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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

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