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Nonaccrual Loans by Loan Class (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Total | $ 12,611 | $ 22,506
Purchased impaired loans |  | 8
Total nonaccrual loans | 12,611 | 22,514
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 90 | 1,948
Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 2,378 | 5,433
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 80 |
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 838 | 2,188
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 2,490 | 2,685
Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total |  | 742
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 384 | 997
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 5,968 | 8,122
Consumer Real Estate | Owner occupied construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 341 | 190
Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 42 | 201
Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 11,480 | 19,153
Purchased impaired loans |  | 8
Total nonaccrual loans | 11,480 | 19,161
Non Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total |  | 1,187
Non Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 2,356 | 5,341
Non Covered Loans | Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 80 |
Non Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 761 | 1,966
Non Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 2,338 | 2,685
Non Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total |  | 441
Non Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 180 | 765
Non Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 5,497 | 6,567
Non Covered Loans | Consumer Real Estate | Owner occupied construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 226 |
Non Covered Loans | Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 42 | 201
Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 1,131 | 3,353
Total nonaccrual loans | 1,131 | 3,353
Covered Loans | Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 90 | 761
Covered Loans | Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 22 | 92
Covered Loans | Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 77 | 222
Covered Loans | Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 152 |
Covered Loans | Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total |  | 301
Covered Loans | Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 204 | 232
Covered Loans | Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 471 | 1,555
Covered Loans | Consumer Real Estate | Owner occupied construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total | $ 115 | $ 190

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