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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 184		$ 1,023
Collectively evaluated for impairment	14,445		13,245
Ending balance	14,760	$ 14,707	14,268	$ 15,445	$ 15,395	$ 16,528
Individually evaluated for impairment	7,098		11,149
Collectively evaluated for impairment	992,750		903,708
Ending balance	1,000,275		914,857
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with credit deterioration	131
Loan balance of loans acquired with credit deterioration	427
Commercial and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	16		641
Collectively evaluated for impairment	1,371		1,181
Ending balance	1,387	1,395	1,822	1,605	2,067	2,841
Individually evaluated for impairment	894		2,304
Collectively evaluated for impairment	128,209		111,882
Ending balance	129,119		114,186
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance of loans acquired with credit deterioration	16
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	4		57
Collectively evaluated for impairment	2,942		2,523
Ending balance	2,946	3,383	2,580	2,866	3,135	3,263
Individually evaluated for impairment	2,626		3,557
Collectively evaluated for impairment	157,801		139,457
Ending balance	160,457		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	30
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment			20
Collectively evaluated for impairment	5,334		4,778
Ending balance	5,334	5,427	4,798	4,978	4,853	4,296
Individually evaluated for impairment	1,828		2,175
Collectively evaluated for impairment	338,874		306,491
Ending balance	340,702		308,666
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	164		305
Collectively evaluated for impairment	3,926		3,442
Ending balance	4,221	3,470	3,747	4,312	4,439	5,224
Individually evaluated for impairment	1,746		3,108
Collectively evaluated for impairment	282,772		265,402
Ending balance	284,899		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	131
Loan balance of loans acquired with credit deterioration	381
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	428		428
Ending balance	428	434	428	365	287	184
Collectively evaluated for impairment	67,461		65,452
Ending balance	67,461		65,452
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	365		196
Ending balance	365	190	196	215	196	214
Individually evaluated for impairment	4		5
Collectively evaluated for impairment	17,633		15,024
Ending balance	17,637		15,029
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	79		697
Ending balance	$ 79	$ 408	$ 697	$ 1,104	$ 418	$ 506

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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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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