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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Capital Expenditures	$ 73,316	$ 86,568	$ 81,789
Depreciation	28,792	27,311	26,440
Amortization	48,895	48,275	45,392
Assets	1,971,668	1,853,369
Private Banks
Segment Reporting Information [Line Items]
Assets	558,451	523,214
Investment Advisors
Segment Reporting Information [Line Items]
Assets	143,042	139,697
Institutional Investors
Segment Reporting Information [Line Items]
Assets	109,081	117,286
Investment Managers
Segment Reporting Information [Line Items]
Assets	318,342	278,540
Investments In New Businesses
Segment Reporting Information [Line Items]
Assets	33,142	19,269
Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	71,809	85,405	79,804
Depreciation	27,587	26,488	25,543
Amortization	48,664	48,057	45,045
Assets	1,162,058	1,078,006
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital Expenditures	36,763	47,526	45,940
Depreciation	13,773	16,479	13,222
Amortization	27,312	32,696	31,675
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital Expenditures	16,572	17,450	17,610
Depreciation	4,607	3,364	3,880
Amortization	9,668	10,930	10,458
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital Expenditures	3,863	4,020	4,319
Depreciation	1,672	1,121	1,367
Amortization	1,707	1,599	1,674
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital Expenditures	13,639	15,863	11,209
Depreciation	6,988	4,698	4,877
Amortization	9,382	2,593	1,092
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital Expenditures	972	546	726
Depreciation	547	826	2,197
Amortization	595	239	146
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Capital Expenditures	1,507	1,163	1,985
Depreciation	1,205	823	897
Amortization	231	218	$ 347
Assets	$ 809,610	$ 775,363

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