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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	2orrf_DepositsInNumberOfBanks
Average balances to be maintained on hand or with correspondent banks	$ 600orrf_AverageBalancesToBeMaintainedOnHandOrWithCorrespondentBanks	$ 1,025orrf_AverageBalancesToBeMaintainedOnHandOrWithCorrespondentBanks

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

- Details

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