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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans (Details)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Maturity of interest bearing deposits	90 days
Evaluation period to return non accrual TDRs to accrual status	6 months

X

- Definition

Evaluation Period To Return Past Due Loans To Accrual Status

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No definition available.

+ Details

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- Definition

Maturity of interest bearing deposits.

+ References

No definition available.

+ Details

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Namespace Prefix:	orrf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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