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INCOME TAXES - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 677orrf_ProvisionForIncomeTaxesRelatedToNetSecurityGains	$ 116orrf_ProvisionForIncomeTaxesRelatedToNetSecurityGains	$ 1,688orrf_ProvisionForIncomeTaxesRelatedToNetSecurityGains
Charitable contribution, expiry period	2019
Low-income housing, expiry period	2034
Net operating loss carryforwards, expiry period	2032

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- Definition

Deferred Tax Assets Charitable Contribution Carryforwards Expiration Period

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- Definition

Deferred Tax Assets Low Income Housing Credit Carryforward Expiration Period

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- Definition

Deferred Tax Assets Operating Loss Carryforwards Expiration Period

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- Definition

Provision for income taxes related to net security gains.

+ References

No definition available.

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