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LONG-TERM DEBT - Summary of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
FHLB fixed rate advances maturing amount, weighted average rate	1.84%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate	2.40%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate
Total FHLB Advances	$ 14,812us-gaap_AdvancesFromFederalHomeLoanBanks	$ 16,077us-gaap_AdvancesFromFederalHomeLoanBanks
FHLB Fixed Rate Advances Maturing [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
FHLB fixed rate advances maturing amount, 2014	0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateUnderOneYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember	10,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateUnderOneYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember
Federal home loan bank advances branch of FHLB bank weighted average interest rate, 2014	0.00%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearOne / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember	0.87%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearOne / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember
FHLB fixed rate advances maturing amount, 2015	10,000orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateUnderTwoYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember	0orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateUnderTwoYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember
Federal home loan bank advances branch of FHLB bank weighted average interest rate, 2015	0.35%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearTwo / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember	0.00%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearTwo / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember
FHLB fixed rate advances maturing amount, 2020	350orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateUnderNineYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember	350orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateUnderNineYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember
Federal home loan bank advances branch of FHLB bank weighted average interest rate, 2020	7.40%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearFour / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember	7.40%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearFour / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember
FHLB fixed rate advances maturing amount, Total	10,350us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember	10,350us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember
FHLB fixed rate advances maturing amount, weighted average rate	0.59%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember	1.09%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = orrf_FhlbFixedRateAdvanceMaturingMember
FHLB Amortizing Advance Requiring Monthly Principal and Interest Payments, Maturing [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
FHLB fixed rate advances maturing amount, weighted average rate	4.74%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember	4.76%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember
FHLB amortizing advance requiring monthly principal and interest payments, maturing amount, 2014	0orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByAmortizationUnderThreeYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember	963orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByAmortizationUnderThreeYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember
FHLB amortizing advance requiring monthly principal and interest payments, weighted average interest rate, 2014	0.00%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearThree / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember	4.86%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearThree / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember
FHLB amortizing advance requiring monthly principal and interest payments, maturing amount, 2025	4,462orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByAmortizationUnderFourteenYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember	4,764orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByAmortizationUnderFourteenYear / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember
FHLB amortizing advance requiring monthly principal and interest payments, weighted average interest rate, 2025	4.74%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearFive / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember	4.74%orrf_FederalHomeLoanBankAdvancesBranchOfFhlbBankWeightedAverageInterestRateYearFive / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember
FHLB amortizing advance requiring monthly principal and interest payments, maturing amount, Total	$ 4,462orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByAmortization / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember	$ 5,727orrf_FederalHomeLoanBankAdvancesMaturitiesSummaryByAmortization / us-gaap_LongtermDebtTypeAxis = orrf_FhlbAmortizingAdvanceRequiringMonthlyPrincipalAndInterestPaymentsMaturingMember

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Federal home loan bank advances branch of FHLB bank weighted average interest rate year one.

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Federal home loan bank advances maturities summary by amortization.

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

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Describes the weighted average interest rate applicable to the specific advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Amount of Federal Home Loan Bank (FHLB) advances which have fixed interest.

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