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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Mortgage Servicing Rights (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Accounting Policies [Abstract] |  |
Balance of mortgage servicing rights | $ 2,897 | $ 2,835

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- Definition Mortgage servicing rights fair value disclosure. + References No definition available. + Details
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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_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
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