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Revenue from contracts with customers - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Contract assets (receivables) | $ 49,669 | $ 39,861
Deferred revenue (payables) | $ 1,414 | $ 1,118
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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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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