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Business Segment Information (Schedule of Financial Information about Business Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 1,991,037	$ 1,918,309	$ 1,684,058
Expenses	1,347,120	1,273,074	1,164,173
Operating profit (loss)	643,917	645,235	519,885
Private Banks
Segment Reporting Information [Line Items]
Revenues	575,625	493,570	455,393
Expenses	473,209	462,796	446,481
Operating profit (loss)	102,416	30,774	8,912
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	447,766	482,949	407,564
Expenses	251,650	240,334	205,913
Operating profit (loss)	196,116	242,615	201,651
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	323,353	343,805	317,627
Expenses	172,252	168,070	149,909
Operating profit (loss)	151,101	175,735	167,718
Investment Managers
Segment Reporting Information [Line Items]
Revenues	624,918	581,157	489,462
Expenses	404,850	348,655	308,999
Operating profit (loss)	220,068	232,502	180,463
Investments in New Businesses
Segment Reporting Information [Line Items]
Revenues	19,375	16,828	14,012
Expenses	45,159	53,219	52,871
Operating profit (loss)	$ (25,784)	$ (36,391)	$ (38,859)

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