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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
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 12,555 $ 13,276
Loans Past Due Over 90 Days Still Accruing 49 167
Non-Performing TDRs 894 1,013
Performing TDRs 1,911 1,958
Total Non-Performing Loans 15,409 16,414
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 8,682 6,902
Non-Performing TDRs 305 451
Performing TDRs   1
Total Non-Performing Loans 8,987 7,354
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 5,629 4,877
Non-Performing TDRs   11
Performing TDRs   1
Total Non-Performing Loans 5,629 4,889
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,038 115
Non-Performing TDRs 305 440
Total Non-Performing Loans 1,343 555
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 72 176
Total Non-Performing Loans 72 176
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,943 1,734
Total Non-Performing Loans 1,943 1,734
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,823 3,693
Loans Past Due Over 90 Days Still Accruing 11  
Non-Performing TDRs 440 351
Performing TDRs 1,641 1,672
Total Non-Performing Loans 3,915 5,716
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,823 3,693
Loans Past Due Over 90 Days Still Accruing 11  
Non-Performing TDRs 440 351
Performing TDRs 1,641 1,450
Total Non-Performing Loans 3,915 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 2,050 2,681
Loans Past Due Over 90 Days Still Accruing 38 167
Non-Performing TDRs 149 211
Performing TDRs 270 285
Total Non-Performing Loans 2,507 3,344
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 54 160
Total Non-Performing Loans 54 160
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 619 1,041
Loans Past Due Over 90 Days Still Accruing 38 167
Total Non-Performing Loans 657 1,208
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,377 1,480
Non-Performing TDRs 149 211
Performing TDRs 270 285
Total Non-Performing Loans $ 1,796 $ 1,976