COMMITMENTS AND CONTINGENCIES (Credit-Related Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Other Commitments [Line Items]
Commitments to extend credit	$ 1,493,149	$ 1,377,419
Commercial letters of credit	74	231
Standby letters of credit and financial guarantees	25,918	26,051
Recourse
Other Commitments [Line Items]
Loans sold with recourse	$ 81,285	$ 83,014

Amount of the contingent obligation under letters of credit.

No definition available.

Name:	ofg_CommercialLettersCredit
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

An irrevocable undertaking (typically by a financial institution) to guarantee payment of a specified financial obligation.

+ References

No definition available.

+ Details

Name:	ofg_StandbyLettersOfCreditAndFinancialGuarantees
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

Name:	us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

+ Details

Name:	us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_RecourseStatusAxis=us-gaap_RecourseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: