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Derivative Activities (Interest rate swap not designated as hedging instruments and their term) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional derivative not designated as an hedging instrument.	$ 136,100	$ 109,800
Derivatives Offered to Clients - 1 Month LIBOR [Member] | Rate 5.51% [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
Mirror Image Derivatives - 1 Month LIBOR [Member] | Rate 5.51% [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

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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

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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

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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

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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

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ofg_DerivativeByInterestRateAxis=ofg_Rate551Member
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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