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Allowance for credit losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding balance of loans modified for borrowers under financial difficulties that were subject to payment default |  | $ 33.0 | $ 10.0
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 |  | 28.0 | 8.0
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 |  | 4.0 | 2.0
Commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified | $ 75.0 | $ 75.0 | $ 21.0
Banco Popular de Puerto Rico |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Reduction in ACL | $ (13.5) |  |

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