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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Balance at beginning of the period       $ 17,820       $ 16,394 $ 17,820 $ 16,394 $ 14,837
Total loans charged-off                 3,268 2,552 2,253
Total loan recoveries                 1,139 1,072 1,340
Net loans charged-off                 2,129 1,480 913
Total provision charged to operating expense $ 340 $ 376 $ 896 $ 364 $ 528 $ 1,176 $ 635 $ 567 1,976 2,906 2,470
Balance at the end of the period $ 17,667       $ 17,820       17,667 17,820 16,394
Commercial [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 863 473 629
Total loan recoveries                 199 176 298
Total provision charged to operating expense                 2,165 1,699 2,164
Commercial [Member] | Owner Occupied Real Estate [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 41 109 12
Total loan recoveries                   55 8
Commercial [Member] | Non Owner Occupied Real Estate [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 64   75
Total loan recoveries                 15 33 32
Commercial [Member] | Residential Spec Homes [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 3    
Total loan recoveries                 5 8 8
Commercial [Member] | Development & Spec Land [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                     1
Commercial [Member] | Commercial and Industrial [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 755 364 541
Total loan recoveries                 179 80 250
Real Estate [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 93 76 89
Total loan recoveries                 46 27 44
Total provision charged to operating expense                 (635) (487) (81)
Real Estate [Member] | Residential Mortgage [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 93 76 89
Total loan recoveries                 46 27 44
Consumer [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 2,312 2,003 1,535
Total loan recoveries                 894 869 998
Total provision charged to operating expense                 446 1,694 387
Consumer [Member] | Direct Installment [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 208 154 137
Total loan recoveries                 97 53 501
Consumer [Member] | Indirect Installment [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 1,785 1,673 1,193
Total loan recoveries                 661 505 497
Consumer [Member] | Home Equity Loan [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Total loans charged-off                 319 176 $ 205
Total loan recoveries                 $ 136 $ 311