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RESTRICTIONS ON CASH AND DUE FROM BANKS (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Abstract]
Average balances	$ 1,395	$ 4,371

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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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- References

No definition available.

+ Details

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