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Allowance for Probable Loan Losses (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Loan loss allowances, financing receivable past due      
Non-accrual loans, total $ 118,505 $ 108,030 $ 68,338
Reduced interest income on non-accrual loans 4,114 3,750 4,011
Accruing loans contractually past due 90 days or more as to principal or interest payments 14,288 19,848 12,089
Commercial
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 26,819 22,614  
Accruing loans contractually past due 90 days or more as to principal or interest payments 1,490 1,029  
Commercial real estate: other construction and land development
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 54,336 77,207  
Accruing loans contractually past due 90 days or more as to principal or interest payments 979 11,507  
Commercial real estate: farmland and commercial
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 34,910 5,486  
Accruing loans contractually past due 90 days or more as to principal or interest payments 1,231 1,585  
Commercial real estate: multifamily
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 411 473  
Residential: first lien
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 1,848 2,015  
Accruing loans contractually past due 90 days or more as to principal or interest payments 9,382 3,472  
Residential: junior lien
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 135 199  
Accruing loans contractually past due 90 days or more as to principal or interest payments 320 277  
Consumer
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 46 29  
Accruing loans contractually past due 90 days or more as to principal or interest payments 866 1,477  
Foreign
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total   7  
Accruing loans contractually past due 90 days or more as to principal or interest payments $ 20 $ 501