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RESTRICTIONS ON CASH AND DUE FROM BANKS (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Cash and Cash Equivalents [Abstract] |  |
Average balances | $ 1,395 | $ 4,371

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- Definition Average balances to be maintained on hand or with correspondent banks. + References No definition available. + Details
Name: | orrf_AverageBalancesToBeMaintainedOnHandOrWithCorrespondentBanks
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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