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Fair Value (Qualitative information for assets and liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Minimum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Constant prepayment rate 4.16%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
5.78%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
8.51%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Constant prepayment rate 13.98%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
14.33%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
16.29%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Fair Value, Inputs, Level 3 [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Fair Value assets and liabilities measured on reccurring basis 5,555ofg_FairValueAssetsAndLiabilitiesMeasuredOnReccurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Fair Value, Inputs, Level 3 [Member] | Derivative asset (S&P Purchased Options) [Member] | Option Pricing Model Technique [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Valuation Technique Option pricing model    
Unobservable Input Implied option volatility Counterparty credit risk (based on 5-year credit default swap ("CDS") spread)    
Fair Value, Inputs, Level 3 [Member] | Derivative asset (S&P Purchased Options) [Member] | Option Pricing Model Technique [Member] | Minimum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Implied option volatility 28.36%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Counterparty credit risk (based on 5-year CDS spread) 53.85%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Fair Value, Inputs, Level 3 [Member] | Derivative asset (S&P Purchased Options) [Member] | Option Pricing Model Technique [Member] | Maximum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Implied option volatility 42.42%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Counterparty credit risk (based on 5-year CDS spread) 62.81%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Fair Value, Inputs, Level 3 [Member] | Servicing Assets [Member] | Cash Flow Valuation Technique [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Fair Value assets and liabilities measured on reccurring basis 13,992ofg_FairValueAssetsAndLiabilitiesMeasuredOnReccurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_ServicingAssetsMember
/ us-gaap_ValuationTechniqueAxis
= ofg_CashFlowValuationTechniqueMember
   
Valuation Technique Discounted cash flows    
Unobservable Input Constant prepayment rate Discount rate    
Fair Value, Inputs, Level 3 [Member] | Servicing Assets [Member] | Cash Flow Valuation Technique [Member] | Minimum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Constant prepayment rate 4.16%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_ServicingAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_CashFlowValuationTechniqueMember
   
Discount rate 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_ServicingAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_CashFlowValuationTechniqueMember
   
Fair Value, Inputs, Level 3 [Member] | Servicing Assets [Member] | Cash Flow Valuation Technique [Member] | Maximum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Constant prepayment rate 13.98%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_ServicingAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_CashFlowValuationTechniqueMember
   
Discount rate 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_ServicingAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_CashFlowValuationTechniqueMember
   
Fair Value, Inputs, Level 3 [Member] | Derivative liability (S&P Embedded Options) [Member] | Option Pricing Model Technique [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Fair Value assets and liabilities measured on reccurring basis (5,477)ofg_FairValueAssetsAndLiabilitiesMeasuredOnReccurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Valuation Technique Option pricing model    
Unobservable Input Implied option volatility Counterparty credit risk (based on 5-year CDS spread)    
Fair Value, Inputs, Level 3 [Member] | Derivative liability (S&P Embedded Options) [Member] | Option Pricing Model Technique [Member] | Minimum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Implied option volatility 28.36%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Counterparty credit risk (based on 5-year CDS spread) 53.85%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Fair Value, Inputs, Level 3 [Member] | Derivative liability (S&P Embedded Options) [Member] | Option Pricing Model Technique [Member] | Maximum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Implied option volatility 42.42%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Counterparty credit risk (based on 5-year CDS spread) 62.81%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_OptionPricingModelTechniqueMember
   
Fair Value, Inputs, Level 3 [Member] | Collateral dependant impaired loan | Fair value of property or collateral [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Fair Value assets and liabilities measured on reccurring basis 36,960ofg_FairValueAssetsAndLiabilitiesMeasuredOnReccurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Valuation Technique Fair value of property or collateral    
Unobservable Input Appraised value less disposition costs    
Fair Value, Inputs, Level 3 [Member] | Collateral dependant impaired loan | Fair value of property or collateral [Member] | Minimum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Appraised value 22.20%ofg_AppraisedValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Fair Value, Inputs, Level 3 [Member] | Collateral dependant impaired loan | Fair value of property or collateral [Member] | Maximum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Appraised value 27.20%ofg_AppraisedValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Fair Value, Inputs, Level 3 [Member] | Puerto Rico Electric Power Authority loan | Cash Flow Valuation Technique [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Fair Value assets and liabilities measured on reccurring basis 199,982ofg_FairValueAssetsAndLiabilitiesMeasuredOnReccurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_GovernmentInstitutionLoanMember
/ us-gaap_ValuationTechniqueAxis
= ofg_CashFlowValuationTechniqueMember
   
Fair Value, Inputs, Level 3 [Member] | Puerto Rico Electric Power Authority loan | Fair value of property or collateral [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Valuation Technique Discounted cash flows    
Unobservable Input Management's assumptions regarding reorganization    
Fair Value, Inputs, Level 3 [Member] | Puerto Rico Electric Power Authority loan | Fair value of property or collateral [Member] | Minimum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Appraised value 7.25%ofg_AppraisedValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_GovernmentInstitutionLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Fair Value, Inputs, Level 3 [Member] | Puerto Rico Electric Power Authority loan | Fair value of property or collateral [Member] | Maximum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Appraised value 7.25%ofg_AppraisedValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_GovernmentInstitutionLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Fair Value, Inputs, Level 3 [Member] | Foreclosed real estate [Member] | Fair value of property or collateral [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Fair Value assets and liabilities measured on reccurring basis 95,661ofg_FairValueAssetsAndLiabilitiesMeasuredOnReccurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_ForeclosedRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Valuation Technique Fair value of property or collateral    
Unobservable Input Appraised value less disposition costs    
Fair Value, Inputs, Level 3 [Member] | Foreclosed real estate [Member] | Fair value of property or collateral [Member] | Minimum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Appraised value 20.20%ofg_AppraisedValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_ForeclosedRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Fair Value, Inputs, Level 3 [Member] | Foreclosed real estate [Member] | Fair value of property or collateral [Member] | Maximum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Appraised value 27.20%ofg_AppraisedValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_ForeclosedRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Fair Value, Inputs, Level 3 [Member] | Other repossessed assets [Member] | Fair value of property or collateral [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Fair Value assets and liabilities measured on reccurring basis 21,800ofg_FairValueAssetsAndLiabilitiesMeasuredOnReccurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_OtherRepossessedAssetsMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Valuation Technique Fair value of property or collateral    
Unobservable Input Appraised value less disposition costs    
Fair Value, Inputs, Level 3 [Member] | Other repossessed assets [Member] | Fair value of property or collateral [Member] | Minimum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Appraised value 20.20%ofg_AppraisedValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_OtherRepossessedAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember
   
Fair Value, Inputs, Level 3 [Member] | Other repossessed assets [Member] | Fair value of property or collateral [Member] | Maximum [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Appraised value 27.20%ofg_AppraisedValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= ofg_OtherRepossessedAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= ofg_FairValueOfPropertyOrCollateralMember