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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, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 11,548 | $ 13,276
Loans Past Due Over 90 Days Still Accruing | 568 | 167
Non-Performing TDRs | 1,057 | 1,013
Performing TDRs | 2,002 | 1,958
Total Non-Performing Loans | 15,175 | 16,414
Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 6,094 | 6,902
Loans Past Due Over 90 Days Still Accruing | 208 |
Non-Performing TDRs | 492 | 451
Performing TDRs | 109 | 1
Total Non-Performing Loans | 6,903 | 7,354
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 3,413 | 4,877
Non-Performing TDRs |  | 11
Performing TDRs | 109 | 1
Total Non-Performing Loans | 3,522 | 4,889
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 554 | 115
Non-Performing TDRs | 492 | 440
Total Non-Performing Loans | 1,046 | 555
Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 68 | 176
Total Non-Performing Loans | 68 | 176
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,059 | 1,734
Loans Past Due Over 90 Days Still Accruing | 208 |
Total Non-Performing Loans | 2,267 | 1,734
Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,846 | 3,693
Loans Past Due Over 90 Days Still Accruing | 180 |
Non-Performing TDRs | 423 | 351
Performing TDRs | 1,558 | 1,672
Total Non-Performing Loans | 5,007 | 5,716
Real Estate [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 2,846 | 3,693
Loans Past Due Over 90 Days Still Accruing | 180 |
Non-Performing TDRs | 423 | 351
Performing TDRs | 1,558 | 1,450
Total Non-Performing Loans | 5,007 | 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 | 2,608 | 2,681
Loans Past Due Over 90 Days Still Accruing | 180 | 167
Non-Performing TDRs | 142 | 211
Performing TDRs | 335 | 285
Total Non-Performing Loans | 3,265 | 3,344
Consumer [Member] | Direct Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 35 | 160
Total Non-Performing Loans | 35 | 160
Consumer [Member] | Indirect Installment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 916 | 1,041
Loans Past Due Over 90 Days Still Accruing | 173 | 167
Total Non-Performing Loans | 1,089 | 1,208
Consumer [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,657 | 1,480
Loans Past Due Over 90 Days Still Accruing | 7 |
Non-Performing TDRs | 142 | 211
Performing TDRs | 335 | 285
Total Non-Performing Loans | $ 2,141 | $ 1,976

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