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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of the period $ 14,534 $ 16,501
Total loans charged-off 1,109 666
Total loan recoveries 279 185
Net loans charged-off (recovered) 830 481
Total provision charged to operating expense 532 614
Balance at the end of the period 14,236 16,634
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 485 16
Total loan recoveries 82 27
Total provision charged to operating expense (332) (45)
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 147  
Total loan recoveries 25 8
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 299 16
Total loan recoveries 23  
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loan recoveries 2  
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 39  
Total loan recoveries 32 19
Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 115 22
Total loan recoveries 32 2
Total provision charged to operating expense (592) 933
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 115 22
Total loan recoveries 32 2
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 509 628
Total loan recoveries 165 156
Total provision charged to operating expense 1,456 (274)
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 58 59
Total loan recoveries 16 29
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 276 369
Total loan recoveries 94 101
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 175 200
Total loan recoveries $ 55 $ 26