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Components of Covered Loan Portfolio, Disaggregated by Class (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | $ 90,203 | $ 122,240
Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 28,900 | 49,340
Commercial Loans | Construction Development And Other Land |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 7,573 | 13,100
Commercial Loans | Commercial and Industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 1,326 | 2,662
Commercial Loans | Multi-family Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 699 | 1,584
Commercial Loans | Single-family Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 2,899 | 5,918
Commercial Loans | Non-farm Non-residential Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 15,712 | 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 | 656 | 716
Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 61,219 | 72,812
Consumer Real Estate | Home Equity Lines |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 51,205 | 60,391
Consumer Real Estate | Single Family Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 9,736 | 11,968
Consumer Real Estate | Owner Occupied Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 278 | 453
Consumer and Other Loans | Consumer Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | $ 84 | $ 88

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