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Loans (Aging of the Amortized Cost of Collateral-Dependent Loans Held For Investment) (Details) - Real Estate [Member] $ in Thousands	Dec. 31, 2020 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Amortized cost of collateral-dependent loans held for investment	$ 29,279
Commercial Portfolio Segment [Member] | Commercial Secured By Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Amortized cost of collateral-dependent loans held for investment	$ 29,279

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- Definition

Amortized Cost Of Collateral-Dependent Loans Held For Investment

+ References

No definition available.

+ Details

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Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- 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

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

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- Details

Name:	us-gaap_CollateralAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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

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- Details

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