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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | $ 23,516 | $ 14,266 | $ 57,146 | $ 42,006
Depreciation | 8,558 | 8,408 | 24,942 | 25,141
Amortization | 10,382 | 14,674 | 43,777 | 43,749
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 23,030 | 13,847 | 55,770 | 41,009
Depreciation | 8,380 | 8,238 | 24,402 | 24,291
Amortization | 10,325 | 14,603 | 43,579 | 43,495
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 8,404 | 6,173 | 24,167 | 20,596
Depreciation | 5,050 | 4,980 | 15,710 | 13,290
Amortization | 4,515 | 8,526 | 21,315 | 25,735
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 3,476 | 2,896 | 9,926 | 8,784
Depreciation | 513 | 499 | 1,438 | 3,205
Amortization | 1,736 | 3,014 | 8,127 | 8,550
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 1,080 | 720 | 3,057 | 2,115
Depreciation | 283 | 271 | 857 | 982
Amortization | 1,808 | 427 | 6,348 | 1,280
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 9,843 | 3,722 | 17,980 | 8,726
Depreciation | 2,498 | 2,428 | 6,273 | 6,508
Amortization | 2,121 | 2,451 | 7,274 | 7,375
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 227 | 336 | 640 | 788
Depreciation | 36 | 60 | 124 | 306
Amortization | 145 | 185 | 515 | 555
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 486 | 419 | 1,376 | 997
Depreciation | 178 | 170 | 540 | 850
Amortization | $ 57 | $ 71 | $ 198 | $ 254

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