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SECURITIES AVAILABLE FOR SALE - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Security
Dec. 31, 2013
Security
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Securities held 37us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 77us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1  
Sales of available for sale securities $ 169,573us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 74,273us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 94,099us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross gains on the sales of securities 2,301us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 473us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 4,986us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross losses on securities available for sale 366us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 141us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 162us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Securities with fair value $ 261,034us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral $ 241,911us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral  
States and Political Subdivisions [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Securities held, less than 12 months category 16us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 31us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Unrealized loss for security more than 12 months less than 12 months  
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Securities held 21us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_InvestmentTypeAxis
= orrf_MortgageBackedSecuritiesIssuedByUsTreasuryAndUsGovernmentSponsoredEnterprisesMember		 46us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_InvestmentTypeAxis
= orrf_MortgageBackedSecuritiesIssuedByUsTreasuryAndUsGovernmentSponsoredEnterprisesMember		  
Securities held, less than 12 months category 13us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear
/ us-gaap_InvestmentTypeAxis
= orrf_MortgageBackedSecuritiesIssuedByUsTreasuryAndUsGovernmentSponsoredEnterprisesMember		 38us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear
/ us-gaap_InvestmentTypeAxis
= orrf_MortgageBackedSecuritiesIssuedByUsTreasuryAndUsGovernmentSponsoredEnterprisesMember		  
U.S Treasury and GSE, 12 months longer category 8us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear
/ us-gaap_InvestmentTypeAxis
= orrf_MortgageBackedSecuritiesIssuedByUsTreasuryAndUsGovernmentSponsoredEnterprisesMember		 8us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear
/ us-gaap_InvestmentTypeAxis
= orrf_MortgageBackedSecuritiesIssuedByUsTreasuryAndUsGovernmentSponsoredEnterprisesMember		  
Unrealized loss for security less than 12 months less than 12 months  
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member] | Maximum [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Unrealized loss for security more than 12 months