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Allowance for Probable Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing receivable recorded investment    
Past due 30-59 days $ 22,682 $ 48,472
Past due 60-89 days 38,425 19,594
Past due 90 days or greater 64,902 71,614
Past due 90 days or greater and still accruing 36,367 14,288
Past due, total 126,009 139,680
Loans, current 4,757,019 4,913,795
Portfolio, total 4,883,028 5,053,475
Commercial
    
Financing receivable recorded investment    
Past due 30-59 days 6,497 5,180
Past due 60-89 days 6,764 1,369
Past due 90 days or greater 24,902 1,842
Past due 90 days or greater and still accruing 24,239 1,490
Past due, total 38,163 8,391
Loans, current 778,553 765,425
Portfolio, total 816,716 773,816
Commercial real estate: other construction and land development
    
Financing receivable recorded investment    
Past due 30-59 days 3,855 23,426
Past due 60-89 days 25,458 4,360
Past due 90 days or greater 18,716 49,887
Past due 90 days or greater and still accruing 864 979
Past due, total 48,029 77,673
Loans, current 1,144,244 1,195,716
Portfolio, total 1,192,273 1,273,389
Commercial real estate: farmland and commercial
    
Financing receivable recorded investment    
Past due 30-59 days 3,288 9,467
Past due 60-89 days 2,298 10,269
Past due 90 days or greater 8,486 7,879
Past due 90 days or greater and still accruing 537 1,231
Past due, total 14,072 27,615
Loans, current 1,656,859 1,637,072
Portfolio, total 1,670,931 1,664,687
Commercial real estate: multifamily
    
Financing receivable recorded investment    
Past due 30-59 days 161 450
Past due 90 days or greater 504 411
Past due 90 days or greater and still accruing 137  
Past due, total 665 861
Loans, current 96,868 120,738
Portfolio, total 97,533 121,599
Residential: first lien
    
Financing receivable recorded investment    
Past due 30-59 days 3,754 6,207
Past due 60-89 days 2,272 2,757
Past due 90 days or greater 10,892 10,295
Past due 90 days or greater and still accruing 9,470 9,382
Past due, total 16,918 19,259
Loans, current 434,390 476,463
Portfolio, total 451,308 495,722
Residential: junior lien
    
Financing receivable recorded investment    
Past due 30-59 days 1,007 1,433
Past due 60-89 days 354 378
Past due 90 days or greater 442 368
Past due 90 days or greater and still accruing 223 320
Past due, total 1,803 2,179
Loans, current 380,028 397,969
Portfolio, total 381,831 400,148
Consumer
    
Financing receivable recorded investment    
Past due 30-59 days 1,926 1,643
Past due 60-89 days 348 408
Past due 90 days or greater 809 912
Past due 90 days or greater and still accruing 793 866
Past due, total 3,083 2,963
Loans, current 76,371 91,146
Portfolio, total 79,454 94,109
Foreign
    
Financing receivable recorded investment    
Past due 30-59 days 2,194 666
Past due 60-89 days 931 53
Past due 90 days or greater 151 20
Past due 90 days or greater and still accruing 104 20
Past due, total 3,276 739
Loans, current 189,706 229,266
Portfolio, total $ 192,982 $ 230,005