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Goodwill and Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill, Beginning balance     $ 1,034,679  
Goodwill, Adjustments     21,678  
Goodwill, Ending balance $ 1,056,357   1,056,357  
Intangible assets, Beginning balance     119,655  
Intangible assets, Net Additions     7,212  
Intangible assets, Amortization (3,500) $ (3,000) (7,140) $ (5,740)
Intangible assets, Ending balance 119,727   119,727  
Global Wealth Management [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill, Beginning balance     340,395  
Goodwill, Adjustments     6,336  
Goodwill, Ending balance 346,731   346,731  
Intangible assets, Beginning balance     60,532  
Intangible assets, Amortization     (3,675)  
Intangible assets, Ending balance 56,857   56,857  
Institutional Group [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Goodwill, Beginning balance     694,284  
Goodwill, Adjustments     15,342  
Goodwill, Ending balance 709,626   709,626  
Intangible assets, Beginning balance     59,123  
Intangible assets, Net Additions     7,212  
Intangible assets, Amortization     (3,465)  
Intangible assets, Ending balance $ 62,870   $ 62,870