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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | $ 81,789 | $ 73,881 | $ 63,346
Depreciation | 26,440 | 24,044 | 22,448
Amortization | 45,392 | 42,630 | 38,679
Assets | 1,636,823 | 1,588,628 |
Private Banks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 45,940 | 41,972 | 30,883
Depreciation | 13,222 | 12,348 | 13,393
Amortization | 31,675 | 29,819 | 24,993
Assets | 471,435 | 451,079 |
Investment Advisors [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 17,610 | 13,206 | 13,783
Depreciation | 3,880 | 3,410 | 2,507
Amortization | 10,458 | 9,880 | 9,228
Assets | 160,717 | 138,459 |
Institutional Investors [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 4,319 | 5,301 | 4,575
Depreciation | 1,367 | 1,200 | 1,041
Amortization | 1,674 | 1,558 | 1,430
Assets | 109,879 | 105,443 |
Investment Managers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 11,209 | 10,119 | 9,505
Depreciation | 4,877 | 4,040 | 2,917
Amortization | 1,092 | 1,029 | 954
Assets | 158,621 | 154,432 |
Investments In New Businesses [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 726 | 736 | 2,547
Depreciation | 2,197 | 2,278 | 1,983
Amortization | 146 | 116 | 1,846
Assets | 4,910 | 5,355 |
Total From Business Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 79,804 | 71,334 | 61,293
Depreciation | 25,543 | 23,276 | 21,841
Amortization | 45,045 | 42,402 | 38,451
Assets | 905,562 | 854,768 |
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 1,985 | 2,547 | 2,053
Depreciation | 897 | 768 | 607
Amortization | 347 | 228 | $ 228
Assets | $ 731,261 | $ 733,860 |

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