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FAIR VALUE - Schedule of Changes in Fair Value of OREO For Properties Held (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Changes in fair value of OREO still held	$ 11	$ 0	$ 11	$ 0

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- Definition

Other Real Estate, Foreclosed Assets, Valuation Adjustment

+ References

No definition available.

+ Details

Name:	orrf_OtherRealEstateForeclosedAssetsValuationAdjustment
Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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