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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Revenues $ 271,879 $ 237,898
Expenses 198,332 179,042
Gross Profit 73,547 58,856
Gain on sale of subsidiary 22,112  
Total Profit (Loss) 95,659  
Private Banks [Member]
    
Segment Reporting Information [Line Items]    
Revenues 98,746 87,988
Expenses 96,298 87,517
Gross Profit 2,448 471
Gain on sale of subsidiary 22,112  
Total Profit (Loss) 24,560  
Investment Advisors [Member]
    
Segment Reporting Information [Line Items]    
Revenues 55,191 49,468
Expenses 31,625 29,301
Gross Profit 23,566 20,167
Gain on sale of subsidiary 0  
Total Profit (Loss) 23,566  
Institutional Investors [Member]
    
Segment Reporting Information [Line Items]    
Revenues 63,162 53,317
Expenses 31,509 28,100
Gross Profit 31,653 25,217
Gain on sale of subsidiary 0  
Total Profit (Loss) 31,653  
Investment Managers [Member]
    
Segment Reporting Information [Line Items]    
Revenues 53,820 46,211
Expenses 35,162 30,426
Gross Profit 18,658 15,785
Gain on sale of subsidiary 0  
Total Profit (Loss) 18,658  
Investments In New Businesses [Member]
    
Segment Reporting Information [Line Items]    
Revenues 960 914
Expenses 3,738 3,698
Gross Profit (2,778) (2,784)
Gain on sale of subsidiary 0  
Total Profit (Loss) $ (2,778)