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Revenue from contracts with customers - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Contract assets (receivables) | $ 32,828 | $ 39,861
Deferred revenue (payables) | $ 2,419 | $ 1,118
Commission from Equity Securities Transactions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue settlement period (in days) | 1 day |
Mutual fund and insurance income |  |
Disaggregation of Revenue [Line Items] |  |
Revenue settlement period (in days) | 90 days |
Advisory fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue settlement period (in days) | 90 days |
Investment banking - capital markets |  |
Disaggregation of Revenue [Line Items] |  |
Revenue settlement period (in days) | 90 days |
Bank deposit sweep income |  |
Disaggregation of Revenue [Line Items] |  |
Revenue settlement period (in days) | 30 days |

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