—

	Total	$	528,517		$	72,223		$	995,624		$	28,359		$	1,624,723


	December 31, 2013	Commercial			Construction,			Commercial			Other			Total
		and			Land			and
		Industrial			Development			Other Real
					and Other			Estate
					Land
	Pass	$	289,594		$	47,074		$	547,600		$	17,731		$	901,999
	Special Mention		1,540			—			2,613			—			4,153
	Substandard		8,339			—			18,701			2			27,042
	Doubtful		—			—			—			—			—

	Total	$	299,473		$	47,074		$	568,914		$	17,733		$	933,194

Aging 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, 2014	31-60			61-90			Greater			Total			Total			Current		Total Loans
		Days			Days			than			Past Due			Non
		Past Due			Past Due			90 Days			and			Accrual
								Past Due			Accruing
								and
								Accruing
	Commercial and Industrial	$	192		$	233		$	—		$	425		$	2,604		$	525,488	$	528,517
	Construction, Land Development and Other Land		—			—			—			—			—			72,223		72,223
	Commercial and Other Real Estate		354			—			—			354			1,305			993,965		995,624
	Other		—			—			—			—			—			28,359		28,359

	Total	$	546		$	233		$	0		$	779		$	3,909		$	1,620,035	$	1,624,723


	December 31, 2013	31-60			61-90			Greater			Total			Total			Current		Total Loans
		Days			Days			than			Past Due			Non
		Past Due			Past Due			90 Days			and			Accrual
								Past Due			Accruing
								and
								Accruing
	Commercial and Industrial	$	—		$	241		$	—		$	241		$	3,682		$	295,550	$	299,473
	Construction, Land Development and Other Land		—			—			—			—			—			47,074		47,074
	Commercial and Other Real Estate		—			—			—			—			5,874			563,040		568,914
	Other		—			—			—			—			—			17,733		17,733

	Total	$	—		$	241		$	—		$	241		$	9,556		$	923,397	$	933,194

Recorded Investment and Unpaid Principal Balances for Impaired Loans	The following tables include 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). This table excludes purchased credit impaired loans (loans acquired in acquisitions with deteriorated credit quality) of $2.4 million and $4.3 million at December 31, 2014 and 2013, respectively.
	Year ended December 31, 2014


		Recorded			Unpaid			Related			Average			Interest
		Investment			Principal			Allowance			Recorded			Income
					Balance						Investment			Recognized
	With no specific allowance recorded:
	Commercial and Industrial	$	520		$	609		$	—		$	869		$	—
	Commercial and Other Real Estate		737			739			—			1,058			—
	With an allowance recorded:
	Commercial and Industrial		1,394			1,546			222			1,428			—
	Total
	Commercial and Industrial		1,914			2,155			222			2,297			—
	Commercial and Other Real Estate		737			739			—			1,058			—

	Total	$	2,651		$	2,894		$	222		$	3,355		$	—

	Year ended December 31, 2013


		Recorded			Unpaid			Related			Average			Interest
		Investment			Principal			Allowance			Recorded			Income
					Balance						Investment			Recognized
	With no specific allowance recorded:
	Commercial and Industrial	$	2,540		$	5,347		$	—		$	1,835		$	—
	Construction, Land Development and Other Land		—			—			—			879			—
	Commercial and Other Real Estate		3,680			6,112			—			4,216			—
	With an allowance recorded:
	Commercial and Industrial		100			355			4			137			—
	Total
	Commercial and Industrial		2,640			5,702			4			1,972			—
	Construction, Land Development and Other Land		—			—			—			879			—
	Commercial and Other Real Estate		3,680			6,112			—			4,216			—

	Total	$	6,320		$	11,814		$	4		$	7,067		$	—

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,
		2014			2013
	Average recorded investment in impaired loans	$	4,991		$	7,067
	Interest foregone on impaired loans	$	421		$	710
	Cash collections applied to reduce principal balance	$	3,014		$	5,057
	Interest income recognized on cash collections	$	—		$	—
Recorded Investment and Unpaid Principal Balances for TDR Loans	The following tables include the recorded investment and unpaid principal balances for TDR loans for the periods indicated (dollars in thousands). This table includes two TDR loans that were purchased credit impaired. As of December 31, 2014, these loans had a recorded investment of $204,000 and unpaid principal balances of $384,000.


	Year ended December 31, 2014	Recorded			Unpaid			Interest
		Investment			Principal			Income
					Balance			Recognized
	Commercial and Industrial	$	530		$	719		$	—
	Commercial and Other Real Estate		114			115			—

	Total	$	644		$	834		$	—

	Year ended December 31, 2013
	Commercial and Industrial	$	541		$	843		$	—
	Commercial and Other Real Estate		2,173			2,785			—

	Total	$	2,714		$	3,628		$	—

Pre and Post Modification Recorded Investment in TDR Loans	The following tables show the pre- and post-modification recorded investment in TDR loans by type of modification and loan segment that have occurred during the periods indicated (dollars in thousands):


	Year ended December 31, 2014	Number			Pre-Modification			Post-
		of Loans			Recorded			Modification
					Investment			Recorded
								Investment
	Reduced Interest Rate and Lengthened Amortization:
	Commercial and Industrial		1		$	224		$	224
	Commercial and Other Real Estate		1			114			114

	Total		2		$	338		$	338

	Year ended December 31, 2013
	Reduced Interest Rate and Lengthened Amortization:
	Commercial and Industrial		1		$	310		$	310
	Commercial and Other Real Estate		—			—			—

	Total		1		$	310		$	310

Accretable Yield for Loans Acquired	The following table reflects the accretable net discount for loans acquired through acquisition, for the periods indicated (dollars in thousands):


		Year Ended December 31,
		2014			2013
	Balance, beginning of year	$	7,912		$	12,189
	Accretion, included in interest income		(3,023	)		(3,754	)
	Additions, due to acquisition		16,562			—
	Sold acquired loans		—			—
	Reclassifications to non-accretable yield		(49	)		(523	)

	Balance, end of year	$	21,402		$	7,912

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, 2014						December 31, 2013
		Unpaid			Carrying			Unpaid			Carrying
		Principal			Value			Principal			Value
		Balance						Balance
	Commercial and Industrial	$	1,205		$	693		$	1,599		$	1,046
	Commercial and Other Real Estate		3,018			1,692			5,611			3,282
	Other		62			—			—			—

	Total	$	4,285		$	2,385		$	7,210		$	4,328

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
		December 31,			December 31,
		2014			2013
	Balance, beginning of year	$	395		$	9
	Accretion, included in interest income		(71	)		(33	)
	Reclassifications from non-accretable yield		—			419

	Balance, end of year	$	324		$	395

Premises_and_Equipment_and_Lea1

Premises and Equipment and Lease Commitments (Tables)	12 Months Ended
Premises and Equipment and Lease Commitments (Tables)	Dec. 31, 2014
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,
		2014			2013
	Furniture and equipment	$	8,489		$	5,252
	Leasehold improvements		7,009			6,730

	Total		15,498			11,982
	Less: Accumulated depreciation and amortization		(10,121	)		(8,451	)

	Total	$	5,377		$	3,531

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, 2014 (dollars in thousands):


	Year	Amount
	2015	$	3,186
	2016		3,034
	2017		2,981
	2018		2,162
	2019		2,006
	Thereafter		6,066

	Total	$	19,435

Goodwill_Core_Deposit_and_Leas1

Goodwill, Core Deposit and Leasehold Right Intangibles (Tables)	12 Months Ended
	Dec. 31, 2014
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
		December 31,
		2014			2013
	Balance, beginning of year	$	12,292		$	12,292
	Goodwill acquired during the year		51,658			—
	Impairment losses		—			—

	Balance, end of year	$	63,950		$	12,292

	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,
		2014			2013			2012
	Gross amount of CDI:
	Balance, beginning of year	$	2,103		$	2,103		$	1,098
	Additions due to acquisitions		7,143			0			1,005

	Balance, end of year		9,246			2,103			2,103

	Accumulated Amortization:
	Balance, beginning of year		(665	)		(356	)		(137	)
	Amortization		(391	)		(309	)		(219	)

	Balance, end of year		(1,056	)		(665	)		(356	)

	Net CDI, end of year	$	8,190		$	1,438		$	1,747

Qualified_Affordable_Housing_P1

Qualified Affordable Housing Project Investments (Tables)	12 Months Ended
Qualified Affordable Housing Project Investments (Tables)	Dec. 31, 2014
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, 2014 and 2013. In addition, the table reflects the tax credits and tax benefits recorded by the Company during 2014 and 2013, the amortization of the investment and the net impact to the Company’s income tax provision for 2014 and 2013. 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		Net Income
	December 31, 2014		Investment		Recorded		Liability		and Benefits (1)		Investments (2)		Tax Benefit
			Value		Investment		Obligation
	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


	Qualified Affordable Housing Projects at		Original		Current		Unfunded		Tax Credits		Amortization of		Net Income
	December 31, 2013		Investment		Recorded		Liability		and Benefits (1)		Investments (2)		Tax Benefit
			Value		Investment		Obligation
	Enterprise Green Communities West II LP		$	1,000	$	787	$	190	$	236	$	160	$	76
	Enterprise Housing Partners Calgreen II Fund LP			2,050		1,735		1,817		390		314		76
	Enterprise Housing Partners XXIV LP			2,000		1,988		1,983		14		11		3

	Total - Investments in Qualified Affordable Housing Projects		$	5,050	$	4,510	$	3,990	$	640	$	485	$	155


	-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 several years (dollars in thousands):


	Qualified Affordable Housing Projects		Enterprise		Enterprise		Enterprise		Total
			Green		Housing		Housing		Net Income Tax
			Communities		Partners		Partners XXIV		Benefit
			West II LP		Calgreen II		LP
					Fund LP
	Anticipated net income tax benefit less amortization of investments:
	2015		$	44	$	43	$	53	$	140
	2016			43		39		55		137
	2017 and thereafter			245		304		414		963

	Total – anticipated net income tax benefit in Qualified Affordable Housing Projects		$	332	$	386	$	522	$	1,240

Deposits_Tables

Deposits (Tables)	12 Months Ended
Deposits (Tables)	Dec. 31, 2014
Text Block [Abstract]
Schedule of Maturity of Time Deposits	The following table shows the maturity of the Company’s time deposits of $100,000 or more at December 31, 2014.


	Maturity of Time Deposits of $100,000 or More*
	(Dollars in thousands)
	Three months or less		$	10,376
	Over three through six months			16,476
	Over six through twelve months			32,278
	Over twelve months			1,605

	Total		$	60,735


	*	includes CDARS^® reciprocal time deposits of $100,000 or more. Total CDARS^® reciprocal time deposits included in the table above are $29.4 million.

Borrowings_and_Subordinated_De1

Borrowings and Subordinated Debentures (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014

Date Issued

Amount

Interest Rate

Original

Maturity Date

Term

December 31, 2014

9,411

0.13% – 0.25%

2 days

January 2, 2015

Total

9,411

0.20%

December 31, 2013

Date Issued

Amount

Interest Rate

Original

Maturity Date

Term

3-Dec-13

750

0.10%

62 days

February 3, 2014

31-Dec-13

10,391

0.10% – 0.40%

2 days

January 2, 2014

Total

11,141

0.30%

Terms of Issuance Subordinated Debentures Outstanding

The following table summarizes the terms of each issuance of subordinated debentures outstanding as of December 31, 2014:

Series

Amount

Issuance

Maturity

Rate Index

Current

Next Reset

(in thousands)

Date

Rate

Date

Trust I

6,186

12/10/04

3/15/35

3 month LIBOR+2.05

2.291

3/17/15

Trust II

3,093

12/23/05

3/15/36

3 month LIBOR+1.75

1.991

3/17/15

Trust III

3,093

6/30/06

9/15/36

3 month LIBOR+1.85

2.091

3/17/15

Subtotal

12,372

Unamortized fair value adjustment

(2,834

)

Net

9,538

Short-Term Borrowings

Details regarding the Company’s short-term borrowings for the dates and periods indicated are reflected in the table below (dollars in thousands):

Year Ended December 31,

2014

2013

Balance

Average

Weighted

Balance

Average

Weighted

Balance

Average

Balance

Average

Rate

Securities sold under agreements to repurchase

9,411

13,579

0.25

11,141

24,376

0.3

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
Derivative Financial Instruments (Tables)	Dec. 31, 2014
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,
		2014			2013
	Derivatives not designated as hedging instruments:
	Interest rate swap contracts – loans
	Increase in fair value of interest rate swap contracts	$	219		$	306
	Payments on interest rate swap contracts on loans		(273	)		(289	)

	Net increase (decrease) in other non-interest income		(54	)		17

	Interest rate swap contracts – subordinated debenture
	Increase in fair value of interest rate swap contracts		—			70
	Payments on interest rate swap contracts on subordinated debentures		—			(70	)

	Net increase in other non-interest income		—			—

	Net increase (decrease) in other non-interest income	$	(54	)	$	17

	Derivatives designated as hedging instruments:
	Interest rate swap contracts – loans
	Increase in fair value of interest rate swap contracts	$	927		$	1,719
	Increase (decrease) in fair value of hedged loans		315			(554	)
	Payments on interest rate swap contracts on loans		(1,256	)		(1,294	)

	Net (decrease) in interest income on loans	$	(14	)	$	(129	)

1st Enterprise Bank
Balance Sheet Classification of Derivative Financial Instruments	The following table presents the fair values of the asset and liability of the Company’s derivative instruments acquired from 1^st Enterprise as of December 31, 2014 (dollars in thousands):


		Asset Derivatives			Liability Derivatives
		December 31,			December 31,
		2014			2014
	Interest rate swap contracts fair value	$	719		$	719

	Balance sheet location		Accrued Interest			Accrued Interest
			Receivable and Other			Payable and Other
			Assets			Liabilities
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 and periods indicated (dollars in thousands):


		Liability Derivatives
		December 31,			December 31,
		2014			2013
	Fair Value Hedges
	Total interest rate contacts notional amount	$	29,289		$	31,914

	Derivatives not designated as hedging instruments:
	Interest rate swap contracts fair value	$	519		$	738
	Derivatives designated as hedging instruments:
	Interest rate swap contracts fair value		2,277			3,205

	Total interest rate contracts fair value	$	2,796		$	3,943

	Balance sheet location		Accrued Interest Payable			Accrued Interest Payable
	Balance sheet location		and Other Liabilities			and Other Liabilities

Balance_Sheet_Offsetting_Table

Balance Sheet Offsetting (Tables)	12 Months Ended
Balance Sheet Offsetting (Tables)	Dec. 31, 2014
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		Gross Amounts				Net Amount
		Amounts		Amounts		of Assets		Not Offset in the				(Collateral
		Recognized		Offset in the		Presented		Consolidated Balance Sheets				over liability
		in the		Consolidated		in the						balance
		Consolidated		Balance		Consolidated						required to
		Balance		Sheets		Balance						be pledged)
		Sheets				Sheets		Financial		Collateral
								Instruments		Pledged
	December 31, 2014
	Financial Assets:
	Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments)	$	719	$	—	$	719	$	719	$	—	$	—

	Total	$	719	$	—	$	719	$	719	$	—	$	—

	Financial Liabilities:
	Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments)	$	3,515	$	—	$	3,515	$	3,515	$	4,150	$	635
	Securities sold under agreements to repurchase		9,411		—		9,411		9,411		32,304		22,893

	Total	$	12,926	$	—	$	12,926	$	12,926	$	36,454	$	23,528


	December 31, 2013
	Financial Liabilities:
	Interest rate swap contracts fair value (see Note 14 – Derivative Financial Instruments)	$	3,943	$	—	$	3,943	$	3,943	$	4,194	$	251
	Securities sold under agreements to repurchase		11,141		—		11,141		11,141		11,750		609

	Total	$	15,084	$	—	$	15,084	$	15,084	$	15,944	$	860

Stock_Options_and_Restricted_S1

Stock Options and Restricted Stock (Tables)	12 Months Ended
Stock Options and Restricted Stock (Tables)	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Future Compensation Expense Related to Non-Vested Stock Option and Restricted Stock Grants	At December 31, 2014, future compensation expense related to non-vested stock option and restricted stock grants aggregated to the amounts reflected in the table below (dollars in thousands):


	Future Stock Based Compensation Expense	Stock			Restricted		Total
	Future Stock Based Compensation Expense	Options			Stock		Total
	2015	$	2		$	1,946	$	1,948
	2016		—			1,034		1,034
	2017		—			323		323
	2018		—			93		93
	Thereafter		—			—		—

	Total	$	2		$	3,396	$	3,398

Stock Option Activity	The following table summarizes the stock option activity under the plans for the year ended December 31, 2014:


		Shares			Weighted		Weighted		Aggregate
					Average		Average		Intrinsic
					Exercise		Remaining		Value
					Price		Contractual		(in thousands)
							Term
							(in years)
	Outstanding stock options at December 31, 2013		434,740		$	13.89		2.1	$	1,913
	Adoption of 1^ST Enterprise 2006 Stock Incentive Plan		802,766		$	7.84		1.6	$	11,121
	Granted		—
	Exercised		(221,016	)
	Forfeited		—
	Expired		—

	Outstanding stock options at December 31, 2014		1,016,490		$	10.13		1.6	$	11,770

	Exercisable options at December 31, 2014		1,010,290		$	10.12		1.6	$	11,711
	Unvested options at December 31, 2014		6,200		$	12.2		2.3	$	59
	Outstanding, vested and expected to vest at December 31, 2014		1,016,490		$	10.13		1.6	$	11,770
Restricted Stock Activity	The following table summarizes the restricted stock activity under the Equity Plan for the year ended December 31, 2014:



		Number			Weighted-Average
		of Shares			Grant-Date Fair
					Value per Share
	Restricted Stock:
	Unvested, at December 31, 2013		266,050		$	13.49
	Granted		172,900			19.39
	Vested		(124,428	)		13.75
	Cancelled and forfeited		(5,016	)		14.88

	Unvested, at December 31, 2014		309,506		$	16.66

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	Income tax expense (benefit) consists of the following (dollars in thousands):


		Year Ended December 31,
		2014			2013			2012
	Current provision
	Federal	$	4,517		$	1,669		$	2,497
	State		1,183			238			265

	Total current provision		5,700			1,907			2,762
	Deferred provision (benefit)
	Federal		382			2,674			(917	)
	State		350			427			(180	)

	Total deferred provision (benefit)		732			3,101			(1,097	)

	Total current and deferred provision	$	6,432		$	5,008		$	1,665


Components of Net Deferred Tax Asset Recognized Accompanying Balance Sheet	The following is a summary of the components of the net deferred tax asset recognized in the accompanying balance sheets as of the dates indicated (dollars in thousands):


		December 31,
		2014			2013
	Deferred Tax Assets
	Federal tax operating loss carryforward	$	99		$	317
	State tax operating loss carryforward		162			168
	Allowance for loan loss		5,823			4,726
	Purchase accounting and loan fair value adjustments		9,430			5,558
	Accruals and other liabilities		1,457			1,570
	Stock compensation and deferred compensation costs		6,703			3,145
	Net unrealized loss on securities available-for-sale		—			143
	Start up, organizational and other costs		612			255

	Total deferred tax assets		24,286			15,882

	Deferred Tax Liabilities
	Net unrealized gain on securities available-for-sale		(138	)		—
	State tax liability		(1,041	)		(1,270	)
	Unamortized fair value on subordinated debentures		(1,310	)		(1,402	)
	Core deposit intangibles		(3,754	)		(478	)
	Prepaid expense and other		(1,524	)		(815	)

	Total deferred tax liabilities		(7,767	)		(3,965	)

	Valuation allowance		(15	)		(82	)

	Deferred tax assets, net	$	16,504		$	11,835

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,
		2014						2013						2012
		Amount			Percent			Amount			Percent			Amount			Percent
	Federal income tax expense at statutory rate	$	5,369			35	%	$	5,178			35	%	$	1,187			35	%
	State franchise taxes, net of federal benefit, excluding LIHTC investments		1,209			7.88			524			3.54			315			9.29
	Effect of rate change on net deferred tax asset		—			—			(326	)		(2.20	)		—			—
	Release of state valuation allowance on use of net operating loss		(68	)		(0.44	)		(68	)		(0.46	)		(150	)		(4.43	)
	Meals and entertainment, dues and other non-deductible items		75			0.49			54			0.37			47			1.39
	Cash surrender life insurance		(231	)		(1.51	)		(210	)		(1.42	)		(91	)		(2.68	)
	Stock compensation expense		(53	)		(0.35	)		(126	)		(0.85	)		39			1.15
	LIHTC investments		(119	)		(0.77	)		(155	)		(1.05	)		0			0
	Merger costs		515			3.36			5			0.03			300			8.84
	Other		(265	)		1.73			132			0.89			18			0.53

		$	6,432			41.93	%	$	5,008			33.85	%	$	1,665			49.09	%

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
Shareholders' Equity (Tables)	Dec. 31, 2014
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):


		Before			Tax			Net of
		Tax			Effect			Tax
	Year ended December 31, 2014
	Net unrealized gains (losses) on investment securities:
	Beginning balance	$	(348	)	$	143		$	(205	)

	Non-credit portion of other-than-temporary impairments arising during the period		—			—			—
	Net unrealized gain (losses) arising during the period		681			(286	)		395

	Net other comprehensive loss		681			(286	)		395

	Ending balance	$	333		$	(143	)	$	190



		Before			Tax			Net of
		Tax			Effect			Tax
	Year ended December 31, 2013
	Net unrealized gains (losses) on investment securities:
	Beginning balance	$	2,369		$	(975	)	$	1,394

	Non-credit portion of other-than-temporary impairments arising during the period		(41	)		17			(24	)
	Net unrealized losses arising during the period		(2,629	)		1,082			(1,547	)

	Other comprehensive loss before reclassification		(2,670	)		1,099			(1,571	)
	Reclassification adjustment for gains realized in net income		(47	)		19			(28	)

	Net other comprehensive loss		(2,717	)		1,118			(1,599	)

	Ending balance	$	(348	)	$	143		$	(205	)

Regulatory_Matters_Tables

Regulatory Matters (Tables)	12 Months Ended
Regulatory Matters (Tables)	Dec. 31, 2014
Text Block [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The following tables present the Total Risk-Based Capital Ratio, Tier 1 Risk-Based Capital Ratio and the Tier 1 Leverage Ratio of the Consolidated Company in addition to the Bank as of December 31, 2014, and December 31, 2013, and compare the actual ratios to the capital requirements imposed by government regulations. All amounts reflected in the table below are stated in thousands, except percentages:
	CU Bancorp Consolidated:


		Actual					For Capital Adequacy					To Be Well-
							Purposes					Capitalized Under
												Prompt Corrective
												Provisions
		Amount		Ratio			Amount		Ratio			Amount		Ratio
	As of December 31, 2014
	Total Risk-Based Capital Ratio	$	231,228		11.61	%	$	159,363		8	%	$	199,204		10	%
	Tier 1 Risk-Based Capital Ratio		218,147		10.95	%		79,682		4	%		119,523		6	%
	Tier 1 Leverage Ratio		218,147		12.92	%		67,564		4	%		84,455		5	%
	As of December 31, 2013
	Total Risk-Based Capital Ratio	$	145,372		12.8	%	$	90,844		8	%	$	113,555		10	%
	Tier 1 Risk-Based Capital Ratio		134,440		11.84	%		45,422		4	%		68,133		6	%
	Tier 1 Leverage Ratio		134,440		9.57	%		56,172		4	%		70,215		5	%
	California United Bank:


		Actual					For Capital Adequacy					To Be Well-
							Purposes					Capitalized Under
												Prompt Corrective
												Provisions
		Amount		Ratio			Amount		Ratio			Amount		Ratio
	As of December 31, 2014
	Total Risk-Based Capital Ratio	$	223,112		11.2	%	$	159,300		8	%	$	199,125		10	%
	Tier 1 Risk-Based Capital Ratio		210,031		10.55	%		79,650		4	%		119,475		6	%
	Tier 1 Leverage Ratio		210,031		12.44	%		67,532		4	%		84,415		5	%
	As of December 31, 2013
	Total Risk-Based Capital Ratio	$	135,682		11.96	%	$	90,772		8	%	$	113,465		10	%
	Tier 1 Risk-Based Capital Ratio		124,750		10.99	%		45,386		4	%		68,079		6	%
	Tier 1 Leverage Ratio		124,750		8.9	%		56,082		4	%		70,102		5	%

Fair_Value_Information_Tables

Fair Value Information (Tables)	12 Months Ended
Fair Value Information (Tables)	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis	The following table summarizes 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):


		Total		Quoted Prices			Significant		Significant
		Carrying		in Active			Other		Unobservable
		Value		Markets for			Observable		Inputs
				Identical Assets			Inputs		(Level 3)
				(Level 1)			(Level 2)
	Financial Assets – December 31, 2014
	Investment securities available-for-sale	$	226,962	$	—		$	226,962	$	—
	Interest Rate Swap Contracts	$	719				$	719
	Financial Liabilities – December 31, 2014
	Interest Rate Swap Contracts	$	3,515	$	—		$	3,515	$	—
	Financial Assets – December 31, 2013
	Investment securities available-for-sale	$	106,488	$	—		$	106,488	$	—
	Financial Liabilities – December 31, 2013
	Interest Rate Swap Contracts	$	3,943	$	—		$	3,943	$	—
Balances of Assets and Liabilities Measured at Fair Value on Non-Recurring Basis	The following table presents the balances of assets and liabilities measured at fair value on a non-recurring basis by caption and by level within the fair value hierarchy as of the dates indicated (dollars in thousands):


		Recorded		Quoted Prices			Significant		Significant
		Investment		in Active			Other		Unobservable
		Carrying		Markets for			Observable		Inputs
		Value		Identical Assets			Inputs		(Level 3)
				(Level 1)			(Level 2)
	Financial Assets – December 31, 2014
	Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs (non-purchased credit impaired loans)	$	1,173	$	—		$	—	$	1,173
	Other real estate owned		850		—			—		850

	Total	$	2,023	$	—		$	—	$	2,023

	Financial Assets – December 31, 2013
	Collateral dependent impaired loans with specific valuation allowance and/or partial charge-offs offs (non-purchased credit impaired loans)	$	264	$	—		$	—	$	264

	Total	$	264	$	—		$	—	$	264


Significant Unobservable Inputs Used in Fair Value Measurements for Level 3 Assets and Liabilities 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 and liabilities measured at fair value on a recurring or non-recurring basis as of the dates indicated (dollars in thousands):


		Fair Value at		Valuation		Significant	Significant
		December 31,		Methodology		Unobservable Inputs	Unobservable Input
		2014					Values
	Financial Assets – December 31, 2014
	Collateral dependent impaired loans with specific valuation allowance and/or partial charge-off		$1,173	Credit loss estimate of		Credit loss factors on	10%-80%
				aged accounts		aging of accounts
				receivable collateral		receivable collateral

						Estimated selling costs	15%

	Other real estate owned	$	850	Residential real estate		Sales approach	6%
	Other real estate owned	$	850	appraisal		Estimated selling costs	6%

		$	2,023


		Fair Value at		Valuation		Significant	Significant
		December 31,		Methodology		Unobservable Inputs	Unobservable Input
		2013					Values
	Financial Assets – December 31, 2013
	Collateral dependent impaired loans with specific valuation allowance and/or partial charge-off	$	45	Credit loss estimate of		Credit loss factors on	80%
				aged accounts		aging of accounts
				receivable collateral		receivable collateral

			219	Commercial real		Sales approach	8%
			219	estate appraisal		Estimated selling costs	8%

	Total	$	264

Level in Fair Value Hierarchy for Financial Instruments Estimated Fair Values	The table below presents the level in the fair value hierarchy for the financial instruments estimated fair values, as of the dates indicated (dollars in thousands):


							Fair Value Measurements
		Carrying		Fair Value			Quoted		Significant		Significant
		Amount					Prices in		Other		Unobservable
							Active		Observable		Inputs
							Markets		Inputs		(Level 3)
							for		(Level 2)
							Identical
							Assets or
							Liabilities
							(Level 1)
	December 31, 2014
	Financial Assets
	Investment securities available-for-sale	$	226,962	$	226,962		$	—	$	226,962	$	—
	Investment securities held-to-maturity		47,147		47,159			—		47,159		—
	Loans, net		1,612,113		1,627,717			—		—		1,627,717
	Interest rate swap contracts		719		719			—		719		—
	Financial Liabilities
	Certificates of deposit		64,840		64,857			—		64,857		—
	Securities sold under agreements to repurchase		9,411		9,411			—		9,411		—
	Subordinated debentures		9,538		12,372			—		12,372
	Interest rate swap contracts		3,515		3,515			—		3,515		—


							Fair Value Measurements
		Carrying		Fair Value			Quoted		Significant		Significant
		Amount					Prices in		Other		Unobservable
							Active		Observable		Inputs
							Markets		Inputs		(Level 3)
							for		(Level 2)
							Identical
							Assets or
							Liabilities
							(Level 1)
	December 31, 2013
	Financial Assets
	Investment securities available-for-sale	$	106,488	$	106,488		$	—	$	106,488	$	—
	Loans, net		922,591		926,500			—		—		926,500
	Financial Liabilities
	Certificates of deposit		63,581		63,680			—		63,680		—
	Securities sold under agreements to repurchase		11,141		11,141			—		11,141		—
	Subordinated debentures		9,379		12,372			—		12,372
	Interest rate swap contracts		3,943		3,943			—		3,943		—

