Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 22,608,169	$ 21,383,953
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	18,726,316	17,717,617
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	3,508,068	3,313,304
Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 373,785	$ 353,032