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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, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 10,426 | $ 12,262
Loans Past Due Over 90 Days Still Accruing | 24 | 28
Non-Performing TDRs | 1,466 | 3,172
Performing TDRs | 1,256 | 1,218
Total Non-Performing Loans | 13,172 | 16,680
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 4,026 | 5,030
Non-Performing TDRs | 243 | 1,915
Performing TDRs | 60 | 60
Total Non-Performing Loans | 4,329 | 7,005
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,054 | 1,749
Total Non-Performing Loans | 1,054 | 1,749
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,901 | 3,034
Non-Performing TDRs | 243 | 1,915
Performing TDRs | 60 | 60
Total Non-Performing Loans | 3,204 | 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 | 71 | 176
Total Non-Performing Loans | 71 | 176
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,664 | 4,354
Loans Past Due Over 90 Days Still Accruing | 1 | 1
Non-Performing TDRs | 1,045 | 1,074
Performing TDRs | 950 | 808
Total Non-Performing Loans | 5,660 | 6,237
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,664 | 4,354
Loans Past Due Over 90 Days Still Accruing | 1 | 1
Non-Performing TDRs | 803 | 824
Performing TDRs | 950 | 808
Total Non-Performing Loans | 5,418 | 5,987
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Performing TDRs | 242 | 250
Total Non-Performing Loans | 242 | 250
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,736 | 2,878
Loans Past Due Over 90 Days Still Accruing | 23 | 27
Non-Performing TDRs | 178 | 183
Performing TDRs | 246 | 350
Total Non-Performing Loans | 3,183 | 3,438
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 345 | 541
Total Non-Performing Loans | 345 | 541
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 837 | 601
Loans Past Due Over 90 Days Still Accruing | 23 | 27
Total Non-Performing Loans | 860 | 628
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,554 | 1,736
Non-Performing TDRs | 178 | 183
Performing TDRs | 246 | 350
Total Non-Performing Loans | $ 1,978 | $ 2,269

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