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

Average balances to be maintained on hand or with correspondent banks.

No definition available.

Name:	orrf_AverageBalancesToBeMaintainedOnHandOrWithCorrespondentBanks
Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant