First NBC Bank Holding (FNBCQ) 10-Q 14 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'NBCB	'
Entity Registrant Name	'First NBC Bank Holding Co	'
Entity Central Index Key	'0001496631	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	18,555,172

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Cash and due from banks	$38,660	$28,140
Short-term investments	24,790	3,502
Investment in short-term receivables	252,460	246,817
Investment securities available for sale, at fair value	280,991	277,719
Investment securities held to maturity	91,075	94,904
Mortgage loans held for sale	5,264	6,577
Loans, net of allowance for loan losses of $37,403 and $32,143, respectively	2,539,681	2,325,634
Bank premises and equipment, net	52,474	51,174
Accrued interest receivable	11,691	10,994
Goodwill and other intangible assets	8,132	8,433
Investment in real estate properties	11,394	10,147
Investment in tax credit entities	111,940	117,684
Cash surrender value of bank-owned life insurance	46,583	26,187
Other real estate	5,190	3,733
Deferred tax asset	61,256	51,191
Other assets	26,827	23,781
Total assets	3,568,408	3,286,617
Deposits:	'	'
Noninterest-bearing	340,716	291,080
Interest-bearing	2,616,803	2,439,727
Total deposits	2,957,519	2,730,807
Short-term borrowings	'	8,425
Repurchase agreements	106,393	75,957
Long-term borrowings	55,110	55,110
Accrued interest payable	6,846	6,682
Other liabilities	33,366	27,777
Total liabilities	3,159,234	2,904,758
Shareholders' equity:	'	'
Common stock- par value $1 per share; 100,000,000 shares authorized; 18,554,499 shares issued and outstanding at June 30, 2014 and 18,514,271 shares issued and outstanding at December 31, 2013	18,554	18,514
Additional paid-in capital	238,241	237,063
Accumulated earnings	125,726	100,389
Accumulated other comprehensive loss, net	-15,755	-16,515
Total shareholders' equity	409,172	381,857
Noncontrolling interest	2	2
Total equity	409,174	381,859	[1]
Total liabilities and equity	3,568,408	3,286,617
Convertible Preferred Stock Series C [Member]	'	'
Shareholders' equity:	'	'
Preferred stock	4,471	4,471
Series D Preferred Stock [Member]	'	'
Shareholders' equity:	'	'
Preferred stock	$37,935	$37,935	[1]
[1]	Balances as of December 31, 2012 and December 31, 2013 are audited.

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Allowance for loan losses	$37,403	$32,143
Common stock, par value per share	$1	$1
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	18,554,499	18,514,271
Common stock, shares outstanding	18,554,499	18,514,271
Convertible Preferred Stock Series C [Member]	'	'
Preferred stock, par value	$0	$0
Preferred stock, share authorized	1,680,219,000	1,680,219,000
Preferred stock, share issued	364,983,000	364,983,000
Preferred stock, share outstanding	364,983,000	364,983,000
Series D Preferred Stock [Member]	'	'
Preferred stock, par value	$0	$0
Preferred stock, share authorized	37,935,000	37,935,000
Preferred stock, share issued	37,935,000	37,935,000
Preferred stock, share outstanding	37,935,000	37,935,000

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest income:	'	'	'	'
Loans, including fees	$33,397	$26,356	$64,496	$52,551
Investment securities	2,378	1,661	4,730	3,292
Investment in short-term receivables	1,391	958	3,086	1,695
Short-term investments	27	59	42	76
Total interest income	37,193	29,034	72,354	57,614
Interest expense:	'	'	'	'
Deposits	9,994	8,869	19,653	17,062
Borrowings and securities sold under repurchase agreements	649	910	1,303	1,611
Total interest expense	10,643	9,779	20,956	18,673
Net interest income	26,550	19,255	51,398	38,941
Provision for loan losses	3,000	2,400	6,000	5,000
Net interest income after provision for loan losses	23,550	16,855	45,398	33,941
Noninterest income:	'	'	'	'
Service charges on deposit accounts	498	462	1,057	960
Investment securities gain, net	56	'	56	306
Gain (loss) on assets sold, net	64	-15	139	148
Gain on sale of loans, net	70	55	70	278
Cash surrender value income on bank-owned life insurance	237	172	396	350
Income from sales of state tax credits	728	335	1,761	790
Community Development Entity fees earned	196	975	875	1,328
ATM fee income	505	474	978	913
Other	579	280	960	492
Total non-interest income	2,933	2,738	6,292	5,565
Noninterest expense:	'	'	'	'
Salaries and employee benefits	5,942	5,014	11,339	10,621
Occupancy and equipment expenses	2,684	2,437	5,268	4,965
Professional fees	1,511	1,577	3,410	2,993
Taxes, licenses and FDIC assessments	1,343	793	2,542	1,851
Tax credit investment amortization	3,377	2,104	6,204	3,891
Write-down of foreclosed assets	20	61	186	113
Data processing	1,141	1,068	2,239	2,116
Advertising and marketing	556	512	1,134	969
Other	1,994	1,619	3,583	3,307
Total non-interest expense	18,568	15,185	35,905	30,826
Income before income taxes	7,915	4,408	15,785	8,680
Income tax (benefit) expense	-4,784	-4,198	-9,742	-8,211
Net income	12,699	8,606	25,527	16,891
Less net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Company	12,699	8,606	25,527	16,891
Less preferred stock dividends	-95	-95	-190	-190
Less earnings allocated to participating securities	-243	-455	-489	-994
Income available to common shareholders	$12,361	$8,056	$24,848	$15,707
Earnings per common share - basic	$0.67	$0.51	$1.34	$1.09
Earnings per common share - diluted	$0.65	$0.49	$1.31	$1.06

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$12,699	$8,606	$25,527	$16,891
Fair value of derivative instruments, designated as cash flow hedges:	'	'	'	'
Change in fair value of derivative instruments designated as cash flow hedges during the period, before tax	-3,661	5,645	-8,767	6,798
Unrealized gains (loss) on investment securities:	'	'	'	'
Unrealized gains (loss) on investment securities arising during the period	4,213	-14,838	9,724	-16,924
Less: reclassification adjustment for gains included in net income	-56	'	-56	-305
Amortization of unrealized net loss on securities transferred from available for sale to held to maturity	165	'	269	'
Unrealized gains (loss) on investment securities, before tax	4,322	-14,838	9,937	-17,229
Other comprehensive income (loss), before taxes	661	-9,193	1,170	-10,431
Income tax expense (benefit) related to items of other comprehensive income (loss)	231	-3,217	410	-3,651
Other comprehensive income (loss), net of tax	430	-5,976	760	-6,780
Comprehensive income	13,129	2,630	26,287	10,111
Preferred Shareholders [Member]	'	'	'	'
Unrealized gains (loss) on investment securities:	'	'	'	'
Comprehensive income	-95	-95	-190	-190
Participating Securities [Member]	'	'	'	'
Unrealized gains (loss) on investment securities:	'	'	'	'
Comprehensive income	-243	-455	-489	-994
Common Shareholders [Member]	'	'	'	'
Unrealized gains (loss) on investment securities:	'	'	'	'
Comprehensive income	$12,791	$2,080	$25,608	$8,927

CONSOLIDATED_STATEMENTS_OF_SHA

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (USD $)		Total	Series C Preferred Stock [Member]	Series D Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interest [Member]
In Thousands
Beginning Balance at Dec. 31, 2012	[1]	$248,102	'	'	$13,052	$128,984	$59,825	($2,926)	$248,101	$1
Beginning Balance at Dec. 31, 2012	[1]	'	11,231	37,935	'	'	'	'	'	'
Net income		16,891	'	'	'	'	16,891	'	16,891	'
Other comprehensive income		-6,780	'	'	'	'	'	-6,780	-6,780	'
Share-based compensation		567	'	'	'	567	'	'	567	'
Issuance of common stock		104,500	'	'	4,808	99,692	'	'	104,500	'
Preferred stock dividends		-190	'	'	'	'	-190	'	-190	'
Ending Balance at Jun. 30, 2013		363,090	'	'	17,860	229,243	76,526	-9,706	363,089	1
Ending Balance at Jun. 30, 2013		'	11,231	37,935	'	'	'	'	'	'
Beginning Balance at Dec. 31, 2013	[1]	381,859	'	'	18,514	237,063	100,389	-16,515	381,857	2
Beginning Balance at Dec. 31, 2013	[1]	'	4,471	37,935	'	'	'	'	'	'
Net income		25,527	'	'	'	'	25,527	'	25,527	'
Other comprehensive income		760	'	'	'	'	'	760	760	'
Share-based compensation		625	'	'	'	625	'	'	625	'
Stock option and director plans		593	'	'	40	553	'	'	593	'
Preferred stock dividends		-190	'	'	'	'	-190	'	-190	'
Ending Balance at Jun. 30, 2014		409,174	'	'	18,554	238,241	125,726	-15,755	409,172	2
Ending Balance at Jun. 30, 2014		'	$4,471	$37,935	'	'	'	'	'	'
[1]	Balances as of December 31, 2012 and December 31, 2013 are audited.

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Operating activities	'	'
Net income	$25,527	$16,891
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Noncontrolling interest	0	0
Deferred tax benefit	-9,742	-8,211
Amortization of tax credit investments	6,204	3,891
Net discount accretion or premium amortization	-10	1,654
Gain on sale of investment securities	-56	-306
Gain on assets sold	-139	-148
Write-down of foreclosed assets	186	113
Proceeds from sale of mortgage loans held for sale	34,919	51,304
Mortgage loans originated and held for sale	-33,606	-39,033
Gain on sale of loans	-70	-278
Provision for loan losses	6,000	5,000
Depreciation and amortization	1,751	1,465
Share-based and other compensation expense	625	567
Increase in cash surrender value of bank-owned life insurance	-20,396	-350
Decrease in receivables from sales of investments	0	16,909
Changes in operating assets and liabilities:	'	'
Change in other assets	-5,553	-893
Change in accrued interest receivable	-697	-1,222
Change in accrued interest payable	164	676
Change in other liabilities	-2,752	7,728
Net cash provided by operating activities	2,355	55,757
Investing activities	'	'
Purchases of available for sale investment securities	-14,484	-91,928
Proceeds from sales of available for sale investment securities	4,700	37,385
Proceeds from maturities, prepayments, and calls of available for sale investment securities	16,488	77,354
Proceeds from sales of held to maturity securities	2,650	'
Proceeds from maturities, prepayments, and calls of held to maturity securities	1,171	'
Net change in investments in short-term receivables	-5,643	-95,822
Reimbursement of investment in tax credit entities	8,000	262
Purchases of investments in tax credit entities	-8,460	-16,068
Loans originated, net of repayments	-223,456	-180,783
Proceeds from sale of bank premises and equipment	0	175
Purchases of bank premises and equipment	-2,751	-3,937
Proceeds from disposition of real estate owned	2,283	758
Net cash used in investing activities	-219,502	-272,604
Financing activities	'	'
Net change in repurchase agreements	30,436	36,667
Repayment of borrowings	-8,425	-41,800
Net increase in deposits	226,541	244,296
Proceeds from sale of common stock	593	104,500
Dividends paid	-190	-190
Net cash provided by financing activities	248,955	343,473
Net change in cash, due from banks, and short-term investments	31,808	126,626
Cash, due from banks, and short-term investments at beginning of period	31,642	36,012
Cash, due from banks, and short-term investments at end of period	$63,450	$162,638

Basis_of_Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	1. Basis of Presentation
	The accompanying unaudited consolidated financial statements of First NBC Bank Holding Company (Company) have been prepared in accordance with generally accepted accounting principles for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include information or footnotes necessary for a complete presentation of financial position, results of operations, and cash flows in conformity with generally accepted accounting principles. However, in the opinion of management, all adjustments (consisting of normal recurring adjustments) necessary for a fair presentation of the financial statements have been included. The results of operations for the three-month and six-month periods ended June 30, 2014 are not necessarily indicative of the results that may be expected for the entire fiscal year. These statements should be read in conjunction with the Company’s audited financial statements, including the notes thereto, which were filed with the Securities and Exchange Commission as part of the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	In preparing the financial statements, the Company is required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
	Nature of Operations
	The Company is a bank holding company that offers a broad range of financial services through First NBC Bank, a Louisiana state non-member bank, to businesses, institutions, and individuals in southeastern Louisiana and the Mississippi Gulf Coast. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States and to prevailing practices within the banking industry.
	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of the Company and First NBC Bank, and First NBC Bank’s wholly owned subsidiaries, which include First NBC Community Development, LLC (FNBC CDC) and First NBC Community Development Fund, LLC (FNBC CDE) (collectively referred to as the Bank). FNBC CDC is a Community Development Corporation formed to construct, purchase, and renovate affordable residential real estate properties in the New Orleans area. FNBC CDE is a Community Development Entity (CDE) formed to apply for and receive allocations of Federal New Markets Tax Credits (NMTC).
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are susceptible to a significant change in the near term are the allowance for loan losses, income tax provision, fair value adjustments and share-based compensation.
	Concentration of Credit Risk
	The Company’s loan portfolio consists of the various types of loans described in Note 4. Real estate or other assets secure most loans. The majority of these loans have been made to individuals and businesses in the Company’s market area of southeastern Louisiana and southern Mississippi, which are dependent on the area economy for their livelihoods and servicing of their loan obligations. The Company does not have any significant concentrations to any one industry or customer.
	The Company maintains deposits in other financial institutions that may, from time to time, exceed the federally insured deposit limits.
	Reclassifications
	Certain reclassifications have been made to prior period balances to conform to the current period presentation.
	Recent Accounting Pronouncements
	ASU No. 2014-11
	In June 2014, the FASB issued ASU No. 2014-11 Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures, which requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty that will result in secured borrowing accounting for the repurchase agreement. The ASU requires new disclosures for repurchase agreements, securities lending transactions and repurchase-to-maturity transactions that are accounted for as secured borrowings. These disclosures include information about the types of assets pledged and the relationship between those assets and the related obligation to return the proceeds. The ASU also requires new disclosures for transfers of financial assets that are accounted for as sales that involve an agreement with the transferee entered into in contemplation of the initial transfer that result in the transferor retaining substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The accounting and disclosure changes are effective for annual periods beginning after December 15, 2014. The Company is evaluating the adoption of this ASU and has not determined the impact on the Company’s financial condition or results of operations.
	ASU No. 2014-09
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 205): An Amendment of the FASB Accounting Standards Codification, which clarifies the principles for recognizing revenue from contracts with customers. The new accounting guidance, which does not apply to financial instruments, is effective on a retrospective basis for annual reporting periods beginning after December 15, 2016, with early adoption not permitted. The Company does not expect the new guidance to have a material impact on its consolidated financial condition or results of operation.
	ASU No. 2014-01
	In January 2014, the FASB issued ASU No. 2014-01, Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects, which permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to 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). This ASU applies to all reporting entities that invest in qualified affordable housing projects through limited liability entities that are flow-through entities for tax purposes. The provisions of this ASU should be applied retrospectively to all periods presented for periods beginning after December 15, 2014, with early adoption permitted. The Company is evaluating the adoption of this ASU and has not determined the impact on the Company’s financial condition or results of operations.

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	2. Earnings Per Share
	The following sets forth the computation of basic net income per common share and diluted net income per common share:
		For the Three Months Ended				For the Six Months Ended
		June 30,				June 30,
	(In thousands, except per share data)	2014		2013		2014		2013
	Basic: Income available to common shareholders	$	12,361	$	8,056	$	24,848	$	15,707
	Weighted-average common shares outstanding		18,526,705		15,912,118		18,518,078		14,482,871
	Basic earnings per share	$	0.67	$	0.51	$	1.34	$	1.09
	Diluted: Income available to common shareholders	$	12,361	$	8,056	$	24,848	$	15,707
	Weighted-average common shares outstanding		18,526,705		15,912,118		18,518,078		14,482,871
	Effect of dilutive securities:
	Stock options outstanding		384,672		346,431		391,094		264,079
	Warrants		116,638		87,597		117,769		71,902
	Weighted-average common shares outstanding – assuming dilution		19,028,015		16,346,146		19,026,941		14,818,852
	Diluted earnings per share	$	0.65	$	0.49	$	1.31	$	1.06

Investment_Securities

Investment Securities	6 Months Ended
	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Investment Securities	'
	3. Investment Securities
	The amortized cost and market values of investment securities, with gross unrealized gains and losses, as of June 30, 2014 and December 31, 2013, were as follows (in thousands):
		Amortized			Gross		Gross Unrealized Losses						Estimated
		Cost			Unrealized								Market Value
					Gains
							Less Than			Greater Than
							One Year			One Year
	June 30, 2014
	Available for sale:
	U.S. government agency securities	$	153,896		$	769	$	—		$	(6,451	)	$	148,214
	U.S. Treasury securities		13,021			—		—			(547	)		12,474
	Municipal securities		18,785			188		(182	)		—			18,791
	Mortgage-backed securities		65,490			728		(1,258	)		—			64,960
	Corporate bonds		36,672			539		(8	)		(651	)		36,552
		$	287,864		$	2,224	$	(1,448	)	$	(7,649	)	$	280,991
	Held to maturity:
	Municipal securities	$	41,332		$	1,509	$	(16	)	$	—		$	42,825
	Mortgage-backed securities		49,743			725		(1,883	)		—			48,585
		$	91,075		$	2,234	$	(1,899	)	$	—		$	91,410
	December 31, 2013
	Available for sale:
	U.S. government agency securities	$	163,964		$	81	$	(10,991	)	$	(1,731	)	$	151,323
	U.S. Treasury securities		13,022			—		(873	)		—			12,149
	Municipal securities		23,240			140		(213	)		—			23,167
	Mortgage-backed securities		57,010			447		(1,897	)		(16	)		55,544
	Corporate bonds		37,023			395		(1,677	)		(205	)		35,536
		$	294,259		$	1,063	$	(15,651	)	$	(1,952	)	$	277,719
	Held to maturity:
	Municipal securities	$	44,294		$	94	$	(398	)	$	—		$	43,990
	Mortgage-backed securities		50,610			12		(3,646	)		—			46,976
		$	94,904		$	106	$	(4,044	)	$	—		$	90,966
	During 2013, the Company transferred securities with a fair value of $95.4 million from available for sale to held to maturity. Management determined it had both the positive intent and ability to hold these securities until maturity. The reclassified securities consisted of municipal and mortgage-backed securities and were transferred due to movements in interest rates. The securities were reclassified at fair value at the time of transfer and represented a non-cash transaction. Accumulated other comprehensive income included pre-tax unrealized losses of $5.9 million on these securities at the date of transfer. As of June 30, 2014, $5.4 million of pre-tax unrealized losses on these securities were included in accumulated other comprehensive income. These unrealized losses and offsetting other comprehensive income components are being amortized into net interest income over the remaining life of the related securities as a yield adjustment, resulting in no impact on future net income.
	As of June 30, 2014 and December 31, 2013, the Company had 46 and 88 securities, respectively, that were in a loss position. The unrealized losses for each of the 46 securities relate to market interest rate changes. The Company has considered the current market for the securities in a loss position, as well as the severity and duration of the impairments, and expects that the value will recover. As of June 30, 2014, management does not intend to sell these investments until the fair value exceeds amortized cost and it is more likely than not the Company will not be required to sell debt securities before the anticipated recovery of the amortized cost basis of the security; thus, the impairment is determined not to be other-than-temporary.
	The amortized cost and estimated market values by contractual maturity of investment securities as of June 30, 2014 and December 31, 2013 are shown in the following table (in thousands). Mortgage-backed securities have been allocated based on expected maturities. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
		June 30, 2014								December 31, 2013
		Weighted			Amortized		Estimated			Weighted			Amortized		Estimated
		Average			Cost		Market			Average			Cost		Market
		Yield					Value			Yield					Value
	Available for sale:
	Due in one year or less		1.91	%	$	3,556	$	3,638			1.39	%	$	12,340	$	12,368
	Due after one year through five years		2.69			82,862		83,688			2.58			64,790		65,038
	Due after five years through ten years		2.05			163,382		157,845			2.12			180,362		168,243
	Due after ten years		3			38,064		35,820			3.17			36,767		32,070
	Total securities		2.36	%	$	287,864	$	280,991			2.3	%	$	294,259	$	277,719
	Held to maturity:
	Due in one year or less		3.88	%	$	2,045	$	2,028			1.76	%	$	1,007	$	1,007
	Due after one year through five years		3.73			13,192		13,463			2.6			18,101		17,539
	Due after five years through ten years		3.81			35,616		36,987			3.7			37,591		37,137
	Due after ten years		3.11			40,222		38,932			3.41			38,205		35,283
	Total securities		3.49	%	$	91,075	$	91,410			3.35	%	$	94,904	$	90,966
	Securities with estimated market values of $299.5 million and $204.3 million at June 30, 2014 and December 31, 2013, respectively, were pledged to secure public deposits, securities sold under agreements to repurchase, and long-term borrowings.
	Proceeds from sales of securities for the six months ended June 30, 2014 and June 30, 2013 were $7.4 million and $37.4 million, respectively. Gross gains of $0.2 million and $0.5 million were realized on these sales for the six months ended June 30, 2014 and June 30, 2013, respectively. There were gross losses of $0.1 million and $0.2 million for the six months ended June 30, 2014 and June 30, 2013, respectively.

Loans

Loans	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Loans	'
	4. Loans
	Major classifications of loans at June 30, 2014 and December 31, 2013 were as follows (in thousands):
			June 30, 2014			December 31, 2013
	Commercial real estate loans:
	Construction		$	279,303		$	203,369
	Mortgage(1)			1,164,994			1,118,048
				1,444,297			1,321,417
	Consumer real estate loans:
	Construction			9,904			8,986
	Mortgage			123,975			115,307
				133,879			124,293
	Commercial and industrial loans			946,896			868,469
	Loans to individuals, excluding real estate			21,125			16,345
	Nonaccrual loans			20,218			16,396
	Other loans			10,669			10,857
				2,577,084			2,357,777
	Less allowance for loan losses			(37,403	)		(32,143	)
	Loans, net		$	2,539,681		$	2,325,634
	(1)	Included in commercial real estate loans, mortgage, are owner-occupied real estate loans of $354.5 million at June 30, 2014 and $364.9 million at December 31, 2013.
	A summary of changes in the allowance for loan losses during the six months ended June 30, 2014 and June 30, 2013 is as follows (in thousands):
			June 30, 2014			June 30, 2013
	Balance, beginning of period		$	32,143		$	26,977
	Provision charged to operations			6,000			5,000
	Charge-offs			(769	)		(4,316	)
	Recoveries			29			87
	Balance, end of period		$	37,403		$	27,748
	The allowance for loan losses and recorded investment in loans, including loans acquired with deteriorated credit quality as of the dates indicated are as follows (in thousands):
	June 30, 2014
			Construction			Commercial			Consumer			Commercial			Other			Total
						Real Estate			Real Estate			and			Consumer
												Industrial
	Allowance for loan losses:
	Beginning balance		$	2,790		$	13,780		$	2,656		$	12,677		$	240		$	32,143
	Charge-offs			(4	)		(396	)		(43	)		(254	)		(72	)		(769	)
	Recoveries			—			1			—			18			10			29
	Provision			1,276			1,278			676			2,690			80			6,000
	Ending balance		$	4,062		$	14,663		$	3,289		$	15,131		$	258		$	37,403
	Ending balances:
	Individually evaluated for impairment		$	33		$	1,772		$	964		$	2,400		$	1		$	5,170
	Collectively evaluated for impairment		$	4,029		$	12,891		$	2,325		$	12,731		$	257		$	32,233
	Loans receivable:
	Ending balance-total		$	289,382		$	1,178,199		$	126,368		$	961,908		$	21,227		$	2,577,084
	Ending balances:
	Individually evaluated for impairment		$	303		$	12,809		$	2,567		$	4,438		$	3		$	20,120
	Collectively evaluated for impairment		$	289,079		$	1,165,390		$	123,801		$	957,470		$	21,224		$	2,556,964
	June 30, 2013
			Construction			Commercial			Consumer			Commercial			Other			Total
						Real Estate			Real Estate			and			Consumer
												Industrial
	Allowance for loan losses:
	Beginning balance		$	2,004		$	10,716		$	2,450		$	11,675		$	132		$	26,977
	Charge-offs			—			(135	)		(24	)		(4,014	)		(143	)		(4,316	)
	Recoveries			—			11			—			56			20			87
	Provision			552			2,290			442			1,505			211			5,000
	Ending balance		$	2,556		$	12,882		$	2,868		$	9,222		$	220		$	27,748
	Ending balances:
	Individually evaluated for impairment		$	200		$	1,353		$	566		$	952		$	—		$	3,071
	Collectively evaluated for impairment		$	2,356		$	11,529		$	2,302		$	8,270		$	220		$	24,677
	Loans receivable:
	Ending balance-total		$	182,577		$	1,075,276		$	108,712		$	710,478		$	17,150		$	2,094,193
	Ending balances:
	Individually evaluated for impairment		$	803		$	7,222		$	2,922		$	2,932		$	—		$	13,879
	Collectively evaluated for impairment		$	181,774		$	1,068,054		$	105,790		$	707,546		$	17,150		$	2,080,314
Credit quality indicators on the Company’s loan portfolio, including loans acquired with deteriorated credit quality, as of the dates indicated were as follows (in thousands).
		June 30, 2014
		Pass and			Special			Substandard			Doubtful			Total
		Pass/Watch			Mention
Construction		$	276,453		$	3		$	12,926		$	—		$	289,382
Commercial real estate			1,122,316			1,632			54,251			—			1,178,199
Consumer real estate			122,006			64			4,298			—			126,368
Commercial and industrial			953,411			16			8,481			—			961,908
Other consumer			21,044			8			175			—			21,227
Total loans		$	2,495,230		$	1,723		$	80,131		$	—		$	2,577,084
		December 31, 2013
		Pass and			Special			Substandard			Doubtful			Total
		Pass/Watch			Mention
Construction		$	197,951		$	4		$	14,475		$	—		$	212,430
Commercial real estate			1,073,339			1,720			53,122			—			1,128,181
Consumer real estate			113,037			185			4,431			—			117,653
Commercial and industrial			873,547			17			9,547			—			883,111
Other consumer			16,251			9			142			—			16,402
Total loans		$	2,274,125		$	1,935		$	81,717		$	—		$	2,357,777
The table above as of June 30, 2014 includes $5.6 million of substandard loans and no special mention loans which are loans acquired with deteriorated credit quality. As of December 31, 2013, included in the above table were $7.4 million of substandard loans and $1.6 million of special mention loans which are loans acquired with deteriorated credit quality.
The above classifications follow regulatory guidelines and can generally be described as follows:
	•		Pass and pass/watch loans are of satisfactory quality.
	•		Special mention loans have an existing weakness that could cause future impairment, including the deterioration of financial ratios, past due status, questionable management capabilities, and possible reduction in the collateral values.
	•		Substandard loans have an existing specific and well-defined weakness that may include poor liquidity and deterioration of financial ratios. The loan may be past due and related deposit accounts experiencing overdrafts. Immediate corrective action is necessary.
	•		Doubtful loans have specific weaknesses that are severe enough to make collection or liquidation in full highly questionable and improbable.
Age analysis of past due loans, including loans acquired with deteriorated credit quality, as of the dates indicated were as follows (in thousands):
		June 30, 2014
		Greater			90 Days and			Total Past			Current			Total Loans
		Than 30 and			Greater Past			Due			Loans
		Fewer Than			Due
		90 Days Past
		Due
Real estate loans:
Construction		$	601		$	175		$	776		$	288,606		$	289,382
Commercial real estate			225			9,970			10,195			1,168,004			1,178,199
Consumer real estate			1,679			2,235			3,914			122,454			126,368
Total real estate loans			2,505			12,380			14,885			1,579,064			1,593,949
Other loans:
Commercial and industrial			1,476			4,403			5,879			956,029			961,908
Other consumer			274			90			364			20,863			21,227
Total other loans			1,750			4,493			6,243			976,892			983,135
Total loans		$	4,255		$	16,873		$	21,128		$	2,555,956		$	2,577,084
		December 31, 2013
		Greater Than			90 Days and			Total Past			Current
		30 and Fewer			Greater Past
		Than 90 Days
		Past Due			Due			Due			Loans			Total Loans
Real estate loans:
Construction		$	15		$	75		$	90		$	212,430		$	212,520
Commercial real estate			2,935			7,642			10,577			1,117,514			1,128,091
Consumer real estate			1,260			2,166			3,426			114,227			117,653
Total real estate loans			4,210			9,883			14,093			1,444,171			1,458,264
Other loans:
Commercial and industrial			3,076			1,281			4,357			878,754			883,111
Other consumer			488			207			695			15,707			16,402
Total other loans			3,564			1,488			5,052			894,461			899,513
Total loans		$	7,774		$	11,371		$	19,145		$	2,338,632		$	2,357,777
In the table above there were no tuition loans included with other consumer loans 90 days and greater past due as of June 30, 2014 and $0.2 million of tuition loans included with other consumer loans 90 days and greater past due as of December 31, 2013. These loans are cash secured and the Company has a right of offset against the guarantors’ deposit account when the loans are 120 days past due.
The following is a summary of information pertaining to impaired loans, which consist primarily of nonaccrual loans, excluding loans acquired with deteriorated credit quality, as of the periods indicated (in thousands):
		June 30, 2014
		Recorded			Contractual			Related
		Investment			Balance			Allowance
With no related allowance recorded:
Construction		$	48		$	48		$	—
Commercial real estate			6,836			7,209			—
Consumer real estate			1,981			1,993			—
Commercial and industrial			484			484			—
Other consumer			—			—			—
Total		$	9,349		$	9,734		$	—
With an allowance recorded:
Construction		$	255		$	255		$	33
Commercial real estate			5,973			6,187			1,772
Consumer real estate			586			611			964
Commercial and industrial			3,954			4,006			2,400
Other consumer			3			3			1
Total		$	10,771		$	11,062		$	5,170
Total impaired loans:
Construction		$	303		$	303		$	33
Commercial real estate			12,809			13,396			1,772
Consumer real estate			2,567			2,604			964
Commercial and industrial			4,438			4,490			2,400
Other consumer			3			3			1
Total		$	20,120		$	20,796		$	5,170
		December 31, 2013
		Recorded			Contractual			Related
		Investment			Balance			Allowance
With no related allowance recorded:
Construction		$	48		$	48		$	—
Commercial real estate			1,864			1,984			—
Consumer real estate			534			534			—
Commercial and industrial			854			874			—
Other consumer			—			—			—
Total		$	3,300		$	3,440		$	—
With an allowance recorded:
Construction		$	751		$	751		$	176
Commercial real estate			3,339			3,367			548
Consumer real estate			644			644			765
Commercial and industrial			13,279			13,280			5,453
Other consumer			—			—			—
Total		$	18,013		$	18,042		$	6,942
Total impaired loans:
Construction		$	799		$	799		$	176
Commercial real estate			5,203			5,351			548
Consumer real estate			1,178			1,178			765
Commercial and industrial			14,133			14,154			5,453
Other consumer			—			—			—
Total		$	21,313		$	21,482		$	6,942
		For the Three Months Ended
		June 30, 2014						June 30, 2013
		Average			Interest			Average			Interest
		Recorded			Income			Recorded			Income
		Investment			Recognized			Investment			Recognized
With no related allowance recorded:
Construction		$	48		$	1		$	48		$	—
Commercial real estate			5,716			35			1,903			47
Consumer real estate			1,981			—			1,566			7
Commercial and industrial			782			5			1,307			8
Other consumer			—			—			—			—
Total		$	8,527		$	41		$	4,824		$	62
With an allowance recorded:
Construction		$	311		$	3		$	753		$	11
Commercial real estate			6,408			—			4,390			211
Consumer real estate			652			3			1,075			1
Commercial and industrial			3,536			—			5,230			—
Other consumer			3			—			—
Total		$	10,910		$	6		$	11,448		$	223
Total impaired loans:
Construction		$	359		$	4		$	801		$	11
Commercial real estate			12,124			35			6,293			258
Consumer real estate			2,633			3			2,641			8
Commercial and industrial			4,318			5			6,537			8
Other consumer			3			—			—			—
Total		$	19,437		$	47		$	16,272		$	285
		For the Six Months Ended
		June 30, 2014						June 30, 2013
		Average			Interest			Average			Interest
		Recorded			Income			Recorded			Income
		Investment			Recognized			Investment			Recognized
With no related allowance recorded:
Construction		$	24		$	1		$	48		$	1
Commercial real estate			5,549			116			1,953			65
Consumer real estate			1,977			—			1,191			7
Commercial and industrial			792			33			1,011			30
Other consumer			—			—			—			—
Total		$	8,342		$	150		$	4,203		$	103
With an allowance recorded:
Construction		$	283		$	11		$	753		$	—
Commercial real estate			5,764			3			4,259			211
Consumer real estate			802			10			859			2
Commercial and industrial			3,430			—			7,522			43
Other consumer			—			—			—			—
Total		$	10,279		$	24		$	13,393		$	256
Total impaired loans:
Construction		$	307		$	12		$	801		$	1
Commercial real estate			11,313			119			6,212			276
Consumer real estate			2,779			10			2,050			9
Commercial and industrial			4,222			33			8,533			73
Other consumer			—			—			—			—
Total		$	18,621		$	174		$	17,596		$	359
Also presented in the above table is the average recorded investment of the impaired loans and the related amount of interest recognized during the time within the period that the impaired loans were impaired. When the ultimate collectability of the total principal of an impaired loan is in doubt and the loan is on nonaccrual status, all payments are applied to principal under the cost recovery method. When the ultimate collectability of the total principal of an impaired loan is not in doubt and the loan is in nonaccrual status, contractual interest is credited to interest income when received under the cash basis method. In the table above, all interest recognized represents cash collected. The average balances are calculated based on the month-end balances of the financing receivables of the period reported.
As of June 30, 2014, there were no loans that were past due 90 days or more that were still accruing interest, and $0.2 million in cash secured tuition loans that were past due 90 days or more still accruing interest as of December 31, 2013.
The following is a summary of information pertaining to nonaccrual loans as of the periods indicated (in thousands):
		June 30, 2014			December 31, 2013
Nonaccrual loans:
Construction		$	174		$	75
Commercial real estate			13,205			10,133
Consumer real estate			2,393			2,347
Commercial and industrial			4,343			3,784
Other consumer			103			57
		$	20,218		$	16,396
As of June 30, 2014 and December 31, 2013, the average recorded investment in nonaccrual loans was $18.2 million and $17.9 million, respectively. The amount of interest income that would have been recognized on nonaccrual loans based on contractual terms was $0.5 million and $1.0 million at June 30, 2014 and December 31, 2013, respectively. As of June 30, 2014, the Company was not committed to lend additional funds to any customer whose loan was classified as impaired.
ASC 310-30 Loans
The Company acquired certain loans from the Federal Deposit Insurance Corporation, as receiver for Central Progressive Bank, that are subject to ASC 310-30. ASC 310-30 provides recognition, measurement, and disclosure requirements for acquired loans that have evidence of deterioration of credit quality since origination for which it is probable, at acquisition, that the Company will be unable to collect all contractual amounts owed. The Company’s allowance for loan losses for all acquired loans subject to ASC 310-30 would reflect only those losses incurred after acquisition.
The following is a summary of changes in the accretable yields of acquired loans as of the periods indicated as follows (in thousands):
		June 30, 2014			June 30, 2013
Balance, beginning of period		$	170		$	628
Acquisition			—			—
Net transfers from nonaccretable difference to accretable yield			816			45
Accretion			(777	)		(323	)
Balance, end of period		$	209		$	350
Information about the Company’s troubled debt restructurings (TDRs) at June 30, 2014 and June 30, 2013 is presented in the following tables (in thousands).
		Current			Greater			Nonaccrual			Total Loans
					Than 30			TDRs
					Days Past
					Due
As of June 30, 2014
Real estate loans:
Construction		$	303		$	—		$	—		$	303
Commercial real estate			355			—			102			457
Consumer real estate			616			—			139			755
Total real estate loans			1,274			—			241			1,515
Other loans:
Commercial and industrial			305			—			—			305
Total loans		$	1,579		$	—		$	241		$	1,820
As of June 30, 2013
Real estate loans:
Construction		$	47		$	—		$	—		$	47
Commercial real estate			275			—			101			376
Consumer real estate			636						141			777
Total real estate loans			958			—			242			1,200
Other loans:
Commercial and industrial			361			—			—			361
Total loans		$	1,319		$	—		$	242		$	1,561
The Company had $1.9 million in TDRs as of December 31, 2013, of which $0.2 million were nonaccrual TDRs. There were no TDRs modified during the three and six months ended June 30, 2014 and June 30, 2013.
A summary of information pertaining to modified terms of loans, as of the dates indicated, is as follows:
		As of June 30, 2014
		Number of			Pre-			Post-
		Contracts			Modification			Modification
					Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
Troubled debt restructuring:
Construction			2		$	303		$	303
Commercial real estate			3			457			457
Consumer real estate			3			755			755
Commercial and industrial			1			305			305
			9		$	1,820		$	1,820
		As of June 30, 2013
		Number of			Pre-			Post-
		Contracts			Modification			Modification
					Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
Troubled debt restructuring:
Construction			1		$	47		$	47
Commercial real estate			3			376			376
Consumer real estate			3			777			777
Commercial and industrial			1			361			361
			8		$	1,561		$	1,561
None of the performing TDRs defaulted subsequent to the restructuring through the date the financial statements were available to be issued.
As of June 30, 2014 and December 31, 2013, the Company was not committed to lend additional funds to any customer whose loan was classified as impaired or as a TDR.

Investments_in_Tax_Credit_Enti

Investments in Tax Credit Entities	6 Months Ended
	Jun. 30, 2014
Schedule Of Investments [Abstract]	'
Investments in Tax Credit Entities	'
	5. Investments in Tax Credit Entities
	NMTC
	Investment in Bank Owned CDE
	During June 2014, the Company was notified that FNBC CDE had not been awarded an allocation of Federal New Markets Tax Credits (NMTC). FNBC CDE has received allocations of Federal NMTC, totaling $118.0 million over a three year period beginning in 2011. These allocations generated $46.0 million in tax credits. The Federal NMTC program is administered by the Community Development Financial Institutions Fund of the U.S. Treasury and is aimed at stimulating economic and community development and job creation in low-income communities. The program provides federal tax credits to investors who make qualified equity investments (QEIs) in a CDE. The CDE is required to invest the proceeds of each QEI in projects located in or benefitting low-income communities, which are generally defined as those census tracts with poverty rates greater than 20% and/or median family incomes that are less than or equal to 80% of the area median family income.
	The credit provided to the investor totals 39% of each QEI in a CDE and is claimed over a seven-year credit allowance period. In each of the first three years, the investor receives a credit equal to 5% of the total amount invested in the project. For each of the remaining four years, the investor receives a credit equal to 6% of the total amount invested in the project. The Company is eligible to receive up to $46.0 million in tax credits over the seven-year credit allowance period, beginning with the period in which the QEI was made, for its QEI of $118.0 million. Through June 30, 2014, FNBC CDE has invested in allocations of $118.0 million, of which $42.6 million of the awards was invested by the Company and $75.4 million was invested by other investors and leverage lenders, which include the Company. These investments generate a total Federal NMTC of approximately $46.0 million, of which $10.4 million has been recognized by the Company through December 31, 2013, $6.1 million in tax benefits is expected to be recognized during 2014, and $29.5 million remains available to be earned over five years beginning in 2015, subject to continuing compliance with applicable regulations. The Federal NMTCs claimed by the Company, with respect to each QEI, remain subject to recapture over each QEI’s credit allowance period upon the occurrence of any of the following:
		•	FNBC CDE does not invest substantially all (generally defined as 85%) of the QEI proceeds in qualified low income community investments;
		•	FNBC CDE ceases to be a CDE; or
		•	FNBC CDE redeems its QEI investment prior to the end of the current credit allowance period.
	The Company also made loans unrelated to the generation and use of tax credits related to these real estate projects totaling $47.5 million and $36.5 million at June 30, 2014 and December 31, 2013, respectively. These loans are subject to the Company’s normal underwriting criteria and all loans were performing according to their contractual term at June 30, 2014.
	At June 30, 2014 and December 31, 2013, none of the above recapture events had occurred, nor, in the opinion of management, are such events anticipated to occur in the foreseeable future. As of June 30, 2014, FNBC CDE had total assets of $122.1 million, consisting of cash of $7.6 million, loans of $108.3 million and other assets of $6.2 million, with liabilities of $0.3 million and capital of $121.8 million.
	Investments in Non-Bank Owned CDEs
	The Company is also a limited partner in several tax-advantaged limited partnerships and a shareholder in several C corporations whose purpose is to invest in approved Federal NMTC and state projects that are CDEs and that are not associated with FNBC CDE. At June 30, 2014, the Company had $44.6 million invested in state and federal partnerships and C corporations. These investments generated $60.5 million in Federal NMTC, of which $27.2 million had been recognized by the Company through December 31, 2013, $9.2 million is expected to be recognized during 2014, and $24.1 million is expected to be recognized in periods after 2014. Based on the structure of these transactions, the Company expects to recover its investment totaling $44.6 million solely through use of the tax credits that were generated by the investments. As such, the investment in these entities will be amortized on a straight-line basis over the period over which the Company holds its investment (approximately seven years). The Company also made loans unrelated to the generation and use of tax credits related to these real estate projects totaling $41.9 million and $45.3 million at June 30, 2014 and December 31, 2013, respectively. These loans are subject to the Company’s normal underwriting criteria and all loans were performing according to their contractual term at June 30, 2014.
	Low-Income Housing Tax Credits
	The Company is a limited partner in several tax-advantaged limited partnerships whose purpose is to invest in approved Low-Income Housing tax credit projects. At June 30, 2014 and December 31, 2013, the Company had $37.6 million and $40.0 million, respectively, invested in these partnerships, which are expected to generate Low-Income Housing tax credits of approximately $55.3 million. Of that amount, $9.5 million had been recognized through December 31, 2013, $3.5 million is expected to be recognized during 2014, and $42.3 million is expected to be recognized in periods after 2014. Based on the structure of these transactions, the Company expects to recover its remaining investments of $37.6 million at June 30, 2014 solely through use of the tax credits that were generated by the investments. As such, the investment in these partnerships will be amortized on a straight-line basis over the period for which the Company maintains its 99.99% interest in the property (approximately 15 years). The Company also made loans unrelated to the generation and use of tax credits related to these real estate projects totaling $41.9 million and $42.0 million at June 30, 2014 and December 31, 2013, respectively. These loans are subject to the Company’s normal underwriting criteria and all loans were performing according to their contractual terms at June 30, 2014.
	Federal Historic Rehabilitation Tax Credits
	The Company is a limited partner in several tax-advantaged limited partnerships whose purpose is to invest in approved Federal Historic Rehabilitation tax credit projects. At June 30, 2014 and December 31, 2013, the Company had $24.1 million and $16.5 million, respectively, invested in these partnerships. These investments are expected to generate Federal Historic Rehabilitation tax credits of $27.0 million. Of that amount, $17.8 million had been recognized through December 31, 2013 and $9.2 million is expected to be recognized during 2014. Based on the structure of these transactions, the Company expects to recover its investments totaling $24.1 million at June 30, 2014 solely through use of the tax credits that were generated by the investments. As such, these amounts will be amortized on a straight-line basis over the period during which the Company retains its 99.9% interest in the property (approximately 10 years). The Company also made loans unrelated to the generation and use of tax credits related to these real estate projects totaling $3.3 million at June 30, 2014. These loans are subject to the Company’s normal underwriting criteria and all loans were performing according to their contractual terms at June 30, 2014.

Derivative_Interest_Rate_Swap_

Derivative - Interest Rate Swap Agreements	6 Months Ended
	Jun. 30, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative - Interest Rate Swap Agreements	'
	6. Derivative - Interest Rate Swap Agreements
	Interest Rate Swaps. During 2012, the Company entered into a delayed interest rate swap with Counterparty A to manage exposure to future interest rate risk through modification of the Company’s net interest sensitivity to levels deemed to be appropriate. The Company entered this interest rate swap agreement to convert a portion of its forecasted variable-rate debt to a fixed rate, which is a cash flow hedge of a forecasted transaction. The total notional amount of the derivative contract is $115.0 million.
	During 2013, the Company entered into a delayed interest rate swap with Counterparty B to manage exposure against the variability in the expected future cash flows attributed to changes in the benchmark interest rate on a portion of its variable-rate debt. The Company entered this interest rate swap agreement to convert a portion of its variable-rate debt to a fixed rate, which is a cash flow hedge of a forecasted transaction. The total notional amount of the derivative contract is $150.0 million.
	For the six months ended June 30, 2014, the Company has not reclassified into earnings any gain or loss as a result of the discontinuance of cash flow hedges because it was probable the original forecasted transaction would not occur by the end of the originally specified term.
	At June 30, 2014, no amount of the derivatives will mature within the next 12 months. The Company does not expect to reclassify any amount from accumulated other comprehensive income into interest income over the next 12 months for derivatives that will be settled.
	For the six months ended June 30, 2014, a loss of $3.3 million (net of income taxes) has been recognized in other comprehensive income on the delayed interest rate swap with Counterparty A. For the six months ended June 30, 2013, a gain of $4.4 million (net of income taxes) has been recognized in other comprehensive income. The fair value of the derivative liability of $3.9 million as of June 30, 2014 has been recognized in other liabilities in the accompanying consolidated balance sheets. The fair value of the derivative asset was $1.2 million as of December 31, 2013 and has been recognized in other assets in the accompanying consolidated balance sheets. No amounts of gains or losses have been reclassified from accumulated comprehensive income nor have any amounts of gains or losses been recognized due to ineffectiveness of a portion of the derivative.
	Pursuant to the interest rate swap agreement with Counterparty A, the Company pledged collateral to the counterparty in the form of investment securities totaling $12.5 million (with a fair value at June 30, 2014 of $12.1 million), which has been presented gross in the Company’s balance sheet.
	Interest Rate-Prime Swaps. During 2013, the Company entered into four interest rate swaps with Counterparty B to manage exposure against the variability in the expected future cash flows on the designated Prime, Prime plus 1%, Prime plus 1% floored at 5% and Prime plus 1% floored at 5.5% pools of its floating rate loan portfolio (the Prime Hedges). The Company entered into the interest rate swap agreements to hedge the cash flows from these pools of its floating rate loan portfolio, which is expected to offset the variability in the expected future cash flows attributable to the fluctuations in the daily weighted average Wall Street Journal Prime index, which is a cash flow hedge of a forecasted transaction. The total notional amount of the prime hedges is $250.0 million.
	For the six months ended June 30, 2014 and the year ended December 31, 2013, the Company has not reclassified into earnings any gain or loss as a result of the discontinuance of cash flow hedges because it was probable the original forecasted transaction would not occur by the end of the originally specified term.
	At June 30, 2014, no amount of the derivative will mature within the next 12 months. The Company does not expect to reclassify any amount from accumulated other comprehensive income into interest income over the next 12 months for derivatives that will be settled.
	The Company entered into a master netting arrangement with Counterparty B whereby the delayed interest rate swap and Prime Hedges would be settled net.
	For the six months ended June 30, 2014, a loss of $2.5 million (net of income taxes) has been recognized on the Prime Hedges and delayed interest rate swap with Counterparty B in other comprehensive income. For the six months ended June 30, 2013, no amounts related to the Prime Hedges and delayed interest swap were recognized in other comprehensive income. The gross fair value of the derivative liability of $10.2 million for the delayed interest rate swap and the gross fair value of the derivative asset of $2.1 million for the Prime Hedges have been recognized as a net $8.1 million derivative liability in other liabilities in the accompanying consolidated balance sheets as of June 30, 2014. The gross fair values of the derivative liabilities were $2.0 million for the delayed interest rate swap and $2.3 million for the Prime Hedges as of December 31, 2013 and have been recognized in other liabilities in the accompanying consolidated balance sheets. No amounts of gains or losses have been reclassified from accumulated comprehensive income nor have any amounts of gains or losses been recognized due to ineffectiveness of a portion of the derivative as of June 30, 2014 and December 31, 2013, respectively.
	Pursuant to the interest rate swap agreements described above with Counterparty B, the Company pledged collateral in the form of investment securities totaling $82.5 million (with a fair value at June 30, 2014 of $79.6 million), which has been presented gross in the Company’s balance sheet. There was no collateral posted from the counterparty to the Company as of June 30, 2014.

