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Borrowings (Repurchase Transaction Liability and Market Value of its Underlying Collateral) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability $ 977,816us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability $ 1,265,000us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
Assets Sold Under Agreements To Repurchase Interest Rate 2.89%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate  
Market value of underlying collateral of a repurchase agreement 1,088,525us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue 1,342,505us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 1,087,272us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ofg_FnmaAndFhlmcMember
1,234,833us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ofg_FnmaAndFhlmcMember
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 1,253us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
3,000us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Collateralized Mortgage Obligations [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 0us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CollateralizedMortgageObligationsMember
94,023us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CollateralizedMortgageObligationsMember
US Government-sponsored Enterprises Debt Securities [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 0us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
10,649us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities Sold under Agreements to Repurchase [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Interest Rate   2.41%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability   255,000us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ ofg_DebtDueDateAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Assets Sold Under Agreements To Repurchase Interest Rate   0.50%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate
/ ofg_DebtDueDateAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Market value of underlying collateral of a repurchase agreement   272,053us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days | FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement   216,201us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ofg_FnmaAndFhlmcMember
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement   0us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days | Collateralized Mortgage Obligations [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement   48,923us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
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/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CollateralizedMortgageObligationsMember
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days | US Government-sponsored Enterprises Debt Securities [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement   6,929us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_MaturityUpTo30DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities Sold under Agreements to Repurchase [Member] | Maturity 30 To 90 Days Member    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability 52,816us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ ofg_DebtDueDateAxis
= us-gaap_Maturity30To90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
 
Assets Sold Under Agreements To Repurchase Interest Rate 0.39%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate
/ ofg_DebtDueDateAxis
= us-gaap_Maturity30To90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
 
Market value of underlying collateral of a repurchase agreement 56,066us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_Maturity30To90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
 
Securities Sold under Agreements to Repurchase [Member] | Maturity 30 To 90 Days Member | FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 56,066us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_Maturity30To90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ofg_FnmaAndFhlmcMember
 
Securities Sold under Agreements to Repurchase [Member] | Maturity 30 To 90 Days Member | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 0us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_Maturity30To90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
 
Securities Sold under Agreements to Repurchase [Member] | Maturity 30 To 90 Days Member | Collateralized Mortgage Obligations [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 0us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_Maturity30To90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CollateralizedMortgageObligationsMember
 
Securities Sold under Agreements to Repurchase [Member] | Maturity 30 To 90 Days Member | US Government-sponsored Enterprises Debt Securities [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 0us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_Maturity30To90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
 
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days    
Assets Sold Under Agreements To Repurchase Line Items    
Assets Sold Under Agreements To Repurchase Repurchase Liability 925,000us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ ofg_DebtDueDateAxis
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1,010,000us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ ofg_DebtDueDateAxis
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/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Assets Sold Under Agreements To Repurchase Interest Rate 2.83%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate
/ ofg_DebtDueDateAxis
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/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
2.89%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate
/ ofg_DebtDueDateAxis
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/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Market value of underlying collateral of a repurchase agreement 1,032,459us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
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/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
1,070,452us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
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/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days | FNMA and FHLMC [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 1,031,206us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_MaturityOver90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ofg_FnmaAndFhlmcMember
1,018,632us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
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/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ofg_FnmaAndFhlmcMember
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 1,253us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
= us-gaap_MaturityOver90DaysMember
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
3,000us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
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= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
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= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days | Collateralized Mortgage Obligations [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement 0us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
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/ us-gaap_DebtInstrumentAxis
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45,100us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
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/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CollateralizedMortgageObligationsMember
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days | US Government-sponsored Enterprises Debt Securities [Member]    
Assets Sold Under Agreements To Repurchase Line Items    
Market value of underlying collateral of a repurchase agreement $ 0us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
/ ofg_DebtDueDateAxis
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= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
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$ 3,720us-gaap_AssetsSoldUnderAgreementsToRepurchaseMarketValue
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