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Covered Loans Held for Investment, Net of Unearned Income (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income $ 163,425 $ 207,106
Commercial Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 71,016 97,382
Commercial Loans | Construction Development And Other Land
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 17,979 26,595
Commercial Loans | Commercial and Industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 3,951 6,948
Commercial Loans | Multi-family Residential
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 2,003 2,611
Commercial Loans | Single-family Non-owner Occupied
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 8,142 11,428
Commercial Loans | Non-farm Non-residential Loan
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 37,751 48,565
Commercial Loans | Agricultural
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 176 144
Commercial Loans | Farmland Loan
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 1,014 1,091
Consumer Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 92,283 106,050
Consumer Real Estate | Home Equity Lines
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 71,724 81,445
Consumer Real Estate | Single Family Owner Occupied
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 19,253 22,961
Consumer Real Estate | Owner Occupied Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income 1,306 1,644
Consumer and Other Loans | Consumer Loan
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans held for investment, net of unearned income $ 126 $ 3,674