Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total assets	$ 28,141,581	$ 26,604,254
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	23,560,912	21,743,202
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	3,996,969	3,733,661
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	$ 583,700	$ 1,127,391