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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Schedule of segment reporting information by segment          
Interest income, including loan fees $ 70,179 $ 71,182 $ 136,244 $ 137,694  
Total interest income 70,179 71,182 136,244 137,694  
Interest Expense 7,219 8,787 14,682 18,190  
Total interest expense 7,219 8,787 14,682 18,190  
Net interest income 62,960 62,395 121,562 119,504  
Provisions for credit losses         7,068  
Net interest income after provision for credit losses 62,960 62,395 121,562 112,436  
Noninterest income 2,292 5,994 7,548 15,972  
Noninterest expense 28,949 37,155 59,161 73,460  
Segment pretax profit (loss) 36,303 31,234 69,949 54,948  
Segment assets 6,523,963 6,460,193 6,523,963 6,460,193 6,482,915
Business Financial Centers [Member]
          
Schedule of segment reporting information by segment          
Interest income, including loan fees 37,573 39,723 75,244 79,162  
Credit for funds provided 6,277 6,016 12,624 12,042  
Total interest income 43,850 45,739 87,868 91,204  
Interest Expense 1,865 2,628 3,916 5,896  
Charge for funds used 1,044 1,373 2,141 2,659  
Total interest expense 2,909 4,001 6,057 8,555  
Net interest income 40,941 41,738 81,811 82,649  
Provisions for credit losses            
Net interest income after provision for credit losses 40,941 41,738 81,811 82,649  
Noninterest income 5,807 5,390 11,790 10,602  
Noninterest expense 11,297 13,296 23,195 25,927  
Segment pretax profit (loss) 35,451 33,832 70,406 67,324  
Segment assets 4,869,845 4,877,715 4,869,845 4,877,715  
Treasury [Member]
          
Schedule of segment reporting information by segment          
Interest income, including loan fees 14,983 16,510 30,346 31,731  
Total interest income 14,983 16,510 30,346 31,731  
Interest Expense 4,569 5,311 9,117 10,602  
Charge for funds used 10,098 8,369 20,126 16,671  
Total interest expense 14,667 13,680 29,243 27,273  
Net interest income 316 2,830 1,103 4,458  
Provisions for credit losses            
Net interest income after provision for credit losses 316 2,830 1,103 4,458  
Noninterest income   (119)   (119)  
Noninterest expense 186 192 381 408  
Segment pretax profit (loss) 130 2,519 722 3,931  
Segment assets 2,832,792 2,544,731 2,832,792 2,544,731  
Other [Member]
          
Schedule of segment reporting information by segment          
Interest income, including loan fees 17,623 14,949 30,654 26,801  
Credit for funds provided 2,550 2,428 5,150 5,116  
Total interest income 20,173 17,377 35,804 31,917  
Interest Expense 785 848 1,649 1,692  
Charge for funds used (2,315) (1,298) (4,493) (2,172)  
Total interest expense (1,530) (450) (2,844) (480)  
Net interest income 21,703 17,827 38,648 32,397  
Provisions for credit losses         7,068  
Net interest income after provision for credit losses 21,703 17,827 38,648 25,329  
Noninterest income (3,515) 723 (4,242) 5,489  
Noninterest expense 17,466 23,667 35,585 47,125  
Segment pretax profit (loss) 722 (5,117) (1,179) (16,307)  
Segment assets 895,925 734,823 895,925 734,823  
Eliminations [Member]
          
Schedule of segment reporting information by segment          
Credit for funds provided (8,827) (8,444) (17,774) (17,158)  
Total interest income (8,827) (8,444) (17,774) (17,158)  
Charge for funds used (8,827) (8,444) (17,774) (17,158)  
Total interest expense (8,827) (8,444) (17,774) (17,158)  
Provisions for credit losses            
Segment pretax profit (loss)   0      
Segment assets $ (2,074,599) $ (1,697,076) $ (2,074,599) $ (1,697,076)