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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (4) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     $ 89,518  
Provision for loan losses, LHFI 3,358 7,978 7,301 23,631
Balance at end of period 83,526   83,526  
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Total 83,526   83,526  
Number of Loan Types For Commercial Portfolio 9   9  
Number of Risk Rate Factors For Commercial Loans 360   360  
Number of Unique Qualitative Factors Used To Analyze Commercial Loans 8   8  
The Minimum Score For Qualitative Risk Factor     0  
The Maximum Score For Qualitative Risk Factor     100  
Allowance for Loan Loses, LHFI [Member]
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     89,518 93,510
Loans charged-off     (22,547) (37,312)
Recoveries     9,254 9,634
Net charge-offs     (13,293) (27,678)
Provision for loan losses, LHFI     7,301 23,631
Balance at end of period 83,526 89,463 83,526 89,463
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually 13,651 8,962 13,651 8,962
Collectively 69,875 80,501 69,875 80,501
Total 83,526 89,463 83,526 89,463
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Allowance for Loan Loses, LHFI [Member]
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     27,220 35,562
Loans charged-off     (2,944) (14,375)
Recoveries     0 0
Provision for loan losses, LHFI     (1,732) 8,353
Balance at end of period 22,544 29,540 22,544 29,540
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually 4,829 4,165 4,829 4,165
Collectively 17,715 25,375 17,715 25,375
Total 22,544 29,540 22,544 29,540
Real Estate Secured Financing Receivable [Member] | Secured by 1-4 Family Residential Properties[Member] | Allowance for Loan Loses, LHFI [Member]
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     12,650 13,051
Loans charged-off     (3,238) (7,461)
Recoveries     364 410
Provision for loan losses, LHFI     2,203 5,538
Balance at end of period 11,979 11,538 11,979 11,538
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually 1,373 540 1,373 540
Collectively 10,606 10,998 10,606 10,998
Total 11,979 11,538 11,979 11,538
Real Estate Secured Financing Receivable [Member] | Secured by NonFarm, Nonresidential Properties [Member] | Allowance for Loan Loses, LHFI [Member]
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     24,358 20,980
Loans charged-off     (5,409) (3,124)
Recoveries     0 0
Provision for loan losses, LHFI     3,823 4,882
Balance at end of period 22,772 22,738 22,772 22,738
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually 3,259 1,510 3,259 1,510
Collectively 19,513 21,228 19,513 21,228
Total 22,772 22,738 22,772 22,738
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member] | Allowance for Loan Loses, LHFI [Member]
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     3,079 1,582
Loans charged-off     (1,602) (577)
Recoveries     0 0
Provision for loan losses, LHFI     733 1,969
Balance at end of period 2,210 2,974 2,210 2,974
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually 855 1,008 855 1,008
Collectively 1,355 1,966 1,355 1,966
Total 2,210 2,974 2,210 2,974
Commercial And Industrial Loans [Member] | Allowance for Loan Loses, LHFI [Member]
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     15,868 14,775
Loans charged-off     (2,985) (3,811)
Recoveries     2,123 2,259
Provision for loan losses, LHFI     3,428 2,529
Balance at end of period 18,434 15,752 18,434 15,752
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually 2,995 1,454 2,995 1,454
Collectively 15,439 14,298 15,439 14,298
Total 18,434 15,752 18,434 15,752
Consumer Loans [Member] | Allowance for Loan Loses, LHFI [Member]
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     3,656 5,400
Loans charged-off     (2,360) (4,410)
Recoveries     4,189 4,475
Provision for loan losses, LHFI     (2,620) (1,474)
Balance at end of period 2,865 3,991 2,865 3,991
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually 4 10 4 10
Collectively 2,861 3,981 2,861 3,981
Total 2,865 3,991 2,865 3,991
Other Loans [Member] | Allowance for Loan Loses, LHFI [Member]
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     2,687 2,160
Loans charged-off     (4,009) (3,554)
Recoveries     2,578 2,490
Provision for loan losses, LHFI     1,466 1,834
Balance at end of period 2,722 2,930 2,722 2,930
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Individually 336 275 336 275
Collectively 2,386 2,655 2,386 2,655
Total $ 2,722 $ 2,930 $ 2,722 $ 2,930