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Derivative Activities (Narratives) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) $ 2,322,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss $ 6,758,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss $ (7,702,000)us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
Notional Amount Purchased Option 10,700,000ofg_NotionalAmountPurchasedOption 28,000,000ofg_NotionalAmountPurchasedOption  
Embedded Derivative, Fair Value of Embedded Derivative Liability 5,500,000us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability 15,700,000us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability  
Notional Amount Embedded Option 10,500,000ofg_NotionalAmountEmbeddedOption 26,900,000ofg_NotionalAmountEmbeddedOption  
Interest Rate Cap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 110,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember		 94,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember		  
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) $ 8,600,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember