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Allowance for Probable Loan Losses (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Loan loss allowances, financing receivable past due      
Non-accrual loans, total $ 71,768 $ 118,505 $ 108,030
Reduced interest income on non-accrual loans 2,549 4,114 3,750
Accruing loans contractually past due 90 days or more as to principal or interest payments 15,033 14,288 19,848
Commercial
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 31,929 26,819  
Accruing loans contractually past due 90 days or more as to principal or interest payments 2,689 1,490  
Commercial real estate: other construction and land development
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 26,410 54,336  
Accruing loans contractually past due 90 days or more as to principal or interest payments 497 979  
Commercial real estate: farmland and commercial
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 11,681 34,910  
Accruing loans contractually past due 90 days or more as to principal or interest payments 929 1,231  
Commercial real estate: multifamily
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 353 411  
Residential: first lien
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 1,175 1,848  
Accruing loans contractually past due 90 days or more as to principal or interest payments 9,657 9,382  
Residential: junior lien
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 175 135  
Accruing loans contractually past due 90 days or more as to principal or interest payments 115 320  
Consumer
      
Loan loss allowances, financing receivable past due      
Non-accrual loans, total 45 46  
Accruing loans contractually past due 90 days or more as to principal or interest payments 882 866  
Foreign
      
Loan loss allowances, financing receivable past due      
Accruing loans contractually past due 90 days or more as to principal or interest payments $ 264 $ 20