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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Mortgage Servicing Rights (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Accounting Policies [Abstract] |  |
Balance of mortgage servicing rights | $ 3.7 | $ 4.0

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- Definition Mortgage servicing rights, net fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | orrf_
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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