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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, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 12,262 | $ 15,312
Loans Past Due Over 90 Days Still Accruing | 28 | 115
Non-Performing TDRs | 3,172 | 2,643
Performing TDRs | 1,218 | 4,372
Total Non-Performing Loans | 16,680 | 22,442
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 5,030 | 10,024
Non-Performing TDRs | 1,915 | 1,221
Performing TDRs | 60 | 610
Total Non-Performing Loans | 7,005 | 11,855
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,749 | 1,773
Performing TDRs |  | 44
Total Non-Performing Loans | 1,749 | 1,817
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,034 | 7,439
Non-Performing TDRs | 1,915 | 217
Performing TDRs | 60 | 566
Total Non-Performing Loans | 5,009 | 8,222
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 | 176 | 812
Non-Performing TDRs |  | 1,004
Total Non-Performing Loans | 176 | 1,816
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 4,354 | 2,297
Loans Past Due Over 90 Days Still Accruing | 1 | 40
Non-Performing TDRs | 1,074 | 1,031
Performing TDRs | 808 | 2,526
Total Non-Performing Loans | 6,237 | 5,894
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 4,354 | 2,297
Loans Past Due Over 90 Days Still Accruing | 1 | 40
Non-Performing TDRs | 824 | 765
Performing TDRs | 808 | 2,526
Total Non-Performing Loans | 5,987 | 5,628
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Performing TDRs | 250 | 266
Total Non-Performing Loans | 250 | 266
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,878 | 2,991
Loans Past Due Over 90 Days Still Accruing | 27 | 75
Non-Performing TDRs | 183 | 391
Performing TDRs | 350 | 1,236
Total Non-Performing Loans | 3,438 | 4,693
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 541 | 227
Loans Past Due Over 90 Days Still Accruing |  | 10
Total Non-Performing Loans | 541 | 237
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 601 | 557
Loans Past Due Over 90 Days Still Accruing | 27 | 47
Total Non-Performing Loans | 628 | 604
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,736 | 2,207
Loans Past Due Over 90 Days Still Accruing |  | 18
Non-Performing TDRs | 183 | 391
Performing TDRs | 350 | 1,236
Total Non-Performing Loans | $ 2,269 | $ 3,852

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