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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, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 13,276 $ 7,936
Loans Past Due Over 90 Days Still Accruing 167 241
Non-Performing TDRs 1,013 1,014
Performing TDRs 1,958 1,492
Total Non-Performing Loans 16,414 10,683
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 6,689 2,249
Loans Past Due Over 90 Days Still Accruing   183
Non-Performing TDRs 451  
Performing TDRs 1  
Total Non-Performing Loans 7,141 2,432
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 4,742 1,532
Loans Past Due Over 90 Days Still Accruing   183
Non-Performing TDRs 11  
Performing TDRs 1  
Total Non-Performing Loans 4,754 1,715
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 115 440
Non-Performing TDRs 440  
Total Non-Performing Loans 555 440
Commercial [Member] | Development & Spec Land Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 176 118
Total Non-Performing Loans 176 118
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,656 159
Total Non-Performing Loans 1,656 159
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 3,693 2,959
Non-Performing TDRs 351 809
Performing TDRs 1,672 1,254
Total Non-Performing Loans 5,716 5,022
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 3,693 2,959
Non-Performing TDRs 351 576
Performing TDRs 1,450 1,254
Total Non-Performing Loans 5,494 4,789
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-Performing TDRs   233
Performing TDRs 222  
Total Non-Performing Loans 222 233
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,894 2,728
Loans Past Due Over 90 Days Still Accruing 167 58
Non-Performing TDRs 211 205
Performing TDRs 285 238
Total Non-Performing Loans 3,557 3,229
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 373 512
Total Non-Performing Loans 373 512
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,041 659
Loans Past Due Over 90 Days Still Accruing 167 49
Total Non-Performing Loans 1,208 708
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 1,480 1,557
Loans Past Due Over 90 Days Still Accruing   9
Non-Performing TDRs 211 205
Performing TDRs 285 238
Total Non-Performing Loans $ 1,976 $ 2,009