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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (3) (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Aging [Abstract]    
Past Due 30 - 89 Days $ 26,163,000 $ 34,265,000
Past Due Greater Than 90 Days 5,699,000 [1] 4,230,000 [1]
Total Past Due 31,862,000 38,495,000
Nonaccrual 80,658,000 110,458,000
Current Loans 5,415,443,000 5,708,531,000
Total LHFI 5,527,963,000 5,857,484,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due 45,200,000 43,600,000
Covered Serviced Financing Receivable Available for Repurchase, Recorded Investment, Equal to Greater than 90 Days Past Due 39,500,000 39,400,000
Percentage of Outstanding Principal To Be Repurchased Under GNMA Optional Repurchase Program (in hundredths) 100.00%  
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member]
    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Past Due 30 - 89 Days 1,762,000 1,784,000
Past Due Greater Than 90 Days 0 [1] 1,657,000 [1]
Total Past Due 1,762,000 3,441,000
Nonaccrual 26,077,000 40,413,000
Current Loans 432,760,000 430,228,000
Total LHFI 460,599,000 474,082,000
Real Estate Secured Financing Receivable [Member] | Secured by 1-4 Family Residential Properties[Member]
    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Past Due 30 - 89 Days 12,672,000 9,755,000
Past Due Greater Than 90 Days 2,843,000 [1] 1,306,000 [1]
Total Past Due 15,515,000 11,061,000
Nonaccrual 24,260,000 24,348,000
Current Loans 1,471,739,000 1,725,521,000
Total LHFI 1,511,514,000 1,760,930,000
Real Estate Secured Financing Receivable [Member] | Secured by NonFarm, Nonresidential Properties [Member]
    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Past Due 30 - 89 Days 3,364,000 9,925,000
Past Due Greater Than 90 Days 91,000 [1] 0 [1]
Total Past Due 3,455,000 9,925,000
Nonaccrual 18,873,000 23,981,000
Current Loans 1,375,208,000 1,391,868,000
Total LHFI 1,397,536,000 1,425,774,000
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member]
    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Past Due 30 - 89 Days 184,000 879,000
Past Due Greater Than 90 Days 0 [1] 0 [1]
Total Past Due 184,000 879,000
Nonaccrual 3,900,000 5,871,000
Current Loans 180,720,000 198,099,000
Total LHFI 184,804,000 204,849,000
Commercial And Industrial Loans [Member]
    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Past Due 30 - 89 Days 3,861,000 1,646,000
Past Due Greater Than 90 Days 2,532,000 [1] 769,000 [1]
Total Past Due 6,393,000 2,415,000
Nonaccrual 6,215,000 14,148,000
Current Loans 1,151,073,000 1,122,802,000
Total LHFI 1,163,681,000 1,139,365,000
Consumer Loans [Member]
    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Past Due 30 - 89 Days 4,246,000 7,172,000
Past Due Greater Than 90 Days 233,000 [1] 498,000 [1]
Total Past Due 4,479,000 7,670,000
Nonaccrual 411,000 825,000
Current Loans 177,006,000 235,261,000
Total LHFI 181,896,000 243,756,000
Other Loans [Member]
    
Financing Receivable, Recorded Investment, Aging [Abstract]    
Past Due 30 - 89 Days 74,000 3,104,000
Past Due Greater Than 90 Days 0 [1] 0 [1]
Total Past Due 74,000 3,104,000
Nonaccrual 922,000 872,000
Current Loans 626,937,000 604,752,000
Total LHFI $ 627,933,000 $ 608,728,000
[1] Past due greater than 90 days but still accruing interest.