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Borrowings (Redemption Fund) (Details) - Redemption Fund [Member] $ in Thousands	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Redemption fund - June 30, 2016	$ 0
Total	$ 0

X

- Definition

Cumulative amount paid into a fund, which is used to retire the debt instrument.

+ References

No definition available.

+ Details

Name:	ofg_DebtInstrumentCumulativeSinkingFund
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Cumulative amounts of future obligation, which will be used to retire the debt instrument.

+ References

No definition available.

+ Details

Name:	ofg_DebtInstrumentCumulativeSinkingFundObligations
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ofg_RedemptionFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: