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RESTRICTIONS ON CASH AND DUE FROM BANKS - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Bank | Dec. 31, 2013
Cash and Cash Equivalents [Abstract] |  |
Deposit in number of banks | 2 orrf_DepositsInNumberOfBanks |
Average balances to be maintained on hand or with correspondent banks | $ 600 orrf_AverageBalancesToBeMaintainedOnHandOrWithCorrespondentBanks | $ 1,025 orrf_AverageBalancesToBeMaintainedOnHandOrWithCorrespondentBanks

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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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- 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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- Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration