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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Capital expenditure	$ 15,872	$ 10,578
Depreciation	8,098	8,309
Amortization	16,887	14,352
Operating Segments
Segment Reporting Information [Line Items]
Capital expenditure	15,427	10,418
Depreciation	7,915	7,978
Amortization	16,816	14,294
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital expenditure	7,222	5,829
Depreciation	5,106	4,132
Amortization	8,539	8,576
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital expenditure	3,027	2,308
Depreciation	456	1,289
Amortization	3,233	2,627
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital expenditure	949	511
Depreciation	289	358
Amortization	2,283	426
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital expenditure	4,024	1,631
Depreciation	2,020	2,053
Amortization	2,576	2,480
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital expenditure	205	139
Depreciation	44	146
Amortization	185	185
Corporate
Segment Reporting Information [Line Items]
Capital expenditure	445	160
Depreciation	183	331
Amortization	$ 71	$ 58

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