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Loans - Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance $ 16,674 $ 13,897 $ 16,234 $ 14,060
Charge-offs (830) (1,583) (1,480) (2,752)
Recoveries 70 71 141 147
Provision (benefit) for loan losses 1,501 3,115 2,520 4,045
Allowances for loan losses, Ending Balance 17,415 15,500 17,415 15,500
Commercial, Industrial, and Agricultural [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 8,278 5,271 8,212 4,940
Charge-offs (319) (84) (319) (84)
Recoveries 1 7 1 7
Provision (benefit) for loan losses 136 144 202 475
Allowances for loan losses, Ending Balance 8,096 5,338 8,096 5,338
Commercial Mortgages [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 3,704 4,299 3,536 4,697
Charge-offs 0 (923) (50) (1,530)
Recoveries 10 2 10 3
Provision (benefit) for loan losses 867 2,518 1,085 2,726
Allowances for loan losses, Ending Balance 4,581 5,896 4,581 5,896
Residential Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 2,455 2,395 2,450 2,466
Charge-offs (76) (169) (198) (341)
Recoveries 0 3 19 4
Provision (benefit) for loan losses 88 279 196 379
Allowances for loan losses, Ending Balance 2,467 2,508 2,467 2,508
Consumer [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 1,972 1,707 1,763 1,699
Charge-offs (369) (346) (768) (677)
Recoveries 31 33 53 74
Provision (benefit) for loan losses 362 161 948 459
Allowances for loan losses, Ending Balance 1,996 1,555 1,996 1,555
Credit Cards [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 68 77 66 83
Charge-offs (2) (17) (23) (29)
Recoveries 1 8 3 10
Provision (benefit) for loan losses 21 (13) 42 (9)
Allowances for loan losses, Ending Balance 88 55 88 55
Overdrafts [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowances for loan losses, Beginning Balance 197 148 207 175
Charge-offs (64) (44) (122) (91)
Recoveries 27 18 55 49
Provision (benefit) for loan losses 27 26 47 15
Allowances for loan losses, Ending Balance $ 187 $ 148 $ 187 $ 148