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RESTRICTIONS ON CASH AND DUE FROM BANKS - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) bank | Dec. 31, 2014 USD ($)
Cash and Cash Equivalents [Abstract] |  |
Deposit in number of banks | bank | 2 |
Average balances to be maintained on hand or with correspondent banks | $ | $ 1,265 | $ 600

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- Definition Average balances to be maintained on hand or with correspondent banks. + 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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- Definition Deposits In Number Of Banks + References No definition available. + Details
Name: | orrf_DepositsInNumberOfBanks
Namespace Prefix: | orrf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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