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Business Segments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Banking [Member]
Segment Reporting Information [Line Items]
Change in Assets reclassification	$ (1,190.0)ofg_ChangeinAssetsReclassification / us-gaap_StatementBusinessSegmentsAxis = ofg_BankingMember
Treasury [Member]
Segment Reporting Information [Line Items]
Change in Assets reclassification	(830.9)ofg_ChangeinAssetsReclassification / us-gaap_StatementBusinessSegmentsAxis = ofg_TreasuryMember
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Change in Assets reclassification	$ (358.8)ofg_ChangeinAssetsReclassification / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember

X

- Definition

Change in total segment assets due to an asset revision.

+ References

No definition available.

+ Details

Name:	ofg_ChangeinAssetsReclassification
Namespace Prefix:	ofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ofg_BankingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ofg_TreasuryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: