LOANS (Effect of Combined Modifications) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Commercial loans \| Commercial secured by real estate:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction			2.99%
Weighted-Average Term Extension (In months)			24 months
Weighted-Average Forgiveness/Forbearance of Principal Amount (In thousands)			$ 0
Commercial loans \| Other commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	1.99%		2.19%
Weighted-Average Term Extension (In months)	29 months		32 months
Weighted-Average Forgiveness/Forbearance of Principal Amount (In thousands)	$ 0		$ 0
Commercial loans \| Commercial US
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction		0.73%	2.15%	0.73%
Weighted-Average Term Extension (In months)		0 months	16 months	0 months
Weighted-Average Forgiveness/Forbearance of Principal Amount (In thousands)		$ 0	$ 5,309	$ 0
Mortgage loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	1.21%	0.00%	0.75%	0.38%
Weighted-Average Term Extension (In months)	158 months	193 months	135 months	185 months
Weighted-Average Forgiveness/Forbearance of Principal Amount (In thousands)	$ 27	$ 10,993	$ 33	$ 10,993
Personal loans \| Personal loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	4.18%		4.18%	5.00%
Weighted-Average Term Extension (In months)	40 months		40 months	18 months
Weighted-Average Forgiveness/Forbearance of Principal Amount (In thousands)	$ 0		$ 0	$ 0
Auto loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Interest Rate Reduction	1.38%		2.01%	3.00%
Weighted-Average Term Extension (In months)	37 months		35 months	0 months
Weighted-Average Forgiveness/Forbearance of Principal Amount (In thousands)	$ 0		$ 0	$ 0

Financing Receivable, Modified, Increase (Decrease) in Principal Forbearance And Principal Forgiveness, Amount From Modification

No definition available.

+ Details

Name:	ofg_FinancingReceivableModifiedIncreaseDecreaseInPrincipalForbearanceAndPrincipalForgivenessAmountFromModification
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-34

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-33

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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

- Definition

Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ofg_CommercialSecuredByRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ofg_OtherCommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ofg_UsLoanProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ofg_PersonalLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ofg_AutomobilePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: