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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Revenues $ 335,397 $ 335,622 $ 337,745 $ 325,444 $ 322,757 $ 322,047 $ 318,815 $ 302,386 $ 1,334,208 $ 1,266,005 $ 1,126,132
Expenses                 921,544 864,332 824,279
Operating profit (loss)                 412,664 401,673 301,853
Gain on sale of subsidiary                 2,791 5,582 22,112
Total Profit (Loss)                 415,455 407,255 323,965
Private Banks [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 456,516 441,467 397,138
Expenses                 410,975 399,620 392,399
Operating profit (loss)                 45,541 41,847 4,739
Gain on sale of subsidiary                 2,791 5,582 22,112
Total Profit (Loss)                 48,332 47,429 26,851
Investment Advisors [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 306,620 283,811 241,252
Expenses                 171,968 146,500 133,962
Operating profit (loss)                 134,652 137,311 107,290
Gain on sale of subsidiary                 0 0 0
Total Profit (Loss)                 134,652 137,311 107,290
Institutional Investors [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 297,568 284,677 257,658
Expenses                 145,851 140,659 133,218
Operating profit (loss)                 151,717 144,018 124,440
Gain on sale of subsidiary                 0 0 0
Total Profit (Loss)                 151,717 144,018 124,440
Investment Managers [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 267,963 251,310 226,081
Expenses                 172,094 159,176 148,977
Operating profit (loss)                 95,869 92,134 77,104
Gain on sale of subsidiary                 0 0 0
Total Profit (Loss)                 95,869 92,134 77,104
Investments In New Businesses [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 5,541 4,740 4,003
Expenses                 20,656 18,377 15,723
Operating profit (loss)                 (15,115) (13,637) (11,720)
Gain on sale of subsidiary                 0 0 0
Total Profit (Loss)                 $ (15,115) $ (13,637) $ (11,720)