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Significant Event (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Extraordinary And Unusual Items Abstract
Special provision due to significant event	$ 27.0

X

- Definition

Additional provision placed due to a significant event (hurricane).

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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