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Revenue from contracts with customers - Schedule of Receivables and Deferred Revenue Balances from Contracts with Customers (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | $ 45,252 | $ 46,187
Deferred revenue (payables) | 3,344 | 930
Investment Banking fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 184 | 28
Software license fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 1,960 | 902
IRA fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 1,200 | 0
Commission |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 8,918 | 4,408
Mutual fund and insurance income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 5,575 | 5,838
Advisory fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 5,596 | 11,271
Bank deposit sweep income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 4,348 | 4,748
Investment Banking fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 13,428 | 14,798
Other |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | $ 7,387 | $ 5,124

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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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