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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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	$ 485orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureLiability	$ 529orrf_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	51,773orrf_SumOfLoansSoldUnderMortgagePartnershipFinanceProgram / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember	61,862orrf_SumOfLoansSoldUnderMortgagePartnershipFinanceProgram / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember
Limited recourse debt	8,508orrf_LimitedRecourseDebt / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember	8,508orrf_LimitedRecourseDebt / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember
Other expenses estimating losses	$ 71orrf_OtherExpensesEstimatingLosses / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember	$ 20orrf_OtherExpensesEstimatingLosses / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember	$ 22orrf_OtherExpensesEstimatingLosses / us-gaap_FinancialInstrumentAxis = orrf_MortgagePartnershipFinanceProgramMember

X

- Definition

Concentration risk credit risk financial instrument maximum exposure charged to noninterest expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Concentration risk credit risk financial instrument maximum exposure liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- 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

X

- Details

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

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Namespace Prefix:
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Balance Type:
Period Type: