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Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities $ 214,826 $ 159,932
Total assets 217,351 166,430
Securities sold, not yet purchased 21,708 13,098
Total liabilities 23,345 19,144
Level 1 [Member] | Mutual Funds And Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 211,725 156,829
Level 1 [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 3,101 3,103
Level 1 [Member] | Derivatives [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 2,525 6,498
Other liabilities 1,637 6,046
Level 1 [Member] | Derivatives [Member] | Foreign Currency Exchange Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 2,525 6,498
Other liabilities 1,637 6,046
Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 1,868,265 1,991,915
Trading account 13,963 40,273
Total assets 1,976,894 2,129,735
Securities sold, not yet purchased    31,388
Total liabilities 91,607 119,485
Level 2 [Member] | Mutual Funds And Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 5,816 5,938
Level 2 [Member] | Private Equity [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other noninterest-bearing investments 5,179 5,339
Level 2 [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 1,759,720 1,874,010
Level 2 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 97,324 104,787
Level 2 [Member] | Asset-Backed Securities [Member] | Trust Preferred - Banks And Insurance [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 184 354
Level 2 [Member] | Asset-Backed Securities [Member] | Other (Including ABS CDOs) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities   6,826
Level 2 [Member] | Asset-Backed Securities [Member] | Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 5,221  
Level 2 [Member] | Derivatives [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 89,487 92,208
Other liabilities 91,607 88,097
Level 2 [Member] | Derivatives [Member] | Interest Rate Related And Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 4,549 9,560
Other liabilities 1,533 734
Level 2 [Member] | Derivatives [Member] | Interest Rate Swaps For Customers [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 84,938 82,648
Other liabilities 90,074 87,363
Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 1,044,101 1,078,948
Total assets 1,172,392 1,207,296
Other liabilities 128 86
Total liabilities 5,176 5,508
Level 3 [Member] | Private Equity [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other noninterest-bearing investments 128,291 128,348
Level 3 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 16,323 17,381
Level 3 [Member] | Asset-Backed Securities [Member] | Trust Preferred - Banks And Insurance [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 965,104 929,356
Level 3 [Member] | Asset-Backed Securities [Member] | Trust Preferred - Real Estate Investment Trusts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 15,407 18,645
Level 3 [Member] | Asset-Backed Securities [Member] | Auction Rate Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 7,113 70,020
Level 3 [Member] | Asset-Backed Securities [Member] | Other (Including ABS CDOs) [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities   43,546
Level 3 [Member] | Asset-Backed Securities [Member] | Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 40,154  
Level 3 [Member] | Derivatives [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other liabilities 5,048 5,422
Level 3 [Member] | Derivatives [Member] | Total Return Swap [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other liabilities 5,048 5,422
Estimated Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 3,127,192 3,230,795
Trading account 13,963 40,273
Total assets 3,366,637 3,503,461
Securities sold, not yet purchased 21,708 44,486
Other liabilities 128 86
Total liabilities 120,128 144,137
Estimated Fair Value [Member] | Mutual Funds And Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 217,541 162,767
Estimated Fair Value [Member] | Private Equity [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other noninterest-bearing investments 133,470 133,687
Estimated Fair Value [Member] | Available-for-sale Securities [Member] | U.S. Treasury, Agencies And Corporations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 1,762,821 1,877,113
Estimated Fair Value [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 113,647 122,168
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Trust Preferred - Banks And Insurance [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 965,288 929,710
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Trust Preferred - Real Estate Investment Trusts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 15,407 18,645
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Auction Rate Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 7,113 70,020
Estimated Fair Value [Member] | Asset-Backed Securities [Member] | Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities 45,375 50,372
Estimated Fair Value [Member] | Derivatives [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 92,012 98,706
Other liabilities 98,292 99,565
Estimated Fair Value [Member] | Derivatives [Member] | Interest Rate Related And Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 4,549 9,560
Other liabilities 1,533 734
Estimated Fair Value [Member] | Derivatives [Member] | Interest Rate Swaps For Customers [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 84,938 82,648
Other liabilities 90,074 87,363
Estimated Fair Value [Member] | Derivatives [Member] | Foreign Currency Exchange Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 2,525 6,498
Other liabilities 1,637 6,046
Estimated Fair Value [Member] | Derivatives [Member] | Total Return Swap [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other liabilities $ 5,048 $ 5,422