Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 24,160,777	$ 24,519,598
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	20,153,135	21,040,224
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	3,730,332	3,238,617
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	$ 277,310	$ 240,757