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Loans - Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowances for loan losses, Beginning Balance       $ 14,060       $ 12,615 $ 14,060 $ 12,615 $ 10,820
Charge-offs                 (5,630) (5,190) (3,356)
Recoveries                 1,666 254 214
Provision for loan losses 1,247 846 3,115 930 2,343 1,188 1,746 1,104 6,138 6,381 4,937
Allowances for loan losses, Ending Balance 16,234       14,060       16,234 14,060 12,615
Commercial, Industrial, and Agricultural [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowances for loan losses, Beginning Balance       4,940       4,511 4,940 4,511 3,517
Charge-offs                 (958) (2,871) (1,796)
Recoveries                 7 45 9
Provision for loan losses                 2,290 3,255 2,781
Allowances for loan losses, Ending Balance 6,279       4,940       6,279 4,940 4,511
Commercial Mortgages [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowances for loan losses, Beginning Balance       4,697       4,470 4,697 4,470 3,511
Charge-offs                 (1,931) (401) (175)
Recoveries                 1,430 0 0
Provision for loan losses                 1,273 628 1,134
Allowances for loan losses, Ending Balance 5,469       4,697       5,469 4,697 4,470
Residential Real Estate [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowances for loan losses, Beginning Balance       2,466       1,991 2,466 1,991 1,916
Charge-offs                 (467) (304) (217)
Recoveries                 5 1 13
Provision for loan losses                 876 778 279
Allowances for loan losses, Ending Balance 2,880       2,466       2,880 2,466 1,991
Consumer [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowances for loan losses, Beginning Balance       1,699       1,404 1,699 1,404 1,561
Charge-offs                 (1,919) (1,279) (907)
Recoveries                 114 91 88
Provision for loan losses                 1,439 1,483 662
Allowances for loan losses, Ending Balance 1,333       1,699       1,333 1,699 1,404
Credit Cards [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowances for loan losses, Beginning Balance       83       71 83 71 96
Charge-offs                 (97) (78) (39)
Recoveries                 16 18 10
Provision for loan losses                 64 72 4
Allowances for loan losses, Ending Balance 66       83       66 83 71
Overdrafts [Member]
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowances for loan losses, Beginning Balance       175       168 175 168 219
Charge-offs                 (258) (257) (222)
Recoveries                 94 99 94
Provision for loan losses                 196 165 77
Allowances for loan losses, Ending Balance $ 207       $ 175       $ 207 $ 175 $ 168