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Nonaccrual Loans by Loan Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | $ 18,494 | $ 12,994
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 93 | 18
Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 16 | 157
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 84 | 245
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 1,879 | 678
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 7,189 | 3,651
Commercial Loans | Agricultural |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans |  | 4
Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 234 |
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 1,238 | 996
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 7,341 | 7,071
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 349 | 106
Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 71 | 68
Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 17,847 | 10,556
Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 39 |
Non Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans |  | 123
Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 84 | 245
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 1,850 | 601
Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 7,150 | 2,334
Non Covered Loans | Commercial Loans | Agricultural |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans |  | 4
Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 234 |
Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 825 | 792
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 7,245 | 6,389
Non Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 349 |
Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 71 | 68
Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 647 | 2,438
Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 54 | 18
Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 16 | 34
Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 29 | 77
Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 39 | 1,317
Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 413 | 204
Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | $ 96 | 682
Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans |  | $ 106

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