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RESTRICTIONS ON CASH AND DUE FROM BANKS (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) bank | Dec. 31, 2015 USD ($)
Cash and Cash Equivalents [Abstract] |  |
Number of banks where deposit balances are maintained | bank | 2 |
Average balances | $ | $ 4,371 | $ 1,265

X
- 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

X
- 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

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