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Carrying Amount of Acquired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Jun. 08, 2012
May 31, 2012
Dec. 31, 2011
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value $ 1,724,653 $ 252,850 $ 166,471 $ 1,396,067
Construction Development And Other Land
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   27,004 19,067  
Commercial and Industrial Loans
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   10,844 20,001  
Multi Family Residential Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   3,388 5,263  
Non-farm Non-residential Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   70,208 87,592  
Commercial Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   114,334 131,923  
Home Equity Lines
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   89,520 7,973  
Single Family Owner Occupied
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value     23,845  
Commercial Real Estate
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   128,055 31,818  
Consumer Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   10,461 2,730  
Agricultural Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   323    
Farmland Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   2,567    
Single-family Non-owner Occupied
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   38,535    
Purchased Performing Loans
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   135,278 133,868  
Purchased Performing Loans | Construction Development And Other Land
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   19,690 9,641  
Purchased Performing Loans | Commercial and Industrial Loans
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   9,027 17,583  
Purchased Performing Loans | Multi Family Residential Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   2,462 2,111  
Purchased Performing Loans | Non-farm Non-residential Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   45,768 75,399  
Purchased Performing Loans | Commercial Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   78,790 104,734  
Purchased Performing Loans | Home Equity Lines
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   21,439 7,637  
Purchased Performing Loans | Single Family Owner Occupied
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value     18,767  
Purchased Performing Loans | Commercial Real Estate
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   46,948 26,404  
Purchased Performing Loans | Consumer Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   9,540 2,730  
Purchased Performing Loans | Agricultural Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   321    
Purchased Performing Loans | Farmland Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   1,522    
Purchased Performing Loans | Single-family Non-owner Occupied
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   25,509    
Purchased Impaired Loans
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   117,572 32,603  
Purchased Impaired Loans | Construction Development And Other Land
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   7,314 9,426  
Purchased Impaired Loans | Commercial and Industrial Loans
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   1,817 2,418  
Purchased Impaired Loans | Multi Family Residential Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   926 3,152  
Purchased Impaired Loans | Non-farm Non-residential Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   24,440 12,193  
Purchased Impaired Loans | Commercial Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   35,544 27,189  
Purchased Impaired Loans | Home Equity Lines
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   68,081 336  
Purchased Impaired Loans | Single Family Owner Occupied
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value     5,078  
Purchased Impaired Loans | Commercial Real Estate
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   81,107 5,414  
Purchased Impaired Loans | Consumer Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   921    
Purchased Impaired Loans | Agricultural Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   2    
Purchased Impaired Loans | Farmland Loan
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   1,045    
Purchased Impaired Loans | Single-family Non-owner Occupied
        
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract]        
Loans acquired at fair value   $ 13,026