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Loans - Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance $ 13,897 $ 13,015 $ 14,060 $ 12,615
Charge-offs (1,583) (1,126) (2,752) (1,895)
Recoveries 71 55 147 120
Provision (benefit) for loan losses 3,115 1,746 4,045 2,850
Allowances for loan losses, Ending Balance 15,500 13,690 15,500 13,690
Commercial, Industrial, and Agricultural [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 5,271 4,942 4,940 4,511
Charge-offs (84) (422) (84) (647)
Recoveries 7 5 7 8
Provision (benefit) for loan losses 144 590 475 1,243
Allowances for loan losses, Ending Balance 5,338 5,115 5,338 5,115
Commercial Mortgages [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 4,299 4,377 4,697 4,470
Charge-offs (923) (121) (1,530) (236)
Recoveries 2 0 3 0
Provision (benefit) for loan losses 2,518 297 2,726 319
Allowances for loan losses, Ending Balance 5,896 4,553 5,896 4,553
Residential Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 2,395 1,997 2,466 1,991
Charge-offs (169) (137) (341) (224)
Recoveries 3 0 4 0
Provision (benefit) for loan losses 279 365 379 458
Allowances for loan losses, Ending Balance 2,508 2,225 2,508 2,225
Consumer [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 1,707 1,435 1,699 1,404
Charge-offs (346) (382) (677) (638)
Recoveries 33 22 74 49
Provision (benefit) for loan losses 161 493 459 753
Allowances for loan losses, Ending Balance 1,555 1,568 1,555 1,568
Credit Cards [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 77 96 83 71
Charge-offs (17) (14) (29) (33)
Recoveries 8 6 10 7
Provision (benefit) for loan losses (13) (7) (9) 36
Allowances for loan losses, Ending Balance 55 81 55 81
Overdrafts [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 148 168 175 168
Charge-offs (44) (50) (91) (117)
Recoveries 18 22 49 56
Provision (benefit) for loan losses 26 8 15 41
Allowances for loan losses, Ending Balance $ 148 $ 148 $ 148 $ 148