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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 423,225	$ 416,254	$ 409,586	$ 400,820	$ 405,057	$ 408,682	$ 404,830	$ 405,598	$ 1,649,885	$ 1,624,167	$ 1,526,552
Expenses									1,117,265	1,116,533	1,065,774
Operating profit (loss)									532,620	507,634	460,778
Private Banks
Segment Reporting Information [Line Items]
Revenues									470,276	483,097	474,272
Expenses									443,136	457,894	455,119
Operating profit (loss)									27,140	25,203	19,153
Investment Advisors
Segment Reporting Information [Line Items]
Revenues									403,778	399,089	373,473
Expenses									208,508	212,439	201,833
Operating profit (loss)									195,270	186,650	171,640
Institutional Investors
Segment Reporting Information [Line Items]
Revenues									322,062	333,299	322,457
Expenses									153,937	163,536	161,640
Operating profit (loss)									168,125	169,763	160,817
Investment Managers
Segment Reporting Information [Line Items]
Revenues									440,796	398,076	349,444
Expenses									282,024	259,693	226,504
Operating profit (loss)									158,772	138,383	122,940
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues									12,973	10,606	6,906
Expenses									29,660	22,971	20,678
Operating profit (loss)									$ (16,687)	$ (12,365)	$ (13,772)

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