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Revenue from contracts with customers - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Contract assets (receivables) | $ 34,252 | $ 32,773
Deferred revenue (payables) | $ 2,860 | $ 900
Commission From Equity Securities Transactions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue settlement period (in days) | 2 days |
Commissions From Corporate Bond 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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