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Revenue from contracts with customers - Schedule of Receivables and Deferred Revenue Balances from Contracts with Customers (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | $ 50,121 | $ 72,794
Deferred revenue (payables) | 2,442 | 2,132
Investment Banking fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 1,153 | 286
Software license fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 1,289 | 1,846
Commission |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 7,618 | 5,011
Mutual fund and insurance income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 6,199 | 6,106
Advisory fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 4,873 | 24,166
Bank deposit sweep income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 4,192 | 3,876
Investment Banking fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 21,544 | 25,414
Other |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | $ 5,695 | $ 8,221

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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 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: 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 3: 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 4: 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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