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Allowance for Probable Loan Losses (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2011
D
Dec. 31, 2010
Dec. 31, 2009
Loan loss allowances, impaired financing receivable      
Recorded Investment     $ 118,274,000
Related Allowance     30,555,000
Average Recorded Investment 142,310,000 130,481,000 149,528,000
Period of charge off for past due unsecured commercial loans (in days) 90    
Loans with Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 87,369,000 51,506,000 106,780,000
Unpaid Principal Balance 87,419,000 51,594,000  
Related Allowance 27,252,000 12,171,000  
Average Recorded Investment 87,951,000 52,193,000  
Interest Recognized 858,000 902,000  
Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 48,936,000 73,694,000 11,494,000
Unpaid Principal Balance 51,423,000 76,236,000  
Average Recorded Investment 54,359,000 78,288,000  
Interest Recognized 399,000 32,000  
Commercial | Loans with Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 24,108,000 23,062,000  
Unpaid Principal Balance 24,108,000 23,071,000  
Related Allowance 14,402,000 8,138,000  
Average Recorded Investment 24,145,000 23,096,000  
Interest Recognized 41,000 42,000  
Commercial | Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 3,495,000 364,000  
Unpaid Principal Balance 3,932,000 980,000  
Average Recorded Investment 3,942,000 993,000  
Interest Recognized 20,000 30,000  
Commercial real estate: other construction and land development | Loans with Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 34,417,000 10,603,000  
Unpaid Principal Balance 34,432,000 10,645,000  
Related Allowance 3,073,000 592,000  
Average Recorded Investment 34,709,000 10,622,000  
Commercial real estate: other construction and land development | Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 26,011,000 66,604,000  
Unpaid Principal Balance 26,112,000 66,755,000  
Average Recorded Investment 27,722,000 68,608,000  
Interest Recognized 128,000 2,000  
Commercial real estate: farmland and commercial | Loans with Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 28,636,000 17,841,000  
Unpaid Principal Balance 28,671,000 17,878,000  
Related Allowance 9,754,000 3,441,000  
Average Recorded Investment 28,883,000 18,475,000  
Interest Recognized 817,000 860,000  
Commercial real estate: farmland and commercial | Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 13,595,000 4,003,000  
Unpaid Principal Balance 15,394,000 5,606,000  
Average Recorded Investment 16,271,000 5,594,000  
Interest Recognized 102,000    
Commercial real estate: multifamily | Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 411,000 473,000  
Unpaid Principal Balance 411,000 473,000  
Average Recorded Investment 439,000 500,000  
Residential: first lien | Loans with Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 208,000    
Unpaid Principal Balance 208,000    
Related Allowance 23,000    
Average Recorded Investment 214,000    
Residential: first lien | Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 2,082,000 2,015,000  
Unpaid Principal Balance 2,220,000 2,143,000  
Average Recorded Investment 2,230,000 2,297,000  
Interest Recognized 27,000    
Residential: junior lien | Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 1,962,000 199,000  
Unpaid Principal Balance 1,970,000 226,000  
Average Recorded Investment 1,980,000 228,000  
Interest Recognized 118,000    
Consumer | Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 1,334,000 29,000  
Unpaid Principal Balance 1,338,000 46,000  
Average Recorded Investment 1,729,000 49,000  
Foreign | Loans with No Related Allowance
      
Loan loss allowances, impaired financing receivable      
Recorded Investment 46,000 7,000  
Unpaid Principal Balance 46,000 7,000  
Average Recorded Investment 46,000 19,000  
Interest Recognized $ 4,000