Income_Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	7. Income Taxes
	The income tax benefit on the statement of income for the six months ended June 30, 2014 and 2013 was as follows (in thousands):
		June 30, 2014			June 30, 2013
	Current tax benefit	$	—		$	—
	Deferred tax benefit		(9,742	)		(8,211	)
	Total tax benefit	$	(9,742	)	$	(8,211	)
	The amount of taxes in the accompanying consolidated statements of income is different from the expected amount using statutory federal income tax rates primarily due to the effect of various tax credits. As discussed in Note 5, the Company earns Federal NMTC, Federal Historic Rehabilitation, and Low-Income Housing tax credits, which reduce the Company’s federal income tax liability or create a carryforward as applicable. The Company is also required to reduce its tax basis of the investment in certain of the projects that generated the Federal NMTC or Federal Historic Rehabilitation tax credits by the amount of the credit generated in that year. In the opinion of management, no valuation allowance was required for the net deferred tax assets at June 30, 2014 as the amounts will more likely than not be realized as reductions of future taxable income or by utilizing available tax planning strategies.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	8. Commitments and Contingencies
	Off-Balance-Sheet Arrangements
	The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These transactions include commitments to extend credit in the ordinary course of business to approved customers. Generally, loan commitments have been granted on a temporary basis for working capital or commercial real estate financing requirements or may be reflective of loans in various stages of funding. These commitments are recorded on the Company’s financial statements as they are funded. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Loan commitments include unused commitments for open-end lines secured by one to four family residential properties and commercial properties, commitments to fund loans secured by commercial real estate, construction loans, business lines of credit, and other unused commitments. Standby letters of credit are written conditional commitments issued by the Company to guarantee the performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment is funded, the Company would be entitled to seek recovery from the customer. The Company minimizes its exposure to loss under loan commitments and standby letters of credit by subjecting them to credit approval and monitoring procedures. The effect on the Company’s revenues, expenses, cash flows, and liquidity of the unused portions of these commitments cannot be reasonably predicted because there is no guarantee that the lines of credit will be used.
	The following is a summary of the total notional amount of loan commitments and standby letters of credit outstanding at June 30, 2014 and December 31, 2013 (in thousands):
		June 30, 2014		December 31, 2013
	Standby letters of credit	$	111,576	$	106,467
	Unused loan commitments		394,460		268,760
		$	506,036	$	375,227

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Accumulated Other Comprehensive Income	'
	9. Accumulated Other Comprehensive Income
	The components of accumulated other comprehensive income and changes in those components are presented in the following table (in thousands).
		Cash Flow			Transfers of			Available			Total
		Hedge			Available for			for sale
					sale securities			securities
					to Held to
					Maturity
	Balance at January 1, 2014	$	(2,054	)	$	(3,710	)	$	(10,751	)	$	(16,515	)
	Other comprehensive income before income taxes:
	Net change in unrealized gain (loss)		(8,767	)		—			9,724			957
	Reclassification of net gains realized and included in earnings		—						(56	)		(56	)
	Amortization of unrealized net gain (loss) on securities		—			269			—			269
	Income tax expense (benefit)		(3,069	)		94			3,385			410
	Balance at June 30, 2014	$	(7,752	)	$	(3,535	)	$	(4,468	)	$	(15,755	)
	Balance at January 1, 2013	$	(4,455	)	$	—		$	1,529		$	(2,926	)
	Other comprehensive income before income taxes:
	Net change in unrealized gain (loss)		6,798			—			(16,924	)		(10,126	)
	Reclassification of net gains realized and included in earnings		—			—			(305	)		(305	)
	Income tax expense (benefit)		2,379			—			(6,030	)		(3,651	)
	Balance at June 30, 2013	$	(36	)	$	—		$	(9,670	)	$	(9,706	)

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
	10. Fair Value of Financial Instruments
	ASC 820, Fair Value Measurements and Disclosures, clarifies the principle that fair value should be based on the assumptions that market participants would use when pricing the asset or liability and establishes a fair value hierarchy that prioritizes the inputs used to develop those assumptions and measure fair value. The hierarchy requires companies to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:
	Level 1 – Quoted prices in active markets for identical assets or liabilities.
	Level 2 – Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.
	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies, and similar techniques that use significant unobservable inputs.
	A description of the valuation methodologies used for instruments measured at fair value follows, as well as the classification of such instruments within the valuation hierarchy.
	Securities are classified within Level 1 when quoted market prices are available in an active market. Inputs include securities that have quoted prices in active markets for identical assets. If quoted market prices are unavailable, fair value is estimated using pricing models or quoted prices of securities with similar characteristics, at which point the securities would be classified within Level 2 of the hierarchy. Examples include certain available for sale securities. The Company’s investment portfolio did not include Level 3 securities as of June 30, 2014 and December 31, 2013.
	The Company has segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy, based on the inputs used to determine the fair value at the measurement date in the tables below (in thousands):
				June 30, 2014
				Fair Value Measurement Using
		Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				( Level 1)		(Level 2)
	Assets
	Available for sale securities:
	U.S. government agency securities	$	148,214	$	—	$	148,214	$	—
	U.S. Treasury securities		12,474		—		12,474		—
	Municipal securities		18,791		—		18,791		—
	Mortgage-backed securities		64,960		—		64,960		—
	Corporate bonds		36,552		—		36,552		—
		$	280,991	$	—	$	280,991	$	—
	Liabilities
	Derivative instruments	$	11,926	$	—	$	11,926	$	—
				December 31, 2013
				Fair Value Measurement Using
		Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				( Level 1)		(Level 2)
	Assets
	Available for sale securities:
	U.S. government agency securities	$	151,323	$	—	$	151,323	$	—
	U.S. Treasury securities		12,149		—		12,149		—
	Municipal securities		23,167		—		23,167		—
	Mortgage-backed securities		55,544		—		55,544		—
	Corporate bonds		35,536		—		35,536		—
		$	277,719	$	—	$	277,719	$	—
	Derivative instruments		1,157		—		1,157		—
	Total	$	278,876	$	—	$	278,876	$	—
	Liabilities
	Derivative instruments	$	4,317	$	—	$	4,317	$	—
	The Company has segregated all financial assets and liabilities that are measured at fair value on a nonrecurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below (in thousands).
				June 30, 2014
				Fair Value Measurement Using
		Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				( Level 1)		(Level 2)
	Assets
	Loans	$	10,772	$	—	$	—	$	10,772
	OREO		3,700		—		—		3,700
		$	14,472	$	—	$	—	$	14,472
				December 31, 2013
				Fair Value Measurement Using
		Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				( Level 1)		(Level 2)
Assets
Loans	$	9,782	$	—	$	—	$	9,782
OREO		2,390		—		—		2,390
	$	12,172	$	—	$	—	$	12,172
In accordance with ASC Topic 310, the Company records loans and other real estate considered impaired at the lower of cost or fair value. Impaired loans, recorded at fair value, are Level 3 assets measured using appraisals from external parties of the collateral, less any prior liens primarily using the market or income approach.
The Company did not record any liabilities at fair value for which measurement of the fair value was made on a nonrecurring basis during the six months ended June 30, 2014 or the year ended December 31, 2013.
ASC 820 requires the disclosure of the fair value for each class of financial instruments for which it is practicable to estimate. The fair value of a financial instrument is the current amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. ASC 820 excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company.
The following methods and assumptions were used to estimate the fair value of each class of financial instrument for which it is practicable to estimate that value.
Cash and Due from banks and Short-Term Investments
The carrying amounts of these short-term instruments approximate their fair values and would be classified within Level 1 of the hierarchy.
Investment in Short-Term Receivables
The carrying amounts of these short-term receivables approximate their fair value and would be classified within Level 1 of the hierarchy.
Investment Securities
Securities are classified within Level 1 where quoted market prices are available in the active market. If quoted market prices are unavailable, fair value is estimated using pricing models or quoted prices of securities with similar characteristics, at which point the securities would be classified within Level 2 of the hierarchy. Inputs include securities that have quoted prices in active markets for identical assets.
Loans
For variable-rate loans that reprice frequently and have no significant change in credit risk, fair values are based on carrying values. Fair values for fixed-rate commercial real estate, commercial loans, and consumer loans are estimated using discounted cash flow analyses using interest rates currently being offered for loans with similar terms and borrowers of similar credit quality. Fair value of mortgage loans held for sale is based on commitments on hand from investors or prevailing market rates. The fair value associated with the loans includes estimates related to expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows, which would be classified as Level 3 of the hierarchy.
Bank-Owned Life Insurance
The carrying amounts of the bank-owned life insurance policies are recorded at cash surrender value, which approximate their fair values and would be classified within Level 1 of the hierarchy.
Deposits
The fair values disclosed for demand deposits are, by definition, equal to the amount payable on demand at the reporting date (that is, their carrying amounts). The carrying amounts of variable-rate, fixed-term money market accounts approximate their fair values at the reporting date. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits. The fair value of the Company’s deposits would, therefore, be categorized within Level 3 of the fair value hierarchy.
Short-Term Borrowings and Repurchase Agreements
The carrying amounts of these short-term instruments approximate their fair values and would be classified within Level 2 of the hierarchy.
Long-Term Borrowings
The fair values of long-term borrowings are estimated using discounted cash flows analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. The fair value of the Company’s long-term debt would, therefore, be categorized within Level 3 of the fair value hierarchy.
Derivative Instruments
Fair values for interest rate swap agreements are based upon the amounts required to settle the contracts. The derivative instruments are classified within Level 2 of the fair value hierarchy.
The estimated fair values of the Company’s financial instruments were as follows as of the dates indicated (in thousands):
	Fair Value Measurements at June 30, 2014
	Carrying		Total		Level 1		Level 2		Level 3
	Amount
Financial Assets:
Cash and due from banks	$	38,660	$	38,660	$	38,660	$	—	$	—
Short-term investments		24,790		24,790		24,790		—		—
Investment in short-term receivables		252,460		252,460		252,460		—		—
Investment securities available for sale		280,991		280,991		—		280,991		—
Investment securities held to maturity		91,075		91,446		—		91,446		—
Loans and loans held for sale		2,582,348		2,782,833		—		—		2,782,833
Cash surrender value of bank-owned life insurance		46,583		46,583		46,583		—		—
Financial Liabilities:
Deposits, noninterest-bearing		340,716		340,716		—		340,716		—
Deposits, interest-bearing		2,616,803		2,600,965		—		—		2,600,965
Short-term borrowings and repurchase agreements		106,393		106,393		—		106,393		—
Long-term borrowings		55,110		57,628		—		—		57,628
Derivative instruments		11,926		11,926		—		11,926		—
	Fair Value Measurements at December 31, 2013
	Carrying		Total		Level 1		Level 2		Level 3
	Amount
Financial Assets:
Cash and due from banks	$	28,140	$	28,140	$	28,140	$	—	$	—
Short-term investments		3,502		3,502		3,502		—		—
Investment in short-term receivables		246,817		246,817		246,817		—		—
Investment securities available for sale		277,719		277,719		—		277,719		—
Investment securities held to maturity		94,904		90,966		—		90,966		—
Loans and loans held for sale		2,364,354		2,344,475		—		—		2,344,475
Cash surrender value of bank-owned life insurance		26,187		26,187		26,187		—		—
Derivative instruments		1,157		1,157		—		1,157		—
Financial Liabilities:
Deposits, noninterest-bearing		291,080		291,080		—		291,080		—
Deposits, interest-bearing		2,439,727		2,380,985		—		—		2,380,985
Short-term borrowings and repurchase agreements		84,382		84,382		—		84,382		—
Long-term borrowings		55,110		55,616		—		—		55,616
Derivative instruments		4,317		4,317		—		4,317		—

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Nature of Operations	'
	Nature of Operations
	The Company is a bank holding company that offers a broad range of financial services through First NBC Bank, a Louisiana state non-member bank, to businesses, institutions, and individuals in southeastern Louisiana and the Mississippi Gulf Coast. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States and to prevailing practices within the banking industry.
Principles of Consolidation	'
	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of the Company and First NBC Bank, and First NBC Bank’s wholly owned subsidiaries, which include First NBC Community Development, LLC (FNBC CDC) and First NBC Community Development Fund, LLC (FNBC CDE) (collectively referred to as the Bank). FNBC CDC is a Community Development Corporation formed to construct, purchase, and renovate affordable residential real estate properties in the New Orleans area. FNBC CDE is a Community Development Entity (CDE) formed to apply for and receive allocations of Federal New Markets Tax Credits (NMTC).
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are susceptible to a significant change in the near term are the allowance for loan losses, income tax provision, fair value adjustments and share-based compensation.
Concentration of Credit Risk	'
	Concentration of Credit Risk
	The Company’s loan portfolio consists of the various types of loans described in Note 4. Real estate or other assets secure most loans. The majority of these loans have been made to individuals and businesses in the Company’s market area of southeastern Louisiana and southern Mississippi, which are dependent on the area economy for their livelihoods and servicing of their loan obligations. The Company does not have any significant concentrations to any one industry or customer.
	The Company maintains deposits in other financial institutions that may, from time to time, exceed the federally insured deposit limits.
Reclassifications	'
	Reclassifications
	Certain reclassifications have been made to prior period balances to conform to the current period presentation.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	ASU No. 2014-11
	In June 2014, the FASB issued ASU No. 2014-11 Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures, which requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty that will result in secured borrowing accounting for the repurchase agreement. The ASU requires new disclosures for repurchase agreements, securities lending transactions and repurchase-to-maturity transactions that are accounted for as secured borrowings. These disclosures include information about the types of assets pledged and the relationship between those assets and the related obligation to return the proceeds. The ASU also requires new disclosures for transfers of financial assets that are accounted for as sales that involve an agreement with the transferee entered into in contemplation of the initial transfer that result in the transferor retaining substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The accounting and disclosure changes are effective for annual periods beginning after December 15, 2014. The Company is evaluating the adoption of this ASU and has not determined the impact on the Company’s financial condition or results of operations.
	ASU No. 2014-09
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 205): An Amendment of the FASB Accounting Standards Codification, which clarifies the principles for recognizing revenue from contracts with customers. The new accounting guidance, which does not apply to financial instruments, is effective on a retrospective basis for annual reporting periods beginning after December 15, 2016, with early adoption not permitted. The Company does not expect the new guidance to have a material impact on its consolidated financial condition or results of operation.
	ASU No. 2014-01
	In January 2014, the FASB issued ASU No. 2014-01, Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects, which permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to 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). This ASU applies to all reporting entities that invest in qualified affordable housing projects through limited liability entities that are flow-through entities for tax purposes. The provisions of this ASU should be applied retrospectively to all periods presented for periods beginning after December 15, 2014, with early adoption permitted. The Company is evaluating the adoption of this ASU and has not determined the impact on the Company’s financial condition or results of operations.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Computation of Basic and Diluted Net Income Per Common Share	'
	The following sets forth the computation of basic net income per common share and diluted net income per common share:
		For the Three Months Ended				For the Six Months Ended
		June 30,				June 30,
	(In thousands, except per share data)	2014		2013		2014		2013
	Basic: Income available to common shareholders	$	12,361	$	8,056	$	24,848	$	15,707
	Weighted-average common shares outstanding		18,526,705		15,912,118		18,518,078		14,482,871
	Basic earnings per share	$	0.67	$	0.51	$	1.34	$	1.09
	Diluted: Income available to common shareholders	$	12,361	$	8,056	$	24,848	$	15,707
	Weighted-average common shares outstanding		18,526,705		15,912,118		18,518,078		14,482,871
	Effect of dilutive securities:
	Stock options outstanding		384,672		346,431		391,094		264,079
	Warrants		116,638		87,597		117,769		71,902
	Weighted-average common shares outstanding – assuming dilution		19,028,015		16,346,146		19,026,941		14,818,852
	Diluted earnings per share	$	0.65	$	0.49	$	1.31	$	1.06

