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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (6) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Modifications [Line Items]    
Nonaccrual $ 80,658 $ 110,458
Troubled Debt Restructurings [Member]
    
Financing Receivable, Modifications [Line Items]    
Accruing 3,797 1,023
Nonaccrual 22,552 33,164
Total Troubled Debt Restructurings by Type 26,349 34,187
Troubled Debt Restructurings [Member] | Construction Land Development And Other Financing Receivable [Member]
    
Financing Receivable, Modifications [Line Items]    
Accruing 235 241
Nonaccrual 12,493 14,041
Total Troubled Debt Restructurings by Type 12,728 14,282
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties[Member]
    
Financing Receivable, Modifications [Line Items]    
Accruing 3,562 782
Nonaccrual 5,198 3,485
Total Troubled Debt Restructurings by Type 8,760 4,267
Troubled Debt Restructurings [Member] | Secured by NonFarm, Nonresidential Properties [Member]
    
Financing Receivable, Modifications [Line Items]    
Accruing 0 0
Nonaccrual 4,662 4,135
Total Troubled Debt Restructurings by Type 4,662 4,135
Troubled Debt Restructurings [Member] | Other Real Estate Secured Financing Receivable [Member]
    
Financing Receivable, Modifications [Line Items]    
Accruing 0  
Nonaccrual 199  
Total Troubled Debt Restructurings by Type 199  
Troubled Debt Restructurings [Member] | Commercial And Industrial Loans [Member]
    
Financing Receivable, Modifications [Line Items]    
Accruing   0
Nonaccrual   11,503
Total Troubled Debt Restructurings by Type   $ 11,503