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Loans - Loans Individually Evaluated for Impairment by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, Total	$ 22,852	$ 29,225
Recorded Investment, Total	19,345	25,520
Allowance for Loan Losses Allocated	3,405	1,852
Commercial, Industrial, and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, Related Allowance	1,836	2,542
Recorded Investment, Related Allowance	1,085	1,792
Allowance for Loan Losses Allocated	573	541
Unpaid Principal Balance, No Related Allowance	2,604	2,804
Recorded Investment, No Related Allowance	1,991	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	12,017	5,870
Recorded Investment, Related Allowance	9,985	5,329
Allowance for Loan Losses Allocated	2,832	1,230
Unpaid Principal Balance, No Related Allowance	6,246	17,285
Recorded Investment, No Related Allowance	6,220	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	149	308
Recorded Investment, No Related Allowance	64	212
Allowance for Loan Losses Allocated, No Related Allowance	$ 0	$ 0

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Impaired loans without allowance.

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