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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 397		$ 1,023
Collectively evaluated for impairment	14,096		13,245
Ending balance	14,707	$ 14,315	14,268	$ 15,395	$ 16,767	$ 16,528
Individually evaluated for impairment	9,873		11,149
Collectively evaluated for impairment	992,597		903,708
Ending balance	1,002,917		914,857
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with credit deterioration	214
Loan balance of loans acquired with credit deterioration	447
Commercial and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	137		641
Collectively evaluated for impairment	1,167		1,181
Ending balance	1,395	1,794	1,822	2,067	2,607	2,841
Individually evaluated for impairment	1,223		2,304
Collectively evaluated for impairment	127,546		111,882
Ending balance	128,972		114,186
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with credit deterioration	91
Loan balance of loans acquired with credit deterioration	203
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	4		57
Collectively evaluated for impairment	5,423		2,523
Ending balance	5,427	2,608	2,580	3,135	3,829	3,263
Individually evaluated for impairment	4,290		3,557
Collectively evaluated for impairment	165,277		139,457
Ending balance	169,600		143,014
Commercial Real Estate Owner Occupied [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance of loans acquired with credit deterioration	33
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment			20
Collectively evaluated for impairment	3,383		4,778
Ending balance	3,383	4,926	4,798	4,853	4,168	4,296
Individually evaluated for impairment	1,913		2,175
Collectively evaluated for impairment	329,917		306,491
Ending balance	331,830		308,666
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	255		305
Collectively evaluated for impairment	3,092		3,442
Ending balance	3,470	3,666	3,747	4,439	5,050	5,224
Individually evaluated for impairment	2,403		3,108
Collectively evaluated for impairment	279,998		265,402
Ending balance	282,612		268,510
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with credit deterioration	123
Loan balance of loans acquired with credit deterioration	211
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	1
Collectively evaluated for impairment	433		428
Ending balance	434	498	428	287	295	184
Individually evaluated for impairment	40
Collectively evaluated for impairment	68,694		65,452
Ending balance	68,734		65,452
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	190		196
Ending balance	190	186	196	196	239	214
Individually evaluated for impairment	4		5
Collectively evaluated for impairment	21,165		15,024
Ending balance	21,169		15,029
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	408		697
Ending balance	$ 408	$ 637	$ 697	$ 418	$ 579	$ 506

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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