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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

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