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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Revenues $ 469,119 $ 581,443
Expenses 336,200 342,620
Operating profit (loss) 132,919 238,823
Private Banks    
Segment Reporting Information [Line Items]    
Revenues 122,603 213,548
Expenses 114,276 121,955
Operating profit (loss) 8,327 91,593
Investment Advisors    
Segment Reporting Information [Line Items]    
Revenues 106,538 119,230
Expenses 63,546 64,520
Operating profit (loss) 42,992 54,710
Institutional Investors    
Segment Reporting Information [Line Items]    
Revenues 74,290 86,839
Expenses 40,868 45,358
Operating profit (loss) 33,422 41,481
Investment Managers    
Segment Reporting Information [Line Items]    
Revenues 160,686 156,901
Expenses 105,866 98,837
Operating profit (loss) 54,820 58,064
Investments In New Businesses    
Segment Reporting Information [Line Items]    
Revenues 5,002 4,925
Expenses 11,644 11,950
Operating profit (loss) $ (6,642) $ (7,025)