Summary_Quarterly_Data_Tables

Summary Quarterly Data (Tables)	12 Months Ended
Summary Quarterly Data (Tables)	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Summary Quarterly Financial Data
		2014 Quarters Ended								2013 Quarters Ended
	(Dollars in thousands, except per share data)	Dec.		Sept.		June		Mar.		Dec.		Sept.		June		Mar.
	(Dollars in thousands, except per share data)	31		30		30		31		31		30		30		31
	Interest income	$	16,264	$	13,238	$	13,039	$	12,636	$	12,841	$	12,822	$	13,114	$	12,069
	Interest expense		528		470		461		463		498		516		534		531

	Net interest income		15,736		12,768		12,578		12,173		12,343		12,306		12,580		11,538
	Provision for loan losses		1,721		35		408		75		934		631		1,153		134

	Net interest income after provision for loan losses		14,015		12,733		12,170		12,098		11,409		11,675		11,427		11,404

	Non-interest income		2,132		2,004		1,783		1,790		1,931		1,471		1,690		1,426

	Non-interest expense		14,107		10,031		9,698		9,549		9,620		9,430		9,281		9,309

	Net income before provision for income tax expense		2,040		4,706		4,255		4,339		3,720		3,716		3,836		3,521
	Provision for income tax		733		2,157		1,869		1,673		888		1,239		1,515		1,366

	Net Income	$	1,307	$	2,549	$	2,386	$	2,666	$	2,832	$	2,477	$	2,321	$	2,155

	Preferred stock dividends and discount accretion	$	124	$	—	$	—	$	—	$	—	$	—	$	—	$	—

	Net Income Available to Common Shareholders	$	1,183	$	2,549	$	2,386	$	2,666	$	2,832	$	2,477	$	2,321	$	2,155

	Basic income per share	$	0.09	$	0.23	$	0.22	$	0.25	$	0.26	$	0.24	$	0.22	$	0.21

	Diluted income per share	$	0.09	$	0.23	$	0.21	$	0.24	$	0.26	$	0.23	$	0.22	$	0.2

Condensed_Financial_Informatio1

Condensed Financial Information of Parent Company (Tables)	12 Months Ended
Condensed Financial Information of Parent Company (Tables)	Dec. 31, 2014
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,
		2014			2013
	ASSETS
	Cash and due from banks	$	4,612		$	4,348
	Loans		1,410			1,786
	Investment in subsidiary		284,216			141,020
	Accrued interest receivable and other assets		103			207

	Total Assets	$	290,341		$	147,361

	LIABILITIES
	Subordinated debentures	$	9,538		$	9,379
	Accrued interest payable and other liabilities		1,611			58

	Total Liabilities		11,149			9,437
	SHAREHOLDERS’ EQUITY		279,192			137,924

	Total Liabilities and Shareholders’ Equity	$	290,341		$	147,361


Parent Company Condensed Income Statement	Parent Company Only Condensed Statements of Income	Years Ended December 31,
		2014			2013
	Interest Income	$	165		$	172

	Interest Expense		430			485
	Operating Expenses		911			556

	Total Expenses		1,341			1,041

	Loss Before Income Tax Benefit and Equity in Undistributed Earnings of Subsidiary		(1,176	)		(869	)
	Income tax benefit		257			371
	Loss Before Equity in Undistributed Earnings of Subsidiary		(919	)		(498	)

	Equity in undistributed earnings of subsidiary		9,827			10,283

	Net Income	$	8,908		$	9,785

Parent Company Condensed Cash Flow Statement	Parent Company Only Condensed Statements of Cash Flows	Years Ended December 31,
		2014			2013
	Cash flows from operating activities:
	Net income:	$	8,908		$	9,785
	Adjustments to reconcile net income to net cash used in operating activities:
	Equity in undistributed earnings of subsidiary		(9,827	)		(10,283	)
	Provision for loan losses		(100	)		—
	Net accretion of discounts/premiums		(26	)		(36	)
	Accretion of subordinated debenture discount		159			210
	Net change in fair value of interest rate contract		—			(70	)
	Decrease (increase) in accrued interest receivable and other assets		1,351			(226	)
	Decrease in accrued interest payable and other liabilities		396			32

	Net cash provided by operating activities		861			588

	Cash flows from investing activities:
	Cash paid for 1^st Enterprise fractional shares and dissenting shareholder		(89	)		—
	Capital contribution made to subsidiary		(2,500	)		—
	Maturity of certificate of deposit		—			370
	Net decrease in loans		502			721

	Net cash (used in) provided by investing activities		(2,087	)		1,091

	Cash flows from financing activities:
	Net proceeds from exercise of stock options		2,029			2,790
	Issuance costs of common stock for 1^st Enterprise merger		(27	)		—
	Restricted stock repurchase		(471	)		(422	)
	Dividends paid on preferred stock		(41	)		—

	Net cash provided by financing activities		1,490			2,368

	Net increase in cash		264			2,871
	Cash, beginning of year		4,348			1,477

	Cash, end of year	$	4,612		$	4,348

	Supplemental disclosures of cash flow information:
	Cash paid during the period for interest	$	270		$	281

	Cash paid during the period for taxes	$	1		$	1

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
	Office	Office	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Full service branch offices	10	10
Federal Reserve Bank Balance	$12,450,000	$12,450,000	$1,129,000
Certificates of deposit in other financial institutions	76,433,000	76,433,000	60,307,000
Deposits not covered by FDIC insurance	30,000,000	30,000,000
Interest bearing deposit	98,590,000	98,590,000	218,131,000
Loans classified as held for sale	0	0	0
Goodwill, impairment	0	0	0
Core Deposits
Summary Of Significant Accounting Policies [Line Items]
Weighted remaining life of intangible assets		7 years
Certificates of Deposit
Summary Of Significant Accounting Policies [Line Items]
Certificates of deposit, weighted average maturity period		5 months 27 days
Certificates of deposit, weighted average yield	0.62%	0.62%
Other Financial Institutions [Member]
Summary Of Significant Accounting Policies [Line Items]
Interest bearing deposit	30,800,000	30,800,000
Certificates of Deposits	2,500,000	2,500,000
Interest rate swap contracts fair value
Summary Of Significant Accounting Policies [Line Items]
Amount pledged as collateral	4,100,000	4,100,000	4,300,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Certificates of deposit original maturity period		30 days
Certificates of deposit remaining maturity period		2 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
Maximum \| Furniture and Fixtures
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life		10 years

Business_Combinations_Addition

Business Combinations - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2014	Dec. 31, 2011
Business Acquisition [Line Items]
Merger expenses	$2,302,000	$43,000	$3,058,000
Goodwill	63,950,000	12,292,000	12,292,000
1st Enterprise Bank
Business Acquisition [Line Items]
Merger date				2-Jun-14
Share received in exchange for each share				1.345
Common stock issued				5,240,409
Fair value of common stock issued as part of consideration paid				102,700,000
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
Merger expenses	2,300,000
Goodwill	51,700,000			51,658,000
Other intangible assets	7,400,000			7,533,000
Other intangible assets, amortization period	10 years
Estimated non-recurring merger expenses for legal, accounting, and other professional fees, net of tax	3,200,000
PC Bancorp
Business Acquisition [Line Items]
Estimated non-recurring merger expenses for legal, accounting, and other professional fees, net of tax			$2,600,000		$183,000

Fair_Values_of_Consideration_P

Fair Values of Consideration Paid, Assets Acquired and Liabilities Assumed as of Date of Acquisition (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2014
Assets acquired:
Goodwill	$63,950	$12,292	$12,292
1st Enterprise Bank
Assets acquired:
Cash and due from banks				8,739
Interest earning deposits in other financial institutions				11,554
Investment securities available-for-sale				117,407
Investment securities held-to-maturity				47,457
Loans				553,183
Premises and equipment, net				1,830
Deferred tax asset				5,682
Goodwill	51,700			51,658
Core deposit and leasehold right intangibles	7,400			7,533
Bank owned life insurance				16,871
Accrued interest receivable and other assets				11,583
Total assets acquired				833,497
Liabilities assumed:
Deposits				703,358
Accrued interest payable and other liabilities				1,856
Total liabilities assumed				705,214
Total consideration paid				$128,283

Summary_of_Fair_Value_of_Consi

Summary of Fair Value of Consideration Transferred, Fair Value Adjustments to Balance Sheet and Resulting Goodwill (Detail) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Nov. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair value adjustments:
Excess of consideration paid over fair value of net assets acquired (goodwill)		$63,950	$12,292	$12,292
1st Enterprise Bank
Consideration paid:
Fair value of 1st Enterprise stock options	9,561
Cash paid to a dissenter shareholder	87
Cash in lieu of fractional shares paid to 1st Enterprise shareholders	2
Total consideration	128,283
Net assets of 1st Enterprise at November 30, 2014	75,205
Fair value adjustments:
Total fair value adjustments	1,420
Fair value of net assets acquired	76,625
Excess of consideration paid over fair value of net assets acquired (goodwill)	51,658	51,700
1st Enterprise Bank \| Investment securities
Fair value adjustments:
Total fair value adjustments	1,779
1st Enterprise Bank \| Loans, net
Fair value adjustments:
Total fair value adjustments	-12,362
1st Enterprise Bank \| Premises and equipment
Fair value adjustments:
Total fair value adjustments	-377
1st Enterprise Bank \| Deferred taxes
Fair value adjustments:
Total fair value adjustments	3,019
1st Enterprise Bank \| Core deposits and leasehold intangibles
Fair value adjustments:
Total fair value adjustments	7,424
1st Enterprise Bank \| Other assets
Fair value adjustments:
Total fair value adjustments	-52
1st Enterprise Bank \| Other liabilities
Fair value adjustments:
Total fair value adjustments	1,989
1st Enterprise Bank \| Common Stock
Consideration paid:
CU Bancorp issued	102,712
1st Enterprise Bank \| Preferred Stock
Consideration paid:
CU Bancorp issued	$15,921

Fair_Value_of_Loans_Pursuant_t

Fair Value of Loans Pursuant to Accounting Standards for PCI and Non-PCI Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2014
Loans [Line Items]
Accretable yield	($21,402)	($7,912)	($12,189)
PCI loans
Loans [Line Items]
Accretable yield	-324	-395	-9
1st Enterprise Bank
Loans [Line Items]
Contractually required payments				569,853
Less: non-accretable difference				-108
Cash flows expected to be collected (undiscounted)				569,745
Accretable yield				-16,562
Fair value of acquired loans				553,183
1st Enterprise Bank \| PCI loans
Loans [Line Items]
Contractually required payments				577
Less: non-accretable difference				-108
Cash flows expected to be collected (undiscounted)				469
Fair value of acquired loans				469
1st Enterprise Bank \| Non-PCI loans
Loans [Line Items]
Contractually required payments				569,276
Cash flows expected to be collected (undiscounted)				569,276
Accretable yield				-16,562
Fair value of acquired loans				$552,714

Schedule_of_Pro_Forma_Informat

Schedule of Pro Forma Information (Detail) (USD $)	12 Months Ended		1 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	$2,281	$2,787
Diluted earnings per share	$0.21	$0.27
1st Enterprise Bank
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net interest income after provision for loan losses			2,023	77,140	68,771
Net income			766	17,218	15,299
Preferred stock dividends and discount accretion				-1,234	-889
Net income available to common shareholders				$15,984	$14,410
Diluted earnings per share				$0.94	$0.87

Supplemental_Pro_Forma_Financi

Supplemental Pro Forma Financial Information (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Business Combinations [Abstract]
Net interest income	$42,939	$41,529
Net income	$2,281	$2,787
Diluted earnings per share	$0.21	$0.27

Computation_of_Book_Value_and_2

Computation of Book Value and Tangible Book Value per Common Share (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Total Shareholders' Equity	$279,192	$137,924	$125,623	$80,844
Less: Preferred stock	16,004
Less: Goodwill	63,950	12,292	12,292
Less: Core deposit and leasehold right intangibles	9,547	2,525
Tangible Shareholders' Equity	$189,691	$123,107
Common shares issued and outstanding	16,683,856	11,081,364
Book value per common share	$15.78	$12.45
Tangible book value per common share	$11.37	$11.11

Basic_and_Diluted_Earnings_Per

Basic and Diluted Earnings Per Common Share Computations (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net Income	$1,307	$2,549	$2,386	$2,666	$2,832	$2,477	$2,321	$2,155	$8,908	$9,785	$1,727
Less: Preferred stock dividends and discount accretion	-124								124
Net Income Available to Common Shareholders	$1,183	$2,549	$2,386	$2,666	$2,832	$2,477	$2,321	$2,155	$8,784	$9,785	$1,727
Weighted average basic common shares outstanding									11,393,445	10,567,436	8,283,599
Dilutive effect of potential common share issuances from stock options and restricted stock									274,288	269,425	127,150
Weighted average diluted common shares outstanding									11,667,733	10,836,861	8,410,749
Basic income (loss) per share	$0.09	$0.23	$0.22	$0.25	$0.26	$0.24	$0.22	$0.21	$0.77	$0.93	$0.21
Diluted income (loss) per share	$0.09	$0.23	$0.21	$0.24	$0.26	$0.23	$0.22	$0.20	$0.75	$0.90	$0.21
Anti-dilutive shares not included in the calculation of diluted earnings per share									79,000	81,000	245,833

