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Guarantees (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Guarantee Obligations [Line Items]      
Qualitative And Quantitative Information Assets Or Liabilities For Transferors Continuing Involvement In Securitization Or Asset backed Financing Arrangement Principal Amounts Outstanding $ 67,800,000us-gaap_QualitativeAndQuantitativeInformationAssetsOrLiabilitiesForTransferorsContinuingInvolvementInSecuritizationOrAssetbackedFinancingArrangementPrincipalAmountsOutstanding $ 122,300,000us-gaap_QualitativeAndQuantitativeInformationAssetsOrLiabilitiesForTransferorsContinuingInvolvementInSecuritizationOrAssetbackedFinancingArrangementPrincipalAmountsOutstanding  
Repurchased GNMA 7,100,000ofg_RepurchasedLoan    
Repurchase loan subject to credit recourse (143,000)ofg_RepurchaseLoanSubjectToCreditRecourse (281,000)ofg_RepurchaseLoanSubjectToCreditRecourse (1,700,000)ofg_RepurchaseLoanSubjectToCreditRecourse
Gain (Loss) On GNMA Repurchased Loan Not Subject To Credit Recourse (2,500,000)ofg_GainLossOnRepurchaseLoanNotSubjectToCreditRecourse    
Funds Advanced To Investors Under Servicing Agreements 391,000ofg_FundsAdvancedToInvestorsUnderServicingAgreements 243,000ofg_FundsAdvancedToInvestorsUnderServicingAgreements  
Next Year Recourse Obligation Termination 42,100,000ofg_TwoYearsOrLessRecourseObligationTerminationAmount    
Percentage of Future Extinguished Recourse Obligation Terminated in Two Years Or Less 62.00%ofg_PercentageOfFutureExtinguishedRecourseObligationTerminatedInTwoYearsOrLess    
Serviced mortgage loans for third parties 1,200,000,000ofg_AmountOfServicedLoans    
Loan with recourse [Member]      
Guarantee Obligations [Line Items]      
Repurchase loan subject to credit recourse $ (10,700,000)ofg_RepurchaseLoanSubjectToCreditRecourse
/ us-gaap_GuaranteeObligationsByNatureAxis
= ofg_LoanWithRecourseMember