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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Serviced (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Balance of loans serviced for others	$ 334,802	$ 328,701

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- Definition

Balance of loans serviced for others.

+ References

No definition available.

+ Details

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