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Summary of Loans, Net of Unearned Income (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Jun. 08, 2012
May 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements $ 219,055      
Loans held for investment, net of unearned income 1,505,598     1,396,067
Total Loans held for investment, net of unearned income 1,724,653 252,850 166,471 1,396,067
Loans held for sale 6,672     5,820
Construction Development And Other Land
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Loans held for investment, net of unearned income   27,004 19,067  
Single-family Non-owner Occupied
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Loans held for investment, net of unearned income   38,535    
Non-farm Non-residential Loan
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Loans held for investment, net of unearned income   70,208 87,592  
Farmland Loan
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Loans held for investment, net of unearned income   2,567    
Home Equity Lines
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Loans held for investment, net of unearned income   89,520 7,973  
Single Family Owner Occupied
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Loans held for investment, net of unearned income     23,845  
Consumer Loan
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Loans held for investment, net of unearned income   10,461 2,730  
Commercial Loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment, net of unearned income 821,514     712,040
Commercial Loans | Construction Development And Other Land
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 34,569      
Loans held for investment, net of unearned income 49,460     61,768
Commercial Loans | Commercial and Industrial
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 6,972      
Loans held for investment, net of unearned income 88,714     91,939
Commercial Loans | Multi-family Residential
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 2,611      
Loans held for investment, net of unearned income 65,694     77,050
Commercial Loans | Single-family Non-owner Occupied
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 11,693      
Loans held for investment, net of unearned income 135,647     106,743
Commercial Loans | Non-farm Non-residential Loan
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 51,486      
Loans held for investment, net of unearned income 445,889     336,005
Commercial Loans | Agricultural
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 144      
Loans held for investment, net of unearned income 1,709     1,374
Commercial Loans | Farmland Loan
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 1,260      
Loans held for investment, net of unearned income 34,401     37,161
Consumer Real Estate
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment, net of unearned income 600,255     604,031
Consumer Real Estate | Home Equity Lines
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 81,445      
Loans held for investment, net of unearned income 111,081     111,387
Consumer Real Estate | Single Family Owner Occupied
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 23,557      
Loans held for investment, net of unearned income 472,951     473,067
Consumer Real Estate | Owner Occupied Construction
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 1,644      
Loans held for investment, net of unearned income 16,223     19,577
Consumer and Other Loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment, net of unearned income 83,829     79,996
Consumer and Other Loans | Consumer Loan
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Covered under loss share agreements 3,674      
Loans held for investment, net of unearned income 78,163     67,129
Consumer and Other Loans | Other Loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for investment, net of unearned income $ 5,666     $ 12,867