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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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Amount of other addition (reduction) in allowance reserve for credit loss.

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