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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Revenues $ 405,057 $ 408,682 $ 404,830 $ 405,598 $ 408,219 $ 386,018 $ 372,331 $ 359,984 $ 1,624,167 $ 1,526,552 $ 1,401,545
Expenses                 1,116,533 1,065,774 966,534
Operating profit (loss)                 507,634 460,778 435,011
Gain on sale of subsidiary                     2,791
Total profit (loss)                     437,802
Private Banks                      
Segment Reporting Information [Line Items]                      
Revenues                 483,097 474,272 457,886
Expenses                 457,894 455,119 421,188
Operating profit (loss)                 25,203 19,153 36,698
Gain on sale of subsidiary                     2,791
Total profit (loss)                     39,489
Investment Advisors                      
Segment Reporting Information [Line Items]                      
Revenues                 399,089 373,473 330,677
Expenses                 212,439 201,833 180,140
Operating profit (loss)                 186,650 171,640 150,537
Gain on sale of subsidiary                     0
Total profit (loss)                     150,537
Institutional Investors                      
Segment Reporting Information [Line Items]                      
Revenues                 333,299 322,457 312,584
Expenses                 163,536 161,640 153,117
Operating profit (loss)                 169,763 160,817 159,467
Gain on sale of subsidiary                     0
Total profit (loss)                     159,467
Investment Managers                      
Segment Reporting Information [Line Items]                      
Revenues                 398,076 349,444 294,390
Expenses                 259,693 226,504 191,127
Operating profit (loss)                 138,383 122,940 103,263
Gain on sale of subsidiary                     0
Total profit (loss)                     103,263
Investments In New Businesses                      
Segment Reporting Information [Line Items]                      
Revenues                 10,606 6,906 6,008
Expenses                 22,971 20,678 20,962
Operating profit (loss)                 $ (12,365) $ (13,772) (14,954)
Gain on sale of subsidiary                     0
Total profit (loss)                     $ (14,954)