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Loans - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance $ 16,546 $ 16,738 $ 16,330 $ 16,737
Charge-offs (764) (1,065) (1,695) (2,408)
Recoveries 353 95 484 243
Provision (benefit) for loan losses 1,134 220 2,150 1,416
Allowance for loan losses, Ending Balance 17,269 15,988 17,269 15,988
Commercial, Industrial, and Agricultural [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 4,785 5,627 5,428 6,035
Charge-offs (29) (162) (30) (433)
Recoveries 119 39 131 47
Provision (benefit) for loan losses 688 (286) 34 (431)
Allowance for loan losses, Ending Balance 5,563 5,218 5,563 5,218
Commercial Mortgages [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 7,357 6,044 6,753 5,605
Charge-offs 0 (20) 0 (20)
Recoveries 192 0 194 5
Provision (benefit) for loan losses 92 183 694 617
Allowance for loan losses, Ending Balance 7,641 6,207 7,641 6,207
Residential Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 2,022 2,574 1,653 2,475
Charge-offs (130) (124) (198) (149)
Recoveries 2 3 73 62
Provision (benefit) for loan losses (224) (154) 142 (89)
Allowance for loan losses, Ending Balance 1,670 2,299 1,670 2,299
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 2,089 2,274 2,215 2,371
Charge-offs (531) (701) (1,266) (1,688)
Recoveries 12 30 14 74
Provision (benefit) for loan losses 498 463 1,105 1,309
Allowance for loan losses, Ending Balance 2,068 2,066 2,068 2,066
Credit Cards [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 105 81 93 90
Charge-offs (14) (28) (72) (37)
Recoveries 4 3 15 15
Provision (benefit) for loan losses 47 (6) 106 (18)
Allowance for loan losses, Ending Balance 142 50 142 50
Overdrafts [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 188 138 188 161
Charge-offs (60) (30) (129) (81)
Recoveries 24 20 57 40
Provision (benefit) for loan losses 33 20 69 28
Allowance for loan losses, Ending Balance $ 185 $ 148 $ 185 $ 148