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Business Segment Information (Schedule of Financial Information about Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 443,723 | $ 424,927 | $ 400,646 | $ 414,762 | $ 423,225 | $ 416,254 | $ 409,586 | $ 400,820 | $ 1,684,058 | $ 1,649,885 | $ 1,624,167
Expenses |  |  |  |  |  |  |  |  | 1,164,173 | 1,117,265 | 1,116,533
Operating profit (loss) |  |  |  |  |  |  |  |  | 519,885 | 532,620 | 507,634
Private Banks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 455,393 | 470,276 | 483,097
Expenses |  |  |  |  |  |  |  |  | 446,481 | 443,136 | 457,894
Operating profit (loss) |  |  |  |  |  |  |  |  | 8,912 | 27,140 | 25,203
Investment Advisors |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 407,564 | 403,778 | 399,089
Expenses |  |  |  |  |  |  |  |  | 205,913 | 208,508 | 212,439
Operating profit (loss) |  |  |  |  |  |  |  |  | 201,651 | 195,270 | 186,650
Institutional Investors |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 317,627 | 322,062 | 333,299
Expenses |  |  |  |  |  |  |  |  | 149,909 | 153,937 | 163,536
Operating profit (loss) |  |  |  |  |  |  |  |  | 167,718 | 168,125 | 169,763
Investment Managers |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 489,462 | 440,796 | 398,076
Expenses |  |  |  |  |  |  |  |  | 308,999 | 282,024 | 259,693
Operating profit (loss) |  |  |  |  |  |  |  |  | 180,463 | 158,772 | 138,383
Investments In New Businesses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 14,012 | 12,973 | 10,606
Expenses |  |  |  |  |  |  |  |  | 52,871 | 29,660 | 22,971
Operating profit (loss) |  |  |  |  |  |  |  |  | $ (38,859) | $ (16,687) | $ (12,365)

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