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Income taxes (Effective Income Tax Rate Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract      
Income Tax Reconciliation State And Local Income Taxes $ 47,749us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes $ 34,997us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes $ 8,357us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Income Tax Reconciliation Tax Exempt Income (10,002)us-gaap_IncomeTaxReconciliationTaxExemptIncome (4,652)us-gaap_IncomeTaxReconciliationTaxExemptIncome (3,461)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Income Tax Reconciliation Capital Loss Carryforward 0ofg_Incometaxreconciliationcapitallosscarryforward 840ofg_Incometaxreconciliationcapitallosscarryforward (4,361)ofg_Incometaxreconciliationcapitallosscarryforward
Income Tax Reconciliation Disallowed net operating loss carryover 8,289ofg_IncomeTaxReconciliationDisallowedNetOperatingLossCarryover 0ofg_IncomeTaxReconciliationDisallowedNetOperatingLossCarryover 0ofg_IncomeTaxReconciliationDisallowedNetOperatingLossCarryover
Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance (958)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 1,896us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (554)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income Tax Reconciliation Tax Contingencies (1,093)us-gaap_IncomeTaxReconciliationTaxContingencies (1,559)us-gaap_IncomeTaxReconciliationTaxContingencies 114us-gaap_IncomeTaxReconciliationTaxContingencies
Income Tax Reconciliation Change In Enacted Tax Rate 0us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate (38,068)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate 0us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Income Tax Loan Basis Change Effect (7,642)ofg_IncomeTaxLoanBasisChangeEffect 0ofg_IncomeTaxLoanBasisChangeEffect 0ofg_IncomeTaxLoanBasisChangeEffect
Effect Of Change In Tax Of Unit Segment 0ofg_Effectofchangeintaxofunitsegment 148ofg_Effectofchangeintaxofunitsegment 2,383ofg_Effectofchangeintaxofunitsegment
Income Tax Reconciliation Other Adjustments 909us-gaap_IncomeTaxReconciliationOtherAdjustments (2,311)us-gaap_IncomeTaxReconciliationOtherAdjustments 823us-gaap_IncomeTaxReconciliationOtherAdjustments
Total Income Tax Expense (Benefit) $ 37,252us-gaap_IncomeTaxExpenseBenefit $ (8,709)us-gaap_IncomeTaxExpenseBenefit $ 3,301us-gaap_IncomeTaxExpenseBenefit
EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract      
Tax at statutory rates 39.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 39.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 30.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax effect of exempt income, net (26.85%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (4.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (12.42%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Effective Income Tax Rate Reconciliation Capital Loss Carryforward 0.00%ofg_Effectiveincometaxratereconciliationcapitallosscarryforward 0.94%ofg_Effectiveincometaxratereconciliationcapitallosscarryforward (15.66%)ofg_Effectiveincometaxratereconciliationcapitallosscarryforward
Effective Income Tax Rate Disallowed Net Operating Loss Carryover 22.25%ofg_EffectiveIncomeTaxRateDisallowedNetOperatingLossCarryover 0.00%ofg_EffectiveIncomeTaxRateDisallowedNetOperatingLossCarryover 0.00%ofg_EffectiveIncomeTaxRateDisallowedNetOperatingLossCarryover
Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance (2.57%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 2.11%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (1.99%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation Tax Contingencies (2.94%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies (1.57%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 0.41%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Effect in deferred taxes due to increase or decrease in tax rates 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate (43.04%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Effective Income Tax Rate Loan Basis Change Effect (20.51%)ofg_EffectiveIncomeTaxRateLoanBasisChangeEffect 0.00%ofg_EffectiveIncomeTaxRateLoanBasisChangeEffect 0.00%ofg_EffectiveIncomeTaxRateLoanBasisChangeEffect
Effect of change in tax of IBE tax rate 0.00%ofg_Effectofchangeintaxofunitsegmenttaxrate 0.17%ofg_Effectofchangeintaxofunitsegmenttaxrate 8.55%ofg_Effectofchangeintaxofunitsegmenttaxrate
Other items, net 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (2.58%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 2.96%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total Income Tax Expense (Benefit) 10.82%us-gaap_EffectiveIncomeTaxRateContinuingOperations (9.70%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 11.85%us-gaap_EffectiveIncomeTaxRateContinuingOperations