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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of the period $ 16,421 $ 15,660 $ 16,501 $ 15,992
Total loans charged-off 726 1,541 3,827 3,133
Total loan recoveries 173 300 674 1,221
Net loans charged-off (recovered) 553 1,241 3,153 1,912
Total provision charged to operating expense 300 1,741 2,820 2,080
Balance at the end of the period 16,168 16,160 16,168 16,160
Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 94 1,093 1,785 1,415
Total loan recoveries 17 87 136 585
Total provision charged to operating expense 532 1,563 2,580 1,682
Commercial [Member] | Commercial and Industrial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 38 1,093 291 1,220
Total loan recoveries 8 18 41 435
Commercial [Member] | Owner Occupied Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 56   1,478  
Total loan recoveries 8 4 94 10
Commercial [Member] | Non Owner Occupied Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off     16 22
Total loan recoveries 1 10 1 85
Commercial [Member] | Development & Spec Land Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off       173
Total loan recoveries   55   55
Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 101 31 287 225
Total loan recoveries 5 12 10 19
Total provision charged to operating expense (955) 697 (51) (290)
Real Estate [Member] | Residential Mortgage [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 101 31 287 225
Total loan recoveries 5 12 10 19
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 531 417 1,755 1,493
Total loan recoveries 151 201 528 617
Total provision charged to operating expense 723 (519) 291 688
Consumer [Member] | Direct Installment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 51 74 206 151
Total loan recoveries 15 10 91 49
Consumer [Member] | Indirect Installment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 218 306 783 874
Total loan recoveries 112 165 347 431
Consumer [Member] | Home Equity [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans charged-off 262 37 766 468
Total loan recoveries $ 24 $ 26 $ 90 $ 137