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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Revenues $ 475,651 $ 400,646 $ 931,337 $ 815,408
Expenses 317,308 282,943 618,641 569,494
Operating profit (loss) 158,343 117,703 312,696 245,914
Private Banks        
Segment Reporting Information [Line Items]        
Revenues 123,676 107,726 241,284 220,947
Expenses 117,654 107,723 228,378 218,376
Operating profit (loss) 6,022 3 12,906 2,571
Investment Advisors        
Segment Reporting Information [Line Items]        
Revenues 119,396 93,708 232,690 196,029
Expenses 59,133 50,149 114,160 102,581
Operating profit (loss) 60,263 43,559 118,530 93,448
Institutional Investors        
Segment Reporting Information [Line Items]        
Revenues 85,699 76,523 170,198 155,726
Expenses 41,895 36,937 81,053 75,204
Operating profit (loss) 43,804 39,586 89,145 80,522
Investment Managers        
Segment Reporting Information [Line Items]        
Revenues 142,808 119,340 279,227 235,969
Expenses 84,995 74,668 168,015 148,957
Operating profit (loss) 57,813 44,672 111,212 87,012
Investments In New Businesses        
Segment Reporting Information [Line Items]        
Revenues 4,072 3,349 7,938 6,737
Expenses 13,631 13,466 27,035 24,376
Operating profit (loss) $ (9,559) $ (10,117) $ (19,097) $ (17,639)