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Revenue from contracts with customers - Schedule of Receivables and Deferred Revenue Balances from Contracts with Customers (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Capitalized Contract Cost [Line Items]
Contract assets (receivables)	$ 47,508	$ 46,187
Deferred revenue (payables)	2,930	930
Investment Banking fees
Capitalized Contract Cost [Line Items]
Deferred revenue (payables)	257	28
Software license fees
Capitalized Contract Cost [Line Items]
Deferred revenue (payables)	2,073	902
IRA fees
Capitalized Contract Cost [Line Items]
Deferred revenue (payables)	600	0
Commission
Capitalized Contract Cost [Line Items]
Contract assets (receivables)	6,736	4,408
Mutual fund and insurance income
Capitalized Contract Cost [Line Items]
Contract assets (receivables)	5,757	5,838
Advisory fees
Capitalized Contract Cost [Line Items]
Contract assets (receivables)	7,005	11,271
Bank deposit sweep income
Capitalized Contract Cost [Line Items]
Contract assets (receivables)	4,123	4,748
Investment Banking fees
Capitalized Contract Cost [Line Items]
Contract assets (receivables)	15,868	14,798
Other
Capitalized Contract Cost [Line Items]
Contract assets (receivables)	$ 8,019	$ 5,124

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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

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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
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ 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
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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