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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($)	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	$ 39,111,956,000				$ 39,111,956,000		$ 37,522,995,000
FDIC deposit insurance expense	10,873,000	$ 10,433,000			30,315,000	$ 44,901,000
Maximum Automated Clearing House (ACH) transaction settlement exposure	47,400,000				47,400,000
FDIC Special Assessment
Commitments and Contingencies Disclosure [Line Items]
FDIC deposit insurance expense			$ 14,300,000	$ 71,400,000
FDIC deposit insurance expense net of tax			$ 9,100,000	$ 45,300,000
Commitments to extend credit
Commitments and Contingencies Disclosure [Line Items]
Reserve of potential losses associated with unfunded loan commitments	14,000,000				14,000,000		15,000,000
Noncredit commitment
Commitments and Contingencies Disclosure [Line Items]
Investments	6,000,000				6,000,000		6,000,000
BVI
Commitments and Contingencies Disclosure [Line Items]
Total concentration of risk					0
BVI | Retail and commerical loans
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	193,000,000				193,000,000		196,000,000
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	80,900,000				80,900,000		87,400,000
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	2,400,000,000				2,400,000,000		2,100,000,000
PR Government direct exposure
Commitments and Contingencies Disclosure [Line Items]
Total concentration of risk					391,323,000		336,000,000
Outstanding concentration of risk	$ 341,923,000				$ 341,923,000		336,000,000
Exposure Municipal Loans And Securities	76.00%				76.00%
PR Government direct exposure | Loans
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	$ 333,167,000				$ 333,167,000		323,000,000
PR Government direct exposure | Securities Investment
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	8,756,000				8,756,000		13,000,000
PR Government Indirect Exposure
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	208,000,000				208,000,000		220,000,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA	165,000,000				165,000,000		176,000,000
PR Government Indirect Exposure | PR Housing Bonds backed by second mortgage loans
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	$ 36,000,000				36,000,000		38,000,000
USVI Government Direct Exposure | From USVI Government And Public Corporations
Commitments and Contingencies Disclosure [Line Items]
Total concentration of risk					$ 28,000,000		$ 28,000,000

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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 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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