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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | $ 73,316 | $ 86,568 | $ 81,789
Depreciation | 28,792 | 27,311 | 26,440
Amortization | 48,895 | 48,275 | 45,392
Assets | 1,971,668 | 1,853,369 |
Private Banks |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 558,451 | 523,214 |
Investment Advisors |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 143,042 | 139,697 |
Institutional Investors |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 109,081 | 117,286 |
Investment Managers |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 318,342 | 278,540 |
Investments In New Businesses |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 33,142 | 19,269 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 71,809 | 85,405 | 79,804
Depreciation | 27,587 | 26,488 | 25,543
Amortization | 48,664 | 48,057 | 45,045
Assets | 1,162,058 | 1,078,006 |
Operating Segments | Private Banks |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 36,763 | 47,526 | 45,940
Depreciation | 13,773 | 16,479 | 13,222
Amortization | 27,312 | 32,696 | 31,675
Operating Segments | Investment Advisors |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 16,572 | 17,450 | 17,610
Depreciation | 4,607 | 3,364 | 3,880
Amortization | 9,668 | 10,930 | 10,458
Operating Segments | Institutional Investors |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 3,863 | 4,020 | 4,319
Depreciation | 1,672 | 1,121 | 1,367
Amortization | 1,707 | 1,599 | 1,674
Operating Segments | Investment Managers |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 13,639 | 15,863 | 11,209
Depreciation | 6,988 | 4,698 | 4,877
Amortization | 9,382 | 2,593 | 1,092
Operating Segments | Investments In New Businesses |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 972 | 546 | 726
Depreciation | 547 | 826 | 2,197
Amortization | 595 | 239 | 146
Corporate, Non-Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 1,507 | 1,163 | 1,985
Depreciation | 1,205 | 823 | 897
Amortization | 231 | 218 | $ 347
Assets | $ 809,610 | $ 775,363 |

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