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Allowance for Probable Loan Losses (Details 5) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Financing receivable recorded investment    
Past due 30-59 days $ 24,300 $ 16,870
Past due 60-89 days 6,650 9,434
Past due 90 days or greater 53,128 88,529
Past due 90 days or greater and still accruing 21,750 19,848
Past due, total 84,078 114,833
Loans, current 5,172,105 5,295,170
Portfolio, total 5,256,183 5,410,003
Commercial
    
Financing receivable recorded investment    
Past due 30-59 days 3,452 3,734
Past due 60-89 days 1,162 861
Past due 90 days or greater 1,202 23,239
Past due 90 days or greater and still accruing 692 1,029
Past due, total 5,816 27,834
Loans, current 817,106 802,690
Portfolio, total 822,922 830,524
Commercial real estate: other construction and land development
    
Financing receivable recorded investment    
Past due 30-59 days 1,139 2,685
Past due 60-89 days 372 2,896
Past due 90 days or greater 25,668 50,618
Past due 90 days or greater and still accruing 5,266 11,507
Past due, total 27,179 56,199
Loans, current 1,270,468 1,417,272
Portfolio, total 2,658,034 2,615,878
Commercial real estate: farmland and commercial
    
Financing receivable recorded investment    
Past due 30-59 days 6,517 3,077
Past due 60-89 days 1,348 817
Past due 90 days or greater 17,973 6,600
Past due 90 days or greater and still accruing 9,364 1,585
Past due, total 25,838 10,494
Loans, current 1,696,545 1,678,069
Portfolio, total 1,722,383 1,688,563
Commercial real estate: multifamily
    
Financing receivable recorded investment    
Past due 30-59 days 76 73
Past due 60-89 days   185
Past due 90 days or greater 440 473
Past due, total 516 731
Loans, current 112,213 96,060
Portfolio, total 112,729 96,791
Residential: first lien
    
Financing receivable recorded investment    
Past due 30-59 days 7,818 4,884
Past due 60-89 days 2,260 3,436
Past due 90 days or greater 5,764 5,136
Past due 90 days or greater and still accruing 4,417 3,472
Past due, total 15,842 13,456
Loans, current 520,635 519,999
Portfolio, total 536,477 533,455
Residential: junior lien
    
Financing receivable recorded investment    
Past due 30-59 days 1,272 703
Past due 60-89 days 562 272
Past due 90 days or greater 368 457
Past due 90 days or greater and still accruing 321 277
Past due, total 2,202 1,432
Loans, current 405,299 414,095
Portfolio, total 407,501 415,527
Consumer
    
Financing receivable recorded investment    
Past due 30-59 days 2,369 1,518
Past due 60-89 days 502 587
Past due 90 days or greater 1,230 1,505
Past due 90 days or greater and still accruing 1,207 1,477
Past due, total 4,101 3,610
Loans, current 104,012 122,437
Portfolio, total 108,113 126,047
Foreign
    
Financing receivable recorded investment    
Past due 30-59 days 1,657 196
Past due 60-89 days 444 380
Past due 90 days or greater 483 501
Past due 90 days or greater and still accruing 483 501
Past due, total 2,584 1,077
Loans, current 245,827 244,548
Portfolio, total $ 248,411 $ 245,625