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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 | $ 4,859 orrf_FairValueEstimate / us-gaap_FairValueByAssetClassAxis = orrf_ImpairedLoansNetMember | $ 4,951 orrf_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 | $ 786 orrf_FairValueEstimate / us-gaap_FairValueByAssetClassAxis = orrf_ForeclosedRealEstateMember | $ 558 orrf_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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- 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 -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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