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Allowance for credit losses - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable, Modifications [Line Items]    
Allowance for loan and lease losses reserve $ 13.7  
Commercial    
Financing Receivable, Modifications [Line Items]    
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified $ 158.0 $ 75.0