Investment_Securities_Tables

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Summary of Amortized Cost and Market Values of Investment Securities with Gross Unrealized Gains and Losses	'
	The amortized cost and market values of investment securities, with gross unrealized gains and losses, as of June 30, 2014 and December 31, 2013, were as follows (in thousands):
		Amortized			Gross		Gross Unrealized Losses						Estimated
		Cost			Unrealized								Market Value
					Gains
							Less Than			Greater Than
							One Year			One Year
	June 30, 2014
	Available for sale:
	U.S. government agency securities	$	153,896		$	769	$	—		$	(6,451	)	$	148,214
	U.S. Treasury securities		13,021			—		—			(547	)		12,474
	Municipal securities		18,785			188		(182	)		—			18,791
	Mortgage-backed securities		65,490			728		(1,258	)		—			64,960
	Corporate bonds		36,672			539		(8	)		(651	)		36,552
		$	287,864		$	2,224	$	(1,448	)	$	(7,649	)	$	280,991
	Held to maturity:
	Municipal securities	$	41,332		$	1,509	$	(16	)	$	—		$	42,825
	Mortgage-backed securities		49,743			725		(1,883	)		—			48,585
		$	91,075		$	2,234	$	(1,899	)	$	—		$	91,410
	December 31, 2013
	Available for sale:
	U.S. government agency securities	$	163,964		$	81	$	(10,991	)	$	(1,731	)	$	151,323
	U.S. Treasury securities		13,022			—		(873	)		—			12,149
	Municipal securities		23,240			140		(213	)		—			23,167
	Mortgage-backed securities		57,010			447		(1,897	)		(16	)		55,544
	Corporate bonds		37,023			395		(1,677	)		(205	)		35,536
		$	294,259		$	1,063	$	(15,651	)	$	(1,952	)	$	277,719
	Held to maturity:
	Municipal securities	$	44,294		$	94	$	(398	)	$	—		$	43,990
	Mortgage-backed securities		50,610			12		(3,646	)		—			46,976
		$	94,904		$	106	$	(4,044	)	$	—		$	90,966
Summary of Amortized Cost and Estimated Market Values by Contractual Maturity of Investment Securities	'
	The amortized cost and estimated market values by contractual maturity of investment securities as of June 30, 2014 and December 31, 2013 are shown in the following table (in thousands).
		June 30, 2014								December 31, 2013
		Weighted			Amortized		Estimated			Weighted			Amortized		Estimated
		Average			Cost		Market			Average			Cost		Market
		Yield					Value			Yield					Value
	Available for sale:
	Due in one year or less		1.91	%	$	3,556	$	3,638			1.39	%	$	12,340	$	12,368
	Due after one year through five years		2.69			82,862		83,688			2.58			64,790		65,038
	Due after five years through ten years		2.05			163,382		157,845			2.12			180,362		168,243
	Due after ten years		3			38,064		35,820			3.17			36,767		32,070
	Total securities		2.36	%	$	287,864	$	280,991			2.3	%	$	294,259	$	277,719
	Held to maturity:
	Due in one year or less		3.88	%	$	2,045	$	2,028			1.76	%	$	1,007	$	1,007
	Due after one year through five years		3.73			13,192		13,463			2.6			18,101		17,539
	Due after five years through ten years		3.81			35,616		36,987			3.7			37,591		37,137
	Due after ten years		3.11			40,222		38,932			3.41			38,205		35,283
	Total securities		3.49	%	$	91,075	$	91,410			3.35	%	$	94,904	$	90,966

Loans_Tables

Loans (Tables)	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Summary of Major Classifications of Loans	'
	Major classifications of loans at June 30, 2014 and December 31, 2013 were as follows (in thousands):
			June 30, 2014			December 31, 2013
	Commercial real estate loans:
	Construction		$	279,303		$	203,369
	Mortgage(1)			1,164,994			1,118,048
				1,444,297			1,321,417
	Consumer real estate loans:
	Construction			9,904			8,986
	Mortgage			123,975			115,307
				133,879			124,293
	Commercial and industrial loans			946,896			868,469
	Loans to individuals, excluding real estate			21,125			16,345
	Nonaccrual loans			20,218			16,396
	Other loans			10,669			10,857
				2,577,084			2,357,777
	Less allowance for loan losses			(37,403	)		(32,143	)
	Loans, net		$	2,539,681		$	2,325,634
	(1)	Included in commercial real estate loans, mortgage, are owner-occupied real estate loans, of $354.5 million at June 30, 2014 and $364.9 million at December 31, 2013.
Summary of Changes in Allowance for Loan Losses	'
	A summary of changes in the allowance for loan losses during the six months ended June 30, 2014 and June 30, 2013 is as follows (in thousands):
			June 30, 2014			June 30, 2013
	Balance, beginning of period		$	32,143		$	26,977
	Provision charged to operations			6,000			5,000
	Charge-offs			(769	)		(4,316	)
	Recoveries			29			87
	Balance, end of period		$	37,403		$	27,748
Summary of Allowance for Loan Losses and Recorded Investment in Loans	'
	The allowance for loan losses and recorded investment in loans, including loans acquired with deteriorated credit quality as of the dates indicated are as follows (in thousands):
	June 30, 2014
			Construction			Commercial			Consumer			Commercial			Other			Total
						Real Estate			Real Estate			and			Consumer
												Industrial
	Allowance for loan losses:
	Beginning balance		$	2,790		$	13,780		$	2,656		$	12,677		$	240		$	32,143
	Charge-offs			(4	)		(396	)		(43	)		(254	)		(72	)		(769	)
	Recoveries			—			1			—			18			10			29
	Provision			1,276			1,278			676			2,690			80			6,000
	Ending balance		$	4,062		$	14,663		$	3,289		$	15,131		$	258		$	37,403
	Ending balances:
	Individually evaluated for impairment		$	33		$	1,772		$	964		$	2,400		$	1		$	5,170
	Collectively evaluated for impairment		$	4,029		$	12,891		$	2,325		$	12,731		$	257		$	32,233
	Loans receivable:
	Ending balance-total		$	289,382		$	1,178,199		$	126,368		$	961,908		$	21,227		$	2,577,084
	Ending balances:
	Individually evaluated for impairment		$	303		$	12,809		$	2,567		$	4,438		$	3		$	20,120
	Collectively evaluated for impairment		$	289,079		$	1,165,390		$	123,801		$	957,470		$	21,224		$	2,556,964
	June 30, 2013
			Construction			Commercial			Consumer			Commercial			Other			Total
						Real Estate			Real Estate			and			Consumer
												Industrial
	Allowance for loan losses:
	Beginning balance		$	2,004		$	10,716		$	2,450		$	11,675		$	132		$	26,977
	Charge-offs			—			(135	)		(24	)		(4,014	)		(143	)		(4,316	)
	Recoveries			—			11			—			56			20			87
	Provision			552			2,290			442			1,505			211			5,000
	Ending balance		$	2,556		$	12,882		$	2,868		$	9,222		$	220		$	27,748
	Ending balances:
	Individually evaluated for impairment		$	200		$	1,353		$	566		$	952		$	—		$	3,071
	Collectively evaluated for impairment		$	2,356		$	11,529		$	2,302		$	8,270		$	220		$	24,677
	Loans receivable:
	Ending balance-total		$	182,577		$	1,075,276		$	108,712		$	710,478		$	17,150		$	2,094,193
	Ending balances:
	Individually evaluated for impairment		$	803		$	7,222		$	2,922		$	2,932		$	—		$	13,879
	Collectively evaluated for impairment		$	181,774		$	1,068,054		$	105,790		$	707,546		$	17,150		$	2,080,314
Summary of Credit Quality Indicators on Company's Loan Portfolio	'
	Credit quality indicators on the Company’s loan portfolio, including loans acquired with deteriorated credit quality, as of the dates indicated were as follows (in thousands).
			June 30, 2014
			Pass and			Special			Substandard			Doubtful			Total
			Pass/Watch			Mention
	Construction		$	276,453		$	3		$	12,926		$	—		$	289,382
	Commercial real estate			1,122,316			1,632			54,251			—			1,178,199
	Consumer real estate			122,006			64			4,298			—			126,368
	Commercial and industrial			953,411			16			8,481			—			961,908
	Other consumer			21,044			8			175			—			21,227
	Total loans		$	2,495,230		$	1,723		$	80,131		$	—		$	2,577,084
			December 31, 2013
			Pass and			Special			Substandard			Doubtful			Total
			Pass/Watch			Mention
	Construction		$	197,951		$	4		$	14,475		$	—		$	212,430
	Commercial real estate			1,073,339			1,720			53,122			—			1,128,181
	Consumer real estate			113,037			185			4,431			—			117,653
	Commercial and industrial			873,547			17			9,547			—			883,111
	Other consumer			16,251			9			142			—			16,402
	Total loans		$	2,274,125		$	1,935		$	81,717		$	—		$	2,357,777
Age Analysis of Past Due Loans Including Loans Acquired with Deteriorated Credit Quality	'
	Age analysis of past due loans, including loans acquired with deteriorated credit quality, as of the dates indicated were as follows (in thousands):
			June 30, 2014
			Greater			90 Days and			Total Past			Current			Total Loans
			Than 30 and			Greater Past			Due			Loans
			Fewer Than			Due
			90 Days Past
			Due
	Real estate loans:
	Construction		$	601		$	175		$	776		$	288,606		$	289,382
	Commercial real estate			225			9,970			10,195			1,168,004			1,178,199
	Consumer real estate			1,679			2,235			3,914			122,454			126,368
	Total real estate loans			2,505			12,380			14,885			1,579,064			1,593,949
	Other loans:
	Commercial and industrial			1,476			4,403			5,879			956,029			961,908
	Other consumer			274			90			364			20,863			21,227
	Total other loans			1,750			4,493			6,243			976,892			983,135
	Total loans		$	4,255		$	16,873		$	21,128		$	2,555,956		$	2,577,084
			December 31, 2013
			Greater Than			90 Days and			Total Past			Current
			30 and Fewer			Greater Past
			Than 90 Days
			Past Due			Due			Due			Loans			Total Loans
	Real estate loans:
	Construction		$	15		$	75		$	90		$	212,430		$	212,520
	Commercial real estate			2,935			7,642			10,577			1,117,514			1,128,091
	Consumer real estate			1,260			2,166			3,426			114,227			117,653
	Total real estate loans			4,210			9,883			14,093			1,444,171			1,458,264
	Other loans:
	Commercial and industrial			3,076			1,281			4,357			878,754			883,111
	Other consumer			488			207			695			15,707			16,402
	Total other loans			3,564			1,488			5,052			894,461			899,513
	Total loans		$	7,774		$	11,371		$	19,145		$	2,338,632		$	2,357,777
Summary of Information Pertaining to Impaired Loans	'
	The following is a summary of information pertaining to impaired loans, which consist primarily of nonaccrual loans, excluding loans acquired with deteriorated credit quality, as of the periods indicated (in thousands):
			June 30, 2014
			Recorded			Contractual			Related
			Investment			Balance			Allowance
	With no related allowance recorded:
	Construction		$	48		$	48		$	—
	Commercial real estate			6,836			7,209			—
	Consumer real estate			1,981			1,993			—
	Commercial and industrial			484			484			—
	Other consumer			—			—			—
	Total		$	9,349		$	9,734		$	—
	With an allowance recorded:
	Construction		$	255		$	255		$	33
	Commercial real estate			5,973			6,187			1,772
	Consumer real estate			586			611			964
	Commercial and industrial			3,954			4,006			2,400
	Other consumer			3			3			1
	Total		$	10,771		$	11,062		$	5,170
	Total impaired loans:
	Construction		$	303		$	303		$	33
	Commercial real estate			12,809			13,396			1,772
	Consumer real estate			2,567			2,604			964
	Commercial and industrial			4,438			4,490			2,400
	Other consumer			3			3			1
	Total		$	20,120		$	20,796		$	5,170
			December 31, 2013
			Recorded			Contractual			Related
			Investment			Balance			Allowance
	With no related allowance recorded:
	Construction		$	48		$	48		$	—
	Commercial real estate			1,864			1,984			—
	Consumer real estate			534			534			—
	Commercial and industrial			854			874			—
	Other consumer			—			—			—
	Total		$	3,300		$	3,440		$	—
	With an allowance recorded:
	Construction		$	751		$	751		$	176
	Commercial real estate			3,339			3,367			548
	Consumer real estate			644			644			765
	Commercial and industrial			13,279			13,280			5,453
	Other consumer			—			—			—
	Total		$	18,013		$	18,042		$	6,942
	Total impaired loans:
	Construction		$	799		$	799		$	176
	Commercial real estate			5,203			5,351			548
	Consumer real estate			1,178			1,178			765
	Commercial and industrial			14,133			14,154			5,453
	Other consumer			—			—			—
	Total		$	21,313		$	21,482		$	6,942
			For the Three Months Ended
			June 30, 2014						June 30, 2013
			Average			Interest			Average			Interest
			Recorded			Income			Recorded			Income
			Investment			Recognized			Investment			Recognized
	With no related allowance recorded:
	Construction		$	48		$	1		$	48		$	—
	Commercial real estate			5,716			35			1,903			47
	Consumer real estate			1,981			—			1,566			7
	Commercial and industrial			782			5			1,307			8
	Other consumer			—			—			—			—
	Total		$	8,527		$	41		$	4,824		$	62
	With an allowance recorded:
	Construction		$	311		$	3		$	753		$	11
Commercial real estate			6,408			—			4,390			211
Consumer real estate			652			3			1,075			1
Commercial and industrial			3,536			—			5,230			—
Other consumer			3			—			—
Total		$	10,910		$	6		$	11,448		$	223
Total impaired loans:
Construction		$	359		$	4		$	801		$	11
Commercial real estate			12,124			35			6,293			258
Consumer real estate			2,633			3			2,641			8
Commercial and industrial			4,318			5			6,537			8
Other consumer			3			—			—			—
Total		$	19,437		$	47		$	16,272		$	285
		For the Six Months Ended
		June 30, 2014						June 30, 2013
		Average			Interest			Average			Interest
		Recorded			Income			Recorded			Income
		Investment			Recognized			Investment			Recognized
With no related allowance recorded:
Construction		$	24		$	1		$	48		$	1
Commercial real estate			5,549			116			1,953			65
Consumer real estate			1,977			—			1,191			7
Commercial and industrial			792			33			1,011			30
Other consumer			—			—			—			—
Total		$	8,342		$	150		$	4,203		$	103
With an allowance recorded:
Construction		$	283		$	11		$	753		$	—
Commercial real estate			5,764			3			4,259			211
Consumer real estate			802			10			859			2
Commercial and industrial			3,430			—			7,522			43
Other consumer			—			—			—			—
Total		$	10,279		$	24		$	13,393		$	256
Total impaired loans:
Construction		$	307		$	12		$	801		$	1
Commercial real estate			11,313			119			6,212			276
Consumer real estate			2,779			10			2,050			9
Commercial and industrial			4,222			33			8,533			73
Other consumer			—			—			—			—
Total		$	18,621		$	174		$	17,596		$	359
Summary of Nonaccrual Loans	'
	The following is a summary of information pertaining to nonaccrual loans as of the periods indicated (in thousands):
			June 30, 2014			December 31, 2013
	Nonaccrual loans:
	Construction		$	174		$	75
	Commercial real estate			13,205			10,133
	Consumer real estate			2,393			2,347
	Commercial and industrial			4,343			3,784
	Other consumer			103			57
			$	20,218		$	16,396
Changes in Carrying Amount of Accretable Yield for Purchased Credit Impaired Loans Acquired	'
	The following is a summary of changes in the accretable yields of acquired loans as of the periods indicated as follows (in thousands):
			June 30, 2014			June 30, 2013
	Balance, beginning of period		$	170		$	628
	Acquisition			—			—
	Net transfers from nonaccretable difference to accretable yield			816			45
	Accretion			(777	)		(323	)
	Balance, end of period		$	209		$	350
Summary of Company's Troubled Debt Restructurings ("TDRs')	'
	Information about the Company’s troubled debt restructurings (TDRs) at June 30, 2014 and June 30, 2013, is presented in the following tables (in thousands).
			Current			Greater			Nonaccrual			Total Loans
						Than 30			TDRs
						Days Past
						Due
	As of June 30, 2014
	Real estate loans:
	Construction		$	303		$	—		$	—		$	303
	Commercial real estate			355			—			102			457
	Consumer real estate			616			—			139			755
	Total real estate loans			1,274			—			241			1,515
	Other loans:
	Commercial and industrial			305			—			—			305
	Total loans		$	1,579		$	—		$	241		$	1,820
	As of June 30, 2013
	Real estate loans:
	Construction		$	47		$	—		$	—		$	47
	Commercial real estate			275			—			101			376
	Consumer real estate			636						141			777
	Total real estate loans			958			—			242			1,200
	Other loans:
	Commercial and industrial			361			—			—			361
	Total loans		$	1,319		$	—		$	242		$	1,561
Summary of Information Pertaining to Modified Terms of Loans	'
	A summary of information pertaining to modified terms of loans, as of the dates indicated, is as follows:
			As of June 30, 2014
			Number of			Pre-			Post-
			Contracts			Modification			Modification
						Outstanding			Outstanding
						Recorded			Recorded
						Investment			Investment
	Troubled debt restructuring:
	Construction			2		$	303		$	303
	Commercial real estate			3			457			457
	Consumer real estate			3			755			755
	Commercial and industrial			1			305			305
				9		$	1,820		$	1,820
			As of June 30, 2013
			Number of			Pre-			Post-
			Contracts			Modification			Modification
						Outstanding			Outstanding
						Recorded			Recorded
						Investment			Investment
	Troubled debt restructuring:
	Construction			1		$	47		$	47
	Commercial real estate			3			376			376
	Consumer real estate			3			777			777
	Commercial and industrial			1			361			361
				8		$	1,561		$	1,561

Income_Taxes_Tables

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Summary of Income Tax Benefit on Statement of Income	'
	The income tax benefit on the statement of income for the six months ended June 30, 2014 and 2013 was as follows (in thousands):
		June 30, 2014			June 30, 2013
	Current tax benefit	$	—		$	—
	Deferred tax benefit		(9,742	)		(8,211	)
	Total tax benefit	$	(9,742	)	$	(8,211	)

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Summary of Total Notional Amount of Loan Commitments and Standby Letters of Credit	'
	The following is a summary of the total notional amount of loan commitments and standby letters of credit outstanding at June 30, 2014 and December 31, 2013 (in thousands):
		June 30, 2014		December 31, 2013
	Standby letters of credit	$	111,576	$	106,467
	Unused loan commitments		394,460		268,760
		$	506,036	$	375,227

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Summary of Changes in Accumulated Other Comprehensive Income (Loss)	'
	The components of accumulated other comprehensive income and changes in those components are presented in the following table (in thousands).
		Cash Flow			Transfers of			Available			Total
		Hedge			Available for			for sale
					sale securities			securities
					to Held to
					Maturity
	Balance at January 1, 2014	$	(2,054	)	$	(3,710	)	$	(10,751	)	$	(16,515	)
	Other comprehensive income before income taxes:
	Net change in unrealized gain (loss)		(8,767	)		—			9,724			957
	Reclassification of net gains realized and included in earnings		—						(56	)		(56	)
	Amortization of unrealized net gain (loss) on securities		—			269			—			269
	Income tax expense (benefit)		(3,069	)		94			3,385			410
	Balance at June 30, 2014	$	(7,752	)	$	(3,535	)	$	(4,468	)	$	(15,755	)
	Balance at January 1, 2013	$	(4,455	)	$	—		$	1,529		$	(2,926	)
	Other comprehensive income before income taxes:
	Net change in unrealized gain (loss)		6,798			—			(16,924	)		(10,126	)
	Reclassification of net gains realized and included in earnings		—			—			(305	)		(305	)
	Income tax expense (benefit)		2,379			—			(6,030	)		(3,651	)
	Balance at June 30, 2013	$	(36	)	$	—		$	(9,670	)	$	(9,706	)

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Carrying Value and Fair Value Measurements of Financial Assets and Liabilities on Recurring Basis	'
	The Company has segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy, based on the inputs used to determine the fair value at the measurement date in the tables below (in thousands):
				June 30, 2014
				Fair Value Measurement Using
		Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				( Level 1)		(Level 2)
	Assets
	Available for sale securities:
	U.S. government agency securities	$	148,214	$	—	$	148,214	$	—
	U.S. Treasury securities		12,474		—		12,474		—
	Municipal securities		18,791		—		18,791		—
	Mortgage-backed securities		64,960		—		64,960		—
	Corporate bonds		36,552		—		36,552		—
		$	280,991	$	—	$	280,991	$	—
	Liabilities
	Derivative instruments	$	11,926	$	—	$	11,926	$	—
				December 31, 2013
				Fair Value Measurement Using
		Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				( Level 1)		(Level 2)
	Assets
	Available for sale securities:
	U.S. government agency securities	$	151,323	$	—	$	151,323	$	—
	U.S. Treasury securities		12,149		—		12,149		—
	Municipal securities		23,167		—		23,167		—
	Mortgage-backed securities		55,544		—		55,544		—
	Corporate bonds		35,536		—		35,536		—
		$	277,719	$	—	$	277,719	$	—
	Derivative instruments		1,157		—		1,157		—
	Total	$	278,876	$	—	$	278,876	$	—
	Liabilities
	Derivative instruments	$	4,317	$	—	$	4,317	$	—
Carrying Value and Fair Value Measurements of Financial Assets and Liabilities on Non Recurring Basis	'
	The Company has segregated all financial assets and liabilities that are measured at fair value on a nonrecurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below (in thousands).
				June 30, 2014
				Fair Value Measurement Using
		Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				( Level 1)		(Level 2)
	Assets
	Loans	$	10,772	$	—	$	—	$	10,772
	OREO		3,700		—		—		3,700
		$	14,472	$	—	$	—	$	14,472
				December 31, 2013
				Fair Value Measurement Using
		Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				( Level 1)		(Level 2)
	Assets
	Loans	$	9,782	$	—	$	—	$	9,782
	OREO		2,390		—		—		2,390
		$	12,172	$	—	$	—	$	12,172
Carrying Value and Fair Value Measurements of Financial Instruments	'
	The estimated fair values of the Company’s financial instruments were as follows as of the dates indicated (in thousands):
		Fair Value Measurements at June 30, 2014
		Carrying		Total		Level 1		Level 2		Level 3
		Amount
	Financial Assets:
	Cash and due from banks	$	38,660	$	38,660	$	38,660	$	—	$	—
	Short-term investments		24,790		24,790		24,790		—		—
	Investment in short-term receivables		252,460		252,460		252,460		—		—
	Investment securities available for sale		280,991		280,991		—		280,991		—
	Investment securities held to maturity		91,075		91,446		—		91,446		—
	Loans and loans held for sale		2,582,348		2,782,833		—		—		2,782,833
	Cash surrender value of bank-owned life insurance		46,583		46,583		46,583		—		—
	Financial Liabilities:
	Deposits, noninterest-bearing		340,716		340,716		—		340,716		—
	Deposits, interest-bearing		2,616,803		2,600,965		—		—		2,600,965
	Short-term borrowings and repurchase agreements		106,393		106,393		—		106,393		—
	Long-term borrowings		55,110		57,628		—		—		57,628
	Derivative instruments		11,926		11,926		—		11,926		—
		Fair Value Measurements at December 31, 2013
		Carrying		Total		Level 1		Level 2		Level 3
		Amount
	Financial Assets:
	Cash and due from banks	$	28,140	$	28,140	$	28,140	$	—	$	—
	Short-term investments		3,502		3,502		3,502		—		—
	Investment in short-term receivables		246,817		246,817		246,817		—		—
	Investment securities available for sale		277,719		277,719		—		277,719		—
	Investment securities held to maturity		94,904		90,966		—		90,966		—
	Loans and loans held for sale		2,364,354		2,344,475		—		—		2,344,475
	Cash surrender value of bank-owned life insurance		26,187		26,187		26,187		—		—
	Derivative instruments		1,157		1,157		—		1,157		—
	Financial Liabilities:
	Deposits, noninterest-bearing		291,080		291,080		—		291,080		—
	Deposits, interest-bearing		2,439,727		2,380,985		—		—		2,380,985
	Short-term borrowings and repurchase agreements		84,382		84,382		—		84,382		—
	Long-term borrowings		55,110		55,616		—		—		55,616
	Derivative instruments		4,317		4,317		—		4,317		—

Earnings_Per_Share_Schedule_of

Earnings Per Share - Schedule of Computation of Basic and Diluted Net Income Per Common Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Basic: Income available to common shareholders	$12,361	$8,056	$24,848	$15,707
Weighted-average common shares outstanding	18,526,705	15,912,118	18,518,078	14,482,871
Basic earnings per share	$0.67	$0.51	$1.34	$1.09
Diluted: Income available to common shareholders	$12,361	$8,056	$24,848	$15,707
Weighted-average common shares outstanding	18,526,705	15,912,118	18,518,078	14,482,871
Stock options outstanding	384,672	346,431	391,094	264,079
Warrants	116,638	87,597	117,769	71,902
Weighted-average common shares outstanding - assuming dilution	19,028,015	16,346,146	19,026,941	14,818,852
Diluted earnings per share	$0.65	$0.49	$1.31	$1.06

Investment_Securities_Summary_

Investment Securities - Summary of Amortized Cost and Market Values of Investment Securities with Gross Unrealized Gains and Losses (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$287,864	$294,259
Gross Unrealized Gains	2,224	1,063
Gross Unrealized Losses Less Than One Year	-1,448	-15,651
Gross Unrealized Losses Greater Than One Year	-7,649	-1,952
Estimated Market Value	280,991	277,719
Amortized Cost	91,075	94,904
Gross Unrealized Gains	2,234	106
Gross Unrealized Losses Less Than One Year	-1,899	-4,044
Gross Unrealized Losses Greater Than One Year	'	'
Estimated Market Value	91,075	94,904
U.S. government agency securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	153,896	163,964
Gross Unrealized Gains	769	81
Gross Unrealized Losses Less Than One Year	'	-10,991
Gross Unrealized Losses Greater Than One Year	-6,451	-1,731
Estimated Market Value	148,214	151,323
U.S. Treasury securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	13,021	13,022
Gross Unrealized Gains	'	'
Gross Unrealized Losses Less Than One Year	'	-873
Gross Unrealized Losses Greater Than One Year	-547	'
Estimated Market Value	12,474	12,149
Municipal securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	18,785	23,240
Gross Unrealized Gains	188	140
Gross Unrealized Losses Less Than One Year	-182	-213
Gross Unrealized Losses Greater Than One Year	'	'
Estimated Market Value	18,791	23,167
Amortized Cost	41,332	44,294
Gross Unrealized Gains	1,509	94
Gross Unrealized Losses Less Than One Year	-16	-398
Gross Unrealized Losses Greater Than One Year	'	'
Estimated Market Value	42,825	43,990
Mortgage-backed securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	65,490	57,010
Gross Unrealized Gains	728	447
Gross Unrealized Losses Less Than One Year	-1,258	-1,897
Gross Unrealized Losses Greater Than One Year	'	-16
Estimated Market Value	64,960	55,544
Amortized Cost	49,743	50,610
Gross Unrealized Gains	725	12
Gross Unrealized Losses Less Than One Year	-1,883	-3,646
Gross Unrealized Losses Greater Than One Year	'	'
Estimated Market Value	48,585	46,976
Corporate bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	36,672	37,023
Gross Unrealized Gains	539	395
Gross Unrealized Losses Less Than One Year	-8	-1,677
Gross Unrealized Losses Greater Than One Year	-651	-205
Estimated Market Value	$36,552	$35,536

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	6 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
	Security		Security
Investments Debt And Equity Securities [Abstract]	'	'	'
Transfer of securities with fair value	'	'	$95.40
Accumulated other comprehensive income included net pre-tax unrealized losses	5.4	'	5.9
Number of securities in loss position	46	'	88
Securities with estimated market values	299.5	'	204.3
Proceeds from sales of securities	7.4	37.4	'
Gross gains realized	0.2	0.5	'
Gross losses realized	$0.10	$0.20	'

Investment_Securities_Summary_1

Investment Securities - Summary of Amortized Cost and Estimated Market Values by Contractual Maturity of Investment Securities (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost And Fair Value Debt Securities [Abstract]	'	'
Weighted average yield, Due in one year or less	1.91%	1.39%
Weighted average yield, Due after one year through five years	2.69%	2.58%
Weighted average yield, Due after five years through ten years	2.05%	2.12%
Weighted average yield, Due after ten years	3.00%	3.17%
Weighted average yield, Total securities	2.36%	2.30%
Weighted average yield, Due in one year or less	3.88%	1.76%
Weighted average yield, Due after one year through five years	3.73%	2.60%
Weighted average yield, Due after five years through ten years	3.81%	3.70%
Weighted average yield, Due after ten years	3.11%	3.41%
Weighted average yield, Total securities	3.49%	3.35%
Amortized Cost, Due in one year or less	$3,556	$12,340
Amortized Cost, Due after one year through five years	82,862	64,790
Amortized Cost, Due after five years through ten years	163,382	180,362
Amortized Cost, Due after ten years	38,064	36,767
Amortized Cost, Total securities	287,864	294,259
Amortized Cost, Due in one year or less	2,045	1,007
Amortized Cost, Due after one year through five years	13,192	18,101
Amortized Cost, Due after five years through ten years	35,616	37,591
Amortized Cost, Due after ten years	40,222	38,205
Amortized Cost, Total securities	91,075	94,904
Estimated Market Value, Due in one year or less	3,638	12,368
Estimated Market Value, Due after one year through five years	83,688	65,038
Estimated Market Value, Due after five years through ten years	157,845	168,243
Estimated Market Value, Due after ten years	35,820	32,070
Estimated Market Value	280,991	277,719
Estimated Market Value, Due in one year or less	2,028	1,007
Estimated Market Value, Due after one year through five years	13,463	17,539
Estimated Market Value, Due after five years through ten years	36,987	37,137
Estimated Market Value, Due after ten years	38,932	35,283
Estimated Market Value, Total securities	$91,075	$94,904

Loans_Summary_of_Major_Classif

Loans - Summary of Major Classifications of Loans (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Commercial real estate loans:	'	'	'	'
Construction	$279,303	$203,369	'	'
Mortgage	1,164,994	1,118,048	'	'
Total commercial real estate loans	1,444,297	1,321,417	'	'
Consumer real estate loans:	'	'	'	'
Construction	9,904	8,986	'	'
Mortgage	123,975	115,307	'	'
Total consumer real estate loans	133,879	124,293	'	'
Commercial and industrial loans	946,896	868,469	'	'
Loans to individuals, excluding real estate	21,125	16,345	'	'
Nonaccrual loans	20,218	16,396	'	'
Other loans	10,669	10,857	'	'
Loans, gross	2,577,084	2,357,777	'	'
Less allowance for loan losses	-37,403	-32,143	-27,748	-26,977
Loans, net	$2,539,681	$2,325,634	'	'

Loans_Summary_of_Major_Classif1

Loans - Summary of Major Classifications of Loans (Parenthetical) (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Federal Home Loan Banks [Abstract]	'	'
Commercial real estate loans	$354.50	$364.90

Loans_Summary_of_Changes_in_Al

Loans - Summary of Changes in Allowance for Loan Losses (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Allowance For Loan And Lease Losses [Roll Forward]	'	'	'	'
Balance, beginning of period	'	'	$32,143	$26,977
Provision charged to operations	3,000	2,400	6,000	5,000
Charge-offs	'	'	-769	-4,316
Recoveries	'	'	29	87
Balance, end of period	$37,403	$27,748	$37,403	$27,748

Loans_Summary_of_Allowance_for

Loans - Summary of Allowance for Loan Losses and Recorded Investment in Loans (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Balance, beginning of period	'	'	$32,143	$26,977	'
Charge-offs	'	'	-769	-4,316	'
Recoveries	'	'	29	87	'
Provision	3,000	2,400	6,000	5,000	'
Balance, end of period	37,403	27,748	37,403	27,748	'
Individually evaluated for impairment	5,170	3,071	5,170	3,071	'
Collectively evaluated for impairment	32,233	24,677	32,233	24,677	'
Ending balance-total	2,577,084	'	2,577,084	'	2,357,777
Loans receivable [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Ending balance-total	2,577,084	2,094,193	2,577,084	2,094,193	'
Individually evaluated for impairment	20,120	13,879	20,120	13,879	'
Collectively evaluated for impairment	2,556,964	2,080,314	2,556,964	2,080,314	'
Construction [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Balance, beginning of period	'	'	2,790	2,004	'
Charge-offs	'	'	-4	'	'
Recoveries	'	'	'	'	'
Provision	'	'	1,276	552	'
Balance, end of period	4,062	2,556	4,062	2,556	'
Individually evaluated for impairment	33	200	33	200	'
Collectively evaluated for impairment	4,029	2,356	4,029	2,356	'
Ending balance-total	289,382	'	289,382	'	212,520
Construction [Member] | Loans receivable [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Ending balance-total	289,382	182,577	289,382	182,577	'
Individually evaluated for impairment	303	803	303	803	'
Collectively evaluated for impairment	289,079	181,774	289,079	181,774	'
Commercial real estate [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Balance, beginning of period	'	'	13,780	10,716	'
Charge-offs	'	'	-396	-135	'
Recoveries	'	'	1	11	'
Provision	'	'	1,278	2,290	'
Balance, end of period	14,663	12,882	14,663	12,882	'
Individually evaluated for impairment	1,772	1,353	1,772	1,353	'
Collectively evaluated for impairment	12,891	11,529	12,891	11,529	'
Ending balance-total	1,178,199	'	1,178,199	'	1,128,091
Commercial real estate [Member] | Loans receivable [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Ending balance-total	1,178,199	1,075,276	1,178,199	1,075,276	'
Individually evaluated for impairment	12,809	7,222	12,809	7,222	'
Collectively evaluated for impairment	1,165,390	1,068,054	1,165,390	1,068,054	'
Consumer real estate [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Balance, beginning of period	'	'	2,656	2,450	'
Charge-offs	'	'	-43	-24	'
Recoveries	'	'	'	'	'
Provision	'	'	676	442	'
Balance, end of period	3,289	2,868	3,289	2,868	'
Individually evaluated for impairment	964	566	964	566	'
Collectively evaluated for impairment	2,325	2,302	2,325	2,302	'
Ending balance-total	126,368	'	126,368	'	117,653
Consumer real estate [Member] | Loans receivable [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Ending balance-total	126,368	108,712	126,368	108,712	'
Individually evaluated for impairment	2,567	2,922	2,567	2,922	'
Collectively evaluated for impairment	123,801	105,790	123,801	105,790	'
Commercial and industrial [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Balance, beginning of period	'	'	12,677	11,675	'
Charge-offs	'	'	-254	-4,014	'
Recoveries	'	'	18	56	'
Provision	'	'	2,690	1,505	'
Balance, end of period	15,131	9,222	15,131	9,222	'
Individually evaluated for impairment	2,400	952	2,400	952	'
Collectively evaluated for impairment	12,731	8,270	12,731	8,270	'
Ending balance-total	961,908	'	961,908	'	883,111
Commercial and industrial [Member] | Loans receivable [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Ending balance-total	961,908	710,478	961,908	710,478	'
Individually evaluated for impairment	4,438	2,932	4,438	2,932	'
Collectively evaluated for impairment	957,470	707,546	957,470	707,546	'
Other consumer [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Balance, beginning of period	'	'	240	132	'
Charge-offs	'	'	-72	-143	'
Recoveries	'	'	10	20	'
Provision	'	'	80	211	'
Balance, end of period	258	220	258	220	'
Individually evaluated for impairment	1	'	1	'	'
Collectively evaluated for impairment	257	220	257	220	'
Ending balance-total	21,227	'	21,227	'	16,402
Other consumer [Member] | Loans receivable [Member]	'	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'	'
Ending balance-total	21,227	17,150	21,227	17,150	'
Individually evaluated for impairment	3	'	3	'	'
Collectively evaluated for impairment	$21,224	$17,150	$21,224	$17,150	'

Loans_Summary_of_Credit_Qualit

Loans - Summary of Credit Quality Indicators on Company's Loan Portfolio (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	$2,577,084	$2,357,777
Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	289,382	212,520
Commercial real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	1,178,199	1,128,091
Consumer real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	126,368	117,653
Commercial and industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	961,908	883,111
Other consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	21,227	16,402
Pass and Pass/Watch [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	2,495,230	2,274,125
Pass and Pass/Watch [Member] | Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	276,453	197,951
Pass and Pass/Watch [Member] | Commercial real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	1,122,316	1,073,339
Pass and Pass/Watch [Member] | Consumer real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	122,006	113,037
Pass and Pass/Watch [Member] | Commercial and industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	953,411	873,547
Pass and Pass/Watch [Member] | Other consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	21,044	16,251
Special Mention Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	1,723	1,935
Special Mention Loans [Member] | Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	3	4
Special Mention Loans [Member] | Commercial real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	1,632	1,720
Special Mention Loans [Member] | Consumer real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	64	185
Special Mention Loans [Member] | Commercial and industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	16	17
Special Mention Loans [Member] | Other consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	8	9
Substandard Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	80,131	81,717
Substandard Loans [Member] | Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	12,926	14,475
Substandard Loans [Member] | Commercial real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	54,251	53,122
Substandard Loans [Member] | Consumer real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	4,298	4,431
Substandard Loans [Member] | Commercial and industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	8,481	9,547
Substandard Loans [Member] | Other consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	175	142
Doubtful [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	'	'
Doubtful [Member] | Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	'	'
Doubtful [Member] | Commercial real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	'	'
Doubtful [Member] | Consumer real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	'	'
Doubtful [Member] | Commercial and industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	'	'
Doubtful [Member] | Other consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	'	'

Loans_Additional_Information_D

Loans - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Receivables [Abstract]	'	'	'	'	'
Financing Receivable, Equal to Greater than 90 Days Past Due	$16,873,000	'	$16,873,000	'	$11,371,000
Average recorded investment in nonaccrual loan	18,200,000	'	18,200,000	'	17,900,000
Amount of interest income	'	'	500,000	'	1,000,000
Troubled debt restructurings	1,820,000	1,561,000	1,820,000	1,561,000	1,900,000
Nonaccrual TDRs	241,000	242,000	241,000	242,000	200,000
Troubled debt restructurings modified	0	0	0	0	'
Secured Tuition Loans [Member]	'	'	'	'	'
Receivables [Abstract]	'	'	'	'	'
Financing Receivable, Equal to Greater than 90 Days Past Due	0	'	0	'	200,000
Other consumer [Member]	'	'	'	'	'
Receivables [Abstract]	'	'	'	'	'
Financing Receivable, Equal to Greater than 90 Days Past Due	90,000	'	90,000	'	207,000
Other consumer [Member] | Secured Tuition Loans [Member]	'	'	'	'	'
Receivables [Abstract]	'	'	'	'	'
Financing Receivable, Equal to Greater than 90 Days Past Due	0	'	0	'	200,000
Substandard Loans [Member]	'	'	'	'	'
Receivables [Abstract]	'	'	'	'	'
Loans acquired with deteriorated credit quality	5,600,000	'	5,600,000	'	7,400,000
Special Mention Loans [Member]	'	'	'	'	'
Receivables [Abstract]	'	'	'	'	'
Loans acquired with deteriorated credit quality	$0	'	$0	'	$1,600,000

Loans_Age_Analysis_of_Past_Due

Loans - Age Analysis of Past Due Loans Including Loans Acquired with Deteriorated Credit Quality (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Greater Than 30 and Fewer Than 90 Days Past Due	$4,255	$7,774
90 Days and Greater Past Due	16,873	11,371
Total Past Due	21,128	19,145
Current Loans	2,555,956	2,338,632
Loans, gross	2,577,084	2,357,777
Total real estate loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Greater Than 30 and Fewer Than 90 Days Past Due	2,505	4,210
90 Days and Greater Past Due	12,380	9,883
Total Past Due	14,885	14,093
Current Loans	1,579,064	1,444,171
Loans, gross	1,593,949	1,458,264
Other loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Greater Than 30 and Fewer Than 90 Days Past Due	1,750	3,564
90 Days and Greater Past Due	4,493	1,488
Total Past Due	6,243	5,052
Current Loans	976,892	894,461
Loans, gross	983,135	899,513
Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Greater Than 30 and Fewer Than 90 Days Past Due	601	15
90 Days and Greater Past Due	175	75
Total Past Due	776	90
Current Loans	288,606	212,430
Loans, gross	289,382	212,520
Commercial real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Greater Than 30 and Fewer Than 90 Days Past Due	225	2,935
90 Days and Greater Past Due	9,970	7,642
Total Past Due	10,195	10,577
Current Loans	1,168,004	1,117,514
Loans, gross	1,178,199	1,128,091
Consumer real estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Greater Than 30 and Fewer Than 90 Days Past Due	1,679	1,260
90 Days and Greater Past Due	2,235	2,166
Total Past Due	3,914	3,426
Current Loans	122,454	114,227
Loans, gross	126,368	117,653
Commercial and industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Greater Than 30 and Fewer Than 90 Days Past Due	1,476	3,076
90 Days and Greater Past Due	4,403	1,281
Total Past Due	5,879	4,357
Current Loans	956,029	878,754
Loans, gross	961,908	883,111
Other consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Greater Than 30 and Fewer Than 90 Days Past Due	274	488
90 Days and Greater Past Due	90	207
Total Past Due	364	695
Current Loans	20,863	15,707
Loans, gross	$21,227	$16,402

Loans_Summary_of_Information_P

Loans - Summary of Information Pertaining to Impaired Loans (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
With no related allowance recorded, Recorded Investment	$9,349	'	$9,349	'	$3,300
With no related allowance recorded, Contractual Balance	9,734	'	9,734	'	3,440
With no related allowance recorded, Related Allowance	'	'	'	'	'
With an allowance recorded, Recorded Investment	10,771	'	10,771	'	18,013
With an allowance recorded, Contractual Balance	11,062	'	11,062	'	18,042
With an allowance recorded, Related Allowance	5,170	'	5,170	'	6,942
Total impaired loans, Recorded Investment	20,120	'	20,120	'	21,313
Total impaired loans, Contractual Balance	20,796	'	20,796	'	21,482
Total impaired loans, Related Allowance	5,170	'	5,170	'	6,942
With no related allowance recorded, Average Recorded Investment	8,527	4,824	8,342	4,203	'
With no related allowance recorded, Interest Income Recognized	41	62	150	103	'
With an allowance recorded, Average Recorded Investment	10,910	11,448	10,279	4,203	'
With an allowance recorded, Interest Income Recognized	6	223	150	103	'
Total impaired loans, Average Recorded Investment	19,437	16,272	18,621	17,596	'
Total impaired loans, Interest Income Recognized	47	285	174	359	'
Construction [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
With no related allowance recorded, Recorded Investment	48	'	48	'	48
With no related allowance recorded, Contractual Balance	48	'	48	'	48
With no related allowance recorded, Related Allowance	'	'	'	'	'
With an allowance recorded, Recorded Investment	255	'	255	'	751
With an allowance recorded, Contractual Balance	255	'	255	'	751
With an allowance recorded, Related Allowance	33	'	33	'	176
Total impaired loans, Recorded Investment	303	'	303	'	799
Total impaired loans, Contractual Balance	303	'	303	'	799
Total impaired loans, Related Allowance	33	'	33	'	176
With no related allowance recorded, Average Recorded Investment	48	48	24	48	'
With no related allowance recorded, Interest Income Recognized	1	'	1	1	'
With an allowance recorded, Average Recorded Investment	311	753	283	48	'
With an allowance recorded, Interest Income Recognized	3	11	1	1	'
Total impaired loans, Average Recorded Investment	359	801	307	801	'
Total impaired loans, Interest Income Recognized	4	11	12	1	'
Commercial real estate [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
With no related allowance recorded, Recorded Investment	6,836	'	6,836	'	1,864
With no related allowance recorded, Contractual Balance	7,209	'	7,209	'	1,984
With no related allowance recorded, Related Allowance	'	'	'	'	'
With an allowance recorded, Recorded Investment	5,973	'	5,973	'	3,339
With an allowance recorded, Contractual Balance	6,187	'	6,187	'	3,367
With an allowance recorded, Related Allowance	1,772	'	1,772	'	548
Total impaired loans, Recorded Investment	12,809	'	12,809	'	5,203
Total impaired loans, Contractual Balance	13,396	'	13,396	'	5,351
Total impaired loans, Related Allowance	1,772	'	1,772	'	548
With no related allowance recorded, Average Recorded Investment	5,716	1,903	5,549	1,953	'
With no related allowance recorded, Interest Income Recognized	35	47	116	65	'
With an allowance recorded, Average Recorded Investment	6,408	4,390	5,764	1,953	'
With an allowance recorded, Interest Income Recognized	'	211	116	65	'
Total impaired loans, Average Recorded Investment	12,124	6,293	11,313	6,212	'
Total impaired loans, Interest Income Recognized	35	258	119	276	'
Consumer real estate [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
With no related allowance recorded, Recorded Investment	1,981	'	1,981	'	534
With no related allowance recorded, Contractual Balance	1,993	'	1,993	'	534
With no related allowance recorded, Related Allowance	'	'	'	'	'
With an allowance recorded, Recorded Investment	586	'	586	'	644
With an allowance recorded, Contractual Balance	611	'	611	'	644
With an allowance recorded, Related Allowance	964	'	964	'	765
Total impaired loans, Recorded Investment	2,567	'	2,567	'	1,178
Total impaired loans, Contractual Balance	2,604	'	2,604	'	1,178
Total impaired loans, Related Allowance	964	'	964	'	765
With no related allowance recorded, Average Recorded Investment	1,981	1,566	1,977	1,191	'
With no related allowance recorded, Interest Income Recognized	'	7	'	7	'
With an allowance recorded, Average Recorded Investment	652	1,075	802	1,191	'
With an allowance recorded, Interest Income Recognized	3	1	'	7	'
Total impaired loans, Average Recorded Investment	2,633	2,641	2,779	2,050	'
Total impaired loans, Interest Income Recognized	3	8	10	9	'
Commercial and industrial [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
With no related allowance recorded, Recorded Investment	484	'	484	'	854
With no related allowance recorded, Contractual Balance	484	'	484	'	874
With no related allowance recorded, Related Allowance	'	'	'	'	'
With an allowance recorded, Recorded Investment	3,954	'	3,954	'	13,279
With an allowance recorded, Contractual Balance	4,006	'	4,006	'	13,280
With an allowance recorded, Related Allowance	2,400	'	2,400	'	5,453
Total impaired loans, Recorded Investment	4,438	'	4,438	'	14,133
Total impaired loans, Contractual Balance	4,490	'	4,490	'	14,154
Total impaired loans, Related Allowance	2,400	'	2,400	'	5,453
With no related allowance recorded, Average Recorded Investment	782	1,307	792	1,011	'
With no related allowance recorded, Interest Income Recognized	5	8	33	30	'
With an allowance recorded, Average Recorded Investment	3,536	5,230	3,430	1,011	'
With an allowance recorded, Interest Income Recognized	'	'	33	30	'
Total impaired loans, Average Recorded Investment	4,318	6,537	4,222	8,533	'
Total impaired loans, Interest Income Recognized	5	8	33	73	'
Other consumer [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
With no related allowance recorded, Recorded Investment	'	'	'	'	'
With no related allowance recorded, Contractual Balance	'	'	'	'	'
With no related allowance recorded, Related Allowance	'	'	'	'	'
With an allowance recorded, Recorded Investment	3	'	3	'	'
With an allowance recorded, Contractual Balance	3	'	3	'	'
With an allowance recorded, Related Allowance	1	'	1	'	'
Total impaired loans, Recorded Investment	3	'	3	'	'
Total impaired loans, Contractual Balance	3	'	3	'	'
Total impaired loans, Related Allowance	1	'	1	'	'
With no related allowance recorded, Average Recorded Investment	'	'	'	'	'
With no related allowance recorded, Interest Income Recognized	'	'	'	'	'
With an allowance recorded, Average Recorded Investment	3	'	'	'	'
With an allowance recorded, Interest Income Recognized	'	'	'	'	'
Total impaired loans, Average Recorded Investment	3	'	'	'	'
Total impaired loans, Interest Income Recognized	'	'	'	'	'

Loans_Summary_of_Nonaccrual_Lo

Loans - Summary of Nonaccrual Loans (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Loans Receivable [Line Items]	'	'
Nonaccrual loans	$20,218	$16,396
Nonaccrual Loans [Member] | Construction [Member]	'	'
Loans Receivable [Line Items]	'	'
Nonaccrual loans	174	75
Nonaccrual Loans [Member] | Commercial real estate [Member]	'	'
Loans Receivable [Line Items]	'	'
Nonaccrual loans	13,205	10,133
Nonaccrual Loans [Member] | Consumer real estate [Member]	'	'
Loans Receivable [Line Items]	'	'
Nonaccrual loans	2,393	2,347
Nonaccrual Loans [Member] | Commercial and industrial [Member]	'	'
Loans Receivable [Line Items]	'	'
Nonaccrual loans	4,343	3,784
Nonaccrual Loans [Member] | Other consumer [Member]	'	'
Loans Receivable [Line Items]	'	'
Nonaccrual loans	$103	$57

Loans_Changes_in_Carrying_Amou

Loans -Changes in Carrying Amount of Accretable Yield for Purchased Credit Impaired Loans Acquired (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Receivables [Abstract]	'	'
Balance, beginning of period	$170	$628
Acquisition	'	'
Net transfers from nonaccretable difference to accretable yield	816	45
Accretion	-777	-323
Balance, end of period	$209	$350

