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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Revenues $ 471,334 $ 485,322 $ 1,534,447 $ 1,416,659
Expenses 330,751 322,843 1,015,382 941,484
Operating profit (loss) 140,583 162,479 519,065 475,175
Private Banks        
Segment Reporting Information [Line Items]        
Revenues 122,660 123,018 460,392 364,302
Expenses 116,661 116,679 359,676 345,057
Operating profit (loss) 5,999 6,339 100,716 19,245
Investment Advisors        
Segment Reporting Information [Line Items]        
Revenues 109,565 124,768 341,989 357,458
Expenses 61,150 62,107 189,045 176,267
Operating profit (loss) 48,415 62,661 152,944 181,191
Institutional Investors        
Segment Reporting Information [Line Items]        
Revenues 78,260 85,759 248,582 255,957
Expenses 42,149 41,643 131,432 122,696
Operating profit (loss) 36,111 44,116 117,150 133,261
Investment Managers        
Segment Reporting Information [Line Items]        
Revenues 156,015 147,412 468,842 426,639
Expenses 100,876 89,594 300,520 257,609
Operating profit (loss) 55,139 57,818 168,322 169,030
Investments In New Businesses        
Segment Reporting Information [Line Items]        
Revenues 4,834 4,365 14,642 12,303
Expenses 9,915 12,820 34,709 39,855
Operating profit (loss) $ (5,081) $ (8,455) $ (20,067) $ (27,552)