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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Revenues $ 476,759 $ 471,334 $ 1,434,935 $ 1,534,447
Expenses 337,290 330,751 1,017,577 1,015,382
Operating profit (loss) 139,469 140,583 417,358 519,065
Private Banks        
Segment Reporting Information [Line Items]        
Revenues 121,469 122,660 378,171 460,392
Expenses 113,105 116,661 343,442 359,676
Operating profit (loss) 8,364 5,999 34,729 100,716
Investment Advisors        
Segment Reporting Information [Line Items]        
Revenues 110,461 109,565 326,579 341,989
Expenses 64,280 61,150 192,004 189,045
Operating profit (loss) 46,181 48,415 134,575 152,944
Institutional Investors        
Segment Reporting Information [Line Items]        
Revenues 70,479 78,260 219,914 248,582
Expenses 39,953 42,149 126,337 131,432
Operating profit (loss) 30,526 36,111 93,577 117,150
Investment Managers        
Segment Reporting Information [Line Items]        
Revenues 169,293 156,015 495,318 468,842
Expenses 108,078 100,876 321,705 300,520
Operating profit (loss) 61,215 55,139 173,613 168,322
Investments In New Businesses        
Segment Reporting Information [Line Items]        
Revenues 5,057 4,834 14,953 14,642
Expenses 11,874 9,915 34,089 34,709
Operating profit (loss) $ (6,817) $ (5,081) $ (19,136) $ (20,067)