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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, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 8,811 $ 7,936
Loans Past Due Over 90 Days Still Accruing 160 241
Non-Performing TDRs 668 1,014
Performing TDRs 1,924 1,492
Total Non-Performing Loans 11,563 10,683
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,794 2,249
Loans Past Due Over 90 Days Still Accruing   183
Total Non-Performing Loans 2,794 2,432
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 746 1,532
Loans Past Due Over 90 Days Still Accruing   183
Total Non-Performing Loans 746 1,715
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 467 440
Total Non-Performing Loans 467 440
Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 107 118
Total Non-Performing Loans 107 118
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,474 159
Total Non-Performing Loans 1,474 159
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 3,176 2,959
Non-Performing TDRs 471 809
Performing TDRs 1,638 1,254
Total Non-Performing Loans 5,285 5,022
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 3,176 2,959
Non-Performing TDRs 471 576
Performing TDRs 1,412 1,254
Total Non-Performing Loans 5,059 4,789
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-Performing TDRs   233
Performing TDRs 226  
Total Non-Performing Loans 226 233
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,841 2,728
Loans Past Due Over 90 Days Still Accruing 160 58
Non-Performing TDRs 197 205
Performing TDRs 286 238
Total Non-Performing Loans 3,484 3,229
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 495 512
Total Non-Performing Loans 495 512
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 957 659
Loans Past Due Over 90 Days Still Accruing 73 49
Total Non-Performing Loans 1,030 708
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,389 1,557
Loans Past Due Over 90 Days Still Accruing 87 9
Non-Performing TDRs 197 205
Performing TDRs 286 238
Total Non-Performing Loans $ 1,959 $ 2,009