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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 416,254	$ 408,682	$ 1,226,660	$ 1,219,110
Expenses	279,380	281,320	829,481	833,686
Operating profit (loss)	136,874	127,362	397,179	385,424
Private Banks
Segment Reporting Information [Line Items]
Revenues	117,250	118,449	351,601	361,739
Expenses	110,788	116,471	329,540	343,515
Operating profit (loss)	6,462	1,978	22,061	18,224
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	103,033	102,550	297,916	301,632
Expenses	51,509	53,287	154,569	158,792
Operating profit (loss)	51,524	49,263	143,347	142,840
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	80,337	83,466	241,559	252,391
Expenses	37,268	40,497	115,383	122,617
Operating profit (loss)	43,069	42,969	126,176	129,774
Investment Managers
Segment Reporting Information [Line Items]
Revenues	112,186	101,275	326,037	295,696
Expenses	71,889	65,296	209,326	191,955
Operating profit (loss)	40,297	35,979	116,711	103,741
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	3,448	2,942	9,547	7,652
Expenses	7,926	5,769	20,663	16,807
Operating profit (loss)	$ (4,478)	$ (2,827)	$ (11,116)	$ (9,155)

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