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Securities Available for Sale - Gross Unrealized Losses and Fair Value of Company's Available for Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired securities, Less Than 12 Months, Fair Value	$ 47,519us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	$ 77,404us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses	146orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI	325orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI
Total temporarily impaired securities, 12 Months or More, Fair Value	23,421us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	74,814us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Total temporarily impaired securities, 12 Months or More, Unrealized Losses	430orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI	1,605orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI
Total temporarily impaired securities, Total, Fair Value	70,940us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	152,218us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Total temporarily impaired securities, Total, Unrealized Losses	576orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI	1,930orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI
U.S. Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired securities, Less Than 12 Months, Fair Value	10,726us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses	26orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	0orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Total temporarily impaired securities, 12 Months or More, Fair Value	3,546us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	9,012us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Total temporarily impaired securities, 12 Months or More, Unrealized Losses	3orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	23orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Total temporarily impaired securities, Total, Fair Value	14,272us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	9,012us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Total temporarily impaired securities, Total, Unrealized Losses	29orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	23orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired securities, Less Than 12 Months, Fair Value	8,834us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses	22orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	0orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Total temporarily impaired securities, 12 Months or More, Fair Value	14,426us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	35,833us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Total temporarily impaired securities, 12 Months or More, Unrealized Losses	371orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	996orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Total temporarily impaired securities, Total, Fair Value	23,260us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	35,833us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Total temporarily impaired securities, Total, Unrealized Losses	393orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	996orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
GSE residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired securities, Less Than 12 Months, Fair Value		65,474us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses		197orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Total temporarily impaired securities, 12 Months or More, Fair Value		0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Total temporarily impaired securities, 12 Months or More, Unrealized Losses		0orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Total temporarily impaired securities, Total, Fair Value		65,474us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Total temporarily impaired securities, Total, Unrealized Losses		197orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
GSE residential collateralized mortgage obligations (CMOs)
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired securities, Less Than 12 Months, Fair Value	3,321us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember	11,930us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses	29orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember	128orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, 12 Months or More, Fair Value	5,449us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, 12 Months or More, Unrealized Losses	56orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember	0orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, Total, Fair Value	8,770us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember	11,930us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, Total, Unrealized Losses	85orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember	128orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_ResidentialCollateralizedMortgageObligationsMember
GSE commercial CMOs
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired securities, Less Than 12 Months, Fair Value	24,638us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses	69orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember	0orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, 12 Months or More, Fair Value	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember	29,969us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, 12 Months or More, Unrealized Losses	0orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember	586orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, Total, Fair Value	24,638us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember	29,969us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember
Total temporarily impaired securities, Total, Unrealized Losses	$ 69orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember	$ 586orrf_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInAOCI / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = orrf_CommercialCollateralizedMortgageObligationsMember

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- Definition

Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer recognized in Accumulated Other Comprehensive Income (AOCI).

+ References

No definition available.

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Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale in Accumulated Other Comprehensive Income (AOCI).

+ References

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Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for less than twelve months recognized in Accumulated Other Comprehensive Income (AOCI).

+ References

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- Definition

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

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+ References

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+ References

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