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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (5) (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
Troubled Debt Restructurings [Member]
        
Troubled Debt Restructurings [Abstract]        
Number of Contracts 40 6 58 35
Pre-Modification Outstanding Recorded Investment $ 3,894 $ 3,732 $ 10,549 $ 30,592
Post-Modification Outstanding Recorded Investment 3,890 3,792 10,556 27,723
Troubled Debt Restructurings [Member] | Construction Land Development And Other Financing Receivable [Member]
        
Troubled Debt Restructurings [Abstract]        
Number of Contracts 0 1 11 14
Pre-Modification Outstanding Recorded Investment 0 1,843 4,078 9,114
Post-Modification Outstanding Recorded Investment 0 1,843 4,078 8,447
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties[Member]
        
Troubled Debt Restructurings [Abstract]        
Number of Contracts 39 5 44 15
Pre-Modification Outstanding Recorded Investment 3,695 1,889 5,062 5,112
Post-Modification Outstanding Recorded Investment 3,691 1,949 5,069 3,549
Troubled Debt Restructurings [Member] | Nonresidential Nonfarm Properties Financing Receivables [Member]
        
Troubled Debt Restructurings [Abstract]        
Number of Contracts     2 4
Pre-Modification Outstanding Recorded Investment     1,210 4,368
Post-Modification Outstanding Recorded Investment     1,210 4,196
Troubled Debt Restructurings [Member] | Other Real Estate Secured Financing Receivable [Member]
        
Troubled Debt Restructurings [Abstract]        
Number of Contracts 1 0 1 0
Pre-Modification Outstanding Recorded Investment 199 0 199 0
Post-Modification Outstanding Recorded Investment 199 0 199 0
Troubled Debt Restructurings [Member] | Commercial And Industrial Loans [Member]
        
Troubled Debt Restructurings [Abstract]        
Number of Contracts     0 2
Pre-Modification Outstanding Recorded Investment     0 11,998
Post-Modification Outstanding Recorded Investment     0 11,531
Troubled Debt Restructurings that Subsequently Defaulted [Member]
        
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]        
Number of Contracts 19 4 19 4
Recorded Investment 6,322 3,173 6,322 3,173
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Construction Land Development And Other Financing Receivable [Member]
        
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]        
Number of Contracts 10 2 10 2
Recorded Investment 3,671 1,688 3,671 1,688
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Secured by 1-4 Family Residential Properties[Member]
        
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]        
Number of Contracts 8 2 8 2
Recorded Investment 1,781 1,485 1,781 1,485
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Nonresidential Nonfarm Properties Financing Receivables [Member]
        
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]        
Number of Contracts 1 0 1 0
Recorded Investment $ 870 $ 0 $ 870 $ 0