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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Reserve for off-balance sheet credit exposures | $ 345 |  | $ 345 |  | $ 529
Expense (recovery) through noninterest expense | (245) | 76 | (184) | (70) |
Mortgage Partnership Finance Program [Member] |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Sum of total loans sold under the MPF Program |  |  | 54,972 |  | 61,862
Limited recourse debt | 8,508 |  | 8,508 |  | 8,508
Charge (recovery) to other expenses | $ 162 | $ 76 | $ 131 | $ 20 |

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- Definition Concentration Risk Credit Risk Financial Instrument Maximum Exposure Charged (Recovery) To Noninterest Expense + References No definition available. + Details
Name: | orrf_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposureChargedRecoveryToNoninterestExpense
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 Mortgage Partnership Finance Program Recourse Liability Charges (Recoveries) + References No definition available. + Details
Name: | orrf_MortgagePartnershipFinanceProgramRecourseLiabilityChargesRecoveries
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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