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Summary of Loans, Net of Unearned Income (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income $ 1,626,707 $ 1,559,039
Covered under loss share agreements 132,717 151,682
Total Loans held for investment, net of unearned income 1,759,424 1,710,721
Loans held for sale 459 883
Loans held for investment, net of unearned income, percentage 92.46% 91.13%
Covered loan percentage 7.54% 8.87%
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 901,779 847,315
Loans held for investment, net of unearned income, percentage 51.25% 49.53%
Commercial Loans | Construction Development And Other Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 44,653 35,255
Covered under loss share agreements 15,043 15,865
Loans held for investment, net of unearned income, percentage 2.54% 2.06%
Commercial Loans | Commercial and Industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 94,359 95,455
Covered under loss share agreements 2,855 3,325
Loans held for investment, net of unearned income, percentage 5.36% 5.58%
Commercial Loans | Multi-family Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 88,456 70,197
Covered under loss share agreements 1,662 1,933
Loans held for investment, net of unearned income, percentage 5.02% 4.10%
Commercial Loans | Single-family Non-owner Occupied
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 141,376 135,559
Covered under loss share agreements 6,443 7,449
Loans held for investment, net of unearned income, percentage 8.04% 7.92%
Commercial Loans | Non-farm Non-residential Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 498,096 475,911
Covered under loss share agreements 27,478 34,646
Loans held for investment, net of unearned income, percentage 28.31% 27.82%
Commercial Loans | Agricultural
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 2,443 2,324
Covered under loss share agreements 153 164
Loans held for investment, net of unearned income, percentage 0.14% 0.14%
Commercial Loans | Farmland Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 32,396 32,614
Covered under loss share agreements 803 873
Loans held for investment, net of unearned income, percentage 1.84% 1.91%
Consumer Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 643,459 636,485
Loans held for investment, net of unearned income, percentage 36.58% 37.20%
Consumer Real Estate | Home Equity Lines
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 112,621 111,770
Covered under loss share agreements 64,260 69,206
Loans held for investment, net of unearned income, percentage 6.40% 6.53%
Consumer Real Estate | Single Family Owner Occupied
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 490,626 496,012
Covered under loss share agreements 13,534 16,919
Loans held for investment, net of unearned income, percentage 27.89% 28.99%
Consumer Real Estate | Owner occupied construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 40,212 28,703
Covered under loss share agreements 385 1,184
Loans held for investment, net of unearned income, percentage 2.29% 1.68%
Consumer and Other Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 81,469 75,239
Loans held for investment, net of unearned income, percentage 4.63% 4.40%
Consumer and Other Loans | Consumer Loan
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income 74,100 71,313
Covered under loss share agreements 101 118
Loans held for investment, net of unearned income, percentage 4.21% 4.17%
Consumer and Other Loans | Other Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment, net of unearned income $ 7,369 $ 3,926
Loans held for investment, net of unearned income, percentage 0.42% 0.23%