Goodwill And Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			$ 968,834
Goodwill, Adjustments			56,880
Goodwill, Ending balance	$ 1,025,714		1,025,714
Intangible assets, Beginning balance			109,627
Intangible assets, Net Additions			18,037
Intangible assets, Amortization	(3,000)	$ (2,900)	(8,741)	$ (9,092)
Intangible assets, Ending balance	118,923		118,923
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			276,477
Goodwill, Adjustments			54,969
Goodwill, Ending balance	331,446		331,446
Intangible assets, Beginning balance			44,525
Intangible assets, Net Additions			17,180
Intangible assets, Amortization			(3,662)
Intangible assets, Ending balance	58,043		58,043
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			692,357
Goodwill, Adjustments			1,911
Goodwill, Ending balance	694,268		694,268
Intangible assets, Beginning balance			65,102
Intangible assets, Net Additions			857
Intangible assets, Amortization			(5,079)
Intangible assets, Ending balance	$ 60,880		$ 60,880