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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (1) (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Loan and Lease Receivables, Impaired [Abstract]      
Unpaid Principal Balance $ 115,538,000   $ 146,602,000
Total LHFI With No Related Allowance Recorded 14,389,000   36,945,000
Total LHFI With An Allowance Recorded 66,269,000   73,513,000
Total Carrying Amount 80,658,000   110,458,000
Related Allowance 13,651,000   12,664,000
Average Recorded Investment 95,559,000   126,689,000
Maximum Concentration Of Loan as a Percentage of Total LHFI (in hundredths) 10.00%    
Carrying amounts of nonaccrual LHFI considered for impairment analysis 80,700,000   110,500,000
Nonaccrual Financing Receivable, Specifically Evaluated For Impairment 36,500,000   68,900,000
Nonaccrual Financing Receivable, Allowance for Credit Losses, Specifically Evaluated For Impairment 6,600,000   8,800,000
Nonaccrual Financing Receivable, Allowance For Credit Losses, Charge-offs, Specifically Evaluated For Impairment 11,000,000 18,400,000  
Nonaccrual Financing Receivable Specifically Evaluated For Impairment Recoveries 0 6,200,000  
Classified as Troubled Debt Restructuring - LHFI 26,300,000   34,200,000
Minimum loan amount for loan to be individually assessed for impairment 500,000    
Nonaccrual Financing Receivable, Not Specifically Evaluated for Impairment 44,200,000   41,600,000
Nonaccrual Financing Receivable, Allowance for Credit Losses, Not Specifically Evaluated for Impairment 7,100,000   3,900,000
Financing Receivable, Related Allowance 4,600,000   4,500,000
Financing Receivable, Related Charge-offs 5,300,000 1,600,000  
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member]
      
Loan and Lease Receivables, Impaired [Abstract]      
Unpaid Principal Balance 45,951,000   58,757,000
Total LHFI With No Related Allowance Recorded 7,815,000   11,123,000
Total LHFI With An Allowance Recorded 18,262,000   29,290,000
Total Carrying Amount 26,077,000   40,413,000
Related Allowance 4,829,000   6,547,000
Average Recorded Investment 33,245,000   49,122,000
Real Estate Secured Financing Receivable [Member] | Secured by 1-4 Family Residential Properties[Member]
      
Loan and Lease Receivables, Impaired [Abstract]      
Unpaid Principal Balance 31,206,000   33,746,000
Total LHFI With No Related Allowance Recorded 2,093,000   1,560,000
Total LHFI With An Allowance Recorded 22,167,000   22,788,000
Total Carrying Amount 24,260,000   24,348,000
Related Allowance 1,373,000   1,348,000
Average Recorded Investment 24,304,000   27,330,000
Real Estate Secured Financing Receivable [Member] | Secured by NonFarm, Nonresidential Properties [Member]
      
Loan and Lease Receivables, Impaired [Abstract]      
Unpaid Principal Balance 24,003,000   27,183,000
Total LHFI With No Related Allowance Recorded 4,424,000   13,770,000
Total LHFI With An Allowance Recorded 14,449,000   10,211,000
Total Carrying Amount 18,873,000   23,981,000
Related Allowance 3,259,000   2,431,000
Average Recorded Investment 21,427,000   26,497,000
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member]
      
Loan and Lease Receivables, Impaired [Abstract]      
Unpaid Principal Balance 5,965,000   7,158,000
Total LHFI With No Related Allowance Recorded 0   1,548,000
Total LHFI With An Allowance Recorded 3,900,000   4,323,000
Total Carrying Amount 3,900,000   5,871,000
Related Allowance 855,000   1,007,000
Average Recorded Investment 4,886,000   6,013,000
Commercial And Industrial Loans Financing Receivable [Member]
      
Loan and Lease Receivables, Impaired [Abstract]      
Unpaid Principal Balance 6,791,000   16,102,000
Total LHFI With No Related Allowance Recorded 57,000   8,724,000
Total LHFI With An Allowance Recorded 6,158,000   5,424,000
Total Carrying Amount 6,215,000   14,148,000
Related Allowance 2,995,000   1,137,000
Average Recorded Investment 10,182,000   15,127,000
Consumer Loans Financing Receivable [Member]
      
Loan and Lease Receivables, Impaired [Abstract]      
Unpaid Principal Balance 670,000   1,097,000
Total LHFI With No Related Allowance Recorded 0   0
Total LHFI With An Allowance Recorded 411,000   825,000
Total Carrying Amount 411,000   825,000
Related Allowance 4,000   9,000
Average Recorded Investment 618,000   1,468,000
Other Loans [Member]
      
Loan and Lease Receivables, Impaired [Abstract]      
Unpaid Principal Balance 952,000   2,559,000
Total LHFI With No Related Allowance Recorded 0   220,000
Total LHFI With An Allowance Recorded 922,000   652,000
Total Carrying Amount 922,000   872,000
Related Allowance 336,000   185,000
Average Recorded Investment $ 897,000   $ 1,132,000