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Loans - Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowances for loan losses, Beginning Balance $ 16,234 $ 14,060
Charge-offs (650) (1,169)
Recoveries 71 76
Provision (benefit) for loan losses 1,019 930
Allowances for loan losses, Ending Balance 16,674 13,897
Commercial, Industrial, and Agricultural [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowances for loan losses, Beginning Balance 6,394 4,940
Charge-offs 0 0
Recoveries 0 0
Provision (benefit) for loan losses 734 331
Allowances for loan losses, Ending Balance 7,128 5,271
Commercial Mortgages [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowances for loan losses, Beginning Balance 5,354 4,697
Charge-offs (50) (607)
Recoveries 0 1
Provision (benefit) for loan losses (570) 208
Allowances for loan losses, Ending Balance 4,734 4,299
Residential Real Estate [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowances for loan losses, Beginning Balance 2,880 2,466
Charge-offs (122) (172)
Recoveries 19 1
Provision (benefit) for loan losses (202) 100
Allowances for loan losses, Ending Balance 2,575 2,395
Consumer [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowances for loan losses, Beginning Balance 1,333 1,699
Charge-offs (399) (331)
Recoveries 22 41
Provision (benefit) for loan losses 1,016 298
Allowances for loan losses, Ending Balance 1,972 1,707
Credit Cards [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowances for loan losses, Beginning Balance 66 83
Charge-offs (21) (12)
Recoveries 2 2
Provision (benefit) for loan losses 21 4
Allowances for loan losses, Ending Balance 68 77
Overdrafts [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowances for loan losses, Beginning Balance 207 175
Charge-offs (58) (47)
Recoveries 28 31
Provision (benefit) for loan losses 20 (11)
Allowances for loan losses, Ending Balance $ 197 $ 148