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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, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 7,936 $ 12,262
Loans Past Due Over 90 Days Still Accruing 241 28
Non-Performing TDRs 1,014 3,172
Performing TDRs 1,492 1,218
Total Non-Performing Loans 10,683 16,680
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,249 5,030
Loans Past Due Over 90 Days Still Accruing 183  
Non-Performing TDRs   1,915
Performing TDRs   60
Total Non-Performing Loans 2,432 7,005
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,532 1,749
Loans Past Due Over 90 Days Still Accruing 183  
Total Non-Performing Loans 1,715 1,749
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 440 3,034
Non-Performing TDRs   1,915
Performing TDRs   60
Total Non-Performing Loans 440 5,009
Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 118 71
Total Non-Performing Loans 118 71
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 159 176
Total Non-Performing Loans 159 176
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,959 4,354
Loans Past Due Over 90 Days Still Accruing   1
Non-Performing TDRs 809 1,074
Performing TDRs 1,254 808
Total Non-Performing Loans 5,022 6,237
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,959 4,354
Loans Past Due Over 90 Days Still Accruing   1
Non-Performing TDRs 576 824
Performing TDRs 1,254 808
Total Non-Performing Loans 4,789 5,987
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-Performing TDRs 233 250
Total Non-Performing Loans 233 250
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,728 2,878
Loans Past Due Over 90 Days Still Accruing 58 27
Non-Performing TDRs 205 183
Performing TDRs 238 350
Total Non-Performing Loans 3,229 3,438
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 512 541
Total Non-Performing Loans 512 541
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 659 601
Loans Past Due Over 90 Days Still Accruing 49 27
Total Non-Performing Loans 708 628
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,557 1,736
Loans Past Due Over 90 Days Still Accruing 9  
Non-Performing TDRs 205 183
Performing TDRs 238 350
Total Non-Performing Loans $ 2,009 $ 2,269