Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ofg_PricerangefiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ofg_PricerangefourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ofg_PricerangeoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ofg_PricerangesevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ofg_PricerangesixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ofg_PricerangethreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=ofg_PricerangetwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Equity-Based Compensation (Summary of the range of exercise prices and the weighted average remaining contractual life of the options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Line Items
Number of Options Outstanding	888,571	908,118	922,593	786,704
Weighted Average Exercise Price outstanding	$ 14.12	$ 14.46	$ 14.50	$ 15.02
Weighted Average Contract Life Remaining	6 years
Number of Options Exercisable	394,237
Weighted Average Exercise Price	$ 14.22
Aggregated Intrinsic Value Outstanding	$ 2,252,167
Aggregate Intrinsic Value Exercisable	$ 956,938
Price Range One [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Line Items
Range of Exercise Prices - Lower Range	$ 5.63
Range of Exercise Prices -Upper Range	$ 8.45
Number of Options Outstanding	9,960
Weighted Average Exercise Price outstanding	$ 8.28
Weighted Average Contract Life Remaining	4 years 4 months
Number of Options Exercisable	9,960
Weighted Average Exercise Price	$ 8.28
Price Range Two [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Line Items
Range of Exercise Prices - Lower Range	$ 8.46
Range of Exercise Prices -Upper Range	$ 11.26
Number of Options Outstanding	1,000
Weighted Average Exercise Price outstanding	$ 10.29
Weighted Average Contract Life Remaining	2 years 7 months
Number of Options Exercisable	1,000
Weighted Average Exercise Price	$ 10.29
Price Range Three [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Line Items
Range of Exercise Prices - Lower Range	$ 11.27
Range of Exercise Prices -Upper Range	$ 14.08
Number of Options Outstanding	478,361
Weighted Average Exercise Price outstanding	$ 11.94
Weighted Average Contract Life Remaining	5 years 5 months
Number of Options Exercisable	291,227
Weighted Average Exercise Price	$ 12.02
Price Range Four [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Line Items
Range of Exercise Prices - Lower Range	$ 14.09
Range of Exercise Prices -Upper Range	$ 16.90
Number of Options Outstanding	347,200
Weighted Average Exercise Price outstanding	$ 15.34
Weighted Average Contract Life Remaining	7 years 8 months
Number of Options Exercisable	40,000
Weighted Average Exercise Price	$ 15.11
Price Range Five [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Line Items
Range of Exercise Prices - Lower Range	$ 19.72
Range of Exercise Prices -Upper Range	$ 22.53
Number of Options Outstanding	1,500
Weighted Average Exercise Price outstanding	$ 21.86
Weighted Average Contract Life Remaining	3 years 2 months
Number of Options Exercisable	1,500
Weighted Average Exercise Price	$ 21.86
Price Range Six [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Line Items
Range of Exercise Prices - Lower Range	$ 22.54
Range of Exercise Prices -Upper Range	$ 25.35
Number of Options Outstanding	4,700
Weighted Average Exercise Price outstanding	$ 24.13
Weighted Average Contract Life Remaining	0 years 1 month
Number of Options Exercisable	4,700
Weighted Average Exercise Price	$ 24.13
Price Range Seven [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Line Items
Range of Exercise Prices - Lower Range	$ 25.36
Range of Exercise Prices -Upper Range	$ 28.17
Number of Options Outstanding	45,850
Weighted Average Exercise Price outstanding	$ 27.55
Weighted Average Contract Life Remaining	0 years
Number of Options Exercisable	45,850
Weighted Average Exercise Price	$ 27.55