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Non-performing Assets 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
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 11,548 $ 13,276
Loans Past Due Over 90 Days Still Accruing 568 167
Non-Performing TDRs 1,057 1,013
Performing TDRs 2,002 1,958
Total Non-Performing Loans 15,175 16,414
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 6,094 6,902
Loans Past Due Over 90 Days Still Accruing 208  
Non-Performing TDRs 492 451
Performing TDRs 109 1
Total Non-Performing Loans 6,903 7,354
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 3,413 4,877
Non-Performing TDRs   11
Performing TDRs 109 1
Total Non-Performing Loans 3,522 4,889
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 554 115
Non-Performing TDRs 492 440
Total Non-Performing Loans 1,046 555
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 68 176
Total Non-Performing Loans 68 176
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,059 1,734
Loans Past Due Over 90 Days Still Accruing 208  
Total Non-Performing Loans 2,267 1,734
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,846 3,693
Loans Past Due Over 90 Days Still Accruing 180  
Non-Performing TDRs 423 351
Performing TDRs 1,558 1,672
Total Non-Performing Loans 5,007 5,716
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,846 3,693
Loans Past Due Over 90 Days Still Accruing 180  
Non-Performing TDRs 423 351
Performing TDRs 1,558 1,450
Total Non-Performing Loans 5,007 5,494
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Performing TDRs   222
Total Non-Performing Loans   222
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,608 2,681
Loans Past Due Over 90 Days Still Accruing 180 167
Non-Performing TDRs 142 211
Performing TDRs 335 285
Total Non-Performing Loans 3,265 3,344
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 35 160
Total Non-Performing Loans 35 160
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 916 1,041
Loans Past Due Over 90 Days Still Accruing 173 167
Total Non-Performing Loans 1,089 1,208
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,657 1,480
Loans Past Due Over 90 Days Still Accruing 7  
Non-Performing TDRs 142 211
Performing TDRs 335 285
Total Non-Performing Loans $ 2,141 $ 1,976