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Components of Covered Loan Portfolio, Disaggregated by Class (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | $ 102,634 | $ 122,240
Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 37,545 | 49,340
Commercial Loans | Construction Development And Other Land |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 9,000 | 13,100
Commercial Loans | Commercial and Industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 1,449 | 2,662
Commercial Loans | Multi-family Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 848 | 1,584
Commercial Loans | Single-family Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 4,138 | 5,918
Commercial Loans | Non-farm Non-residential Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 21,404 | 25,317
Commercial Loans | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 35 | 43
Commercial Loans | Farmland Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 671 | 716
Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 65,004 | 72,812
Consumer Real Estate | Home Equity Lines |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 54,565 | 60,391
Consumer Real Estate | Single Family Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 10,253 | 11,968
Consumer Real Estate | Owner Occupied Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 186 | 453
Consumer and Other Loans | Consumer Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | $ 85 | $ 88

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