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Revenue from contracts with customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | $ 1,072,500 | $ 1,047,158 |
Interest | 104,550 | 60,713 | $ 36,482
Principal transactions, net | 65,347 | 21,031 | 23,984
Other | 6,428 | (17,961) |
Total other sources of revenue | 176,325 | 63,783 |
Total revenue | 1,248,825 | 1,110,941 | 1,394,035
Corporate/Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 434 | 610 |
Interest | 4,249 | 1,394 |
Principal transactions, net | 6,375 | (4,566) |
Other | 1,683 | 760 |
Total other sources of revenue | 12,307 | (2,412) |
Total revenue | 12,741 | (1,802) | (1,327)
Commissions from sales and trading |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 317,768 | 339,175 |
Commissions from sales and trading | Corporate/Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 23 | 40 |
Mutual fund income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 31,480 | 31,207 |
Mutual fund income | Corporate/Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 16 | 26 |
Advisory fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 415,679 | 425,615 |
Advisory fees | Corporate/Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 229 | 34 |
Investment banking - capital markets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 48,042 | 42,833 |
Investment banking - capital markets | Corporate/Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Investment banking - advisory |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 69,623 | 84,696 |
Investment banking - advisory | Corporate/Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Bank deposit sweep income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 172,807 | 104,558 |
Bank deposit sweep income | Corporate/Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 17,101 | 19,074 |
Other | Corporate/Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 166 | 510 |
Private Client | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 701,537 | 647,342 |
Interest | 85,105 | 51,866 |
Principal transactions, net | 3,400 | (4,013) |
Other | 11,712 | (19,515) |
Total other sources of revenue | 100,217 | 28,338 |
Total revenue | 801,754 | 675,680 | 665,060
Private Client | Commissions from sales and trading | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 155,039 | 159,441 |
Private Client | Mutual fund income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 31,457 | 31,173 |
Private Client | Advisory fees | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 319,191 | 326,240 |
Private Client | Investment banking - capital markets | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 7,543 | 9,352 |
Private Client | Investment banking - advisory | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 127 |
Private Client | Bank deposit sweep income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 172,807 | 104,558 |
Private Client | Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 15,500 | 16,451 |
Asset Management | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 96,258 | 99,224 |
Interest | 0 | 0 |
Principal transactions, net | 0 | 0 |
Other | (7,825) | 18 |
Total other sources of revenue | (7,825) | 18 |
Total revenue | 88,433 | 99,242 | 104,598
Asset Management | Commissions from sales and trading | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Asset Management | Mutual fund income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Asset Management | Advisory fees | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 96,259 | 99,224 |
Asset Management | Investment banking - capital markets | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Asset Management | Investment banking - advisory | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Asset Management | Bank deposit sweep income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Asset Management | Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | (1) | 0 |
Capital markets | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 274,271 | 299,982 |
Interest | 15,196 | 7,453 |
Principal transactions, net | 55,572 | 29,610 |
Other | 858 | 776 |
Total other sources of revenue | 71,626 | 37,839 |
Total revenue | 345,897 | 337,821 | $ 625,704
Capital markets | Commissions from sales and trading | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 162,706 | 179,694 |
Capital markets | Mutual fund income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 7 | 8 |
Capital markets | Advisory fees | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 117 |
Capital markets | Investment banking - capital markets | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 40,499 | 33,481 |
Capital markets | Investment banking - advisory | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 69,623 | 84,569 |
Capital markets | Bank deposit sweep income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 0 | 0 |
Capital markets | Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | $ 1,436 | $ 2,113 |

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