Amortized_Cost_and_Estimated_F

Amortized Cost and Estimated Fair Values of Investment Securities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	$226,634	$106,836
Available-for-sale Securities, Gross Unrealized Gains	1,573	1,535
Available-for-sale Securities, Gross Unrealized Losses	1,245	1,883
Estimated Fair Value	226,962	106,488
Held-to-maturity Securities, Amortized Cost	47,147
Held-to-maturity Securities, Gross Unrealized Gain	169
Held-to-maturity Securities, Gross Unrealized Losses	157
Estimated Fair Value	47,159
Available-for-sale Securities and Held-to-maturity Securities, Amortized Cost	273,781	106,836
Available-for-sale Securities and Held-to-maturity Securities, Gross Unrealized Gain	1,742	1,535
Available-for-sale Securities and Held-to-maturity Securities, Gross Unrealized Losses	1,402	1,883
Available-for-sale Securities and Held-to-maturity Securities, Estimated Fair Value	274,121	106,488
Municipal Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	1,039	3,621
Available-for-sale Securities, Gross Unrealized Gains	11	9
Available-for-sale Securities, Gross Unrealized Losses		2
Estimated Fair Value	1,050	3,628
Held-to-maturity Securities, Amortized Cost	47,147
Held-to-maturity Securities, Gross Unrealized Gain	169
Held-to-maturity Securities, Gross Unrealized Losses	157
Estimated Fair Value	47,159
U.S. Govt Agency - GNMA Mortgage-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	29,364	28,107
Available-for-sale Securities, Gross Unrealized Gains	255	180
Available-for-sale Securities, Gross Unrealized Losses	277	909
Estimated Fair Value	29,342	27,378
Corporate Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	4,043	5,086
Available-for-sale Securities, Gross Unrealized Gains	77	125
Estimated Fair Value	4,120	5,211
Asset Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	8,711
Available-for-sale Securities, Gross Unrealized Gains	1
Available-for-sale Securities, Gross Unrealized Losses	40
Estimated Fair Value	8,672
U. S. Treasury Notes
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	20,031
Available-for-sale Securities, Gross Unrealized Losses	6
Estimated Fair Value	20,025
U.S. Govt Agency and Sponsored Agency - Note Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	2,036	4,153
Available-for-sale Securities, Gross Unrealized Gains	2	1
Available-for-sale Securities, Gross Unrealized Losses		2
Estimated Fair Value	2,038	4,152
U.S. Govt Agency - SBA Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	54,062	50,521
Available-for-sale Securities, Gross Unrealized Gains	770	875
Available-for-sale Securities, Gross Unrealized Losses	345	491
Estimated Fair Value	54,487	50,905
U.S. Govt Sponsored Agency - CMO & Mortgage-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	107,348	15,348
Available-for-sale Securities, Gross Unrealized Gains	457	345
Available-for-sale Securities, Gross Unrealized Losses	577	479
Estimated Fair Value	$107,228	$15,214

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities classified as other-than-temporarily impaired	$0	$0
Gain on sale of securities, net	-47,000	47,000	0
Net proceeds from sale of securities	25,156,000	6,968,000	17,278,000
Company's investment in the common stock of the FHLB	8,000,000	4,700,000
Capital stock redemption		-150,000	-866,000
Other-than-temporary impairment losses	0		155,000
Securities Sold under Agreements to Repurchase
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of securities pledged to secure securities sold under agreements to repurchase	89,300,000	53,980,000
PC Bancorp
Schedule of Trading Securities and Other Trading Assets [Line Items]
Acquired common stock of FHLB	3,800,000
Capital stock redemption	0	150,300
San Francisco
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cash dividends received	$320,000	$199,000

Investment_Securities_with_Unr

Investment Securities with Unrealized Losses that are Considered to be Temporarily Impaired (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	$112,706	$36,070
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Net Unrealized Loss	611	1,693
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	25,463	2,893
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Net Unrealized Loss	634	190
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	138,169	38,963
Temporarily-impaired available-for-sale investment securities, Total, Net Unrealized Loss	1,245	1,883
Temporarily-impaired held-to-maturity investment securities, Less than 12 months, Fair Value	23,966
Temporarily-impaired held-to-maturity investment securities, Less than 12 months, Net Unrealized Loss	157
Temporarily-impaired held-to-maturity investment securities, More than 12 months, Fair Value	0
Temporarily-impaired held-to-maturity investment securities, More than 12 months, Net Unrealized Loss	0
Temporarily-impaired held-to-maturity investment securities, Fair Value	23,966
Temporarily-impaired held-to-maturity investment securities, Net Unrealized Loss	157
U.S. Govt Agency - GNMA Mortgage-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	12,784	15,693
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Net Unrealized Loss	65	721
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	8,784	1,864
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Net Unrealized Loss	212	188
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	21,568	17,557
Temporarily-impaired available-for-sale investment securities, Total, Net Unrealized Loss	277	909
Asset Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	4,849
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Net Unrealized Loss	40
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	4,849
Temporarily-impaired available-for-sale investment securities, Total, Net Unrealized Loss	40
U. S. Treasury Notes
Schedule of Available-for-sale Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	20,025
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Net Unrealized Loss	6
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	20,025
Temporarily-impaired available-for-sale investment securities, Total, Net Unrealized Loss	6
Municipal Securities
Schedule of Available-for-sale Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value		1,029
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Net Unrealized Loss		2
Temporarily-impaired available-for-sale investment securities, Total, Fair Value		1,029
Temporarily-impaired available-for-sale investment securities, Total, Net Unrealized Loss		2
Temporarily-impaired held-to-maturity investment securities, Less than 12 months, Fair Value	23,966
Temporarily-impaired held-to-maturity investment securities, Less than 12 months, Net Unrealized Loss	157
Temporarily-impaired held-to-maturity investment securities, More than 12 months, Fair Value	0
Temporarily-impaired held-to-maturity investment securities, More than 12 months, Net Unrealized Loss	0
Temporarily-impaired held-to-maturity investment securities, Fair Value	23,966
Temporarily-impaired held-to-maturity investment securities, Net Unrealized Loss	157
U.S. Govt Agency and Sponsored Agency - Note Securities
Schedule of Available-for-sale Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value		1,041
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Net Unrealized Loss		2
Temporarily-impaired available-for-sale investment securities, Total, Fair Value		1,041
Temporarily-impaired available-for-sale investment securities, Total, Net Unrealized Loss		2
U.S. Govt Agency - SBA Securities
Schedule of Available-for-sale Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	10,688	11,686
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Net Unrealized Loss	87	491
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	10,095
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Net Unrealized Loss	258
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	20,783	11,686
Temporarily-impaired available-for-sale investment securities, Total, Net Unrealized Loss	345	491
U.S. Govt Sponsored Agency - CMO & Mortgage-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Fair Value	64,360	7,650
Temporarily-impaired available-for-sale investment securities, Less than 12 Continuous Months, Net Unrealized Loss	413	479
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Fair Value	6,584
Temporarily-impaired available-for-sale investment securities, More than 12 Continuous Months, Net Unrealized Loss	164
Temporarily-impaired available-for-sale investment securities, Total, Fair Value	70,944	7,650
Temporarily-impaired available-for-sale investment securities, Total, Net Unrealized Loss	$577	$479

Maturities_Schedule_of_Securit

Maturities Schedule of Securities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Due through one year, Amortized Cost	$28,307	$17,574
Due after one year through five years, Amortized Cost	109,021	37,733
Due after five years through ten years, Amortized Cost	62,641	25,486
Due after ten years, Amortized Cost	26,665	26,043
Available-for-sale Securities, Amortized Cost	226,634	106,836
Due through one year, Fair Value	28,467	17,759
Due after one year through five years, Fair Value	109,245	38,168
Due after five years through ten years, Fair Value	62,389	24,952
Due after ten years, Fair Value	26,861	25,609
Fair Market Value	$226,962	$106,488
Due through one year, Weighted Average Yield	1.73%	1.69%
Due after one year through five years, Weighted Average Yield	1.65%	2.04%
Due after five years through ten years, Weighted Average Yield	1.91%	2.41%
Due after ten years, Weighted Average Yield	2.55%	2.75%
Total, Weighted Average Yield	1.83%	2.24%

Composition_of_Loan_Portfolio_

Composition of Loan Portfolio (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loans Receivable [Line Items]
Commercial and Industrial Loans:	$528,517	$299,473
Loans Secured by Real Estate:
Loans Secured by Real Estate	1,067,847	615,988
Other Loans:	28,359	17,733
Total Loans	1,624,723	933,194
Owner-Occupied Nonresidential Properties
Loans Secured by Real Estate:
Loans Secured by Real Estate	339,309	197,605
Other Nonresidential Properties
Loans Secured by Real Estate:
Loans Secured by Real Estate	481,517	271,818
Construction, Land Development and Other Land
Loans Secured by Real Estate:
Loans Secured by Real Estate	72,223	47,074
Total Loans	72,223	47,074
1-4 Family Residential Properties
Loans Secured by Real Estate:
Loans Secured by Real Estate	121,985	65,711
Multifamily Residential Properties
Loans Secured by Real Estate:
Loans Secured by Real Estate	$52,813	$33,780

Loans_Additional_Information_D

Loans - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014
	Loan	Loan	Dec. 31, 2014
Loans Receivable [Line Items]
Loan to value ratio	75.00%		75.00%
Loans held for sale	$0	$0	0
Unfunded loan commitments	719,600,000	345,900,000	719,600,000
Allowance for losses on unfunded loan commitments	471,000	329,000	471,000
Credit impaired notes	1,620,035,000	923,397,000	1,620,035,000
Credit purchase impaired loan	2,400,000	4,300,000
Recorded Investment	2,651,000	6,320,000	2,651,000
Unpaid Principal Balance	2,894,000	11,814,000	2,894,000
Number of Loans	2	1
SBA Servicing Asset
Loans Receivable [Line Items]
Total loans	3,800,000		3,800,000
Loans sold	72,200,000		72,200,000
SBA Servicing Asset \| PC Bancorp
Loans Receivable [Line Items]
Total loans	107,400,000		107,400,000
SBA 7a Loans
Loans Receivable [Line Items]
Total loans	5,000,000		5,000,000
PCI loans
Loans Receivable [Line Items]
Credit Impaired Loans	1,300,000	3,200,000	1,300,000
Credit impaired notes	1,100,000	1,100,000	1,100,000
Troubled Debt Restructuring
Loans Receivable [Line Items]
Recorded Investment	644,000	2,714,000	644,000
Unpaid Principal Balance	834,000	3,628,000	834,000
Troubled Debt Restructuring \| PCI loans
Loans Receivable [Line Items]
Recorded Investment	204,000		204,000
Unpaid Principal Balance	384,000		384,000
Number of Loans	2
Secured Commercial Loan \| Real Estate Collateral Dependent Loans
Loans Receivable [Line Items]
Loan concentration percentage			66.00%
Secured Commercial Loan \| First Trust Deed Lien
Loans Receivable [Line Items]
Loan concentration percentage			94.00%
Secured Commercial Loan \| Second Trust Deed Lien
Loans Receivable [Line Items]
Loan concentration percentage			6.00%
Secured Commercial Loan \| Owner-Occupied Nonresidential Properties
Loans Receivable [Line Items]
Loan concentration percentage			32.00%
Secured Commercial Loan \| Business property
Loans Receivable [Line Items]
Loan concentration percentage	25.00%		25.00%
Unsecured Commercial Loan
Loans Receivable [Line Items]
Loan concentration percentage			7.00%
Debt Instrument Remaining Loans \| SBA Servicing Asset
Loans Receivable [Line Items]
Total loans	35,200,000		35,200,000
Debt Instrument Not Guaranteed Loans \| SBA Servicing Asset
Loans Receivable [Line Items]
Total loans	24,100,000		24,100,000
Debt Instrument Guaranteed Loans \| SBA Servicing Asset
Loans Receivable [Line Items]
Total loans	$11,100,000		11,100,000

Companys_Gross_Loans_Stratifie

Company's Gross Loans Stratified by Industry Concentration of Borrower (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loans Receivable [Line Items]
Total Loans	$1,624,723	$933,194
Real Estate
Loans Receivable [Line Items]
Total Loans	744,663	381,830
Manufacturing
Loans Receivable [Line Items]
Total Loans	161,233	83,319
Wholesale
Loans Receivable [Line Items]
Total Loans	124,336	60,291
Construction
Loans Receivable [Line Items]
Total Loans	113,763	62,835
Finance
Loans Receivable [Line Items]
Total Loans	96,074	46,393
Hotel/Lodging
Loans Receivable [Line Items]
Total Loans	88,269	76,143
Professional Services
Loans Receivable [Line Items]
Total Loans	64,215	49,739
Other Services
Loans Receivable [Line Items]
Total Loans	45,781	21,448
Healthcare
Loans Receivable [Line Items]
Total Loans	43,917	38,662
Retail
Loans Receivable [Line Items]
Total Loans	35,503	23,157
Administrative Management
Loans Receivable [Line Items]
Total Loans	28,016	15,218
Restaurant/Food Service
Loans Receivable [Line Items]
Total Loans	24,525	35,244
Transportation
Loans Receivable [Line Items]
Total Loans	18,158	9,531
Information
Loans Receivable [Line Items]
Total Loans	15,457	11,709
Education
Loans Receivable [Line Items]
Total Loans	10,253	10,270
Entertainment
Loans Receivable [Line Items]
Total Loans	8,284	6,207
Other
Loans Receivable [Line Items]
Total Loans	$2,276	$1,198

Summary_of_Activity_for_Allowa

Summary of Activity for Allowance for Loan Loss (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Allowance for loan loss at beginning of year				$10,603				$8,803	$10,603	$8,803	$7,495
Provision for loan losses	1,721	35	408	75	934	631	1,153	134	2,239	2,852	1,768
Net (charge-offs) recoveries:
Charge-offs									-692	-1,912	-687
Recoveries									460	860	227
Net (charge-offs) recoveries									-232	-1,052	-460
Allowance for loan loss at end of year	$12,610				$10,603				$12,610	$10,603	$8,803
Net (charge-offs) recoveries to average loans									-0.02%	-0.12%	-0.08%
Allowance for loan loss to total loans	0.78%				1.14%				0.78%	1.14%	1.03%
Allowance for loan loss to total loans accounted for at historical cost, which excludes purchased loans acquired by acquisition									1.39%	1.50%	1.54%

Changes_in_Allowance_for_Loan_

Changes in Allowance for Loan Loss (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of year				$10,603				$8,803	$10,603	$8,803	$7,495
Provision for loan losses	1,721	35	408	75	934	631	1,153	134	2,239	2,852	1,768
Net (charge-offs) recoveries:
Charge-offs									-692	-1,912	-687
Recoveries									460	860	227
Total net (charge-offs) recoveries									-232	-1,052	-460
Allowance for loan loss at end of year	12,610				10,603				12,610	10,603	8,803
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of year				5,534				4,572	5,534	4,572
Provision for loan losses									595	2,596
Net (charge-offs) recoveries:
Charge-offs									-619	-1,704
Recoveries									354	70
Total net (charge-offs) recoveries									-265	-1,634
Allowance for loan loss at end of year	5,864				5,534				5,864	5,534
Construction, Land Development and Other Land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of year				1,120				2,035	1,120	2,035
Provision for loan losses									564	-1,678
Net (charge-offs) recoveries:
Recoveries										763
Total net (charge-offs) recoveries										763
Allowance for loan loss at end of year	1,684				1,120				1,684	1,120
Commercial and Other Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of year				3,886				2,084	3,886	2,084
Provision for loan losses									883	1,990
Net (charge-offs) recoveries:
Charge-offs									-73	-200
Recoveries									106	12
Total net (charge-offs) recoveries									33	-188
Allowance for loan loss at end of year	4,802				3,886				4,802	3,886
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan loss at beginning of year				63				112	63	112
Provision for loan losses									197	-56
Net (charge-offs) recoveries:
Charge-offs										-8
Recoveries										15
Total net (charge-offs) recoveries										7
Allowance for loan loss at end of year	$260				$63				$260	$63

