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FAIR VALUE DISCLOSURES - Summary of Additional Qualitative Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Estimate	$ 4,859orrf_FairValueEstimate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember	$ 4,951orrf_FairValueEstimate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember
Valuation Techniques	Appraisal of collateral	Appraisal of collateral
Impaired Loans [Member] | Management Adjustments On Appraisals For Property Type And Recent Activity [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Unobservable Input	Management adjustments on appraisals for property type and recent activity	Management adjustments on appraisals for property type and recent activity
Impaired Loans [Member] | Management Adjustments For Liquidation Expenses [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Unobservable Input	Management adjustments for liquidation expenses	Management adjustments for liquidation expenses
Foreclosed Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Estimate	$ 786orrf_FairValueEstimate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember	$ 558orrf_FairValueEstimate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember
Valuation Techniques	Appraisal of collateral	Appraisal of collateral
Foreclosed Real Estate [Member] | Management Adjustments On Appraisals For Property Type And Recent Activity [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Unobservable Input	Management adjustments on appraisals for property type and recent activity	Management adjustments on appraisals for property type and recent activity
Foreclosed Real Estate [Member] | Management Adjustments For Liquidation Expenses [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Unobservable Input	Management adjustments for liquidation expenses	Management adjustments for liquidation expenses
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Minimum [Member] | Management Adjustments For Liquidation Expenses [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Inputs, Discount Rate	5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsForLiquidationExpensesMember	5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsForLiquidationExpensesMember
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Minimum [Member] | Appraisal of Collateral [Member] | Management Adjustments On Appraisals For Property Type And Recent Activity [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Inputs, Discount Rate	0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsOnAppraisalsForPropertyTypeAndRecentActivityMember / us-gaap_ValuationTechniqueAxis = orrf_AppraisalOfCollateralMember	0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsOnAppraisalsForPropertyTypeAndRecentActivityMember / us-gaap_ValuationTechniqueAxis = orrf_AppraisalOfCollateralMember
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Maximum [Member] | Management Adjustments For Liquidation Expenses [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Inputs, Discount Rate	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsForLiquidationExpensesMember	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsForLiquidationExpensesMember
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Maximum [Member] | Appraisal of Collateral [Member] | Management Adjustments On Appraisals For Property Type And Recent Activity [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Inputs, Discount Rate	30.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsOnAppraisalsForPropertyTypeAndRecentActivityMember / us-gaap_ValuationTechniqueAxis = orrf_AppraisalOfCollateralMember	30.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsOnAppraisalsForPropertyTypeAndRecentActivityMember / us-gaap_ValuationTechniqueAxis = orrf_AppraisalOfCollateralMember
Fair Value, Measurements, Nonrecurring [Member] | Foreclosed Real Estate [Member] | Minimum [Member] | Management Adjustments For Liquidation Expenses [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Inputs, Discount Rate	6.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsForLiquidationExpensesMember	5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsForLiquidationExpensesMember
Fair Value, Measurements, Nonrecurring [Member] | Foreclosed Real Estate [Member] | Minimum [Member] | Appraisal of Collateral [Member] | Management Adjustments On Appraisals For Property Type And Recent Activity [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Inputs, Discount Rate	0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsOnAppraisalsForPropertyTypeAndRecentActivityMember / us-gaap_ValuationTechniqueAxis = orrf_AppraisalOfCollateralMember	0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsOnAppraisalsForPropertyTypeAndRecentActivityMember / us-gaap_ValuationTechniqueAxis = orrf_AppraisalOfCollateralMember
Fair Value, Measurements, Nonrecurring [Member] | Foreclosed Real Estate [Member] | Maximum [Member] | Management Adjustments For Liquidation Expenses [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Inputs, Discount Rate	18.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsForLiquidationExpensesMember	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsForLiquidationExpensesMember
Fair Value, Measurements, Nonrecurring [Member] | Foreclosed Real Estate [Member] | Maximum [Member] | Appraisal of Collateral [Member] | Management Adjustments On Appraisals For Property Type And Recent Activity [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value Inputs, Discount Rate	5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsOnAppraisalsForPropertyTypeAndRecentActivityMember / us-gaap_ValuationTechniqueAxis = orrf_AppraisalOfCollateralMember	30.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember / orrf_UnobservableInputAdjustmentAxis = orrf_ManagementAdjustmentsOnAppraisalsForPropertyTypeAndRecentActivityMember / us-gaap_ValuationTechniqueAxis = orrf_AppraisalOfCollateralMember

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Fair value estimate presented for additional qualitative information about assets measured on a nonrecurring basis.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Section 50

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Description of the inputs and valuation technique(s) used to measure fair value.

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