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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Number of Loans Modified and Their Pre-modification and Post-modification Investment Balances (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Contract	Dec. 31, 2013 Contract	Dec. 31, 2012 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	20orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts	9orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts	2orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts
Pre- Modification Investment Balance	$ 1,912us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	$ 5,176us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	$ 336us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post- Modification Investment Balance	1,824us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	5,158us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	336us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialMember
Pre- Modification Investment Balance		217us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialMember
Post- Modification Investment Balance		199us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialMember
Residential Mortgage [Member] | First Lien [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	19orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember		1orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Pre- Modification Investment Balance	1,876us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember		300us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Post- Modification Investment Balance	1,810us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember		300us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			1orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Pre- Modification Investment Balance			36us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Post- Modification Investment Balance			36us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Installment and Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Pre- Modification Investment Balance	36us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Post- Modification Investment Balance	14us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		4orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Pre- Modification Investment Balance		421us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Post- Modification Investment Balance		421us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate [Member] | Non-owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		2orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Pre- Modification Investment Balance		3,457us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Post- Modification Investment Balance		3,457us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Acquisition and Development [Member] | Commercial and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		2orrf_FinancingReceivablesModificationsDuringPeriodNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember
Pre- Modification Investment Balance		1,081us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember
Post- Modification Investment Balance		$ 1,081us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

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