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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | $ 14,130 | $ 15,229 | $ 33,479 | $ 34,850
Depreciation | 8,367 | 8,781 | 16,756 | 17,312
Amortization | 10,485 | 9,630 | 20,871 | 19,054
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 13,865 | 14,867 | 32,672 | 33,873
Depreciation | 7,426 | 8,575 | 14,866 | 16,902
Amortization | 10,377 | 9,565 | 20,684 | 18,925
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 4,586 | 8,001 | 11,018 | 17,072
Depreciation | 2,832 | 5,450 | 5,736 | 10,804
Amortization | 5,089 | 4,718 | 10,200 | 9,364
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 1,987 | 3,615 | 5,152 | 7,954
Depreciation | 2,190 | 549 | 4,371 | 1,017
Amortization | 2,148 | 1,945 | 4,270 | 3,763
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 730 | 457 | 1,849 | 1,105
Depreciation | 598 | 303 | 1,202 | 585
Amortization | 1,876 | 1,829 | 3,768 | 3,653
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 6,389 | 2,592 | 14,064 | 7,158
Depreciation | 1,636 | 2,049 | 3,215 | 4,041
Amortization | 81 | 181 | 81 | 358
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 173 | 202 | 589 | 584
Depreciation | 170 | 224 | 342 | 455
Amortization | 1,183 | 892 | 2,365 | 1,787
Corporate overhead |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 265 | 362 | 807 | 977
Depreciation | 941 | 206 | 1,890 | 410
Amortization | $ 108 | $ 65 | $ 187 | $ 129

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