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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | $ 17,758 | $ 17,162 | $ 33,630 | $ 27,740
Depreciation | 8,286 | 8,424 | 16,384 | 16,733
Amortization | 16,508 | 14,723 | 33,395 | 29,075
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 17,313 | 16,744 | 32,740 | 27,162
Depreciation | 8,107 | 8,075 | 16,022 | 16,053
Amortization | 16,438 | 14,598 | 33,254 | 28,892
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 8,541 | 8,594 | 15,763 | 14,423
Depreciation | 5,554 | 4,178 | 10,660 | 8,310
Amortization | 8,261 | 8,633 | 16,800 | 17,209
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 3,423 | 3,580 | 6,450 | 5,888
Depreciation | 469 | 1,417 | 925 | 2,706
Amortization | 3,158 | 2,909 | 6,391 | 5,536
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 1,028 | 884 | 1,977 | 1,395
Depreciation | 285 | 353 | 574 | 711
Amortization | 2,257 | 427 | 4,540 | 853
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 4,113 | 3,373 | 8,137 | 5,004
Depreciation | 1,755 | 2,027 | 3,775 | 4,080
Amortization | 2,577 | 2,444 | 5,153 | 4,924
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 208 | 313 | 413 | 452
Depreciation | 44 | 100 | 88 | 246
Amortization | 185 | 185 | 370 | 370
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 445 | 418 | 890 | 578
Depreciation | 179 | 349 | 362 | 680
Amortization | $ 70 | $ 125 | $ 141 | $ 183

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