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Securities Purchased Under Agreements To Resell and Investment Securities (Gains and losses by category) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost $ 357,228ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost $ 558,063ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
Total Available for Sale Unrealized Loss 9,631ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal 20,714ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
Total Available for Sale Fair Value 347,597us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 537,348us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
12 months or more    
Available for sale - Amortized cost 278,320ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost 23,485ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost
Available for sale - Unrealized Loss 9,533ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments 5,718ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments
Available-for-sale, Fair Value 268,787us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 17,767us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Less than 12 months    
Available for sale - Amortized cost 78,908ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost 534,578ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
Available for sale - Unrealized Loss 98ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments 14,996ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
Available for sale - Fair Value 78,810us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 519,581us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Investment Securities, Continuous Unrealized Loss Position [Abstract]    
Total Securities - Amortized Cost 357,228ofg_ContinuousUnrealizedLossOnInvestmentAmortizedCost 558,063ofg_ContinuousUnrealizedLossOnInvestmentAmortizedCost
Total Securities - Unrealized Position 9,631ofg_ContinuousUnrealizedLossOnInvestmentSecuiritiesAggregateLosses 20,714ofg_ContinuousUnrealizedLossOnInvestmentSecuiritiesAggregateLosses
Total Securities - Fair Value 347,597ofg_InvestmentSecuritiesContinuousUnrealizedLossPositionFairValue 537,348ofg_InvestmentSecuritiesContinuousUnrealizedLossPositionFairValue
CMO's issued by us government sponsored agenciesat loss    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 159,100ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
185,220ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Total Available for Sale Unrealized Loss 3,153ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
6,814ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Total Available for Sale Fair Value 155,947us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
178,406us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
12 months or more    
Available for sale - Amortized cost 143,928ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
2,559ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Available for sale - Unrealized Loss 3,086ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
237ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Available-for-sale, Fair Value 140,842us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
2,322us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Less than 12 months    
Available for sale - Amortized cost 15,172ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
182,661ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Available for sale - Unrealized Loss 67ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
6,577ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Available for sale - Fair Value 15,105us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
176,084us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
FNMA and FHLMC [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 177,112ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
220,914ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
Total Available for Sale Unrealized Loss 1,203ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
6,669ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
Total Available for Sale Fair Value 175,909us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
214,244us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
12 months or more    
Available for sale - Amortized cost 113,376ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
 
Available for sale - Unrealized Loss 1,172ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
 
Available-for-sale, Fair Value 112,204us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
 
Less than 12 months    
Available for sale - Amortized cost 63,736ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
220,914ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
Available for sale - Unrealized Loss 31ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
6,669ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
Available for sale - Fair Value 63,705us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
214,244us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ofg_FnmaAndFhlmcMember
Obligation of Puerto Rico Government and political subdivisions [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 20,939ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
121,035ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Total Available for Sale Unrealized Loss 5,267ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
6,845ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Total Available for Sale Fair Value 15,672us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
114,190us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
12 months or more    
Available for sale - Amortized cost 20,939ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
20,845ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available for sale - Unrealized Loss 5,267ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
5,470ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale, Fair Value 15,672us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
15,375us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Less than 12 months    
Available for sale - Amortized cost   100,190ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available for sale - Unrealized Loss   1,375ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available for sale - Fair Value   98,815us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 77ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
203ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Total Available for Sale Unrealized Loss 8ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
24ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Total Available for Sale Fair Value 69us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
179us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
12 months or more    
Available for sale - Amortized cost 77ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
81ofg_AvailableforsalesecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Available for sale - Unrealized Loss 8ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
11ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Available-for-sale, Fair Value 69us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
70us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Less than 12 months    
Available for sale - Amortized cost   122ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Available for sale - Unrealized Loss   13ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Available for sale - Fair Value   109us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Obligation of US Government sponsored agencies at loss [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost   10,691ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total Available for Sale Unrealized Loss   42ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total Available for Sale Fair Value   10,649us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Less than 12 months    
Available for sale - Amortized cost   10,691ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Available for sale - Unrealized Loss   42ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Available for sale - Fair Value   10,649us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Other Debt Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost   20,000ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Total Available for Sale Unrealized Loss   320ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossTotal
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Total Available for Sale Fair Value   19,680us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Less than 12 months    
Available for sale - Amortized cost   20,000ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Available for sale - Unrealized Loss   320ofg_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Available for sale - Fair Value   $ 19,680us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember