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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Revenues $ 489,057 $ 481,670 $ 958,176 $ 1,063,113
Expenses 344,087 342,011 680,287 684,631
Operating profit (loss) 144,970 139,659 277,889 378,482
Private Banks        
Segment Reporting Information [Line Items]        
Revenues 134,099 124,184 256,702 337,732
Expenses 116,061 121,060 230,337 243,015
Operating profit (loss) 18,038 3,124 26,365 94,717
Investment Advisors        
Segment Reporting Information [Line Items]        
Revenues 109,580 113,194 216,118 232,424
Expenses 64,178 63,375 127,724 127,895
Operating profit (loss) 45,402 49,819 88,394 104,529
Institutional Investors        
Segment Reporting Information [Line Items]        
Revenues 75,145 83,483 149,435 170,322
Expenses 45,516 43,925 86,384 89,283
Operating profit (loss) 29,629 39,558 63,051 81,039
Investment Managers        
Segment Reporting Information [Line Items]        
Revenues 165,339 155,926 326,025 312,827
Expenses 107,761 100,807 213,627 199,644
Operating profit (loss) 57,578 55,119 112,398 113,183
Investments In New Businesses        
Segment Reporting Information [Line Items]        
Revenues 4,894 4,883 9,896 9,808
Expenses 10,571 12,844 22,215 24,794
Operating profit (loss) $ (5,677) $ (7,961) $ (12,319) $ (14,986)