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
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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
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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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- Definition

Cash received from principal payments made on loans related to operating activities.

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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
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Commitments and contingencies - Commitments - Additional Information (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
	Jul. 02, 2021	Sep. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure
Exposure Municipal Loans And Securities		75.00%
Loans And Leases Receivable Gross Carrying Amount		$ 29,089,241	$ 29,588,430
Commitments To Extend Credit
Commitments and Contingencies Disclosure
Reserve of potential losses associated with unfunded loan commitments		8,000	16,000
Noncredit commitment
Commitments and Contingencies Disclosure
Investments		1,400	1,400
Residential mortgage loans
Commitments and Contingencies Disclosure
Loans And Leases Receivable Gross Carrying Amount		1,600,000	1,800,000
SBA loans under PPP program
Commitments and Contingencies Disclosure
Loans And Leases Receivable Gross Carrying Amount		670,000	1,300,000
BVI \| Retail and commerical loans
Commitments and Contingencies Disclosure
Loans And Leases Receivable Gross Carrying Amount		226,000	251,000
BVI \| Loan with BVI government
Commitments and Contingencies Disclosure
Loans And Leases Receivable Gross Carrying Amount			19,000
Insured or guaranteed by the U.S. Government or its agencies \| Commercial Loans
Commitments and Contingencies Disclosure
Loans And Leases Receivable Gross Carrying Amount		65,000	60,000
PR Government direct exposure
Commitments and Contingencies Disclosure
Outstanding concentration of risk		345,783	377,000
Total concentration of risk		364,840
Principal payments received	$ 32,000
PR Government direct exposure \| Loans
Commitments and Contingencies Disclosure
Outstanding concentration of risk		315,590	342,000
PR Government direct exposure \| Securities Investment
Commitments and Contingencies Disclosure
Outstanding concentration of risk		30,193	35,000
PR Government Indirect Exposure
Commitments and Contingencies Disclosure
Outstanding concentration of risk		284,000	317,000
Loans and Leases Receivable, Consumer, Mortgage with PRHA		240,000	260,000
PR Government Indirect Exposure \| PR Housing Bonds backed by second mortgage loans
Commitments and Contingencies Disclosure
Outstanding concentration of risk		44,000	46,000
USVI Government Direct Exposure \| From USVI Government And Public Corporations
Commitments and Contingencies Disclosure
Total concentration of risk		$ 72,000	$ 105,000