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Non accrual Loans Presented by Loan Class (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Total | $ 34,635 | $ 28,246
Acquired impaired loans | 8 | 8
Total nonaccrual loans | 34,643 | 28,254
Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 30,068 | 23,923
Acquired impaired loans | 8 | 8
Total nonaccrual loans | 30,076 | 23,931
Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 4,567 | 4,323
Total nonaccrual loans | 4,567 | 4,323
Commercial Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 8,955 | 2,395
Commercial Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 5,423 | 3,947
Commercial Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 445 | 378
Commercial Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 4,629 | 7,092
Commercial Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 6,206 | 6,889
Commercial Loans | Agricultural |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 17 | 2
Commercial Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 177 |
Commercial Loans | Non Covered Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 6,842 | 405
Commercial Loans | Non Covered Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 5,375 | 3,912
Commercial Loans | Non Covered Loans | Multi-family Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 445 | 378
Commercial Loans | Non Covered Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 4,600 | 7,071
Commercial Loans | Non Covered Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 5,644 | 5,938
Commercial Loans | Non Covered Loans | Agricultural |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 17 | 2
Commercial Loans | Non Covered Loans | Farmland Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 177 |
Commercial Loans | Covered Loans | Construction Development And Other Land |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 2,113 | 1,990
Commercial Loans | Covered Loans | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 48 | 35
Commercial Loans | Covered Loans | Single-family Non-owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 29 | 21
Commercial Loans | Covered Loans | Non-farm, Non-residential |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 562 | 951
Consumer Real Estate | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 1,463 | 1,308
Consumer Real Estate | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 7,092 | 6,050
Consumer Real Estate | Owner occupied construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 59 | 59
Consumer Real Estate | Non Covered Loans | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 925 | 872
Consumer Real Estate | Non Covered Loans | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 5,874 | 5,219
Consumer Real Estate | Covered Loans | Home Equity Lines |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 538 | 436
Consumer Real Estate | Covered Loans | Single Family Owner Occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 1,218 | 831
Consumer Real Estate | Covered Loans | Owner occupied construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 59 | 59
Consumer and Other | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total | 169 | 126
Consumer and Other | Non Covered Loans | Consumer Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Total | $ 169 | $ 126

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