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Loans Receivable (Recorded Investment in Covered Loan Pools) (Details) (USD $) In Thousands, unless otherwise specified							3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Covered Loan [Member]	Dec. 31, 2013 Covered Loan [Member]	Sep. 30, 2014 Loans Secured by 1-4 properties Covered Loan [Member]	Dec. 31, 2013 Loans Secured by 1-4 properties Covered Loan [Member]	Sep. 30, 2014 Construction and development secured by multi-family properties [Member] Covered Loan [Member]	Dec. 31, 2013 Construction and development secured by multi-family properties [Member] Covered Loan [Member]	Sep. 30, 2014 Other Commercial and Industrial[Member] Covered Loan [Member]	Dec. 31, 2013 Other Commercial and Industrial[Member] Covered Loan [Member]	Sep. 30, 2014 Consumer Loan [Member] Covered Loan [Member]	Dec. 31, 2013 Consumer Loan [Member] Covered Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal							$ 313,541	$ 338,257	$ 138,029	$ 52,142	$ 61,562	$ 66,037	$ 105,542	$ 209,566	$ 8,408	$ 10,512
Recorded Investment							205,340	173,286	106,823	38,179	20,249	17,304	73,424	111,946	4,844	5,857
Allowance for loan and lease losses, covered	$ 62,227	$ 59,515	$ 52,729	$ 56,555	$ 53,992	$ 54,124	$ 62,227	$ 52,729	$ 15,252	$ 12,495	$ 8,679	$ 6,866	$ 37,907	$ 32,753	$ 389	$ 615
Coverage							30.00%	30.00%	14.00%	33.00%	43.00%	40.00%	52.00%	29.00%	8.00%	11.00%

X

- Definition

The percentage represents the coverage of the allowance for loan and lease losses to loans.

+ References

No definition available.

+ Details

Name:	ofg_AllowanceToLoansCoverage
Namespace Prefix:	ofg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

+ Details

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

X

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

+ Details

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

X

- Definition

Amount of allowance for loan and lease losses covered by loss sharing agreements.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableAllowanceCovered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant