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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 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 10,895 | $ 12,262
Loans Past Due Over 90 Days Still Accruing | 1 | 28
Non-Performing TDRs | 2,857 | 3,172
Performing TDRs | 1,231 | 1,218
Total Non-Performing Loans | 14,984 | 16,680
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 4,099 | 5,030
Non-Performing TDRs | 1,615 | 1,915
Performing TDRs | 60 | 60
Total Non-Performing Loans | 5,774 | 7,005
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,089 | 1,749
Total Non-Performing Loans | 1,089 | 1,749
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,934 | 3,034
Non-Performing TDRs | 1,615 | 1,915
Performing TDRs | 60 | 60
Total Non-Performing Loans | 4,609 | 5,009
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual |  | 71
Total Non-Performing Loans |  | 71
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 76 | 176
Total Non-Performing Loans | 76 | 176
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,950 | 4,354
Loans Past Due Over 90 Days Still Accruing | 1 | 1
Non-Performing TDRs | 1,061 | 1,074
Performing TDRs | 962 | 808
Total Non-Performing Loans | 5,974 | 6,237
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,950 | 4,354
Loans Past Due Over 90 Days Still Accruing | 1 | 1
Non-Performing TDRs | 815 | 824
Performing TDRs | 962 | 808
Total Non-Performing Loans | 5,728 | 5,987
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Performing TDRs | 246 | 250
Total Non-Performing Loans | 246 | 250
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,846 | 2,878
Loans Past Due Over 90 Days Still Accruing |  | 27
Non-Performing TDRs | 181 | 183
Performing TDRs | 209 | 350
Total Non-Performing Loans | 3,236 | 3,438
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 496 | 541
Total Non-Performing Loans | 496 | 541
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 739 | 601
Loans Past Due Over 90 Days Still Accruing |  | 27
Total Non-Performing Loans | 739 | 628
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,611 | 1,736
Non-Performing TDRs | 181 | 183
Performing TDRs | 209 | 350
Total Non-Performing Loans | $ 2,001 | $ 2,269

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