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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