Commitments and contingencies - Commitments - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	$ 32,372,925	$ 29,506,225
Commitments to extend credit
Commitments and Contingencies Disclosure [Line Items]
Reserve of potential losses associated with unfunded loan commitments	8,800	7,900
Noncredit commitment
Commitments and Contingencies Disclosure [Line Items]
Investments	4,800	1,000
Residential mortgage loans
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	1,600,000	1,600,000
Paycheck Protection Program
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	38,000	353,000
BVI \| Retail and commerical loans
Commitments and Contingencies Disclosure [Line Items]
Loans And Leases Receivable Gross Carrying Amount	214,000	221,000
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	72,000	67,000
PR Government direct exposure
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	326,987	349,000
Total concentration of risk	$ 374,176	367,000
Exposure Municipal Loans And Securities	73.00%
PR Government direct exposure \| Loans
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	$ 302,285	319,000
PR Government direct exposure \| Securities Investment
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	24,702	30,000
PR Government Indirect Exposure
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	251,000	275,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA	209,000	232,000
PR Government Indirect Exposure \| PR Housing Bonds backed by second mortgage loans
Commitments and Contingencies Disclosure [Line Items]
Outstanding concentration of risk	42,000	43,000
USVI Government Direct Exposure \| From USVI Government And Public Corporations
Commitments and Contingencies Disclosure [Line Items]
Total concentration of risk	$ 28,000	$ 70,000

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 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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Sum of the carrying amounts as of the balance sheet date of all investments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Amount of valuation and qualifying accounts and reserves.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
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