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Loans - Loans Individually Evaluated for Impairment by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, Total	$ 29,571	$ 29,225
Recorded Investment, Total	25,314	25,520
Allowance for Loan Losses Allocated	2,701	1,852
Commercial, Industrial, and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, Related Allowance	1,843	2,542
Recorded Investment, Related Allowance	1,449	1,792
Allowance for Loan Losses Allocated	612	541
Unpaid Principal Balance, No Related Allowance	2,679	2,804
Recorded Investment, No Related Allowance	2,118	2,251
Allowance for Loan Losses Allocated, No Related Allowance	0	0
Commercial Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, Related Allowance	8,138	5,870
Recorded Investment, Related Allowance	6,689	5,329
Allowance for Loan Losses Allocated	2,089	1,230
Unpaid Principal Balance, No Related Allowance	16,758	17,285
Recorded Investment, No Related Allowance	14,984	15,555
Allowance for Loan Losses Allocated, No Related Allowance	0	0
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, Related Allowance	0	416
Recorded Investment, Related Allowance	0	381
Allowance for Loan Losses Allocated	0	81
Unpaid Principal Balance, No Related Allowance	153	308
Recorded Investment, No Related Allowance	74	212
Allowance for Loan Losses Allocated, No Related Allowance	$ 0	$ 0

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Impaired loans without allowance.

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+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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