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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Reserve for off-balance sheet credit exposures | $ 485 orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureLiability | $ 529 orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureLiability |
Charged to other noninterest expense | (44)orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureChargedToNoninterestExpense | (54)orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureChargedToNoninterestExpense | (199)orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureChargedToNoninterestExpense
Mortgage Partnership Finance Program [Member] |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Sum of total loans sold under the MPF Program | 51,773 orrf_SumOfLoansSoldUnderMortgagePartnershipFinanceProgram / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember | 61,862 orrf_SumOfLoansSoldUnderMortgagePartnershipFinanceProgram / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember |
Limited recourse debt | 8,508 orrf_LimitedRecourseDebt / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember | 8,508 orrf_LimitedRecourseDebt / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember |
Other expenses estimating losses | $ 71 orrf_OtherExpensesEstimatingLosses / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember | $ 20 orrf_OtherExpensesEstimatingLosses / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember | $ 22 orrf_OtherExpensesEstimatingLosses / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember

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- Definition Concentration risk credit risk financial instrument maximum exposure charged to noninterest expense. + References No definition available. + Details
Name: | orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureChargedToNoninterestExpense
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Concentration risk credit risk financial instrument maximum exposure liability. + References No definition available. + Details
Name: | orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureLiability
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Limited recourse debt. + References No definition available. + Details
Name: | orrf_LimitedRecourseDebt
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other expenses estimating losses. + References No definition available. + Details
Name: | orrf_OtherExpensesEstimatingLosses
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Sum total of loans sold under the mortgage partnership finance program. + References No definition available. + Details
Name: | orrf_SumOfLoansSoldUnderMortgagePartnershipFinanceProgram
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=orrf_MortgagePartnershipFinanceProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |