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RETIREMENT PLANS - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions charged | $ 357 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 311 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 315 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Deferred Compensation Arrangement [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Age to qualify for payment of retirement benefits | 65 years |  |
Estimated present value of future benefits to be paid | 125 orrf_DefinedBenefitPlanPresentValueFutureBenefitPayments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 133 orrf_DefinedBenefitPlanPresentValueFutureBenefitPayments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Total annual expense | 13 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 1 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 12 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Supplemental Discretionary Deferred Compensation Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total annual expense | 25 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 10 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 30 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Account balance of the trust | 1,385 orrf_AccountBalanceOfTrust / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 1,325 orrf_AccountBalanceOfTrust / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |
Supplemental Retirement and Salary Continuation Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated present value of future benefits to be paid | 4,844 orrf_DefinedBenefitPlanPresentValueFutureBenefitPayments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember | 4,527 orrf_DefinedBenefitPlanPresentValueFutureBenefitPayments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember |
Total annual expense | 575 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember | 549 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember | 566 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember
Number of defined benefit pension plans | 3 orrf_NumberOfDefinedBenefitPensionPlans / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember |  |
Life Insurance Coverage Post-retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated present value of future benefits to be paid | 670 orrf_DefinedBenefitPlanPresentValueFutureBenefitPayments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementLifeInsuranceMember | 566 orrf_DefinedBenefitPlanPresentValueFutureBenefitPayments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementLifeInsuranceMember |
Total annual expense | $ 104 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementLifeInsuranceMember | $ 42 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementLifeInsuranceMember | $ 43 orrf_DefinedBenefitPlanAmountExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_DefinedBenefitPostretirementLifeInsuranceMember

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- Definition Age to qualify for payment of retirement benefits under plan. + References No definition available. + Details
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- Definition Defined benefit plan amount expense. + References No definition available. + Details
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- Definition Defined benefit plan present value future benefit payments. + References No definition available. + Details
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- Definition Number of defined benefit pension plans. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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