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Loans - Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance $ 15,500 $ 13,690 $ 14,060 $ 12,615
Charge-offs (590) (1,277) (3,342) (3,172)
Recoveries 1,465 48 1,612 168
Provision (benefit) for loan losses 846 1,188 4,891 4,038
Allowances for loan losses, Ending Balance 17,221 13,649 17,221 13,649
Commercial, Industrial, and Agricultural [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 5,338 5,115 4,940 4,511
Charge-offs (169) (751) (253) (1,398)
Recoveries 0 6 7 14
Provision (benefit) for loan losses 384 103 859 1,346
Allowances for loan losses, Ending Balance 5,553 4,473 5,553 4,473
Commercial Mortgages [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 5,896 4,553 4,697 4,470
Charge-offs (4) (165) (1,534) (401)
Recoveries 1,424 0 1,427 0
Provision (benefit) for loan losses (275) 504 2,451 823
Allowances for loan losses, Ending Balance 7,041 4,892 7,041 4,892
Residential Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 2,508 2,225 2,466 1,991
Charge-offs (57) (7) (398) (231)
Recoveries 1 1 5 1
Provision (benefit) for loan losses 189 113 568 571
Allowances for loan losses, Ending Balance 2,641 2,332 2,641 2,332
Consumer [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 1,555 1,568 1,699 1,404
Charge-offs (269) (252) (946) (890)
Recoveries 21 18 95 67
Provision (benefit) for loan losses 454 372 913 1,125
Allowances for loan losses, Ending Balance 1,761 1,706 1,761 1,706
Credit Cards [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 55 81 83 71
Charge-offs (19) (22) (48) (55)
Recoveries 3 1 13 8
Provision (benefit) for loan losses 18 19 9 55
Allowances for loan losses, Ending Balance 57 79 57 79
Overdrafts [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 148 148 175 168
Charge-offs (72) (80) (163) (197)
Recoveries 16 22 65 78
Provision (benefit) for loan losses 76 77 91 118
Allowances for loan losses, Ending Balance $ 168 $ 167 $ 168 $ 167