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Revenue from contracts with customers - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | $ 49,669 | $ 39,861
Deferred revenue (payables) | 1,414 | 1,118
Investment banking fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 807 | 1,118
Software license fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 607 | 0
Commission |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 5,388 | 4,554
Mutual fund income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 5,479 | 5,365
Advisory fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 4,191 | 5,746
Bank deposit sweep income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 4,966 | 5,223
Investment banking fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 21,181 | 12,847
Other |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | $ 8,464 | $ 6,126

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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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