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Borrowings (Redemption Fund) (Details) - Redemption Fund [Member] $ in Thousands | Sep. 30, 2016 USD ($)
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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

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- 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: |