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Revenue from contracts with customers - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Contract assets (receivables)	$ 38,848	$ 46,187
Deferred revenue (payables)	$ 1,632	$ 930
Commissions
Disaggregation of Revenue [Line Items]
Revenue settlement period (in days)	1 day
Mutual fund and insurance 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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Revenue From Contract With Customer, Settlement Period

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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.

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