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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 535orrf_ProvisionForIncomeTaxesRelatedToNetSecurityGains	$ 209orrf_ProvisionForIncomeTaxesRelatedToNetSecurityGains
Charitable contribution, expiry period	2020
Low-income housing, expiry period	2035
Net operating loss carryforwards, expiry period	2032

X

- Definition

Deferred Tax Assets Charitable Contribution Carryforwards Expiration Period

+ References

No definition available.

+ Details

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

X

- Definition

Deferred Tax Assets Low Income Housing Credit Carryforward Expiration Period

+ References

No definition available.

+ Details

Name:	orrf_DeferredTaxAssetsLowIncomeHousingCreditCarryforwardExpirationPeriod
Namespace Prefix:	orrf_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Deferred Tax Assets Operating Loss Carryforwards Expiration Period

+ References

No definition available.

+ Details

Name:	orrf_DeferredTaxAssetsOperatingLossCarryforwardsExpirationPeriod
Namespace Prefix:	orrf_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Provision for income taxes related to net security gains.

+ References

No definition available.

+ Details

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

X

- Details

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