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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Revenues $ 481,670 $ 475,651 $ 1,063,113 $ 931,337
Expenses 342,011 317,308 684,631 618,641
Operating profit (loss) 139,659 158,343 378,482 312,696
Private Banks        
Segment Reporting Information [Line Items]        
Revenues 124,184 123,676 337,732 241,284
Expenses 121,060 117,654 243,015 228,378
Operating profit (loss) 3,124 6,022 94,717 12,906
Investment Advisors        
Segment Reporting Information [Line Items]        
Revenues 113,194 119,396 232,424 232,690
Expenses 63,375 59,133 127,895 114,160
Operating profit (loss) 49,819 60,263 104,529 118,530
Institutional Investors        
Segment Reporting Information [Line Items]        
Revenues 83,483 85,699 170,322 170,198
Expenses 43,925 41,895 89,283 81,053
Operating profit (loss) 39,558 43,804 81,039 89,145
Investment Managers        
Segment Reporting Information [Line Items]        
Revenues 155,926 142,808 312,827 279,227
Expenses 100,807 84,995 199,644 168,015
Operating profit (loss) 55,119 57,813 113,183 111,212
Investments In New Businesses        
Segment Reporting Information [Line Items]        
Revenues 4,883 4,072 9,808 7,938
Expenses 12,844 13,631 24,794 27,035
Operating profit (loss) $ (7,961) $ (9,559) $ (14,986) $ (19,097)