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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	$ 847	$ 427
Allowance for loan losses, Collectively evaluated for impairment	14,447	14,352
Acquired with deteriorated credit quality	0	0
Allowance for loan losses, Modified in a troubled debt restructuring	1,380	1,455
Total ending allowance balance	16,674	16,234	13,897	14,060
Loans:
Loans individually evaluated for impairment	5,710	6,172
Loans collectively evaluated for impairment	1,278,024	1,278,726
Acquired with deteriorated credit quality	2,195	2,225
Loans modified in a troubled debt restructuring	11,945	12,136
Total ending loans balance	1,297,874	1,299,259
Commercial, Industrial, and Agricultural [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	847	372
Allowance for loan losses, Collectively evaluated for impairment	6,168	5,907
Acquired with deteriorated credit quality	0	0
Allowance for loan losses, Modified in a troubled debt restructuring	113	115
Total ending allowance balance	7,128	6,394	5,271	4,940
Loans:
Loans individually evaluated for impairment	5,122	4,923
Loans collectively evaluated for impairment	354,273	351,002
Acquired with deteriorated credit quality	0	0
Loans modified in a troubled debt restructuring	1,745	1,790
Total ending loans balance	361,140	357,715
Commercial Mortgages [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	55
Allowance for loan losses, Collectively evaluated for impairment	3,467	3,959
Acquired with deteriorated credit quality	0	0
Allowance for loan losses, Modified in a troubled debt restructuring	1,267	1,340
Total ending allowance balance	4,734	5,354	4,299	4,697
Loans:
Loans individually evaluated for impairment	588	1,249
Loans collectively evaluated for impairment	396,777	399,645
Acquired with deteriorated credit quality	2,195	2,225
Loans modified in a troubled debt restructuring	10,200	10,346
Total ending loans balance	409,760	413,465
Residential Real Estate [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	2,575	2,880
Acquired with deteriorated credit quality	0	0
Allowance for loan losses, Modified in a troubled debt restructuring	0	0
Total ending allowance balance	2,575	2,880	2,395	2,466
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	459,667	459,114
Acquired with deteriorated credit quality	0	0
Loans modified in a troubled debt restructuring	0	0
Total ending loans balance	459,667	459,114
Consumer [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	1,972	1,333
Acquired with deteriorated credit quality	0	0
Allowance for loan losses, Modified in a troubled debt restructuring	0	0
Total ending allowance balance	1,972	1,333	1,707	1,699
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	62,007	63,491
Acquired with deteriorated credit quality	0	0
Loans modified in a troubled debt restructuring	0	0
Total ending loans balance	62,007	63,491
Credit Cards [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	68	66
Acquired with deteriorated credit quality	0	0
Allowance for loan losses, Modified in a troubled debt restructuring	0	0
Total ending allowance balance	68	66	77	83
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	4,879	5,065
Acquired with deteriorated credit quality	0	0
Loans modified in a troubled debt restructuring	0	0
Total ending loans balance	4,879	5,065
Overdrafts [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	197	207
Acquired with deteriorated credit quality	0	0
Allowance for loan losses, Modified in a troubled debt restructuring	0	0
Total ending allowance balance	197	207	148	175
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	421	409
Acquired with deteriorated credit quality	0	0
Loans modified in a troubled debt restructuring	0	0
Total ending loans balance	$ 421	$ 409

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Financing receivable allowance for credit losses modifications recorded investment.

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The balance of financing receivables that were acquired with deteriorated credit quality.

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-Publisher FASB

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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