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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Schedule of segment reporting information by segment      
Interest income, including loan fees $ 66,065 $ 66,512  
Total interest income 66,065 66,512  
Interest Expense 7,463 9,403  
Total interest expense 7,463 9,403  
Net interest income 58,602 57,109  
Provision for credit losses    7,068  
Net interest income after provision for credit losses 58,602 50,041  
Non-interest income 5,256 9,978  
Non-interest expense 30,212 36,305  
Segment pretax profit (loss) 33,646 23,714  
Segment assets 6,506,083 6,498,352 6,482,915
Business Financial Centers [Member]
      
Schedule of segment reporting information by segment      
Interest income, including loan fees 37,671 39,439  
Credit for funds provided (1) 6,347 6,026  
Total interest income 44,018 45,465  
Interest Expense 2,051 3,268  
Charge for funds used (1) 1,097 1,286  
Total interest expense 3,148 4,554  
Net interest income 40,870 40,911  
Provision for credit losses       
Net interest income after provision for credit losses 40,870 40,911  
Non-interest income 5,983 5,212  
Non-interest expense 11,898 12,631  
Segment pretax profit (loss) 34,955 33,492  
Segment assets 4,838,109 4,903,546  
Treasury [Member]
      
Schedule of segment reporting information by segment      
Interest income, including loan fees 15,363 15,221  
Total interest income 15,363 15,221  
Interest Expense 4,548 5,291  
Charge for funds used (1) 10,028 8,302  
Total interest expense 14,576 13,593  
Net interest income 787 1,628  
Provision for credit losses       
Net interest income after provision for credit losses 787 1,628  
Non-interest expense 195 216  
Segment pretax profit (loss) 592 1,412  
Segment assets 2,749,505 2,540,188  
Other [Member]
      
Schedule of segment reporting information by segment      
Interest income, including loan fees 13,031 11,852  
Credit for funds provided (1) 2,600 2,688  
Total interest income 15,631 14,540  
Interest Expense 864 844  
Charge for funds used (1) (2,178) (874)  
Total interest expense (1,314) (30)  
Net interest income 16,945 14,570  
Provision for credit losses    7,068  
Net interest income after provision for credit losses 16,945 7,502  
Non-interest income (727) 4,766  
Non-interest expense 18,119 23,458  
Segment pretax profit (loss) (1,901) (11,190)  
Segment assets 922,575 724,182  
Eliminations [Member]
      
Schedule of segment reporting information by segment      
Credit for funds provided (1) (8,947) (8,714)  
Total interest income (8,947) (8,714)  
Charge for funds used (1) (8,947) (8,714)  
Total interest expense (8,947) (8,714)  
Provision for credit losses       
Segment assets $ (20,041,106) $ (1,669,564)