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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of the period   $ 16,421 $ 14,534 $ 16,501
Total loans charged-off $ 406 726 2,108 3,827
Total loan recoveries 249 173 879 674
Net loans charged-off (recovered) 157 553 1,229 3,153
Total provision charged to operating expense 455 300 1,219 2,820
Balance at the end of the period 14,524 16,168 14,524 16,168
Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 11 94 700 1,785
Total loan recoveries 17 17 199 136
Total provision charged to operating expense 165 532 (471) 2,580
Commercial [Member] | Owner Occupied Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 4 56 182 1,478
Total loan recoveries 2 8 31 94
Commercial [Member] | Non Owner Occupied Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off (1)   471 16
Total loan recoveries 1 1 55 1
Commercial [Member] | Residential Development [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loan recoveries 2   6  
Commercial [Member] | Commercial and Industrial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 8 38 47 291
Total loan recoveries 12 8 107 41
Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 12 101 127 287
Total loan recoveries 12 5 75 10
Total provision charged to operating expense 102 (955) (147) (51)
Real Estate [Member] | Residential Mortgage [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 12 101 127 287
Total loan recoveries 12 5 75 10
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 383 531 1,281 1,755
Total loan recoveries 220 151 605 528
Total provision charged to operating expense 188 723 1,837 291
Consumer [Member] | Direct Installment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 55 51 159 206
Total loan recoveries 26 15 70 91
Consumer [Member] | Indirect Installment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 296 218 851 783
Total loan recoveries 160 112 400 347
Consumer [Member] | Home Equity Loan [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 32 262 271 766
Total loan recoveries $ 34 $ 24 $ 135 $ 90