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Loans Modified as Troubled Debt Restructurings by Loan Class Segregated by Accrual Status (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | $ 14,762 | $ 15,301
Allowance for loan losses related to TDRs |  | 552 | 590
Commercial Loans | Single-family Non-owner Occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 937 | 950
Commercial Loans | Non-farm, Non-residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 4,205 | 4,600
Consumer Real Estate | Home Equity Lines |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 162 | 170
Consumer Real Estate | Single Family Owner Occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 8,876 | 8,989
Consumer Real Estate | Owner Occupied Construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 582 | 592
Nonaccrual |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs | [1] | 1,311 | 1,339
Nonaccrual | Commercial Loans | Single-family Non-owner Occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs | [1] | 39 | 130
Nonaccrual | Consumer Real Estate | Home Equity Lines |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs | [1] |  | 127
Nonaccrual | Consumer Real Estate | Single Family Owner Occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs | [1] | 929 | 733
Nonaccrual | Consumer Real Estate | Owner Occupied Construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs | [1] | 343 | 349
Accrual |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 13,451 | 13,962
Accrual | Commercial Loans | Single-family Non-owner Occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 898 | 820
Accrual | Commercial Loans | Non-farm, Non-residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 4,205 | 4,600
Accrual | Consumer Real Estate | Home Equity Lines |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 162 | 43
Accrual | Consumer Real Estate | Single Family Owner Occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | 7,947 | 8,256
Accrual | Consumer Real Estate | Owner Occupied Construction |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total TDRs |  | $ 239 | $ 243
[1] | Nonaccrual TDRs are included in total nonaccrual loans disclosed in the nonaccrual table above.

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