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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Revenues $ 485,322 $ 424,927 $ 1,416,659 $ 1,240,335
Expenses 322,843 295,550 941,484 865,044
Operating profit (loss) 162,479 129,377 475,175 375,291
Private Banks        
Segment Reporting Information [Line Items]        
Revenues 123,018 114,792 364,302 335,739
Expenses 116,679 113,066 345,057 331,442
Operating profit (loss) 6,339 1,726 19,245 4,297
Investment Advisors        
Segment Reporting Information [Line Items]        
Revenues 124,768 103,189 357,458 299,218
Expenses 62,107 51,519 176,267 154,100
Operating profit (loss) 62,661 51,670 181,191 145,118
Institutional Investors        
Segment Reporting Information [Line Items]        
Revenues 85,759 79,583 255,957 235,309
Expenses 41,643 37,812 122,696 113,016
Operating profit (loss) 44,116 41,771 133,261 122,293
Investment Managers        
Segment Reporting Information [Line Items]        
Revenues 147,412 123,846 426,639 359,815
Expenses 89,594 79,838 257,609 228,795
Operating profit (loss) 57,818 44,008 169,030 131,020
Investments In New Businesses        
Segment Reporting Information [Line Items]        
Revenues 4,365 3,517 12,303 10,254
Expenses 12,820 13,315 39,855 37,691
Operating profit (loss) $ (8,455) $ (9,798) $ (27,552) $ (27,437)