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Revenues from contracts with customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 301,421 | $ 257,461 | $ 972,062 | $ 730,008
Interest | (9,340) | (7,540) | (26,915) | (24,650)
Principal transactions, net | 4,494 | 7,703 | 21,664 | 18,899
Other | 87 | 3,555 | 8,276 | 2,202
Total other sources of revenue | 13,921 | 18,798 | 56,855 | 45,751
Total revenue | (315,342) | (276,259) | (1,028,917) | (775,759)
Commissions from sales and trading |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 81,747 | 84,134 | 272,863 | 270,687
Mutual Fund Income [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,142 | 8,107 | 27,668 | 26,439
Advisory fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 116,751 | 88,595 | 332,399 | 250,740
Investment banking - capital markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 35,087 | 35,539 | 177,644 | 90,373
Investment banking - advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 51,814 | 30,706 | 138,500 | 47,786
Bank deposit sweep income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,909 | 4,619 | 11,629 | 30,567
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,971 | 5,761 | 11,359 | 13,416
Private Client |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 153,470 | 131,089 | 460,515 | 403,295
Interest | (7,624) | (5,939) | (21,335) | (18,753)
Principal transactions, net | (189) | 1,223 | 1,987 | 1,164
Other | (41) | 2,846 | 7,913 | 1,128
Total other sources of revenue | 7,394 | 10,008 | 31,235 | 21,045
Total revenue | (160,864) | (141,097) | (491,750) | (424,340)
Private Client | Commissions from sales and trading |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 42,214 | 40,742 | 135,122 | 129,652
Private Client | Mutual Fund Income [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,134 | 8,097 | 27,575 | 26,414
Private Client | Advisory fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 89,849 | 67,949 | 255,701 | 193,297
Private Client | Investment banking - capital markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 5,599 | 3,962 | 19,879 | 11,382
Private Client | Investment banking - advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 250 | 0
Private Client | Bank deposit sweep income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,909 | 4,619 | 11,629 | 30,567
Private Client | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,765 | 5,720 | 10,359 | 11,983
Asset Management |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 26,890 | 20,634 | 76,658 | 57,414
Interest | 0 | 5 | 0 | 0
Principal transactions, net | 0 | 0 | 0 | 0
Other | 4 | 3 | 10 | 9
Total other sources of revenue | 4 | (2) | 10 | 9
Total revenue | (26,894) | (20,632) | (76,668) | (57,423)
Asset Management | Commissions from sales and trading |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Asset Management | Mutual Fund Income [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 3
Asset Management | Advisory fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 26,890 | 20,634 | 76,658 | 57,411
Asset Management | Investment banking - capital markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Asset Management | Investment banking - advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Asset Management | Bank deposit sweep income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Asset Management | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Capital markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 121,035 | 105,706 | 434,723 | 269,117
Interest | (1,631) | (1,539) | (5,449) | (5,390)
Principal transactions, net | 5,804 | 6,357 | 19,636 | 19,853
Other | 115 | 687 | 321 | 741
Total other sources of revenue | 7,550 | 8,583 | 25,406 | 25,984
Total revenue | (128,585) | (114,289) | (460,129) | (295,101)
Capital markets | Commissions from sales and trading |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 39,535 | 43,389 | 137,742 | 141,013
Capital markets | Mutual Fund Income [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2 | 2 | 6 | 7
Capital markets | Advisory fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 3 | 2
Capital markets | Investment banking - capital markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 29,488 | 31,577 | 157,765 | 78,991
Capital markets | Investment banking - advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 51,814 | 30,706 | 138,250 | 47,786
Capital markets | Bank deposit sweep income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Capital markets | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 196 | 32 | 957 | 1,318
Corporate/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 26 | 32 | 166 | 182
Interest | (85) | (67) | (131) | (507)
Principal transactions, net | (1,121) | 123 | 41 | (2,118)
Other | 9 | 19 | 32 | 324
Total other sources of revenue | (1,027) | 209 | 204 | (1,287)
Total revenue | 1,001 | (241) | (370) | 1,105
Corporate/Other | Commissions from sales and trading |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (2) | 3 | (1) | 22
Corporate/Other | Mutual Fund Income [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6 | 8 | 87 | 15
Corporate/Other | Advisory fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12 | 12 | 37 | 30
Corporate/Other | Investment banking - capital markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate/Other | Investment banking - advisory |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate/Other | Bank deposit sweep income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate/Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 10 | $ 9 | $ 43 | $ 115

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