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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, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 11,417 | $ 13,276
Loans Past Due Over 90 Days Still Accruing | 202 | 167
Non-Performing TDRs | 1,077 | 1,013
Performing TDRs | 1,830 | 1,958
Total Non-Performing Loans | 14,526 | 16,414
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 7,854 | 6,902
Non-Performing TDRs | 501 | 451
Performing TDRs |  | 1
Total Non-Performing Loans | 8,355 | 7,354
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 5,341 | 4,877
Non-Performing TDRs |  | 11
Performing TDRs |  | 1
Total Non-Performing Loans | 5,341 | 4,889
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 527 | 115
Non-Performing TDRs | 501 | 440
Total Non-Performing Loans | 1,028 | 555
Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 71 | 176
Total Non-Performing Loans | 71 | 176
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,915 | 1,734
Total Non-Performing Loans | 1,915 | 1,734
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,702 | 3,693
Loans Past Due Over 90 Days Still Accruing | 142 |
Non-Performing TDRs | 429 | 351
Performing TDRs | 1,481 | 1,672
Total Non-Performing Loans | 3,754 | 5,716
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,702 | 3,693
Loans Past Due Over 90 Days Still Accruing | 142 |
Non-Performing TDRs | 429 | 351
Performing TDRs | 1,481 | 1,450
Total Non-Performing Loans | 3,754 | 5,494
Real Estate [Member] | Residential Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Performing TDRs |  | 222
Total Non-Performing Loans |  | 222
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,861 | 2,681
Loans Past Due Over 90 Days Still Accruing | 60 | 167
Non-Performing TDRs | 147 | 211
Performing TDRs | 349 | 285
Total Non-Performing Loans | 2,417 | 3,344
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 62 | 160
Total Non-Performing Loans | 62 | 160
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 608 | 1,041
Loans Past Due Over 90 Days Still Accruing | 60 | 167
Total Non-Performing Loans | 668 | 1,208
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,191 | 1,480
Non-Performing TDRs | 147 | 211
Performing TDRs | 349 | 285
Total Non-Performing Loans | $ 1,687 | $ 1,976

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