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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