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Commitments and Contingencies (Summarized Credit-Related Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Commitments and Contingencies [Abstract] |  |
Commitments to extend credit | $ 1,050,333 | $ 853,148
Commercial letters of credit | 57 | 2,178
Standby letters of credit and financial guarantees | 16,225 | 47,251
Loans sold with recourse | $ 136,797 | $ 147,399

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- Definition Amount of the contingent obligation under letters of credit. + References No definition available. + Details
Name: | ofg_CommercialLettersCredit
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Loan commitments are legally binding commitments to extend credit to a counterparty under certain terms and conditions. + References No definition available. + Details
Name: | ofg_CommitmentsToExtendCredit
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to borrowers or third party investors for the origination of a loan. + References No definition available. + Details
Name: | ofg_LoansSoldWithRecourse
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration