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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Restructured Loans Included in Nonaccrual Status Were Modified as Troubled Debt Restructurings within Previous 12 Months and for Which There was Payment Default (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]
Troubled debt restructurings at periods end, Number of Contracts	4orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne	1orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne	5orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne
Troubled debt restructurings at period end, Recorded Investment	$ 4,216orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne	$ 199orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne	$ 1,216orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings at periods end, Number of Contracts	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	1orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Troubled debt restructurings at period end, Recorded Investment	0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	7orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_OwnerOccupiedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate [Member] | Non-owner Occupied Residential [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings at periods end, Number of Contracts	1orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedResidentialMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedResidentialMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	4orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedResidentialMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Troubled debt restructurings at period end, Recorded Investment	3,495orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedResidentialMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedResidentialMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	1,209orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_NonOwnerOccupiedResidentialMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Acquisition and Development [Member] | Commercial and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings at periods end, Number of Contracts	1orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember
Troubled debt restructurings at period end, Recorded Investment	544orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_CommercialAndLandDevelopmentMember / us-gaap_StatementBusinessSegmentsAxis = orrf_AcquisitionAndDevelopmentPortfolioSegmentMember
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings at periods end, Number of Contracts	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_StatementBusinessSegmentsAxis = orrf_CommercialAndIndustrialPortfolioSegmentMember	1orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_StatementBusinessSegmentsAxis = orrf_CommercialAndIndustrialPortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_StatementBusinessSegmentsAxis = orrf_CommercialAndIndustrialPortfolioSegmentMember
Troubled debt restructurings at period end, Recorded Investment	0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_StatementBusinessSegmentsAxis = orrf_CommercialAndIndustrialPortfolioSegmentMember	199orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_StatementBusinessSegmentsAxis = orrf_CommercialAndIndustrialPortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_StatementBusinessSegmentsAxis = orrf_CommercialAndIndustrialPortfolioSegmentMember
Residential Mortgage [Member] | First Lien [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings at periods end, Number of Contracts	2orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember	0orrf_FinancingReceivableDefaultOfTermsNumberOfContractsOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Troubled debt restructurings at period end, Recorded Investment	$ 177orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember	$ 0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember	$ 0orrf_FinancingReceivableDefaultOfTermsPostModificationRecordedInvestmentOne / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember

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