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Commitments and Contingencies (Narratives) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Commitments and Contingencies [Abstract] |  |
Line of credit reserve | $ 2,700 | $ 627

X
- Definition Reserve for commitments to extend credit in case of future cash requirement. + References No definition available. + Details
Name: | ofg_LineOfCreditReserve
Namespace Prefix: | ofg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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