Goodwill And Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	$ 968,834
Goodwill, Net Additions	65,845
Goodwill, Ending balance	1,034,679	$ 968,834
Intangible assets, Beginning balance	109,627
Intangible assets, Net Additions	22,585
Intangible assets, Amortization	(12,557)	(12,135)	$ (14,427)
Intangible assets, Ending balance	119,655	109,627
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	276,477
Goodwill, Net Additions	63,918
Goodwill, Ending balance	340,395	276,477
Intangible assets, Beginning balance	44,525
Intangible assets, Net Additions	21,780
Intangible assets, Amortization	(5,773)
Intangible assets, Ending balance	60,532	44,525
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	692,357
Goodwill, Net Additions	1,927
Goodwill, Ending balance	694,284	692,357
Intangible assets, Beginning balance	65,102
Intangible assets, Net Additions	805
Intangible assets, Amortization	(6,784)
Intangible assets, Ending balance	$ 59,123	$ 65,102