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Business Segment Information (Schedule of Financial Information about Business Segments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenues $ 1,919,793 $ 1,991,037 $ 1,918,309
Expenses 1,363,028 1,347,120 1,273,074
Operating profit (loss) 556,765 643,917 645,235
Private Banks      
Segment Reporting Information [Line Items]      
Revenues 503,317 575,625 493,570
Expenses 455,820 473,209 462,796
Operating profit (loss) 47,497 102,416 30,774
Investment Advisors      
Segment Reporting Information [Line Items]      
Revenues 436,298 447,766 482,949
Expenses 259,142 251,650 240,334
Operating profit (loss) 177,156 196,116 242,615
Institutional Investors      
Segment Reporting Information [Line Items]      
Revenues 289,708 323,353 343,805
Expenses 165,455 172,252 168,070
Operating profit (loss) 124,253 151,101 175,735
Investment Managers      
Segment Reporting Information [Line Items]      
Revenues 670,486 624,918 581,157
Expenses 437,174 404,850 348,655
Operating profit (loss) 233,312 220,068 232,502
Investments in New Businesses      
Segment Reporting Information [Line Items]      
Revenues 19,984 19,375 16,828
Expenses 45,437 45,159 53,219
Operating profit (loss) $ (25,453) $ (25,784) $ (36,391)