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SHAREHOLDERS’ EQUITY AND REGULATORY CAPITAL - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Jan. 08, 2013
Equity [Abstract]
Common stock, reserved (shares)	1,045,000orrf_CommonStockSharesReservedForIssuanceUnderPurchasePlan
Shares available to be issued	663,000orrf_SharesAvailableForIssuanceUnderStockPurchasePlan
Aggregate capital, amount		$ 80,000,000orrf_AuthorizedShareCapital

X

- Definition

Authorized Share Capital

+ References

No definition available.

+ Details

Name:	orrf_AuthorizedShareCapital
Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Common stock shares reserved for issuance under purchase plan.

+ References

No definition available.

+ Details

Name:	orrf_CommonStockSharesReservedForIssuanceUnderPurchasePlan
Namespace Prefix:	orrf_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Shares available for issuance under stock purchase plan.

+ References

No definition available.

+ Details

Name:	orrf_SharesAvailableForIssuanceUnderStockPurchasePlan
Namespace Prefix:	orrf_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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