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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Revenues $ 322,047 $ 280,655 $ 943,248 $ 827,108
Expenses 218,559 204,314 644,415 606,724
Operating profit (loss) 103,488 76,341 298,833 220,384
Gain on sale of subsidiary     5,582 22,112
Total profit (loss)     304,415 242,496
Private Banks [Member]
        
Segment Reporting Information [Line Items]        
Revenues 110,147 97,370 329,508 291,258
Expenses 100,498 95,579 299,645 289,632
Operating profit (loss) 9,649 1,791 29,863 1,626
Gain on sale of subsidiary     5,582 22,112
Total profit (loss)     35,445 23,738
Investment Advisors [Member]
        
Segment Reporting Information [Line Items]        
Revenues 74,469 61,393 210,939 175,868
Expenses 37,796 33,768 108,052 98,291
Operating profit (loss) 36,673 27,625 102,887 77,577
Gain on sale of subsidiary     0 0
Total profit (loss)     102,887 77,577
Institutional Investors [Member]
        
Segment Reporting Information [Line Items]        
Revenues 72,560 63,539 212,211 190,385
Expenses 35,495 33,058 104,615 97,595
Operating profit (loss) 37,065 30,481 107,596 92,790
Gain on sale of subsidiary     0 0
Total profit (loss)     107,596 92,790
Investment Managers [Member]
        
Segment Reporting Information [Line Items]        
Revenues 63,640 57,266 187,099 166,542
Expenses 40,156 37,763 118,789 109,432
Operating profit (loss) 23,484 19,503 68,310 57,110
Gain on sale of subsidiary     0 0
Total profit (loss)     68,310 57,110
Investments In New Businesses [Member]
        
Segment Reporting Information [Line Items]        
Revenues 1,231 1,087 3,491 3,055
Expenses 4,614 4,146 13,314 11,774
Operating profit (loss) (3,383) (3,059) (9,823) (8,719)
Gain on sale of subsidiary     0 0
Total profit (loss)     $ (9,823) $ (8,719)