Goodwill And Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			$ 968,834
Goodwill, Adjustments			15,649
Goodwill, Ending balance	$ 984,483		984,483
Intangible assets, Beginning balance			109,627
Intangible assets, Net Additions			11,923
Intangible assets, Amortization	(3,000)	$ (3,200)	(5,740)	$ (6,246)
Intangible assets, Ending balance	115,810		115,810
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			276,477
Goodwill, Adjustments			14,084
Goodwill, Ending balance	290,561		290,561
Intangible assets, Beginning balance			44,525
Intangible assets, Net Additions			10,800
Intangible assets, Amortization			(2,366)
Intangible assets, Ending balance	52,959		52,959
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			692,357
Goodwill, Adjustments			1,565
Goodwill, Ending balance	693,922		693,922
Intangible assets, Beginning balance			65,102
Intangible assets, Net Additions			1,123
Intangible assets, Amortization			(3,374)
Intangible assets, Ending balance	$ 62,851		$ 62,851