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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Capital Expenditures	$ 78,567	$ 77,171	$ 73,316
Depreciation	30,959	29,436	28,792
Amortization	52,975	51,419	48,895
Assets	2,167,256	2,151,370
Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	75,727	74,857	71,809
Depreciation	29,918	28,130	27,587
Amortization	52,745	51,189	48,664
Assets	1,290,041	1,242,085
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital Expenditures	29,061	33,068	36,763
Depreciation	16,206	14,349	13,773
Amortization	30,240	29,054	27,312
Assets	557,953	567,796
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital Expenditures	15,588	17,413	16,572
Depreciation	4,821	4,653	4,607
Amortization	10,694	10,311	9,668
Assets	169,197	165,556
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital Expenditures	3,958	4,057	3,863
Depreciation	1,214	1,600	1,672
Amortization	1,707	1,726	1,707
Assets	119,784	115,012
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital Expenditures	25,909	18,970	13,639
Depreciation	7,336	7,145	6,988
Amortization	9,365	9,358	9,382
Assets	421,093	373,986
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital Expenditures	1,211	1,349	972
Depreciation	341	383	547
Amortization	739	740	595
Assets	22,014	19,735
Corporate Overhead
Segment Reporting Information [Line Items]
Capital Expenditures	2,840	2,314	1,507
Depreciation	1,041	1,306	1,205
Amortization	230	230	$ 231
Assets	$ 877,215	$ 909,285

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