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Non-performing Loans and Impaired Loans - Non-accrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 13,823 $ 11,548
Loans Past Due Over 90 Days Still Accruing 34 568
Non-Performing TDRs 1,807 1,057
Performing TDRs 3,491 2,002
Total Non-Performing Loans 19,155 15,175
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 5,617 6,094
Loans Past Due Over 90 Days Still Accruing   208
Non-Performing TDRs 1,014 492
Performing TDRs 1,562 109
Total Non-Performing Loans 8,193 6,903
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 3,320 3,413
Non-Performing TDRs 629  
Performing TDRs 139 109
Total Non-Performing Loans 4,088 3,522
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 168 554
Non-Performing TDRs 385 492
Total Non-Performing Loans 553 1,046
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 140 68
Total Non-Performing Loans 140 68
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,989 2,059
Loans Past Due Over 90 Days Still Accruing   208
Performing TDRs 1,423  
Total Non-Performing Loans 3,412 2,267
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 5,031 2,846
Loans Past Due Over 90 Days Still Accruing 1 180
Non-Performing TDRs 573 423
Performing TDRs 1,607 1,558
Total Non-Performing Loans 7,212 5,007
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 5,031 2,846
Loans Past Due Over 90 Days Still Accruing 1 180
Non-Performing TDRs 573 423
Performing TDRs 1,607 1,558
Total Non-Performing Loans 7,212 5,007
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 3,175 2,608
Loans Past Due Over 90 Days Still Accruing 33 180
Non-Performing TDRs 220 142
Performing TDRs 322 335
Total Non-Performing Loans 3,750 3,265
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 77 35
Total Non-Performing Loans 77 35
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,121 916
Loans Past Due Over 90 Days Still Accruing 33 173
Total Non-Performing Loans 1,154 1,089
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,977 1,657
Loans Past Due Over 90 Days Still Accruing   7
Non-Performing TDRs 220 142
Performing TDRs 322 335
Total Non-Performing Loans $ 2,519 $ 2,141