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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Reserve for off-balance sheet credit exposures $ 417orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureLiability   $ 485orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureLiability
Amount expensed to (recovered from) calculation of reserves based on historical loss experience (68)orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureChargedToNoninterestExpense (70)orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureChargedToNoninterestExpense  
Mortgage Partnership Finance Program      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Sum of total loans sold under the MPF Program 49,189orrf_SumOfLoansSoldUnderMortgagePartnershipFinanceProgram
/ us-gaap_FinancialInstrumentAxis
= orrf_MortgagePartnershipFinanceProgramMember		   51,773orrf_SumOfLoansSoldUnderMortgagePartnershipFinanceProgram
/ us-gaap_FinancialInstrumentAxis
= orrf_MortgagePartnershipFinanceProgramMember
Limited recourse debt 8,379orrf_LimitedRecourseDebt
/ us-gaap_FinancialInstrumentAxis
= orrf_MortgagePartnershipFinanceProgramMember		   8,379orrf_LimitedRecourseDebt
/ us-gaap_FinancialInstrumentAxis
= orrf_MortgagePartnershipFinanceProgramMember
Other expenses, loss estimate $ 40orrf_OtherExpensesEstimatingLosses
/ us-gaap_FinancialInstrumentAxis
= orrf_MortgagePartnershipFinanceProgramMember		 $ 17orrf_OtherExpensesEstimatingLosses
/ us-gaap_FinancialInstrumentAxis
= orrf_MortgagePartnershipFinanceProgramMember