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Business Segment Information (Schedule of Financial Information about Business Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 1,918,309	$ 1,684,058	$ 1,649,885
Expenses	1,273,074	1,164,173	1,117,265
Operating profit (loss)	645,235	519,885	532,620
Private Banks
Segment Reporting Information [Line Items]
Revenues	493,570	455,393	470,276
Expenses	462,796	446,481	443,136
Operating profit (loss)	30,774	8,912	27,140
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	482,949	407,564	403,778
Expenses	240,334	205,913	208,508
Operating profit (loss)	242,615	201,651	195,270
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	343,805	317,627	322,062
Expenses	168,070	149,909	153,937
Operating profit (loss)	175,735	167,718	168,125
Investment Managers
Segment Reporting Information [Line Items]
Revenues	581,157	489,462	440,796
Expenses	348,655	308,999	282,024
Operating profit (loss)	232,502	180,463	158,772
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	16,828	14,012	12,973
Expenses	53,219	52,871	29,660
Operating profit (loss)	$ (36,391)	$ (38,859)	$ (16,687)

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