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Allowance for Probable Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing receivable recorded investment    
Past due 30-59 days $ 26,432 $ 48,472
Past due 60-89 days 5,927 19,594
Past due 90 days or greater 50,068 71,614
Past due 90 days or greater and still accruing 13,680 14,288
Past due, total 82,427 139,680
Loans, current 4,795,895 4,913,795
Portfolio, total 4,878,322 5,053,475
Commercial
   
Financing receivable recorded investment    
Past due 30-59 days 4,739 5,180
Past due 60-89 days 1,364 1,369
Past due 90 days or greater 5,511 1,842
Past due 90 days or greater and still accruing 350 1,490
Past due, total 11,614 8,391
Loans, current 796,627 765,425
Portfolio, total 808,241 773,816
Commercial real estate: other construction and land development
   
Financing receivable recorded investment    
Past due 30-59 days 8,933 23,426
Past due 60-89 days 41 4,360
Past due 90 days or greater 24,901 49,887
Past due 90 days or greater and still accruing 1,032 979
Past due, total 33,875 77,673
Loans, current 1,176,616 1,195,716
Portfolio, total 1,210,491 1,273,389
Commercial real estate: farmland and commercial
   
Financing receivable recorded investment    
Past due 30-59 days 3,687 9,467
Past due 60-89 days 1,350 10,269
Past due 90 days or greater 6,371 7,879
Past due 90 days or greater and still accruing 935 1,231
Past due, total 11,408 27,615
Loans, current 1,611,645 1,637,072
Portfolio, total 1,623,053 1,664,687
Commercial real estate: multifamily
   
Financing receivable recorded investment    
Past due 30-59 days 186 450
Past due 90 days or greater 382 411
Past due, total 568 861
Loans, current 101,408 120,738
Portfolio, total 101,976 121,599
Residential: first lien
   
Financing receivable recorded investment    
Past due 30-59 days 4,930 6,207
Past due 60-89 days 2,216 2,757
Past due 90 days or greater 11,445 10,295
Past due 90 days or greater and still accruing 10,117 9,382
Past due, total 18,591 19,259
Loans, current 443,912 476,463
Portfolio, total 462,503 495,722
Residential: junior lien
   
Financing receivable recorded investment    
Past due 30-59 days 680 1,433
Past due 60-89 days 211 378
Past due 90 days or greater 419 368
Past due 90 days or greater and still accruing 273 320
Past due, total 1,310 2,179
Loans, current 378,499 397,969
Portfolio, total 379,809 400,148
Consumer
   
Financing receivable recorded investment    
Past due 30-59 days 1,288 1,643
Past due 60-89 days 504 408
Past due 90 days or greater 985 912
Past due 90 days or greater and still accruing 919 866
Past due, total 2,777 2,963
Loans, current 80,422 91,146
Portfolio, total 83,199 94,109
Foreign
   
Financing receivable recorded investment    
Past due 30-59 days 1,989 666
Past due 60-89 days 241 53
Past due 90 days or greater 54 20
Past due 90 days or greater and still accruing 54 20
Past due, total 2,284 739
Loans, current 206,766 229,266
Portfolio, total $ 209,050 $ 230,005