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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK - Commitments and Conditional Obligations (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revolving, Open Ended Home Equity Loans [Member]
Commitments and conditional obligations
Contract or Notional Amount	$ 100,897us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_RevolvingOpenEndedHomeEquityLoansMember	$ 86,253us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_RevolvingOpenEndedHomeEquityLoansMember
1-4 Family Residential Construction Loans [Member]
Commitments and conditional obligations
Contract or Notional Amount	2,463us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_OneToFourFamilyResidentialConstructionLoansMember	2,657us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_OneToFourFamilyResidentialConstructionLoansMember
Commercial Real Estate, Construction and Land Development Loans [Member]
Commitments and conditional obligations
Contract or Notional Amount	11,682us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_CommercialRealEstateConstructionAndLandDevelopmentLoansMember	2,961us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_CommercialRealEstateConstructionAndLandDevelopmentLoansMember
Commercial, Industrial and Other Loans [Member]
Commitments and conditional obligations
Contract or Notional Amount	71,483us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_CommercialIndustrialAndOtherLoansMember	45,629us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_CommercialIndustrialAndOtherLoansMember
Standby Letters of Credit [Member]
Commitments and conditional obligations
Contract or Notional Amount	$ 7,309us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember	$ 6,267us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember

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The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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