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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 19,909 | $ 17,739 | $ 57,336 | $ 55,023
Depreciation | 7,409 | 7,255 | 22,162 | 21,515
Amortization | 12,947 | 12,405 | 38,407 | 36,420
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 19,246 | 17,279 | 55,702 | 53,889
Depreciation | 7,089 | 6,938 | 21,178 | 20,610
Amortization | 12,890 | 12,347 | 38,236 | 36,247
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 8,018 | 7,999 | 25,240 | 27,767
Depreciation | 3,640 | 3,427 | 10,774 | 10,069
Amortization | 7,322 | 6,943 | 21,680 | 20,317
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 4,468 | 3,927 | 12,973 | 12,471
Depreciation | 1,162 | 1,168 | 3,506 | 3,378
Amortization | 2,609 | 2,445 | 7,682 | 7,203
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 1,070 | 962 | 2,990 | 2,926
Depreciation | 393 | 410 | 1,212 | 1,310
Amortization | 440 | 427 | 1,300 | 1,281
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 5,311 | 4,104 | 13,535 | 9,994
Depreciation | 1,793 | 1,796 | 5,384 | 5,411
Amortization | 2,334 | 2,346 | 7,019 | 7,036
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 379 | 287 | 964 | 731
Depreciation | 101 | 137 | 302 | 442
Amortization | 185 | 186 | 555 | 410
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 663 | 460 | 1,634 | 1,134
Depreciation | 320 | 317 | 984 | 905
Amortization | $ 57 | $ 58 | $ 171 | $ 173

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