Commitments and Contingencies Disclosure [Line Items]

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Concentration of Risk Credit Facilities with the Puerto Rico government that is outstanding.

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The Corporations exposure to municipal loans and securities was concentrated in the municipalities of San Juan, Guaynabo, Carolina and Bayamon.

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Amount of net of teax expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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Amount before allowance of consumer mortgage held and guaranteed by the Puerto Rico Housing Authority.

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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

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Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of valuation and qualifying accounts and reserves.

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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2024
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	$ 37,675,070			$ 37,522,995
FDIC deposit insurance expense	10,035	$ 23,887
FDIC Special Assessment
Commitments and Contingencies Disclosure [Line Items]
FDIC Indemnification Asset		20,400,000	$ 16,300,000
FDIC deposit insurance expense		14,300	71,400
FDIC deposit insurance expense net of tax		$ 9,100	$ 45,300
Commitments to extend credit
Commitments and Contingencies Disclosure [Line Items]
Reserve of potential losses associated with unfunded loan commitments	14,000			15,000
Noncredit commitment
Commitments and Contingencies Disclosure [Line Items]
Investments	2,000			2,000
BVI \| Retail and commerical loans
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	196,000			196,000
Insured or guaranteed by the U.S. Government or its agencies \| Commercial Loans
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	86,500			87,400
Insured or guaranteed by the U.S. Government or its agencies \| Residential mortgage loans
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	2,200,000			2,100,000
PR Government direct exposure
Commitments and Contingencies Disclosure [Line Items]
Total concentration of risk	362,236			336,000
Outstanding concentration of risk	$ 362,236			336,000
Exposure Municipal Loans And Securities	81.00%
PR Government direct exposure \| Loans
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	$ 351,111			323,000
PR Government direct exposure \| Securities Investment
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	11,125			13,000
PR Government Indirect Exposure
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	216,000			220,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA	172,000			176,000
PR Government Indirect Exposure \| PR Housing Bonds backed by second mortgage loans
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	37,000			38,000
USVI Government Direct Exposure \| From USVI Government And Public Corporations
Commitments and Contingencies Disclosure [Line Items]
Total concentration of risk	$ 28,000			$ 28,000