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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Segment Office | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Line Items] |  |  |
Number of offices in which the company operates throughout the country | 22 orrf_NumberOfOffices |  |
Impairment charge related to investment | $ 0 us-gaap_ImpairmentOfInvestments |  |
Held to maturity or trading securities | 0 orrf_HeldToMaturityOrTradingSecurities | 0 orrf_HeldToMaturityOrTradingSecurities |
Debt securities other than temporarily impaired | 0 orrf_DebtSecuritiesOtherThanTemporarilyImpaired | 0 orrf_DebtSecuritiesOtherThanTemporarilyImpaired | 0 orrf_DebtSecuritiesOtherThanTemporarilyImpaired
Maturity of interest bearing deposits | 90 days |  |
Balance of loans serviced for others | 315,239,000 orrf_BalanceOfLoansServicedForOthers | 322,653,000 orrf_BalanceOfLoansServicedForOthers |
Foreclosed real estate totaled | 932,000 us-gaap_RealEstateAcquiredThroughForeclosure | 987,000 us-gaap_RealEstateAcquiredThroughForeclosure |
Percentage of limited partner interest | 99.00%orrf_PercentageOfLimitedPartnerInterest |  |
Investment in real estate partnership | 3,629,000 orrf_InvestmentInRealEstatePartnership | 3,779,000 orrf_InvestmentInRealEstatePartnership |
Loss investment in real estate partnership | 150,000 us-gaap_RealEstatePartnershipInvestmentSubsidiariesNetIncomeLossBeforeTax | 361,000 us-gaap_RealEstatePartnershipInvestmentSubsidiariesNetIncomeLossBeforeTax | 349,000 us-gaap_RealEstatePartnershipInvestmentSubsidiariesNetIncomeLossBeforeTax
Recognition of federal tax credits | 475,000 orrf_RecognitionOfFederalTaxCredits | 475,000 orrf_RecognitionOfFederalTaxCredits | 475,000 orrf_RecognitionOfFederalTaxCredits
Advertising expense | 540,000 us-gaap_AdvertisingExpense | 489,000 us-gaap_AdvertisingExpense | 636,000 us-gaap_AdvertisingExpense
Percentage of deferred tax assets | 50.00%orrf_PercentageOfDeferredTaxAssets |  |
Accumulated other comprehensive income (loss), net of taxes | $ 1,576,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ (4,813,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Number of operating significant segment | 1 us-gaap_NumberOfOperatingSegments |  |
Customer Lists [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Finite lives of intangible assets | 15 years |  |
Deposit Premiums [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Finite lives of intangible assets | 10 years |  |
Minimum [Member] | Building and Improvements [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Plant and equipment, useful life | 10 years |  |
Minimum [Member] | Furniture and Equipment [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Plant and equipment, useful life | 3 years |  |
Maximum [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Cash and cash equivalents, original maturities | 90 days |  |
Maximum [Member] | Building and Improvements [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Plant and equipment, useful life | 40 years |  |
Maximum [Member] | Furniture and Equipment [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Plant and equipment, useful life | 15 years |  |

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