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Nonaccrual Loans by Loan Class (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | $ 18,151 | $ 18,494
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 153 | 93
Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 112 | 16
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 67 | 84
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 1,118 | 1,879
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 7,916 | 7,189
Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 144 | 234
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 1,232 | 1,238
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 7,029 | 7,341
Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 346 | 349
Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 34 | 71
Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 16,196 | 17,847
Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 104 | 39
Non Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 96 |
Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 67 | 84
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 1,091 | 1,850
Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 6,450 | 7,150
Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 144 | 234
Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 925 | 825
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 6,939 | 7,245
Non Covered Loans | Consumer Real Estate | Owner Occupied Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 346 | 349
Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 34 | 71
Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 1,955 | 647
Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 49 | 54
Covered Loans | Commercial Loans | Commercial and Industrial Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 16 | 16
Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 27 | 29
Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 1,466 | 39
Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | 307 | 413
Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total nonaccrual loans | $ 90 | $ 96

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