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Revenue from contracts with customers - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Contract with customer, receivables | $ 39,861,000 | $ 32,773,000
Contract assets | 0 | 0
Total deferred revenue | 1,118,000 | 900,000
Capitalized contract costs | $ 1,900,000 | $ 1,400,000
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 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 accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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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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