Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 24,519,598	$ 21,383,953
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	21,040,224	17,717,617
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	3,238,617	3,313,304
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	$ 240,757	$ 353,032