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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, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 11,417 $ 13,276
Loans Past Due Over 90 Days Still Accruing 202 167
Non-Performing TDRs 1,077 1,013
Performing TDRs 1,830 1,958
Total Non-Performing Loans 14,526 16,414
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 7,854 6,902
Non-Performing TDRs 501 451
Performing TDRs   1
Total Non-Performing Loans 8,355 7,354
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 5,341 4,877
Non-Performing TDRs   11
Performing TDRs   1
Total Non-Performing Loans 5,341 4,889
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 527 115
Non-Performing TDRs 501 440
Total Non-Performing Loans 1,028 555
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 71 176
Total Non-Performing Loans 71 176
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,915 1,734
Total Non-Performing Loans 1,915 1,734
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,702 3,693
Loans Past Due Over 90 Days Still Accruing 142  
Non-Performing TDRs 429 351
Performing TDRs 1,481 1,672
Total Non-Performing Loans 3,754 5,716
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,702 3,693
Loans Past Due Over 90 Days Still Accruing 142  
Non-Performing TDRs 429 351
Performing TDRs 1,481 1,450
Total Non-Performing Loans 3,754 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 1,861 2,681
Loans Past Due Over 90 Days Still Accruing 60 167
Non-Performing TDRs 147 211
Performing TDRs 349 285
Total Non-Performing Loans 2,417 3,344
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 62 160
Total Non-Performing Loans 62 160
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 608 1,041
Loans Past Due Over 90 Days Still Accruing 60 167
Total Non-Performing Loans 668 1,208
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,191 1,480
Non-Performing TDRs 147 211
Performing TDRs 349 285
Total Non-Performing Loans $ 1,687 $ 1,976