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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Schedule of Financial Instruments With Off-balance Sheet Risk (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Fair Value Disclosures [Abstract] |  |
Off-balance sheet credit exposures expense (recovery) | $ 16 | $ (95)

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

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration