Goodwill and Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			$ 1,181,998
Goodwill, Adjustments			315
Goodwill, Ending balance	$ 1,182,313		1,182,313
Intangible assets, Beginning balance			140,984
Intangible assets, Adjustments / Sale of ZCM			280
Intangible assets, Amortization	(4,500)	$ (4,700)	(8,759)	$ (9,760)
Intangible assets, Ending balance	132,505		132,505
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			335,009
Goodwill, Ending balance	335,009		335,009
Intangible assets, Beginning balance			44,671
Intangible assets, Amortization			(2,823)
Intangible assets, Ending balance	41,848		41,848
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			846,989
Goodwill, Adjustments			315
Goodwill, Ending balance	847,304		847,304
Intangible assets, Beginning balance			96,313
Intangible assets, Adjustments / Sale of ZCM			280
Intangible assets, Amortization			(5,936)
Intangible assets, Ending balance	$ 90,657		$ 90,657