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

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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