Schedule_Represents_both_Allow

Schedule Represents both Allowance for Loan Loss and Associated Loan Balance Classified by Loan Portfolio Segment and by Credit Evaluation Methodology (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$222	$4
Collectively evaluated for impairment	12,388	10,589
Purchased credit impaired (loans acquired with deteriorated credit quality)		10
Total Allowance for Loan Loss	12,610	10,603	8,803	7,495
Loans receivable:
Individually evaluated for impairment	2,651	6,320
Collectively evaluated for impairment	1,619,687	922,546
Purchased credit impaired (loans acquired with deteriorated credit quality)	2,385	4,328
Total Loans	1,624,723	933,194
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	222	4
Collectively evaluated for impairment	5,642	5,520
Purchased credit impaired (loans acquired with deteriorated credit quality)		10
Total Allowance for Loan Loss	5,864	5,534	4,572
Loans receivable:
Individually evaluated for impairment	1,914	2,640
Collectively evaluated for impairment	525,910	295,787
Purchased credit impaired (loans acquired with deteriorated credit quality)	693	1,046
Total Loans	528,517	299,473
Construction, Land Development and Other Land
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1,684	1,120
Total Allowance for Loan Loss	1,684	1,120	2,035
Loans receivable:
Collectively evaluated for impairment	72,223	47,074
Total Loans	72,223	47,074
Commercial and Other Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	4,802	3,886
Total Allowance for Loan Loss	4,802	3,886	2,084
Loans receivable:
Individually evaluated for impairment	737	3,680
Collectively evaluated for impairment	993,195	561,952
Purchased credit impaired (loans acquired with deteriorated credit quality)	1,692	3,282
Total Loans	995,624	568,914
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	260	63
Total Allowance for Loan Loss	260	63	112
Loans receivable:
Collectively evaluated for impairment	28,359	17,733
Total Loans	$28,359	$17,733

Risk_Category_of_Loans_by_Clas

Risk Category of Loans by Class of Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loans Receivable [Line Items]
Commercial and Industrial	$528,517	$299,473
Construction, Land Development and Other Land	72,223	47,074
Commercial and Other Real Estate	995,624	568,914
Other	28,359	17,733
Total Loans	1,624,723	933,194
Pass
Loans Receivable [Line Items]
Commercial and Industrial	502,624	289,594
Construction, Land Development and Other Land	72,223	47,074
Commercial and Other Real Estate	977,525	547,600
Other	28,358	17,731
Total Loans	1,580,730	901,999
Special Mention
Loans Receivable [Line Items]
Commercial and Industrial	8,738	1,540
Commercial and Other Real Estate	4,878	2,613
Total Loans	13,616	4,153
Substandard
Loans Receivable [Line Items]
Commercial and Industrial	17,155	8,339
Commercial and Other Real Estate	13,221	18,701
Other	1	2
Total Loans	$30,377	$27,042

Aging_Analysis_of_Recorded_Inv

Aging Analysis of Recorded Investment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loans Receivable [Line Items]
31-60 Days Past Due	$546
61-90 Days Past Due	233	241
Greater than 90 Days Past Due and Accruing	0
Total Past Due and Accruing	779	241
Total Non Accrual	3,909	9,556
Current	1,620,035	923,397
Total Loans	1,624,723	933,194
Commercial and Industrial
Loans Receivable [Line Items]
31-60 Days Past Due	192
61-90 Days Past Due	233	241
Total Past Due and Accruing	425	241
Total Non Accrual	2,604	3,682
Current	525,488	295,550
Total Loans	528,517	299,473
Construction, Land Development and Other Land
Loans Receivable [Line Items]
Current	72,223	47,074
Total Loans	72,223	47,074
Commercial and Other Real Estate
Loans Receivable [Line Items]
31-60 Days Past Due	354
Total Past Due and Accruing	354
Total Non Accrual	1,305	5,874
Current	993,965	563,040
Total Loans	995,624	568,914
Other
Loans Receivable [Line Items]
Current	28,359	17,733
Total Loans	$28,359	$17,733

Recorded_Investment_and_Unpaid

Recorded Investment and Unpaid Principal Balances for Impaired Loans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Related Allowance, With a specific allowance recorded	$222,000	$4,000
Related Allowance	222,000	4,000
Recorded Investment	2,651,000	6,320,000
Unpaid Principal Balance	2,894,000	11,814,000
Related Allowance	222,000	4,000
Average Recorded Investment	4,991,000	7,067,000
Interest Income Recognized	0	0
Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	520,000	2,540,000
Unpaid Principal Balance, With no specific allowance recorded	609,000	5,347,000
Related Allowance, With a specific allowance recorded	222,000	4,000
Average Recorded Investment, With no specific allowance recorded	869,000	1,835,000
Interest Income Recognized, With no specific allowance recorded	0	0
Recorded Investment, With a specific allowance recorded	1,394,000	100,000
Unpaid Principal Balance, With a specific allowance recorded	1,546,000	355,000
Related Allowance	222,000	4,000
Average Recorded Investment, With a specific allowance recorded	1,428,000	137,000
Interest Income Recognized, With a specific allowance recorded	0	0
Recorded Investment	1,914,000	2,640,000
Unpaid Principal Balance	2,155,000	5,702,000
Related Allowance	222,000	4,000
Average Recorded Investment	2,297,000	1,972,000
Interest Income Recognized	0	0
Construction, Land Development and Other Land
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, With no specific allowance recorded		879,000
Interest Income Recognized, With no specific allowance recorded		0
Average Recorded Investment		879,000
Interest Income Recognized		0
Commercial and Other Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	737,000	3,680,000
Unpaid Principal Balance, With no specific allowance recorded	739,000	6,112,000
Average Recorded Investment, With no specific allowance recorded	1,058,000	4,216,000
Interest Income Recognized, With no specific allowance recorded	0	0
Recorded Investment	737,000	3,680,000
Unpaid Principal Balance	739,000	6,112,000
Average Recorded Investment	1,058,000	4,216,000
Interest Income Recognized	$0	$0

Additional_Information_on_Impa

Additional Information on Impaired Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Average recorded investment in impaired loans	$4,991	$7,067
Interest foregone on impaired loans	421	710
Cash collections applied to reduce principal balance	3,014	5,057
Interest income recognized on cash collections	$0	$0

Recorded_Investment_and_Unpaid1

Recorded Investment and Unpaid Principal Balances for TDR Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Recorded Investment	$2,651,000	$6,320,000
Unpaid Principal Balance	2,894,000	11,814,000
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,914,000	2,640,000
Unpaid Principal Balance	2,155,000	5,702,000
Commercial and Other Real Estate
Financing Receivable, Modifications [Line Items]
Recorded Investment	737,000	3,680,000
Unpaid Principal Balance	739,000	6,112,000
Troubled Debt Restructuring
Financing Receivable, Modifications [Line Items]
Recorded Investment	644,000	2,714,000
Unpaid Principal Balance	834,000	3,628,000
Interest Income Recognized	0	0
Troubled Debt Restructuring \| Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Recorded Investment	530,000	541,000
Unpaid Principal Balance	719,000	843,000
Interest Income Recognized	0	0
Troubled Debt Restructuring \| Commercial and Other Real Estate
Financing Receivable, Modifications [Line Items]
Recorded Investment	114,000	2,173,000
Unpaid Principal Balance	115,000	2,785,000
Interest Income Recognized	$0	$0

Pre_and_Post_Modification_Reco

Pre and Post Modification Recorded Investment in TDR Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	Loan	Loan
Financing Receivable, Modifications [Line Items]
Number of Loans	2	1
Pre-Modification Recorded Investment	$338	$310
Post-Modification Recorded Investment	338	310
Reduced Interest Rate \| Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1
Pre-Modification Recorded Investment	224	310
Post-Modification Recorded Investment	224	310
Reduced Interest Rate \| Commercial and Other Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Recorded Investment	114
Post-Modification Recorded Investment	$114

Accretable_Yield_for_Loans_Acq

Accretable Yield for Loans Acquired (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Balance, beginning of year	$7,912	$12,189
Accretion, included in interest income	-3,023	-3,754
Additions, due to acquisition	16,562
Sold acquired loans	0	0
Reclassifications to non-accretable yield	-49	-523
Balance, end of year	$21,402	$7,912

Carrying_Value_of_Purchased_Cr

Carrying Value of Purchased Credit Impaired Loans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Outstanding [Line Items]
Unpaid Principal Balance	$2,894,000	$11,814,000
Carrying Value	2,651,000	6,320,000
PCI loans
Debt Outstanding [Line Items]
Unpaid Principal Balance	4,285,000	7,210,000
Carrying Value	2,385,000	4,328,000
PCI loans \| Commercial and Industrial
Debt Outstanding [Line Items]
Unpaid Principal Balance	1,205,000	1,599,000
Carrying Value	693,000	1,046,000
PCI loans \| Commercial and Other Real Estate
Debt Outstanding [Line Items]
Unpaid Principal Balance	3,018,000	5,611,000
Carrying Value	1,692,000	3,282,000
PCI loans \| Other
Debt Outstanding [Line Items]
Unpaid Principal Balance	$62,000

Accretable_Net_Discount_of_Pur

Accretable Net Discount of Purchased Credit Impaired Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Acquired Impaired Loans Change In Accretable Yield [Line Items]
Balance, beginning of year	$7,912	$12,189
Accretion, included in interest income	-3,023	-3,754
Balance, end of year	21,402	7,912
PCI loans
Acquired Impaired Loans Change In Accretable Yield [Line Items]
Balance, beginning of year	395	9
Accretion, included in interest income	-71	-33
Reclassifications from non-accretable yield		419
Balance, end of year	$324	$395

Summary_of_Premises_and_Equipm

Summary of Premises and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment, Net [Abstract]
Furniture and equipment	$8,489	$5,252
Leasehold improvements	7,009	6,730
Total	15,498	11,982
Less: Accumulated depreciation and amortization	-10,121	-8,451
Total	$5,377	$3,531

Premises_and_Equipment_and_Lea2

Premises and Equipment and Lease Commitments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment, Net [Abstract]
Depreciation	$1,019,000	$1,082,000	$1,022,000
Rental expense on facilities	$2,200,000	$2,200,000	$1,800,000

Future_Minimum_Lease_Payments_

Future Minimum Lease Payments for Operating Leases for Office and Branch Space Based Upon Obligations (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	$3,186
2016	3,034
2017	2,981
2018	2,162
2019	2,006
Thereafter	6,066
Total	$19,435

Goodwill_Core_Deposit_and_Leas2

Goodwill, Core Deposit and Leasehold Right Intangibles - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2014
Goodwill And Intangible Assets [Line Items]
Goodwill	$63,950,000	$63,950,000	$12,292,000	$12,292,000
Goodwill acquisition during period		51,658,000
Goodwill, impairment	0	0	0
Weighted average amortization period		7 years 2 months 12 days
Estimated amortization expense, One	1,700,000	1,700,000
Estimated amortization expense, Two	1,300,000	1,300,000
Estimated amortization expense, Three	1,100,000	1,100,000
Estimated amortization expense, Four	936,000	936,000
Estimated amortization expense, Five	692,000	692,000
Amortization on leasehold right intangibles		142,000	-313,000	-315,000
Leasehold Right Intangibles
Goodwill And Intangible Assets [Line Items]
Leasehold right intangibles	1,400,000	1,400,000
Amortization on leasehold right intangibles		142,000	313,000	315,000
1st Enterprise Bank
Goodwill And Intangible Assets [Line Items]
Goodwill	51,700,000	51,700,000			51,658,000
Goodwill acquisition during period		51,700,000
Leasehold right intangibles	$390,000	$390,000

Schedule_of_Changes_in_Carryin

Schedule of Changes in Carrying Value of Goodwill (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Balance, beginning of year		$12,292,000	$12,292,000
Goodwill acquired during the year		51,658,000
Impairment losses	0	0	0
Balance, end of year	63,950,000	63,950,000	12,292,000
Accumulated impairment losses at end of year	$0	$0	$0

Changes_in_Gross_Amounts_of_Co

Changes in Gross Amounts of Core Deposit Intangibles and Related Accumulated Amortization (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Amortization:
Amortization	($142,000)	$313,000	$315,000
Core Deposit Intangible
Gross amount of CDI:
Balance, beginning of year	2,103,000	2,103,000	1,098,000
Additions due to acquisitions	7,143,000	0	1,005,000
Balance, end of year	9,246,000	2,103,000	2,103,000
Accumulated Amortization:
Balance, beginning of year	-665,000	-356,000	-137,000
Amortization	-391,000	-309,000	-219,000
Balance, end of year	-1,056,000	-665,000	-356,000
Net CDI, end of year	$8,190,000	$1,438,000	$1,747,000

Bank_Owned_Life_Insurance_Addi

Bank Owned Life Insurance - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Entity	Dec. 31, 2013	Dec. 31, 2012
Insurance [Line Items]
Bank-Owned Life Insurance, holding amount	$38,732,000	$21,200,000
Non-interest income on BOLI policies	661,000	617,000	267,000
Increase in cash surrender values on policies	17,500,000	617,000
Number of insurance companies	7
Maximum
Insurance [Line Items]
Bank-Owned Life Insurance balances, outstanding percentage	32.00%
Minimum
Insurance [Line Items]
Bank-Owned Life Insurance balances, outstanding percentage	1.00%
1st Enterprise Bank
Insurance [Line Items]
Increase in cash surrender values on policies	618,000
Holding amount, result of acquisition	$16,900,000

Investment_in_California_Organ1

Investment in California Organized Investment Network ("COIN") - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2009
	Dec. 31, 2014	Investment	Investment
Investment [Line Items]
Investment with Clearinghouse		$1,100,000	$1,000,000
Investment period		60 months	60 months
Interest rate of investment		0.00%	0.00%
Amount qualified for Investment Tax Credit	516,000	640,000	200,000
Number of investment		2	1
Investment qualification for income tax credit as a percentage		20.00%
Maturity year of the Investment		2018	2014
Rural Community Assistance Corporation
Investment [Line Items]
Investment with Clearinghouse		1,000,000
Interest rate of investment		0.00%
Amount qualified for Investment Tax Credit		200,000
Pacific Coast Regional Small Business Development Corporation
Investment [Line Items]
Investment with Clearinghouse		75,000
Amount qualified for Investment Tax Credit		$15,000

