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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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