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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | $ 77,171 | $ 73,316 | $ 86,568
Depreciation | 29,436 | 28,792 | 27,311
Amortization | 51,419 | 48,895 | 48,275
Assets | 2,151,370 | 1,971,668 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 74,857 | 71,809 | 85,405
Depreciation | 28,130 | 27,587 | 26,488
Amortization | 51,189 | 48,664 | 48,057
Assets | 1,242,085 | 1,162,058 |
Operating Segments | Private Banks |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 33,068 | 36,763 | 47,526
Depreciation | 14,349 | 13,773 | 16,479
Amortization | 29,054 | 27,312 | 32,696
Assets | 567,796 | 558,451 |
Operating Segments | Investment Advisors |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 17,413 | 16,572 | 17,450
Depreciation | 4,653 | 4,607 | 3,364
Amortization | 10,311 | 9,668 | 10,930
Assets | 165,556 | 143,042 |
Operating Segments | Institutional Investors |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 4,057 | 3,863 | 4,020
Depreciation | 1,600 | 1,672 | 1,121
Amortization | 1,726 | 1,707 | 1,599
Assets | 115,012 | 109,081 |
Operating Segments | Investment Managers |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 18,970 | 13,639 | 15,863
Depreciation | 7,145 | 6,988 | 4,698
Amortization | 9,358 | 9,382 | 2,593
Assets | 373,986 | 318,342 |
Operating Segments | Investments In New Businesses |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 1,349 | 972 | 546
Depreciation | 383 | 547 | 826
Amortization | 740 | 595 | 239
Assets | 19,735 | 33,142 |
Corporate Overhead |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 2,314 | 1,507 | 1,163
Depreciation | 1,306 | 1,205 | 823
Amortization | 230 | 231 | $ 218
Assets | $ 909,285 | $ 809,610 |

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