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Revenue from contracts with customers - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | $ 34,680 | $ 32,773
Deferred revenue (payables) | 1,803 | 900
Investment banking fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 1,120 | 900
IRA fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred revenue (payables) | 683 | 0
Commission |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 3,428 | 3,533
Mutual fund income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 5,472 | 4,993
Advisory fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 3,602 | 5,368
Bank deposit sweep income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 5,173 | 9,057
Investment banking fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | 9,775 | 5,136
Other |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets (receivables) | $ 7,230 | $ 4,686

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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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