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Business Segment Information (Schedule of Financial Information about Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 443,723	$ 424,927	$ 400,646	$ 414,762	$ 423,225	$ 416,254	$ 409,586	$ 400,820	$ 1,684,058	$ 1,649,885	$ 1,624,167
Expenses									1,164,173	1,117,265	1,116,533
Operating profit (loss)									519,885	532,620	507,634
Private Banks
Segment Reporting Information [Line Items]
Revenues									455,393	470,276	483,097
Expenses									446,481	443,136	457,894
Operating profit (loss)									8,912	27,140	25,203
Investment Advisors
Segment Reporting Information [Line Items]
Revenues									407,564	403,778	399,089
Expenses									205,913	208,508	212,439
Operating profit (loss)									201,651	195,270	186,650
Institutional Investors
Segment Reporting Information [Line Items]
Revenues									317,627	322,062	333,299
Expenses									149,909	153,937	163,536
Operating profit (loss)									167,718	168,125	169,763
Investment Managers
Segment Reporting Information [Line Items]
Revenues									489,462	440,796	398,076
Expenses									308,999	282,024	259,693
Operating profit (loss)									180,463	158,772	138,383
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues									14,012	12,973	10,606
Expenses									52,871	29,660	22,971
Operating profit (loss)									$ (38,859)	$ (16,687)	$ (12,365)

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