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Summary of Loans, Net of Unearned Income (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements $ 195,060 $ 207,106
Loans held for investment, net of unearned income 1,494,232 1,517,547
Total Loans held for investment, net of unearned income 1,689,292 1,724,653
Loans held for sale 2,794 6,672
Covered loan percentage 11.55% 12.01%
Loans held for investment, net of unearned income, percentage 88.45% 87.99%
Loans and leases receivable net reported amount covered and not covered percentage 100.00% 100.00%
Commercial Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 823,422 832,867
Loans held for investment, net of unearned income, percentage 48.74% 48.29%
Commercial Loans | Construction Development And Other Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 24,495 26,595
Loans held for investment, net of unearned income 55,220 57,434
Loans held for investment, net of unearned income, percentage 3.27% 3.33%
Commercial Loans | Commercial and Industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 5,205 6,948
Loans held for investment, net of unearned income 91,666 88,738
Loans held for investment, net of unearned income, percentage 5.43% 5.15%
Commercial Loans | Multi-family Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 2,549 2,611
Loans held for investment, net of unearned income 63,929 65,694
Loans held for investment, net of unearned income, percentage 3.78% 3.81%
Commercial Loans | Single-family Non-owner Occupied
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 10,672 11,428
Loans held for investment, net of unearned income 136,334 135,912
Loans held for investment, net of unearned income, percentage 8.07% 7.88%
Commercial Loans | Non-farm Non-residential Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 42,857 48,565
Loans held for investment, net of unearned income 440,226 448,810
Loans held for investment, net of unearned income, percentage 26.06% 26.02%
Commercial Loans | Agricultural
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 128 144
Loans held for investment, net of unearned income 2,117 1,709
Loans held for investment, net of unearned income, percentage 0.12% 0.10%
Commercial Loans | Farmland Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 1,222 1,091
Loans held for investment, net of unearned income 33,930 34,570
Loans held for investment, net of unearned income, percentage 2.01% 2.00%
Consumer Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 598,582 600,851
Loans held for investment, net of unearned income, percentage 35.44% 34.84%
Consumer Real Estate | Home Equity Lines
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 80,463 81,445
Loans held for investment, net of unearned income 108,385 111,081
Loans held for investment, net of unearned income, percentage 6.42% 6.44%
Consumer Real Estate | Single Family Owner Occupied
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 23,042 22,961
Loans held for investment, net of unearned income 470,437 473,547
Loans held for investment, net of unearned income, percentage 27.85% 27.46%
Consumer Real Estate | Owner Occupied Construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 1,628 1,644
Loans held for investment, net of unearned income 19,760 16,223
Loans held for investment, net of unearned income, percentage 1.17% 0.94%
Consumer and Other Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 72,228 83,829
Loans held for investment, net of unearned income, percentage 4.27% 4.86%
Consumer and Other Loans | Consumer Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 2,799 3,674
Loans held for investment, net of unearned income 68,625 78,163
Loans held for investment, net of unearned income, percentage 4.06% 4.53%
Consumer and Other Loans | Other Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income $ 3,603 $ 5,666
Loans held for investment, net of unearned income, percentage 0.21% 0.33%