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Goodwill And Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill, Beginning balance     $ 962,282  
Goodwill, Adjustments     6,327  
Goodwill, Ending balance $ 968,609   968,609  
Intangible assets, Beginning balance     116,304  
Intangible assets, Net Additions     4,807  
Intangible assets, Amortization (2,900) $ (2,600) (9,092) $ (10,558)
Intangible assets, Ending balance 112,019   112,019  
Global Wealth Management [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill, Beginning balance     270,779  
Goodwill, Adjustments     5,698  
Goodwill, Ending balance 276,477   276,477  
Intangible assets, Beginning balance     45,231  
Intangible assets, Net Additions     3,800  
Intangible assets, Amortization     (3,391)  
Intangible assets, Ending balance 45,640   45,640  
Institutional Group [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill, Beginning balance     691,503  
Goodwill, Adjustments     629  
Goodwill, Ending balance 692,132   692,132  
Intangible assets, Beginning balance     71,073  
Intangible assets, Net Additions     1,007  
Intangible assets, Amortization     (5,701)  
Intangible assets, Ending balance $ 66,379   $ 66,379