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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of the period $ 14,236 $ 16,634 $ 14,534 $ 16,501
Total loans charged-off 593 2,435 1,702 3,101
Total loan recoveries 351 316 630 501
Net loans charged-off (recovered) 242 2,119 1,072 2,600
Total provision charged to operating expense 232 1,906 764 2,520
Balance at the end of the period 14,226 16,421 14,226 16,421
Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 204 1,675 689 1,691
Total loan recoveries 100 92 182 119
Total provision charged to operating expense (305) 2,093 (639) 2,048
Commercial [Member] | Owner Occupied Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 31 1,422 178 1,422
Total loan recoveries 4 78 29 86
Commercial [Member] | Non Owner Occupied Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 173   472 16
Total loan recoveries 31   54  
Commercial [Member] | Residential Development [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loan recoveries 2   4  
Commercial [Member] | Commercial and Industrial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off   253 39 253
Total loan recoveries 63 14 95 33
Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off   164 115 186
Total loan recoveries 31 3 63 5
Total provision charged to operating expense 343 (29) (249) 904
Real Estate [Member] | Residential Mortgage [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off   164 115 186
Total loan recoveries 31 3 63 5
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 389 596 898 1,224
Total loan recoveries 220 221 385 377
Total provision charged to operating expense 194 (158) 1,652 (432)
Consumer [Member] | Direct Installment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 46 96 104 155
Total loan recoveries 28 47 44 76
Consumer [Member] | Indirect Installment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 279 196 555 565
Total loan recoveries 146 134 240 235
Consumer [Member] | Home Equity Loan [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 64 304 239 504
Total loan recoveries $ 46 $ 40 $ 101 $ 66