Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total assets	$ 29,744,764	$ 26,604,254
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	24,504,877	21,743,202
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	4,654,018	3,733,661
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	$ 585,869	$ 1,127,391