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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 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 9,065 | $ 7,936
Loans Past Due Over 90 Days Still Accruing | 162 | 241
Non-Performing TDRs | 1,192 | 1,014
Performing TDRs | 2,015 | 1,492
Total Non-Performing Loans | 12,434 | 10,683
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,921 | 2,249
Loans Past Due Over 90 Days Still Accruing |  | 183
Non-Performing TDRs | 512 |
Total Non-Performing Loans | 3,433 | 2,432
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 894 | 1,532
Loans Past Due Over 90 Days Still Accruing |  | 183
Non-Performing TDRs | 29 |
Total Non-Performing Loans | 923 | 1,715
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 218 | 440
Non-Performing TDRs | 483 |
Total Non-Performing Loans | 701 | 440
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 102 | 118
Total Non-Performing Loans | 102 | 118
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,707 | 159
Total Non-Performing Loans | 1,707 | 159
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,269 | 2,959
Loans Past Due Over 90 Days Still Accruing | 119 |
Non-Performing TDRs | 460 | 809
Performing TDRs | 1,697 | 1,254
Total Non-Performing Loans | 5,545 | 5,022
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,269 | 2,959
Loans Past Due Over 90 Days Still Accruing | 119 |
Non-Performing TDRs | 460 | 576
Performing TDRs | 1,473 | 1,254
Total Non-Performing Loans | 5,321 | 4,789
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Performing TDRs |  | 233
Performing TDRs | 224 |
Total Non-Performing Loans | 224 | 233
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,875 | 2,728
Loans Past Due Over 90 Days Still Accruing | 43 | 58
Non-Performing TDRs | 220 | 205
Performing TDRs | 318 | 238
Total Non-Performing Loans | 3,456 | 3,229
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 310 | 512
Total Non-Performing Loans | 310 | 512
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,019 | 659
Loans Past Due Over 90 Days Still Accruing | 15 | 49
Total Non-Performing Loans | 1,034 | 708
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,546 | 1,557
Loans Past Due Over 90 Days Still Accruing | 28 | 9
Non-Performing TDRs | 220 | 205
Performing TDRs | 318 | 238
Total Non-Performing Loans | $ 2,112 | $ 2,009

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