Qualified_Affordable_Housing_P2

Qualified Affordable Housing Project Investments - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Investment cost	$4,141	$4,510
Investment in funding obligation	2,482	3,990
Low Income Housing Tax Credits
Investment Holdings [Line Items]
Investment cost	4,100
Investment in funding obligation	$2,500
Investment benefits in years	10 years
Minimum \| Low Income Housing Tax Credits
Investment Holdings [Line Items]
Return in investment	5.00%
Maximum \| Low Income Housing Tax Credits
Investment Holdings [Line Items]
Return in investment	6.00%

Schedule_of_Companys_Original_

Schedule of Company's Original Investment in Affordable Housing Project (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2009
Investment Holdings [Line Items]
Original Investment Value	$5,050,000	$5,050,000
Current Recorded Investment	4,141,000	4,510,000
Unfunded Liability Obligation	2,482,000	3,990,000
Tax Credits and Benefits	516,000	640,000	200,000
Amortization of Investments	370,000	485,000
Net Income Tax Benefit	146,000	155,000
Enterprise Green Communities West II LP
Investment Holdings [Line Items]
Original Investment Value	1,000,000	1,000,000
Current Recorded Investment	704,000	787,000
Unfunded Liability Obligation	162,000	190,000
Tax Credits and Benefits	127,000	236,000
Amortization of Investments	84,000	160,000
Net Income Tax Benefit	43,000	76,000
Enterprise Housing Partners Calgreen II Fund LP
Investment Holdings [Line Items]
Original Investment Value	2,050,000	2,050,000
Current Recorded Investment	1,588,000	1,735,000
Unfunded Liability Obligation	635,000	1,817,000
Tax Credits and Benefits	229,000	390,000
Amortization of Investments	174,000	314,000
Net Income Tax Benefit	55,000	76,000
Enterprise Housing Partners XXIV LP
Investment Holdings [Line Items]
Original Investment Value	2,000,000	2,000,000
Current Recorded Investment	1,849,000	1,988,000
Unfunded Liability Obligation	1,685,000	1,983,000
Tax Credits and Benefits	160,000	14,000
Amortization of Investments	112,000	11,000
Net Income Tax Benefit	$48,000	$3,000

Schedule_of_Anticipated_Income

Schedule of Anticipated Income Tax Benefit that is Expected to be Recognized (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Schedule of Investments [Line Items]
2015	$140
2016	137
2017 and thereafter	963
Total - anticipated net income tax benefit in Qualified Affordable Housing Projects	1,240
Enterprise Green Communities West II LP
Schedule of Investments [Line Items]
2015	44
2016	43
2017 and thereafter	245
Total - anticipated net income tax benefit in Qualified Affordable Housing Projects	332
Enterprise Housing Partners Calgreen II Fund LP
Schedule of Investments [Line Items]
2015	43
2016	39
2017 and thereafter	304
Total - anticipated net income tax benefit in Qualified Affordable Housing Projects	386
Enterprise Housing Partners XXIV LP
Schedule of Investments [Line Items]
2015	53
2016	55
2017 and thereafter	414
Total - anticipated net income tax benefit in Qualified Affordable Housing Projects	$522

Deposits_Additional_Informatio

Deposits - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Customer	Dec. 31, 2013
Deposits [Line Items]
Number of customers who maintained balances	84
Aggregate Deposits	$859,200,000
Percentage of customer maintained balances out of total deposit base	44.00%
Amount of time deposits	64,800,000
Amount of Time Deposits maturing in one year	62,900,000
Maturity of time deposits	1 year
Certificates of deposit with balances $100,000 or more	60,735,000	59,000,000
Certificates of deposit with balances $250,000 or more	19,600,000	20,500,000
Deposits	76,433,000	60,307,000
Aggregating all related accounts, including multiple business entities and personal funds of business owners \| Minimum
Deposits [Line Items]
Aggregate Deposits	4,000,000
Insured Cash Sweep
Deposits [Line Items]
Deposits	12,400,000
Certificate Of Deposit Account Registry Service
Deposits [Line Items]
Deposits	$29,900,000	$28,900,000

Deposits_Schedule_of_Maturity_

Deposits - Schedule of Maturity of Time Deposits (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Time Deposits [Abstract]
Three months or less	$10,376
Over three through six months	16,476
Over six through twelve months	32,278
Over twelve months	1,605
Total	$60,735	$59,000

Deposits_Schedule_of_Maturity_1

Deposits - Schedule of Maturity of Time Deposits (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Maturities For Total Time Deposits [Line Items]
Time Deposits of $100,000 or more	$60,735	$59,000
Certificate Of Deposit Account Registry Service
Schedule Of Maturities For Total Time Deposits [Line Items]
Time Deposits of $100,000 or more	$29,400

Borrowings_and_Subordinated_De2

Borrowings and Subordinated Debentures - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Borrowings [Line Items]
Securities with a fair market value	$32,300,000	$11,800,000
Credit facility, percentage of Bank's total assets			25.00%
Credit facility, maximum borrowing capacity			362,600,000
Credit facility, loan collateral pledge	700,000,000
Credit facility borrowings collateral amount	463,000,000
Investment securities pledged with FHLB	23,300,000
Outstanding advances (borrowings) with FHLB	0	0
FHLB Borrowings	0	0
Common stock of FHLB	8,000,000	4,700,000
Current value of FHLB common stock	8,000,000
Maximum advances by FHLB	170,500,000
Repurchased amount	0	150,300
Issuance maturity period from its date of issue	30 years
Subordinated debentures, fair value	3,300,000
Subordinated debentures, amortization expense	159,000	209,700
Estimated annual amortization expense on subordinate debenture	159,000
Trust preferred securities tier one capital	25.00%
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.
Trust I
Borrowings [Line Items]
Prepayment penalties	0
Trust II
Borrowings [Line Items]
Prepayment penalties	0
Trust III
Borrowings [Line Items]
Prepayment penalties	0
Subordinated debentures
Borrowings [Line Items]
Remaining maturity period	21 years
1st Enterprise Bank
Borrowings [Line Items]
Acquisition of FHLB capital stock	3,800,000
PC Bancorp
Borrowings [Line Items]
Subordinated debentures	12,400,000
Minimum
Borrowings [Line Items]
Repurchase maturity date	1 day
Maximum
Borrowings [Line Items]
Repurchase maturity date	180 days
Short-term borrowings	$15,700,000	$30,000,000

Terms_and_Maturity_of_Banks_Se

Terms and Maturity of Bank's Securities Sold under Agreements (Detail) (USD $)	12 Months Ended	1 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount	$9,411	$11,141
Interest Rate	0.20%
31-Dec-14
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount	9,411
Term	2 days
Maturity Date	2-Jan-15
December 31, 2014 \| Minimum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest Rate	0.13%
December 31, 2014 \| Maximum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest Rate	0.25%
3-Dec-13
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount		750
Interest Rate		0.10%
Term		62 days
Maturity Date		3-Feb-14
31-Dec-13
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount		$10,391
Interest Rate		0.30%
Term		2 days
Maturity Date		2-Jan-14
December 31, 2013 \| Minimum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest Rate		0.10%
December 31, 2013 \| Maximum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest Rate		0.40%

Subordinated_Debentures_Outsta

Subordinated Debentures Outstanding (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Instruments Owned and Pledged as Collateral [Line Items]
Unamortized fair value adjustment	($2,834)
Amount	9,538	9,379
Carrying (Reported) Amount, Fair Value Disclosure
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount	12,372	9,379
Trust I
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount	6,186
Issuance Date	10-Dec-04
Maturity Date	3/15/35
Rate Index	3 month LIBOR+2.05%
Current Rate	2.29%
Next Reset Date	17-Mar-15
Trust II
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount	3,093
Issuance Date	23-Dec-05
Maturity Date	3/15/36
Rate Index	3 month LIBOR+1.75%
Current Rate	1.99%
Next Reset Date	17-Mar-15
Trust III
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount	$3,093
Issuance Date	30-Jun-06
Maturity Date	9/15/36
Rate Index	3 month LIBOR+1.85%
Current Rate	2.09%
Next Reset Date	17-Mar-15

ShortTerm_Borrowings_Detail

Short-Term Borrowings (Detail) (Securities sold under agreements to repurchase, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Balance	$9,411	$11,141
Average Balance	$13,579	$24,376
Weighted Average Rate	25.00%	30.00%

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Agreement
	Derivative
Derivative [Line Items]
Total notional amount of swaps	$29,300,000
Number of pay-fixed, receive-variable interest rate swap agreements	22
Number of hedging relationships	22
Outstanding swaps original maturity period	15 years
Certificates of deposit with other financial institutions pledged	2,700,000
Investment securities	274,109,000	106,488,000
Non-interest bearing balances	1,700,000
Due from bank	5,500,000
Interest rate swap contracts fair value
Derivative [Line Items]
Swap contracts acquired	24
Acquisition of interest rate swap contracts	31-Jul-12
Number of interest rate swap contracts outstanding	22
Investment securities	1,100,000
Interest Rate Swaption
Derivative [Line Items]
Pledged collateral with interest rate swap counterparty bank	4,100,000
1st Enterprise Bank
Derivative [Line Items]
Derivative assets liabilities offset	0
Total notional amount of swaps	$35,700,000
Derivatives not Designated as Hedging Instruments \| 1st Enterprise Bank \| Interest rate swap contracts fair value
Derivative [Line Items]
Swap contracts acquired	13
Offsetting interest-rate swaps acquired	13

Balance_Sheet_Classification_o

Balance Sheet Classification of Derivative Financial Instruments (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Asset Derivatives	$719
Liability Derivatives	3,515	3,943
PC Bancorp \| Accrued Interest Payable and Other Liabilities
Derivative [Line Items]
Liability Derivatives	2,796	3,943
PC Bancorp \| Accrued Interest Payable and Other Liabilities \| Interest Rate Contracts
Derivative [Line Items]
Liability Derivatives	29,289	31,914
1st Enterprise Bank \| Accrued Interest Payable and Other Liabilities \| Interest rate swap contracts fair value
Derivative [Line Items]
Liability Derivatives	719
1st Enterprise Bank \| Accrued Interest Receivable and Other Assets \| Interest rate swap contracts fair value
Derivative [Line Items]
Asset Derivatives	719
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	519	738
Derivatives Designated as Hedging Instruments \| PC Bancorp \| Accrued Interest Payable and Other Liabilities \| Interest rate swap contracts fair value
Derivative [Line Items]
Liability Derivatives	$2,277	$3,205

Effect_of_Derivative_Instrumen

Effect of Derivative Instruments on Consolidated Statements of Income (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Net increase (decrease) in other non-interest income	($54)	$17
Derivatives not Designated as Hedging Instruments \| Loans, net
Derivative [Line Items]
Increase in fair value of interest rate swap contracts	219	306
Payments on interest rate swap contracts on loans	-273	-289
Net increase (decrease) in other non-interest income	-54	17
Derivatives not Designated as Hedging Instruments \| Subordinated debentures
Derivative [Line Items]
Increase in fair value of interest rate swap contracts		70
Payments on interest rate swap contracts on loans		-70
Derivatives Designated as Hedging Instruments \| Loans, net
Derivative [Line Items]
Increase in fair value of interest rate swap contracts	927	1,719
Increase (decrease) in fair value of hedged loans	315	-554
Payments on interest rate swap contracts on loans	-1,256	-1,294
Net increase (decrease) in other non-interest income	($14)	($129)

Securities_Sold_under_Repurcha

Securities Sold under Repurchase Agreements and Derivatives Securities Offset in Consolidated Financial Statements Due to an Enforceable Master Netting Arrangement (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting [Abstract]
Interest rate swap contracts fair value - Gross Amounts Recognized in the Consolidated Balance Sheets	$719
Interest rate swap contracts fair value - Gross Amounts Offset in the Consolidated Balance Sheets	0
Interest rate swap contracts fair value - Net Amounts of Assets Presented in the Consolidated Balance Sheets	719
Interest rate swap contracts fair value - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	719
Interest rate swap contracts fair value - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	0
Interest rate swap contracts fair value - Net Amount (Collateral over liability balance required to be pledged)	0
Total - Gross Amounts Recognized in the Consolidated Balance Sheets	719
Total - Gross Amounts Offset in the Consolidated Balance Sheets	0
Total - Net Amounts of Assets Presented in the Consolidated Balance Sheets	719
Total - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	719
Total - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	0
Total - Net Amount (Collateral over liability balance required to be pledged)	0
Interest rate swap contracts fair value - Gross Amounts Recognized in the Consolidated Balance Sheets	3,515	3,943
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	3,515	3,943
Interest rate swap contracts fair value - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	3,515	3,943
Interest rate swap contracts fair value - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	4,150	4,194
Interest rate swap contracts fair value - Net Amount (Collateral over liability balance required to be pledged)	635	251
Securities sold under agreements to repurchase - Gross Amounts Recognized in the Consolidated Balance Sheets	9,411	11,141
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	9,411	11,141
Securities sold under agreements to repurchase - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	9,411	11,141
Securities sold under agreements to repurchase - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	32,304	11,750
Securities sold under agreements to repurchase - Net Amount (Collateral over liability balance required to be pledged)	22,893	609
Total - Gross Amounts Recognized in the Consolidated Balance Sheets	12,926	15,084
Total - Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Total - Net Amounts of Assets Presented in the Consolidated Balance Sheets	12,926	15,084
Total - Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments	12,926	15,084
Total - Gross Amounts Not Offset in the Consolidated Balance Sheets - Collateral Pledged	36,454	15,944
Total - Net Amount (Collateral over liability balance required to be pledged)	$23,528	$860

Stock_Options_and_Restricted_S2

Stock Options and Restricted Stock - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options converted under equity plan	802,766
Stock options, fair value at merger	$9,600,000
Stock options, intrinsic value at merger	11,711,000
Tax benefits from stock options exercised	582,000	659,000
Tax deficiency from vesting of restricted stock			4,000
Additional tax expenses related to stock exercise	64,000	151,000	53,000
Tax benefits or deficiencies related to exercise or cancellation of stock options			0
Share based compensation, option Granted	0	0	0
Stock based compensation expense	10,000	21,000	54,000
Options exercised	221,016	282,031	0
Options outstanding	1,016,490	434,740
Total intrinsic value of options exercised	2,100,000	2,300,000
Shares of restricted stock vested	124,428
Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued	0	0	0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefits from stock options exercised	233,000	96,000
Tax deficiency from vesting of restricted stock			57,000
Stock-based compensation expense	1,700,000	1,100,000	1,100,000
Aggregate intrinsic fair value, shares	124,428
Shares of restricted stock vested	2,300,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefits from stock options exercised	349,000	563,000
1st Enterprise Bank
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, intrinsic value at merger	$11,100,000
Original Plan \| Nonqualified Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options term	10 years
Stock option vesting percentage per year	50.00%
Original Plan \| Nonqualified Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting percentage per year	20.00%
2007 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued under the plan	855,083
Issued shares subsequently cancelled and returned back into the plan	64,041
Share based compensation number of shares available for future issuance	699,505
Stock options issued	0	0	0
2007 Equity Incentive Plan \| After Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation number of shares authorized	1,490,547
10b5 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation number of shares authorized	320,764
Options exercised	88,344
Options outstanding	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

