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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | $ 14,848 | $ 23,516 | $ 49,698 | $ 57,146
Depreciation | 9,197 | 8,558 | 26,509 | 24,942
Amortization | 9,797 | 10,382 | 28,851 | 43,777
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 14,541 | 23,030 | 48,414 | 55,770
Depreciation | 8,950 | 8,380 | 25,852 | 24,402
Amortization | 9,723 | 10,325 | 28,648 | 43,579
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 7,580 | 8,404 | 24,652 | 24,167
Depreciation | 5,565 | 5,050 | 16,369 | 15,710
Amortization | 4,852 | 4,515 | 14,216 | 21,315
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 3,545 | 3,476 | 11,499 | 9,926
Depreciation | 540 | 513 | 1,557 | 1,438
Amortization | 1,933 | 1,736 | 5,696 | 8,127
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 390 | 1,080 | 1,495 | 3,057
Depreciation | 338 | 283 | 923 | 857
Amortization | 1,834 | 1,808 | 5,487 | 6,348
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 2,804 | 9,843 | 10,002 | 17,980
Depreciation | 2,424 | 2,498 | 6,789 | 6,273
Amortization | 959 | 2,121 | 2,815 | 7,274
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 222 | 227 | 766 | 640
Depreciation | 83 | 36 | 214 | 124
Amortization | 145 | 145 | 434 | 515
Corporate overhead |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 307 | 486 | 1,284 | 1,376
Depreciation | 247 | 178 | 657 | 540
Amortization | $ 74 | $ 57 | $ 203 | $ 198

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