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Revenue from contracts with customers - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]    
Contract assets (receivables) $ 49,669 $ 39,861
Deferred revenue (payables) $ 1,414 $ 1,118
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 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