Loans_Summary_of_Companys_Trou

Loans - Summary of Company's Troubled Debt Restructurings ("TDRs') (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'	'
Current	$1,579	'	$1,319
Greater than 30 Days Past Due	'	'	'
Nonaccrual TDRs	241	200	242
Total Loans	1,820	1,900	1,561
Total real estate loans [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Current	1,274	'	958
Greater than 30 Days Past Due	'	'	'
Nonaccrual TDRs	241	'	242
Total Loans	1,515	'	1,200
Total real estate loans [Member] | Construction [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Current	303	'	47
Greater than 30 Days Past Due	'	'	'
Nonaccrual TDRs	'	'	'
Total Loans	303	'	47
Total real estate loans [Member] | Commercial real estate [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Current	355	'	275
Greater than 30 Days Past Due	'	'	'
Nonaccrual TDRs	102	'	101
Total Loans	457	'	376
Total real estate loans [Member] | Consumer real estate [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Current	616	'	636
Greater than 30 Days Past Due	'	'	'
Nonaccrual TDRs	139	'	141
Total Loans	755	'	777
Other loans [Member] | Commercial and industrial [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Current	305	'	361
Greater than 30 Days Past Due	'	'	'
Nonaccrual TDRs	'	'	'
Total Loans	$305	'	$361

Loans_Summary_of_Information_P1

Loans - Summary of Information Pertaining to Modified Terms of Loans (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	9	8
Pre- Modification Outstanding Recorded Investment	$1,820	$1,561
Post- Modification Outstanding Recorded Investment	1,820	1,561
Troubled debt restructuring [Member] | Construction [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	2	1
Pre- Modification Outstanding Recorded Investment	303	47
Post- Modification Outstanding Recorded Investment	303	47
Troubled debt restructuring [Member] | Commercial real estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	3	3
Pre- Modification Outstanding Recorded Investment	457	376
Post- Modification Outstanding Recorded Investment	457	376
Troubled debt restructuring [Member] | Consumer real estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	3	3
Pre- Modification Outstanding Recorded Investment	755	777
Post- Modification Outstanding Recorded Investment	755	777
Troubled debt restructuring [Member] | Commercial and industrial [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	1	1
Pre- Modification Outstanding Recorded Investment	305	361
Post- Modification Outstanding Recorded Investment	$305	$361

Investments_in_Tax_Credit_Enti1

Investments in Tax Credit Entities - Additional Information (Detail) (USD $)

3 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

12 Months Ended

36 Months Ended

6 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Due Between One Year And Three Years [Member]

Due Between Year Four And Year Seven [Member]

Maximum [Member]

Federal New Markets Tax Credits (NMTC) [Member]

Federal New Markets Tax Credits (NMTC) [Member]

Federal New Markets Tax Credits (NMTC) [Member]

State [Member]

Lender [Member]

Community Development Fund [Member]

Certified Development Entities [Member]

Certified Development Entities [Member]

Certified Development Entities [Member]

Certified Development Entities [Member]

Certified Development Entities [Member]

Low-Income Housing investment tax credit [Member]

Low-Income Housing investment tax credit [Member]

Federal Historic Rehabilitation Tax Credits [Member]

Federal Historic Rehabilitation Tax Credits [Member]

Development Entities [Member]

Development Entities [Member]

Investment In Limited Partnership [Member]

Investment In Limited Partnership [Member]

Federal New Markets Tax Credits (NMTC) [Member]

Net Investment Income [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Received allocation amount

'

'

'

'

'

'

'

$46,000,000

'

$118,000,000

$118,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Generated Tax credits

3,377,000

2,104,000

6,204,000

3,891,000

'

'

'

'

'

'

46,000,000

'

'

'

44,600,000

'

'

'

'

'

'

27,000,000

'

'

'

Investments in QEI projects

'

'

'

'

'

'

'

'

'The CDE is required to invest the proceeds of each QEI in projects located in or benefitting low-income communities, which are generally defined as those census tracts with poverty rates greater than 20% and/or median family incomes that are less than or equal to 80% of the area median family income

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CDE investments in QEI projects located in low-income communities with poverty rates

'

'

'

'

'

'

'

'

20.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CDE investments in QEI projects located in low-income communities with median family income

'

'

'

'

'

'

'

'

80.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tax credit as Percentage of project cost

'

'

39.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit allowance period

'

'

'7 years

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investor receives a credit equal to the total amount invested in the project

'

'

'

'

'

5.00%

6.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Qualified Equity Investments

118,000,000

'

118,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CDE gross amount

118,000,000

'

118,000,000

'

'

'

'

'

'

'

'

42,600,000

75,400,000

'

'

'

'

'

'

'

'

'

'

'

'

Investments generated recognized

'

'

'

'

'

'

'

'

'

46,000,000

'

'

'

'

'

'

'

'

60,500,000

'

'

'

'

'

'

Investments generated recognized

'

'

'

'

'

'

'

'

'

10,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected NMTC for year 2014

'

'

'

'

'

'

'

'

6,100,000

'

'

'

'

'

'

'

'

'

'

3,500,000

'

9,200,000

'

'

'

Accrued Tax Credit

'

'

'

'

'

'

'

'

'

29,500,000

'

'

'

'

'

'

24,100,000

'

'

42,300,000

'

'

'

'

'

Qualified Equity Investment low Income community investment percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

'

'

'

'

'

'

'

'

Loans related to real estate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

41,900,000

45,300,000

'

'

'

'

'

'

'

47,500,000

36,500,000

Total assets

3,568,408,000

'

3,568,408,000

'

3,286,617,000

'

'

'

'

'

'

'

'

'

122,100,000

'

'

'

'

'

'

'

'

'

'

Cash

38,660,000

'

38,660,000

'

28,140,000

'

'

'

'

'

'

'

'

'

7,600,000

'

'

'

'

'

'

'

'

'

'

Loans

2,539,681,000

'

2,539,681,000

'

2,325,634,000

'

'

'

'

'

'

'

'

'

108,300,000

'

'

'

'

'

'

'

'

'

'

Other assets

26,827,000

'

26,827,000

'

23,781,000

'

'

'

'

'

'

'

'

'

6,200,000

'

'

'

'

'

'

'

'

'

'

Liabilities

3,159,234,000

'

3,159,234,000

'

2,904,758,000

'

'

'

'

'

'

'

'

'

300,000

'

'

'

'

'

'

'

'

'

'

Capital

'

'

'

'

'

'

'

'

'

'

'

'

'

'

121,800,000

'

'

'

'

'

'

'

'

'

'

Investments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

44,600,000

'

'

'

'

37,600,000

40,000,000

24,100,000

16,500,000

'

'

Tax credits recognized

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,200,000

27,200,000

'

'

9,500,000

'

17,800,000

'

'

Investment in partnership expected to generate Low-Income Housing tax credit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

55,300,000

'

'

'

'

'

Interest in property

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

99.99%

'

99.90%

'

'

'

Property investment term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'15 years

'

'10 years

'

'

'

Loans related to real estate projects

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$41,900,000

$42,000,000

$3,300,000

'

'

'

Derivative_Interest_Rate_Swap_1

Derivative - Interest Rate Swap Agreements - Additional Information (Detail) (USD $)

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Prime Swaps [Member]

Prime Swaps [Member]

Delayed Interest Rate Swap [Member]

Delayed Interest Rate Swap [Member]

Counterparty B [Member]

Counterparty A [Member]

Counterparty A [Member]

Prime Rate [Member]

Prime plus 1% [Member]

Prime plus 1% floored at 5% [Member]

Prime plus 1% floored at 5.5% [Member]

Prime plus 1% floored at 5.5% [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Prime Swaps [Member]

Interest Rate Derivatives Outstanding [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional amount of derivative contract

'

'

'

'

'

'

'

$150,000,000

'

$115,000,000

'

'

'

'

$250,000,000

Gain loss after income tax recognized in other comprehensive income

'

4,400,000

'

'

'

'

'

'

3,300,000

'

'

'

'

'

'

Fair Value of Derivative Liabilities

3,900,000

'

'

8,100,000

'

10,200,000

'

'

'

'

'

'

'

'

'

Fair Value of Derivative Assets

'

'

1,200,000

2,100,000

'

'

'

'

'

'

'

'

'

'

'

Amounts of gains or losses have been reclassified from accumulated comprehensive income

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

Investment securities principal amount

12,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of investment securities

12,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument description of variable rate basis

'

'

'

'

'

'

'

'

'

'

'Prime

'Prime plus 1%

'Prime plus 1% floored at 5%

'Prime plus 1% floored at 5.5%

'

Debt instrument basis spread on variable rate

'

'

'

'

'

'

'

'

'

'

1.00%

1.00%

1.00%

1.00%

'

Debt instrument interest floored rate

'

'

'

'

'

'

'

'

'

'

'

'

5.00%

5.50%

'

Amount of derivative will mature within next 12 months

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss recognized in other comprehensive income

2,500,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Liability, Fair Value

'

'

'

'

2,300,000

'

2,000,000

'

'

'

'

'

'

'

'

Financial Instruments Owned and Pledged as Collateral

82,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Financial Instruments, Owned and Pledged as Collateral, at Fair Value

$79,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Summary_of_Income

Income Taxes - Summary of Income Tax Benefit on Statement of Income (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Current tax benefit	'	'	'	'
Deferred tax benefit	'	'	-9,742	-8,211
Total tax benefit	($4,784)	($4,198)	($9,742)	($8,211)

Commitments_and_Contingencies_1

Commitments and Contingencies - Summary of Total Notional Amount of Loan Commitments and Standby Letters of Credit (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'	'
Standby letters of credit	$111,576	$106,467
Unused loan commitments	394,460	268,760
Total	$506,036	$375,227

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance	'	'	($16,515)	($2,926)
Net change in unrealized gain (loss)	'	'	957	-10,126
Reclassification of net gains realized and included in earnings	-56	'	-56	-305
Amortization of unrealized net gain (loss) on securities	165	'	269	'
Income tax expense (benefit)	231	-3,217	410	-3,651
Ending balance	-15,755	-9,706	-15,755	-9,706
Cash Flow Hedge [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance	'	'	-2,054	-4,455
Net change in unrealized gain (loss)	'	'	-8,767	6,798
Reclassification of net gains realized and included in earnings	'	'	'	'
Amortization of unrealized net gain (loss) on securities	'	'	'	'
Income tax expense (benefit)	'	'	-3,069	2,379
Ending balance	-7,752	-36	-7,752	-36
Transfers of Available for Sale Securities to Held to Maturity [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance	'	'	-3,710	'
Net change in unrealized gain (loss)	'	'	'	'
Reclassification of net gains realized and included in earnings	'	'	'	'
Amortization of unrealized net gain (loss) on securities	'	'	269	'
Income tax expense (benefit)	'	'	94	'
Ending balance	-3,535	'	-3,535	'
Available-for-sale securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance	'	'	-10,751	1,529
Net change in unrealized gain (loss)	'	'	9,724	-16,924
Reclassification of net gains realized and included in earnings	'	'	-56	-305
Amortization of unrealized net gain (loss) on securities	'	'	'	'
Income tax expense (benefit)	'	'	3,385	-6,030
Ending balance	($4,468)	($9,670)	($4,468)	($9,670)

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Carrying Value and Fair Value Measurements of Financial Assets and Liabilities on Recurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available for sale securities:	'	'
Available for sale securities	$280,991	$277,719
Derivative instruments	'	1,200
Liabilities	'	'
Derivative instruments	3,900	'
U.S. government agency securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	148,214	151,323
U.S. Treasury securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	12,474	12,149
Municipal securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	18,791	23,167
Mortgage-backed securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	64,960	55,544
Corporate bonds [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	36,552	35,536
Significant Other Observable Inputs (Level 2) [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	280,991	277,719
Derivative instruments	'	1,157
Liabilities	'	'
Derivative instruments	11,926	4,317
Significant Unobservable Inputs (Level 3) [Member]	'	'
Available for sale securities:	'	'
Total	14,472	12,172
Fair Value, Measurements, Recurring [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	280,991	277,719
Derivative instruments	'	1,157
Total	'	278,876
Liabilities	'	'
Derivative instruments	11,926	4,317
Fair Value, Measurements, Recurring [Member] | U.S. government agency securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	148,214	151,323
Fair Value, Measurements, Recurring [Member] | U.S. Treasury securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	12,474	12,149
Fair Value, Measurements, Recurring [Member] | Municipal securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	18,791	23,167
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	64,960	55,544
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	36,552	35,536
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Derivative instruments	'	'
Total	'	'
Liabilities	'	'
Derivative instruments	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. government agency securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Municipal securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-backed securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate bonds [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	280,991	277,719
Derivative instruments	'	1,157
Total	'	278,876
Liabilities	'	'
Derivative instruments	11,926	4,317
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. government agency securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	148,214	151,323
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	12,474	12,149
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipal securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	18,791	23,167
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	64,960	55,544
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate bonds [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	36,552	35,536
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Derivative instruments	'	'
Total	'	'
Liabilities	'	'
Derivative instruments	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. government agency securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Municipal securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage-backed securities [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate bonds [Member]	'	'
Available for sale securities:	'	'
Available for sale securities	'	'

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments - Carrying Value and Fair Value Measurements of Financial Assets and Liabilities on Non Recurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Measurements, Nonrecurring [Member]	'	'
Assets	'	'
Loans	$10,772	$9,782
OREO	3,700	2,390
Total	14,472	12,172
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member]	'	'
Assets	'	'
Loans	'	'
OREO	'	'
Total	'	'
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member]	'	'
Assets	'	'
Loans	'	'
OREO	'	'
Total	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets	'	'
Loans	10,772	9,782
OREO	3,700	2,390
Total	$14,472	$12,172

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments - Carrying Value and Fair Value Measurements of Financial Instruments (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and due from banks	$38,660	$28,140
Short-term investments	24,790	3,502
Investment in short-term receivables	252,460	246,817
Investment securities available for sale	280,991	277,719
Investment securities held to maturity	91,075	94,904
Loans and loans held for sale	5,264	6,577
Cash surrender value of bank-owned life insurance	46,583	26,187
Derivative instruments	'	1,200
Deposits, noninterest-bearing	340,716	291,080
Deposits, interest-bearing	2,616,803	2,439,727
Short-term borrowings and repurchase agreements	106,393	75,957
Long-term borrowings	55,110	55,110
Derivative instruments	3,900	'
Total Fair Value [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and due from banks	38,660	28,140
Short-term investments	24,790	3,502
Investment in short-term receivables	252,460	246,817
Investment securities available for sale	280,991	277,719
Investment securities held to maturity	91,446	90,966
Loans and loans held for sale	2,782,833	2,344,475
Cash surrender value of bank-owned life insurance	46,583	26,187
Derivative instruments	'	1,157
Deposits, noninterest-bearing	340,716	291,080
Deposits, interest-bearing	2,600,965	2,380,985
Short-term borrowings and repurchase agreements	106,393	84,382
Long-term borrowings	57,628	55,616
Derivative instruments	11,926	4,317
Carrying Amount [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and due from banks	38,660	28,140
Short-term investments	24,790	3,502
Investment in short-term receivables	252,460	246,817
Investment securities available for sale	280,991	277,719
Investment securities held to maturity	91,075	94,904
Loans and loans held for sale	2,582,348	2,364,354
Cash surrender value of bank-owned life insurance	46,583	26,187
Derivative instruments	'	1,157
Deposits, noninterest-bearing	340,716	291,080
Deposits, interest-bearing	2,616,803	2,439,727
Short-term borrowings and repurchase agreements	106,393	84,382
Long-term borrowings	55,110	55,110
Derivative instruments	11,926	4,317
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash and due from banks	38,660	28,140
Short-term investments	24,790	3,502
Investment in short-term receivables	252,460	246,817
Cash surrender value of bank-owned life insurance	46,583	26,187
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investment securities available for sale	280,991	277,719
Investment securities held to maturity	91,446	90,966
Derivative instruments	'	1,157
Deposits, noninterest-bearing	340,716	291,080
Short-term borrowings and repurchase agreements	106,393	84,382
Derivative instruments	11,926	4,317
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loans and loans held for sale	2,782,833	2,344,475
Deposits, interest-bearing	2,600,965	2,380,985
Long-term borrowings	$57,628	$55,616