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Summary of Loans, Net of Unearned Income (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements $ 184,076 $ 207,106
Loans held for investment, net of unearned income 1,507,422 1,517,547
Total Loans held for investment, net of unearned income 1,691,498 1,724,653
Loans held for sale 4,621 6,672
Covered loan percentage 10.88% 12.01%
Loans held for investment, net of unearned income, percentage 89.12% 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 830,360 832,867
Loans held for investment, net of unearned income, percentage 49.09% 48.29%
Commercial Loans | Construction Development And Other Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 23,067 26,595
Loans held for investment, net of unearned income 52,198 57,434
Loans held for investment, net of unearned income, percentage 3.09% 3.33%
Commercial Loans | Commercial and Industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 4,412 6,948
Loans held for investment, net of unearned income 92,448 88,738
Loans held for investment, net of unearned income, percentage 5.47% 5.15%
Commercial Loans | Multi-family Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 2,434 2,611
Loans held for investment, net of unearned income 59,536 65,694
Loans held for investment, net of unearned income, percentage 3.52% 3.81%
Commercial Loans | Single-family Non-owner Occupied
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 9,750 11,428
Loans held for investment, net of unearned income 134,207 135,912
Loans held for investment, net of unearned income, percentage 7.93% 7.88%
Commercial Loans | Non-farm Non-residential Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 41,200 48,565
Loans held for investment, net of unearned income 455,224 448,810
Loans held for investment, net of unearned income, percentage 26.91% 26.02%
Commercial Loans | Agricultural
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 31 144
Loans held for investment, net of unearned income 2,393 1,709
Loans held for investment, net of unearned income, percentage 0.14% 0.10%
Commercial Loans | Farmland Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 1,234 1,091
Loans held for investment, net of unearned income 34,354 34,570
Loans held for investment, net of unearned income, percentage 2.03% 2.00%
Consumer Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 604,308 600,851
Loans held for investment, net of unearned income, percentage 35.73% 34.84%
Consumer Real Estate | Home Equity Lines
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 77,132 81,445
Loans held for investment, net of unearned income 109,820 111,081
Loans held for investment, net of unearned income, percentage 6.49% 6.44%
Consumer Real Estate | Single Family Owner Occupied
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 20,467 22,961
Loans held for investment, net of unearned income 473,212 473,547
Loans held for investment, net of unearned income, percentage 27.98% 27.46%
Consumer Real Estate | Owner Occupied Construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 1,638 1,644
Loans held for investment, net of unearned income 21,276 16,223
Loans held for investment, net of unearned income, percentage 1.26% 0.94%
Consumer and Other Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 72,754 83,829
Loans held for investment, net of unearned income, percentage 4.30% 4.86%
Consumer and Other Loans | Consumer Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Covered under loss share agreements 2,711 3,674
Loans held for investment, net of unearned income 69,002 78,163
Loans held for investment, net of unearned income, percentage 4.08% 4.53%
Consumer and Other Loans | Other Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income $ 3,752 $ 5,666
Loans held for investment, net of unearned income, percentage 0.22% 0.33%