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Allowance for Probable Loan Losses (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Interest income recognized:    
Period of charge off for past due unsecured commercial loans 90 days  
Class of financing receivable
    
Recorded investment:    
Total impaired loans with related allowance $ 11,982 $ 87,369
Total impaired loans with no related allowance 71,023 48,936
Unpaid principal balance:    
Total impaired loans with an allowance recorded 15,273 87,419
Total impaired loans with no related allowance recorded 73,728 49,551
Related Allowance 4,746 27,252
Average recorded investment:    
Total impaired loans with an allowance recorded 35,076 79,852
Total impaired loans with no related allowance recorded 65,536 40,966
Interest income recognized:    
Total impaired loans with an allowance recorded 131 858
Total impaired loans with no related allowance recorded 323 372
Commercial | Class of financing receivable
    
Recorded investment:    
Total impaired loans with related allowance 1,633 24,108
Total impaired loans with no related allowance 31,135 3,495
Unpaid principal balance:    
Total impaired loans with an allowance recorded 1,679 24,108
Total impaired loans with no related allowance recorded 31,170 3,500
Related Allowance 1,477 14,402
Average recorded investment:    
Total impaired loans with an allowance recorded 21,126 23,101
Total impaired loans with no related allowance recorded 2,996 685
Interest income recognized:    
Total impaired loans with an allowance recorded 39 41
Total impaired loans with no related allowance recorded 4  
Commercial real estate: other construction and land development | Class of financing receivable
    
Recorded investment:    
Total impaired loans with related allowance 3,671 34,417
Total impaired loans with no related allowance 24,989 26,011
Unpaid principal balance:    
Total impaired loans with an allowance recorded 3,671 34,432
Total impaired loans with no related allowance recorded 25,160 26,042
Related Allowance 539 3,073
Average recorded investment:    
Total impaired loans with an allowance recorded 6,608 32,408
Total impaired loans with no related allowance recorded 39,449 25,696
Interest income recognized:    
Total impaired loans with no related allowance recorded 141 117
Commercial real estate: farmland and commercial | Class of financing receivable
    
Recorded investment:    
Total impaired loans with related allowance 6,678 28,636
Total impaired loans with no related allowance 7,267 13,595
Unpaid principal balance:    
Total impaired loans with an allowance recorded 9,923 28,671
Total impaired loans with no related allowance recorded 9,340 14,129
Related Allowance 2,730 9,754
Average recorded investment:    
Total impaired loans with an allowance recorded 7,342 23,226
Total impaired loans with no related allowance recorded 16,536 9,268
Interest income recognized:    
Total impaired loans with an allowance recorded 92 817
Total impaired loans with no related allowance recorded 8 102
Commercial real estate: multifamily | Class of financing receivable
    
Recorded investment:    
Total impaired loans with no related allowance 353 411
Unpaid principal balance:    
Total impaired loans with no related allowance recorded 353 411
Average recorded investment:    
Total impaired loans with no related allowance recorded 381 439
Residential: first lien | Class of financing receivable
    
Recorded investment:    
Total impaired loans with related allowance   208
Total impaired loans with no related allowance 3,656 2,082
Unpaid principal balance:    
Total impaired loans with an allowance recorded   208
Total impaired loans with no related allowance recorded 3,984 2,116
Related Allowance   23
Average recorded investment:    
Total impaired loans with an allowance recorded   1,117
Total impaired loans with no related allowance recorded 2,876 1,636
Interest income recognized:    
Total impaired loans with no related allowance recorded 60 27
Residential: junior lien | Class of financing receivable
    
Recorded investment:    
Total impaired loans with no related allowance 1,850 1,962
Unpaid principal balance:    
Total impaired loans with no related allowance recorded 1,944 1,970
Average recorded investment:    
Total impaired loans with no related allowance recorded 1,939 1,956
Interest income recognized:    
Total impaired loans with no related allowance recorded 104 122
Consumer | Class of financing receivable
    
Recorded investment:    
Total impaired loans with no related allowance 1,326 1,334
Unpaid principal balance:    
Total impaired loans with no related allowance recorded 1,330 1,337
Average recorded investment:    
Total impaired loans with no related allowance recorded 1,193 1,239
Foreign | Class of financing receivable
    
Recorded investment:    
Total impaired loans with no related allowance 447 46
Unpaid principal balance:    
Total impaired loans with no related allowance recorded 447 46
Average recorded investment:    
Total impaired loans with no related allowance recorded 166 47
Interest income recognized:    
Total impaired loans with no related allowance recorded $ 6 $ 4