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Loans - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance $ 17,269 $ 15,988 $ 16,330 $ 16,737
Charge-offs (977) (993) (2,672) (3,401)
Recoveries 157 86 641 329
Provision (benefit) for loan losses 1,400 622 3,550 2,038
Allowance for loan losses, Ending Balance 17,849 15,703 17,849 15,703
Commercial, Industrial, and Agricultural [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 5,563 5,218 5,428 6,035
Charge-offs (20) (86) (50) (519)
Recoveries 36 37 167 84
Provision (benefit) for loan losses (223) (24) (189) (455)
Allowance for loan losses, Ending Balance 5,356 5,145 5,356 5,145
Commercial Mortgages [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 7,641 6,207 6,753 5,605
Charge-offs (22) 0 (22) (20)
Recoveries 3 2 197 7
Provision (benefit) for loan losses 472 27 1,166 644
Allowance for loan losses, Ending Balance 8,094 6,236 8,094 6,236
Residential Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 1,670 2,299 1,653 2,475
Charge-offs (130) (95) (328) (244)
Recoveries 0 10 73 72
Provision (benefit) for loan losses 468 (65) 610 (154)
Allowance for loan losses, Ending Balance 2,008 2,149 2,008 2,149
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 2,068 2,066 2,215 2,371
Charge-offs (703) (709) (1,969) (2,397)
Recoveries 96 20 110 94
Provision (benefit) for loan losses 627 545 1,732 1,854
Allowance for loan losses, Ending Balance 2,088 1,922 2,088 1,922
Credit Cards [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 142 50 93 90
Charge-offs (39) (17) (111) (54)
Recoveries 8 3 23 18
Provision (benefit) for loan losses 0 36 106 18
Allowance for loan losses, Ending Balance 111 72 111 72
Overdrafts [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses, Beginning Balance 185 148 188 161
Charge-offs (63) (86) (192) (167)
Recoveries 14 14 71 54
Provision (benefit) for loan losses 56 103 125 131
Allowance for loan losses, Ending Balance $ 192 $ 179 $ 192 $ 179