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Revenue Recognition Disaggregation of Revenue (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
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | $ 1,124,413 | $ 934,822 |
Interest |  |  |  |  |  |  |  |  |  | 33,477 | 50,723 | $ 52,484
Principal transactions, net |  |  |  |  |  |  |  |  |  | 27,874 | 30,094 | 14,461
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | 12,903 | 17,740 |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | 74,254 | 98,557 |
Revenue |  | $ 422,908 | $ 276,259 | $ 264,730 | $ 234,770 | $ 295,881 | $ 234,793 | $ 250,935 | $ 251,770 | 1,198,667 | 1,033,379 | 958,154
Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 359,917 | 280,069 |
Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 35,180 | 40,045 |
Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 455,261 | 353,671 |
Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 139,763 | 72,779 |
Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 82,535 | 53,432 |
Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 34,829 | 117,422 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 16,928 | 17,404 |
Private Client Division |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 601,543 | 597,763 |
Interest |  |  |  |  |  |  |  |  |  | 25,148 | 35,809 |
Principal transactions, net |  |  |  |  |  |  |  |  |  | 3,300 | 3,341 |
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | 12,092 | 16,496 |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | 40,540 | 55,646 |
Revenue | [1] |  |  |  |  |  |  |  |  | 642,083 | 653,409 | 617,871
Private Client Division | Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 174,346 | 148,661 |
Private Client Division | Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 35,101 | 40,025 |
Private Client Division | Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 326,858 | 264,839 |
Private Client Division | Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 16,093 | 13,528 |
Private Client Division | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 0 |
Private Client Division | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 34,829 | 117,422 |
Private Client Division | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 14,316 | 13,288 |
Asset Management |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 130,261 | 88,753 |
Interest |  |  |  |  |  |  |  |  |  | 0 | 0 |
Principal transactions, net |  |  |  |  |  |  |  |  |  | 0 | 0 |
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | 13 | 2 |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | 13 | 2 |
Revenue | [1] |  |  |  |  |  |  |  |  | 130,274 | 88,755 | 71,696
Asset Management | Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 0 |
Asset Management | Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 3 | 0 |
Asset Management | Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 128,258 | 88,748 |
Asset Management | Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 0 |
Asset Management | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 2,000 | 0 |
Asset Management | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 0 |
Asset Management | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 5 |
Capital markets |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 392,243 | 245,789 |
Interest |  |  |  |  |  |  |  |  |  | 7,749 | 13,302 |
Principal transactions, net |  |  |  |  |  |  |  |  |  | 26,306 | 31,621 |
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | 454 | 118 |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | 34,509 | 45,041 |
Revenue |  |  |  |  |  |  |  |  |  | 426,752 | 290,830 | 272,719
Capital markets | Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 185,542 | 131,380 |
Capital markets | Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 9 | 3 |
Capital markets | Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 2 | 10 |
Capital markets | Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 123,670 | 59,251 |
Capital markets | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 80,535 | 53,432 |
Capital markets | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 0 |
Capital markets | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 2,485 | 1,713 |
Corporate/Other |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 366 | 2,517 |
Interest |  |  |  |  |  |  |  |  |  | 580 | 1,612 |
Principal transactions, net |  |  |  |  |  |  |  |  |  | (1,732) | 4,868 |
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | 344 | 1,124 |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | (808) | (2,132) |
Revenue |  |  |  |  |  |  |  |  |  | (442) | 385 | $ (4,132)
Corporate/Other | Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 29 | 28 |
Corporate/Other | Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 67 | 17 |
Corporate/Other | Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 143 | 74 |
Corporate/Other | Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 0 |
Corporate/Other | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 0 |
Corporate/Other | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 | 0 |
Corporate/Other | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | $ 127 | $ 2,398 |
[1] | (1) Clients investing in the OAM advisory program are charged fees based on the value of AUM. Advisory fees were allocated 10.0% to the Asset Management and 90.0% to the Private Client segments.

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