Future_Compensation_Expense_Re

Future Compensation Expense Related to Non-Vested Stock Option and Restricted Stock Grants (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2015	$1,948
2016	1,034
2017	323
2018	93
Thereafter	0
Total	3,398
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2015	2
Thereafter	0
Total	2
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2015	1,946
2016	1,034
2017	323
2018	93
Thereafter	0
Total	$3,396

Stock_Option_Activity_Detail

Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shares
Outstanding stock options at beginning, Shares	434,740
Adoption of 1ST Enterprise 2006 Stock Incentive Plan, Shares	802,766
Granted, Shares	0
Exercised, Shares	-221,016	-282,031	0
Forfeited, Shares	0
Expired, Shares	0
Outstanding stock options at ending, Shares	1,016,490	434,740
Exercisable options at December 31, 2014, Shares	1,010,290
Unvested options at December 31, 2014, Shares	6,200
Outstanding, vested and expected to vest at December 31, 2014, Shares	1,016,490
Weighted Average Exercise Price
Outstanding stock options at beginning, Weighted Average Exercise Price	$13.89
Adoption of 1ST Enterprise 2006 Stock Incentive Plan, Weighted Average Exercise Price	$7.84
Granted, Weighted Average Exercise Price	$0
Outstanding stock options at end, Weighted Average Exercise Price	$10.13	$13.89
Exercisable options at end, Weighted Average Exercise Price	$10.12
Unvested options at end, Weighted Average Exercise Price	$12.20
Outstanding, vested and expected to vest at end, Weighted Average Exercise Price	$10.13
Weighted Average Remaining Contractual Term
Outstanding stock options, Weighted Average Remaining Contractual Term	1 year 7 months 6 days	2 years 1 month 6 days
Adoption of 1STEnterprise 2006 Stock Incentive Plan, Weighted Average Remaining Contractual Term	1 year 7 months 6 days
Exercisable options at end, Weighted Average Remaining Contractual Term	1 year 7 months 6 days
Unvested options at end, Weighted Average Remaining Contractual Term	2 years 3 months 18 days
Outstanding, vested and expected to vest at end, Weighted Average Remaining Contractual Term	1 year 7 months 6 days
Aggregate Intrinsic Value
Outstanding stock options at beginning, Aggregate Intrinsic Value	$1,913
Adoption of 1ST Enterprise 2006 Stock Incentive Plan, Aggregate Intrinsic Value	$11,121
Outstanding stock options at end, Aggregate Intrinsic Value	11,770	1,913
Exercisable options at end, Aggregate Intrinsic Value	11,711
Unvested options at end, Aggregate Intrinsic Value	59
Outstanding, vested and expected to vest at end, Aggregate Intrinsic Value	$11,770

Restricted_Stock_Activity_Deta

Restricted Stock Activity (Detail) (USD $)	12 Months Ended
Restricted Stock Activity (Detail) (USD $)	Dec. 31, 2014
Number of Shares
Unvested, at beginning, Number of Shares	266,050
Granted, Number of Shares	172,900
Vested, Number of Shares	-124,428
Cancelled and forfeited, Number of Shares	-5,016
Unvested, at end, Number of Shares	309,506
Weighted-Average Grant-Date Fair Value per Share
Unvested, at beginning, Weighted-Average Grant-Date Fair Value per Share	$13.49
Granted, Weighted-Average Grant-Date Fair Value per Share	$19.39
Vested, Weighted-Average Grant-Date Fair Value per Share	$13.75
Cancelled and forfeited, Weighted-Average Grant-Date Fair Value per Share	$14.88
Unvested, at end, Weighted-Average Grant-Date Fair Value per Share	$16.66

Supplemental_Executive_and_Dir1

Supplemental Executive and Director Retirement Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Participants vesting percentage of their own deferral account	100.00%
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Accrued Supplemental executive retirement plan	$3,200,000	$2,600,000
Accrued Supplemental Employee Salary Plan	1,600,000
Accrued Deferred Director Fee Plan	313,000
Deferred salary compensation expense	705,000	661,000	217,000
Accrued Split Dollar Employee insurance plan	1,200,000	1,100,000
Split dollar life insurance expense	38,000	36,000	47,000
Supplemental Executive Retirement Plan \| 1st Enterprise Bank
Defined Benefit Plan Disclosure [Line Items]
Liability balance at acquisition of deferred compensation plan	$622,000
Participants vesting percentage of their own deferral account	100.00%
Maximum tenure for payments to be made to the employees after employment	10 years

Defined_Contribution_Plan_Four

Defined Contribution Plan Four Zero One K - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
"Safe harbor" or Guaranteed Company Contribution percentage			3.00%
Matching contribution per dollar by employer	$0.50
Employee maximum contribution percentage	4.00%
Participants vesting percentage of their own deferrals	100.00%
Contributions made to employees	$418,000	$431,000	$383,000

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009	Dec. 31, 2010
Effective Tax Rate [Line Items]
Uncertain tax positions	$0	$0	$0
Combined net Federal and State deferred tax assets	9,700,000	4,300,000
Annual limitation of operating losses					624,000
Net operating losses expiration year	2030
Capital loss carryforward expiration year	2014
Capital losses carryforward remaining expiration year	2016
Net state operating loss tax benefits		1,300,000
Net tax benefits	146,000	155,000
Tax benefit	582,000	659,000
Additional tax expenses related to stock exercise	64,000	151,000	53,000
Tax (benefit) related to re-valuing of deferred tax assets and liabilities		-326,000
Change in the federal statutory rate		1.00%
Impact of change in the federal statutory rate on provision		326,000
Statutory federal tax rate	35.00%	35.00%	35.00%
Investments in Community Redevelopment Act		1,100,000
Investment term		60 months
Interest rate of investment		0.00%		0.00%
Amount eligible for Qualified Investment Tax Credit		215,000
Effective tax rate	41.93%	33.85%	49.09%
Restricted Stock
Effective Tax Rate [Line Items]
Tax benefit	233,000	96,000
Restricted Stock \| Additional Paid-in Capital
Effective Tax Rate [Line Items]
Tax benefit	232,000	96,000
Non-qualified Stock Option Plan
Effective Tax Rate [Line Items]
Tax benefit	287,000	359,000
Non-qualified Stock Option Plan \| Additional Paid-in Capital
Effective Tax Rate [Line Items]
Tax benefit	287,000	359,000
Incentive Stock Options
Effective Tax Rate [Line Items]
Tax benefit	63,000	355,000
Incentive Stock Options \| Additional Paid-in Capital
Effective Tax Rate [Line Items]
Tax benefit	63,000	204,000
Expired 2014
Effective Tax Rate [Line Items]
Capital loss carryforward		707,000
PC Bancorp
Effective Tax Rate [Line Items]
Statutory federal tax rate		35.00%	34.00%
PC Bancorp
Effective Tax Rate [Line Items]
Capital loss carryforward	54,000	761,000
California Oaks State Bank [Member]
Effective Tax Rate [Line Items]
Federal net operating loss carry-forward attributable to COSB acquisition	282,000	906,000
State net operating loss carryforwards attributable to COSB acquisition	165,000	789,000
Decrease in both the federal and state net operating loss carryforwards	624,000
Net operating losses expiration year	2032
Net state operating loss tax benefits		631,000
Federal net operating losses		1,300,000
State net operating losses		7,000
Net federal operating loss tax benefits		1,900,000
Federal and state net operating losses	$624,000

Income_Tax_Expense_Benefit_Det

Income Tax Expense (Benefit) (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current provision
Federal									$4,517	$1,669	$2,497
State									1,183	238	265
Total current provision									5,700	1,907	2,762
Deferred provision (benefit)
Federal									382	2,674	-917
State									350	427	-180
Total deferred provision (benefit)									732	3,101	-1,097
Total current and deferred provision	$733	$2,157	$1,869	$1,673	$888	$1,239	$1,515	$1,366	$6,432	$5,008	$1,665

Components_of_Net_Deferred_Tax

Components of Net Deferred Tax Asset Recognized Accompanying Balance Sheet (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets
Federal tax operating loss carryforward	$99	$317
State tax operating loss carryforward	162	168
Allowance for loan loss	5,823	4,726
Purchase accounting and loan fair value adjustments	9,430	5,558
Accruals and other liabilities	1,457	1,570
Stock compensation and deferred compensation costs	6,703	3,145
Net unrealized loss on securities available-for-sale		143
Start up, organizational and other costs	612	255
Total deferred tax assets	24,286	15,882
Deferred Tax Liabilities
Net unrealized gain on securities available-for-sale	-138
State tax liability	-1,041	-1,270
Unamortized fair value on subordinated debentures	-1,310	-1,402
Core deposit intangibles	-3,754	-478
Prepaid expense and other	-1,524	-815
Total deferred tax liabilities	-7,767	-3,965
Valuation allowance	-15	-82
Deferred tax assets, net	$16,504	$11,835

Reconciliation_of_Statutory_In

Reconciliation of Statutory Income Tax Rate (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rate									$5,369,000	$5,178,000	$1,187,000
State franchise taxes, net of federal benefit, excluding LIHTC investments									1,209,000	524,000	315,000
Effect of rate change on net deferred tax asset										-326,000
Release of state valuation allowance on use of net operating loss									-68,000	-68,000	-150,000
Meals and entertainment, dues and other non-deductible items									75,000	54,000	47,000
Cash surrender life insurance									-231,000	-210,000	-91,000
Stock compensation expense									-53,000	-126,000	39,000
LIHTC investments									-119,000	-155,000	0
Merger costs									515,000	5,000	300,000
Other									-265,000	132,000	18,000
Total current and deferred provision	$733,000	$2,157,000	$1,869,000	$1,673,000	$888,000	$1,239,000	$1,515,000	$1,366,000	$6,432,000	$5,008,000	$1,665,000
Federal income tax expense at statutory rate									35.00%	35.00%	35.00%
State franchise taxes, net of federal benefit, excluding LIHTC investments									7.88%	3.54%	9.29%
Effect of rate change on net deferred tax asset										-2.20%
Release of state valuation allowance on use of net operating loss									-0.44%	-0.46%	-4.43%
Meals and entertainment, dues and other non-deductible items									0.49%	0.37%	1.39%
Cash surrender life insurance									-1.51%	-1.42%	-2.68%
Stock compensation expense									-0.35%	-0.85%	1.15%
LIHTC investments									-0.77%	-1.05%	0.00%
Merger costs									3.36%	0.03%	8.84%
Other									1.73%	0.89%	0.53%
Combined federal and state tax, effective rate									41.93%	33.85%	49.09%

Shareholders_Equity_Additional

Shareholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2014
Class of Stock [Line Items]
Outstanding common stock increased	5,602,492
Common stock, shares outstanding	16,683,856	11,081,364
Shares issued during period upon exercise of stock options	221,016	282,031	0
Shares issued during period upon exercise of stock options for total value	$2,029,000	$2,790,000
Shares of restricted stock issued to employees and directors	172,900
Shares repurchased of restricted stock value	471,000	422,000	228,000
Share based compensation, restricted shares issued	167,884	69,450
Preferred Stock liquidation preference amount per share				$1,000
Preferred Stock
Class of Stock [Line Items]
Preferred stock issued	16,400,000
1st Enterprise Bank
Class of Stock [Line Items]
Share received in exchange for each share				1.345
Common stock issued				5,240,409
Fair value of common stock issued as part of consideration paid				102,700,000
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
1st Enterprise Bank \| Preferred Stock
Class of Stock [Line Items]
Fair value of preferred stock				15,900,000
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	172,900	81,050
Share based compensation, unvested restricted shares cancelled	26,317	28,791
Shares repurchased of restricted stock value	$471,000	$422,000
Unvested Restricted Stock
Class of Stock [Line Items]
Share based compensation, unvested restricted shares cancelled	5,016	11,600

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net unrealized gains (losses) on investment securities: Before Tax
Beginning balance	($348)	$2,369
Non-credit portion of other-than-temporary impairments arising during the period		-41
Net unrealized gain (losses) arising during the period	681	-2,629
Other comprehensive loss before reclassification		-2,670
Reclassification adjustment for gains realized in net income		-47
Net other comprehensive income (loss)	681	-2,717
Ending balance	333	-348	2,369
Net unrealized gains (losses) on investment securities: Tax Effect
Beginning balance	143	-975
Non-credit portion of other-than-temporary impairments arising during the period		17
Net unrealized gain (losses) arising during the period	-286	1,082
Other comprehensive loss before reclassification		1,099
Reclassification adjustment for gains realized in net income		19
Net other comprehensive income (loss)	-286	1,118
Ending balance	-143	143	-975
Net unrealized gains (losses) on investment securities: Net of Tax
Beginning balance	-205	1,394
Non-credit portion of other-than-temporary impairments arising during the period		-24
Net unrealized gain (losses) arising during the period	395	-1,577	40
Other comprehensive loss before reclassification		-1,571
Reclassification adjustment for gains realized in net income		-28
Other Comprehensive Income (Loss)	395	-1,599	504
Ending balance	$190	($205)	$1,394

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Other Commitments [Line Items]
Legal proceedings against the company	$0
Allowance for unfunded loan commitments	471,000	329,000
Commitments to Extend Credit
Other Commitments [Line Items]
Financial instruments with off balance sheet risk	720,000,000	346,000,000
Commitments to Extend Credit \| Standby Letters of Credit
Other Commitments [Line Items]
Financial instruments with off balance sheet risk	$57,200,000	$40,600,000

Regulatory_Matters_Additional_

Regulatory Matters - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Nov. 30, 2014	Dec. 31, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust preferred securities tier one capital	25.00%
Trust preferred securities included in tier one risk based capital asset			$15,000,000,000
Dividend payment on preferred shares	41,000
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	$41,000
SBLF \| 1st Enterprise Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preferred stock issued		16,400

