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Allowance for credit losses - Allowance for loan losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding balance of loans modified for borrowers under financial difficulties that were subject to payment default | $ 7.0 | $ 25.0 |
Reduction in interest rate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding balance of loans modified for borrowers under financial difficulties that were subject to payment default |  | 1.0 |
Extension of maturity date |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding balance of loans modified for borrowers under financial difficulties that were subject to payment default | 6.0 | 22.0 |
Combination of reduction of interest rate and extension of maturity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding balance of loans modified for borrowers under financial difficulties that were subject to payment default | 1.0 | 2.0 |
Commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings | $ 65.0 | $ 65.0 | $ 17.0

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