Goodwill and Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	$ 1,034,679
Goodwill, Adjustments	21,432
Goodwill, Ending balance	1,056,111
Intangible assets, Beginning balance	119,655
Intangible assets, Net Additions	7,768
Intangible assets, Amortization	(3,593)	$ (2,738)
Intangible assets, Ending balance	123,830
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	340,395
Goodwill, Adjustments	6,998
Goodwill, Ending balance	347,393
Intangible assets, Beginning balance	60,532
Intangible assets, Amortization	(1,847)
Intangible assets, Ending balance	58,685
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	694,284
Goodwill, Adjustments	14,434
Goodwill, Ending balance	708,718
Intangible assets, Beginning balance	59,123
Intangible assets, Net Additions	7,768
Intangible assets, Amortization	(1,746)
Intangible assets, Ending balance	$ 65,145