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Business Combinations (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 08, 2012
May 31, 2012
Dec. 31, 2011
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income $ 1,541,633 $ 250,631 $ 166,471 $ 1,396,067
Construction, development, and other land [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   26,214 19,067  
Commercial and industrial [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   10,844 20,001  
Multi-family residential [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   3,388 5,263  
Non-farm, non-residential [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   69,109 87,592  
Agricultural [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   323    
Farmland [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   2,567    
Total commercial loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   112,445 131,923  
Home equity lines [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   89,520 7,973  
Single family owner occupied [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   38,205 23,845  
Total consumer real estate loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   127,725 31,818  
Consumer loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   10,461 2,730  
Purchased Performing [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   135,247 133,868  
Purchased Performing [Member] | Construction, development, and other land [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   19,690 9,641  
Purchased Performing [Member] | Commercial and industrial [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   9,027 17,583  
Purchased Performing [Member] | Multi-family residential [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   2,462 2,111  
Purchased Performing [Member] | Non-farm, non-residential [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   45,737 75,399  
Purchased Performing [Member] | Agricultural [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   321    
Purchased Performing [Member] | Farmland [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   1,522    
Purchased Performing [Member] | Total commercial loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   78,759 104,734  
Purchased Performing [Member] | Home equity lines [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   21,439 7,637  
Purchased Performing [Member] | Single family owner occupied [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   25,509 18,767  
Purchased Performing [Member] | Total consumer real estate loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   46,948 26,404  
Purchased Performing [Member] | Consumer loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   9,540 2,730  
Purchased Impaired [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   115,384 32,603  
Purchased Impaired [Member] | Construction, development, and other land [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   6,524 9,426  
Purchased Impaired [Member] | Commercial and industrial [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   1,817 2,418  
Purchased Impaired [Member] | Multi-family residential [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   926 3,152  
Purchased Impaired [Member] | Non-farm, non-residential [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   23,372 12,193  
Purchased Impaired [Member] | Agricultural [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   2    
Purchased Impaired [Member] | Farmland [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   1,045    
Purchased Impaired [Member] | Total commercial loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   33,686 27,189  
Purchased Impaired [Member] | Home equity lines [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   68,081 336  
Purchased Impaired [Member] | Single family owner occupied [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   12,696 5,078  
Purchased Impaired [Member] | Total consumer real estate loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   80,777 5,414  
Purchased Impaired [Member] | Consumer loans [Member]
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans held for investment, net of unearned income   $ 921