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Derivatives (Interest rate swap not designated as hedging instruments and their term) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Derivative [Line Items]
Notional derivative not designated as an hedging instrument.	$ 42,400
Derivatives Offered to Clients - 1 Month LIBOR [Member]
Derivative [Line Items]
Notional derivative not designated as an hedging instrument.	12,500
Mirror Image Derivatives - 1 Month LIBOR [Member]
Derivative [Line Items]
Notional derivative not designated as an hedging instrument.	12,500
Interest Rate Swap 1, 5.5050% [Member] | Derivatives Offered to Clients - 1 Month LIBOR [Member]
Derivative [Line Items]
Notional derivative not designated as an hedging instrument.	$ 12,500
Fixed rate	5.505%
Settlement Date	Apr. 11, 2009
Maturity Date	Apr. 11, 2019
Interest Rate Swap 2, 5.5050% [Member] | Mirror Image Derivatives - 1 Month LIBOR [Member]
Derivative [Line Items]
Notional derivative not designated as an hedging instrument.	$ 12,500
Fixed rate	5.505%
Settlement Date	Apr. 11, 2009
Maturity Date	Apr. 11, 2019

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The settlement date of an investment contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_InvestmentContractSettlementDate
Namespace Prefix:	invest_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TransactionTypeAxis=ofg_DerivativesOfferedToClientsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TransactionTypeAxis=ofg_MirrorImageDerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ofg_InterestRateSwap1FivePointFiveZeroFiveZeroPercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ofg_InterestRateSwap2FivePointFiveZeroFiveZeroPercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: