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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of the period $ 17,820 $ 16,394
Total loans charged-off 661 716
Total loan recoveries 298 229
Net loans charged-off 363 487
Total provision charged to operating expense 364 567
Balance at the end of the period 17,821 16,474
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 77 13
Total loan recoveries 16 51
Total provision charged to operating expense 1,122 (1,291)
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 1 13
Total loan recoveries   12
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 64  
Total loan recoveries 6 5
Commercial [Member] | Residential Spec Homes [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loan recoveries 2 2
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 12  
Total loan recoveries 8 32
Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off   12
Total loan recoveries 27 6
Total provision charged to operating expense (107) (252)
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off   12
Total loan recoveries 27 6
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 584 691
Total loan recoveries 255 172
Total provision charged to operating expense (651) 2,110
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 28 55
Total loan recoveries 11 11
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 540 505
Total loan recoveries 201 139
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans charged-off 16 131
Total loan recoveries $ 43 $ 22