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Financial Instruments with Off-Balance-Sheet Risk - Commitments and Conditional Obligations (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Revolving, open ended home equity loans
Commitments and conditional obligations
Contract or Notional Amount	$ 105,791us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_RevolvingOpenEndedHomeEquityLoansMember	$ 100,897us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_RevolvingOpenEndedHomeEquityLoansMember
1-4 family residential construction loans
Commitments and conditional obligations
Contract or Notional Amount	4,751us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_OneToFourFamilyResidentialConstructionLoansMember	2,463us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_OneToFourFamilyResidentialConstructionLoansMember
Commercial real estate, construction and land development loans
Commitments and conditional obligations
Contract or Notional Amount	13,432us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_CommercialRealEstateConstructionAndLandDevelopmentLoansMember	11,682us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_CommercialRealEstateConstructionAndLandDevelopmentLoansMember
Commercial, industrial and other loans
Commitments and conditional obligations
Contract or Notional Amount	68,508us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_CommercialIndustrialAndOtherLoansMember	71,483us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = orrf_CommercialIndustrialAndOtherLoansMember
Standby letters of credit
Commitments and conditional obligations
Contract or Notional Amount	$ 6,888us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember	$ 7,309us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember

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- Definition

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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