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DEPOSITS - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Deposits [Abstract] |  |
Brokered money market deposits | $ 45.1 | $ 8.1
Brokered time deposits | $ 50.6 | $ 0.0

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- Definition Deposits, Brokered Money Market Deposits + References No definition available. + Details
Name: | orrf_DepositsBrokeredMoneyMarketDeposits
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Time Deposit Brokered + References No definition available. + Details
Name: | orrf_TimeDepositBrokered
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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