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Commitments and Contingencies (Narratives) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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