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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Balance at beginning of the period       $ 14,534       $ 16,501 $ 14,534 $ 16,501 $ 15,992
Total loans charged-off                 2,660 6,099 4,129
Total loan recoveries                 1,121 970 1,580
Net loans charged-off (recovered)                 1,539 5,129 2,549
Total provision charged to operating expense $ 623 $ 455 $ 232 $ 532 $ 342 $ 300 $ 1,906 $ 614 1,842 3,162 3,058
Balance at the end of the period $ 14,837       $ 14,534       14,837 14,534 16,501
Commercial [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 758 3,437 1,802
Total loan recoveries                 210 192 773
Total provision charged to operating expense                 (68) 2,531 2,277
Commercial [Member] | Owner Occupied Real Estate [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 181 2,208 40
Total loan recoveries                 31 104 13
Commercial [Member] | Non Owner Occupied Real Estate [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 471 556 136
Total loan recoveries                 55 1 210
Commercial [Member] | Residential Development [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loan recoveries                 8    
Commercial [Member] | Development & Spec Land Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                     173
Total loan recoveries                   35 55
Commercial [Member] | Commercial and Industrial [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 106 673 1,453
Total loan recoveries                 116 52 495
Real Estate [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 213 288 328
Total loan recoveries                 97 69 21
Total provision charged to operating expense                 (23) 62 (1,153)
Real Estate [Member] | Residential Mortgage [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 213 288 328
Total loan recoveries                 97 69 21
Consumer [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 1,689 2,374 1,999
Total loan recoveries                 814 709 786
Total provision charged to operating expense                 1,933 569 1,934
Consumer [Member] | Direct Installment [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 329 367 250
Total loan recoveries                 81 106 67
Consumer [Member] | Indirect Installment [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 1,051 1,081 1,233
Total loan recoveries                 529 489 560
Consumer [Member] | Home Equity Loan [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 309 926 516
Total loan recoveries                 $ 204 $ 114 $ 159