Goodwill and Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	$ 1,034,679	$ 1,034,679
Goodwill, Net Additions	159,395
Goodwill, Ending balance	1,194,074	1,034,679	$ 1,034,679
Intangible assets, Beginning balance	119,655	119,655
Intangible assets, Net Additions	58,133
Intangible assets, Amortization	(16,015)	(12,557)	(12,135)
Intangible assets, Ending balance	161,773	119,655	119,655
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance		340,395
Goodwill, Net Additions	4,586
Goodwill, Ending balance	344,981		340,395
Intangible assets, Beginning balance		60,532
Intangible assets, Amortization	(7,253)
Intangible assets, Ending balance	53,279		60,532
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance		694,284
Goodwill, Net Additions	154,809
Goodwill, Ending balance	849,093		694,284
Intangible assets, Beginning balance		$ 59,123
Intangible assets, Net Additions	58,133
Intangible assets, Amortization	(8,762)
Intangible assets, Ending balance	$ 108,494		$ 59,123