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Covered Loan Portfolio, by Loan Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | $ 56,994 | $ 83,035
Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 14,369 | 25,529
Commercial Loans | Construction Development And Other Land |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 4,570 | 6,303
Commercial Loans | Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 895 | 1,170
Commercial Loans | Multi-family Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 8 | 640
Commercial Loans | Single-family Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 962 | 2,674
Commercial Loans | Non-farm Non-residential Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 7,512 | 14,065
Commercial Loans | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 25 | 34
Commercial Loans | Farmland Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 397 | 643
Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 42,546 | 57,422
Consumer Real Estate | Home Equity Lines |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 35,817 | 48,565
Consumer Real Estate | Single Family Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | 6,729 | 8,595
Consumer Real Estate | Owner Occupied Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements |  | 262
Consumer and Other Loans | Consumer Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Covered under loss share agreements | $ 79 | $ 84

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