Compliance_with_Regulatory_Cap

Compliance with Regulatory Capital Requirements under Banking Regulations (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CU Bancorp
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio, actual, amount	$231,228	$145,372
Tier 1 Risk-Based Capital Ratio, actual, amount	218,147	134,440
Tier 1 Leverage Ratio, actual, amount	218,147	134,440
Total Risk-Based Capital Ratio, actual, ratio	11.61%	12.80%
Tier 1 Risk-Based Capital Ratio, actual, ratio	10.95%	11.84%
Tier 1 Leverage Ratio, actual, ratio	12.92%	9.57%
Total Risk-Based Capital Ratio, for capital adequacy purposes, amount	159,363	90,844
Tier 1 Risk-Based Capital Ratio, for capital adequacy purposes, amount	79,682	45,422
Tier 1 Leverage Ratio, for capital adequacy purposes, amount	67,564	56,172
Total Risk-Based Capital Ratio, for capital adequacy purposes, ratio	8.00%	8.00%
Tier 1 Risk-Based Capital Ratio, for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 Leverage Ratio, for capital adequacy purposes, ratio	4.00%	4.00%
Total Risk-Based Capital Ratio, to be well capitalized amount under prompt corrective provisions, amount	199,204	113,555
Tier 1 Risk-Based Capital Ratio, to be well capitalized amount under prompt corrective provisions, amount	119,523	68,133
Tier 1 Leverage Ratio, to be well capitalized amount under prompt corrective provisions, amount	84,455	70,215
Total Risk-Based Capital Ratio, to be well capitalized under prompt corrective provisions, ratio	10.00%	10.00%
Tier 1 Risk-Based Capital Ratio, to be well capitalized under prompt corrective provisions, ratio	6.00%	6.00%
Tier 1 Leverage Ratio, to be well capitalized under prompt corrective provisions, ratio	5.00%	5.00%
California United Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio, actual, amount	223,112	135,682
Tier 1 Risk-Based Capital Ratio, actual, amount	210,031	124,750
Tier 1 Leverage Ratio, actual, amount	210,031	124,750
Total Risk-Based Capital Ratio, actual, ratio	11.20%	11.96%
Tier 1 Risk-Based Capital Ratio, actual, ratio	10.55%	10.99%
Tier 1 Leverage Ratio, actual, ratio	12.44%	8.90%
Total Risk-Based Capital Ratio, for capital adequacy purposes, amount	159,300	90,772
Tier 1 Risk-Based Capital Ratio, for capital adequacy purposes, amount	79,650	45,386
Tier 1 Leverage Ratio, for capital adequacy purposes, amount	67,532	56,082
Total Risk-Based Capital Ratio, for capital adequacy purposes, ratio	8.00%	8.00%
Tier 1 Risk-Based Capital Ratio, for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 Leverage Ratio, for capital adequacy purposes, ratio	4.00%	4.00%
Total Risk-Based Capital Ratio, to be well capitalized amount under prompt corrective provisions, amount	199,125	113,465
Tier 1 Risk-Based Capital Ratio, to be well capitalized amount under prompt corrective provisions, amount	119,475	68,079
Tier 1 Leverage Ratio, to be well capitalized amount under prompt corrective provisions, amount	$84,415	$70,102
Total Risk-Based Capital Ratio, to be well capitalized under prompt corrective provisions, ratio	10.00%	10.00%
Tier 1 Risk-Based Capital Ratio, to be well capitalized under prompt corrective provisions, ratio	6.00%	6.00%
Tier 1 Leverage Ratio, to be well capitalized under prompt corrective provisions, ratio	5.00%	5.00%

Financial_Assets_and_Financial

Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	$226,962	$106,488
Interest Rate Swap Contracts	719
Interest Rate Swap Contracts	3,515	3,943
Interest rate swap contracts fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Contracts	719
Interest Rate Swap Contracts	3,515	3,943
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	226,962	106,488
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	719
Interest Rate Swap Contracts	$3,515	$3,943

Fair_Value_of_Assets_and_Liabi

Fair Value of Assets and Liabilities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
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

Balances_of_Assets_and_Liabili

Balances of Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$2,023	$264
Fair Value Hierarchy for Asset Measured on Non-recurring Basis
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)	1,173	264
Other real estate owned	850
Total	2,023	264
Significant Unobservable Inputs (Level 3) \| Fair Value Hierarchy for Asset Measured on Non-recurring Basis
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)	1,173	264
Other real estate owned	850
Total	$2,023	$264

Significant_Unobservable_Input

Significant Unobservable Inputs Used in Fair Value Measurements for Level 3 Assets and Liabilities Measured at Fair Value on Recurring or Non-Recurring Basis (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Quantitative Information About Significant Unobservable Inputs [Line Items]
Assets, fair value	$2,023	$264
Collateral Dependent Impaired Loans With Specific Valuation Allowance And Or Partial Charge-Off
Quantitative Information About Significant Unobservable Inputs [Line Items]
Significant Unobservable Inputs	Estimated selling costs
Estimated selling costs	15.00%
Collateral Dependent Impaired Loans With Specific Valuation Allowance And Or Partial Charge-Off \| Credit Loss Estimate of Aged Accounts Receivable Collateral
Quantitative Information About Significant Unobservable Inputs [Line Items]
Assets, fair value	1,173	45
Significant Unobservable Inputs	Credit loss factors on aging of accounts receivable collateral	Credit loss factors on aging of accounts receivable collateral
Credit loss factors on aging of accounts receivable collateral		80.00%
Collateral Dependent Impaired Loans With Specific Valuation Allowance And Or Partial Charge-Off \| Credit Loss Estimate of Aged Accounts Receivable Collateral \| Minimum
Quantitative Information About Significant Unobservable Inputs [Line Items]
Credit loss factors on aging of accounts receivable collateral	10.00%
Collateral Dependent Impaired Loans With Specific Valuation Allowance And Or Partial Charge-Off \| Credit Loss Estimate of Aged Accounts Receivable Collateral \| Maximum
Quantitative Information About Significant Unobservable Inputs [Line Items]
Credit loss factors on aging of accounts receivable collateral	80.00%
Collateral Dependent Impaired Loans With Specific Valuation Allowance And Or Partial Charge-Off \| Commercial Real Estate Appraisal
Quantitative Information About Significant Unobservable Inputs [Line Items]
Assets, fair value		219
Significant Unobservable Inputs		Estimated selling costs
Estimated selling costs		8.00%
Collateral Dependent Impaired Loans With Specific Valuation Allowance And Or Partial Charge-Off \| Commercial Real Estate Appraisal \| Sales Approach
Quantitative Information About Significant Unobservable Inputs [Line Items]
Significant Unobservable Inputs		Sales approach
Other Real Estate Owned \| Residential Real Estate Appraisal
Quantitative Information About Significant Unobservable Inputs [Line Items]
Assets, fair value	$850
Significant Unobservable Inputs	Estimated selling costs
Estimated selling costs	6.00%
Other Real Estate Owned \| Residential Real Estate Appraisal \| Sales Approach
Quantitative Information About Significant Unobservable Inputs [Line Items]
Significant Unobservable Inputs	Sales approach

Level_in_Fair_Value_Hierarchy_

Level in Fair Value Hierarchy for Financial Instruments Estimated Fair Values (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	$226,962	$106,488
Investment securities held-to-maturity	47,147
Loans, net, Carrying Amount	1,612,113	922,591
Loans, net, Fair Value	1,627,717	926,500
Interest rate swap contracts, Carrying Amount	719
Interest rate swap contracts, Fair Value	719
Certificates of deposit, Carrying Amount	64,840	63,581
Certificates of deposit, Fair Value	64,857	63,680
Securities sold under agreements to repurchase, Carrying Amount	9,411	11,141
Securities sold under agreements to repurchase, Fair Value	9,411	11,141
Subordinated debentures, Carrying Amount	9,538	9,379
Subordinated debentures, Fair Value	12,372	12,372
Interest rate swap contracts, Carrying Amount	3,515	3,943
Interest rate swap contracts, Fair Value	3,515	3,943
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	226,962	106,488
Investment securities held-to-maturity, Carrying Amount	47,147
Loans, net, Carrying Amount	1,612,113	922,591
Interest rate swap contracts, Carrying Amount	719
Certificates of deposit, Carrying Amount	64,840	63,581
Securities sold under agreements to repurchase, Carrying Amount	9,411	11,141
Subordinated debentures, Carrying Amount	12,372	9,379
Interest rate swap contracts, Carrying Amount	3,515	3,943
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale	226,962	106,488
Investment securities held-to-maturity	47,159
Interest rate swap contracts, Fair Value	719
Certificates of deposit, Fair Value	64,857	63,680
Securities sold under agreements to repurchase, Fair Value	9,411	11,141
Subordinated debentures, Fair Value	12,372	12,372
Interest rate swap contracts, Fair Value	3,515	3,943
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net, Fair Value	$1,627,717	$926,500

Summary_Quarterly_Data_Detail

Summary Quarterly Data (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Interest income	$16,264	$13,238	$13,039	$12,636	$12,841	$12,822	$13,114	$12,069	$55,177	$50,846	$37,496
Interest Expense	528	470	461	463	498	516	534	531	1,922	2,079	1,797
Net interest income	15,736	12,768	12,578	12,173	12,343	12,306	12,580	11,538	53,255	48,767	35,699
Provision for loan losses	1,721	35	408	75	934	631	1,153	134	2,239	2,852	1,768
Net interest income after provision for loan losses	14,015	12,733	12,170	12,098	11,409	11,675	11,427	11,404	51,016	45,915	33,931
Non-interest income	2,132	2,004	1,783	1,790	1,931	1,471	1,690	1,426	7,709	6,518	3,961
Non-interest expense	14,107	10,031	9,698	9,549	9,620	9,430	9,281	9,309	43,385	37,640	34,500
Net income before provision for income tax expense	2,040	4,706	4,255	4,339	3,720	3,716	3,836	3,521	15,340	14,793	3,392
Provision for income tax	733	2,157	1,869	1,673	888	1,239	1,515	1,366	6,432	5,008	1,665
Net Income	1,307	2,549	2,386	2,666	2,832	2,477	2,321	2,155	8,908	9,785	1,727
Preferred stock dividends and discount accretion	124								-124
Net Income Available to Common Shareholders	$1,183	$2,549	$2,386	$2,666	$2,832	$2,477	$2,321	$2,155	$8,784	$9,785	$1,727
Basic income per share	$0.09	$0.23	$0.22	$0.25	$0.26	$0.24	$0.22	$0.21	$0.77	$0.93	$0.21
Diluted income per share	$0.09	$0.23	$0.21	$0.24	$0.26	$0.23	$0.22	$0.20	$0.75	$0.90	$0.21

Parent_Company_Condensed_Balan

Parent Company Condensed Balance Sheet (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and due from banks	$33,996	$23,156
Accrued interest receivable and other assets	34,916	25,760
Total Assets	2,265,117	1,407,816
LIABILITIES
Subordinated debentures	9,538	9,379
Accrued interest payable and other liabilities	19,283	16,949
Total Liabilities	1,985,925	1,269,892
SHAREHOLDERS' EQUITY	279,192	137,924	125,623	80,844
Total Liabilities and Shareholders' Equity	2,265,117	1,407,816
CU Bancorp
ASSETS
Cash and due from banks	4,612	4,348
Loans	1,410	1,786
Investment in subsidiary	284,216	141,020
Accrued interest receivable and other assets	103	207
Total Assets	290,341	147,361
LIABILITIES
Subordinated debentures	9,538	9,379
Accrued interest payable and other liabilities	1,611	58
Total Liabilities	11,149	9,437
SHAREHOLDERS' EQUITY	279,192	137,924
Total Liabilities and Shareholders' Equity	$290,341	$147,361

Parent_Company_Condensed_Incom

Parent Company Condensed Income Statement (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income	$16,264	$13,238	$13,039	$12,636	$12,841	$12,822	$13,114	$12,069	$55,177	$50,846	$37,496
Interest Expense	528	470	461	463	498	516	534	531	1,922	2,079	1,797
Income tax benefit	-733	-2,157	-1,869	-1,673	-888	-1,239	-1,515	-1,366	-6,432	-5,008	-1,665
Net Income	1,307	2,549	2,386	2,666	2,832	2,477	2,321	2,155	8,908	9,785	1,727
CU Bancorp
Interest income									165	172
Interest Expense									430	485
Operating Expenses									911	556
Total Expenses									1,341	1,041
Loss Before Income Tax Benefit and Equity in Undistributed Earnings of Subsidiary									-1,176	-869
Income tax benefit									257	371
Loss Before Equity in Undistributed Earnings of Subsidiary									-919	-498
Equity in undistributed earnings of subsidiary									9,827	10,283
Net Income									$8,908	$9,785

Parent_Company_Condensed_Cash_

Parent Company Condensed Cash Flow Statement (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income:	$8,908,000	$9,785,000	$1,727,000
Adjustments to reconcile net income to net cash used in operating activities:
Provision for loan losses	2,239,000	2,852,000	1,768,000
Accretion of subordinated debenture discount	159,000	209,700
Decrease (increase) in accrued interest receivable and other assets	2,428,000	-7,558,000	-668,000
Increase (decrease) in accrued interest payable and other liabilities	2,041,000	6,459,000	1,282,000
Cash flows from financing activities:
Net proceeds from exercise of stock options	2,029,000	2,790,000
Issuance costs of common stock for 1st Enterprise merger	27,000
Dividends paid on preferred stock	-41,000
Net increase (decrease) in cash and cash equivalents	-108,701,000	58,391,000	48,666,000
Cash and cash equivalents, beginning of year	241,287,000	182,896,000	134,230,000
Cash and cash equivalents, end of year	132,586,000	241,287,000	182,896,000
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	1,801,000	2,029,000	1,681,000
Cash paid during the period for taxes	3,725,000	-270,000	2,685,000
CU Bancorp
Cash flows from operating activities:
Net income:	8,908,000	9,785,000
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed earnings of subsidiary	-9,827,000	-10,283,000
Provision for loan losses	-100,000
Net accretion of discounts/premiums	-26,000	-36,000
Accretion of subordinated debenture discount	159,000	210,000
Net change in fair value of interest rate contract		-70,000
Decrease (increase) in accrued interest receivable and other assets	1,351,000	-226,000
Increase (decrease) in accrued interest payable and other liabilities	396,000	32,000
Net cash provided by operating activities	861,000	588,000
Cash flows from investing activities:
Cash paid for 1stEnterprise fractional shares and dissenting shareholder	-89,000
Capital contribution made to subsidiary	-2,500,000
Maturity of certificate of deposit		370,000
Net decrease in loans	502,000	721,000
Net cash (used in) provided by investing activities	-2,087,000	1,091,000
Cash flows from financing activities:
Net proceeds from exercise of stock options	2,029,000	2,790,000
Issuance costs of common stock for 1st Enterprise merger	-27,000
Restricted stock repurchase	-471,000	-422,000
Dividends paid on preferred stock	-41,000
Net cash provided by financing activities	1,490,000	2,368,000
Net increase (decrease) in cash and cash equivalents	264,000	2,871,000
Cash and cash equivalents, beginning of year	4,348,000	1,477,000
Cash and cash equivalents, end of year	4,612,000	4,348,000
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	270,000	281,000
Cash paid during the period for taxes		$1,000