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INCOME TAXES - Reconciliation of Effective Applicable Income Tax Rate to Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory federal tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase/(decrease) resulting from:
State taxes, net of federal benefit	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	(1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax exempt interest income	(7.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(11.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	4.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Valuation allowance on deferred tax assets	(145.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(13.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(66.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Earnings from life insurance	(2.60%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance	(3.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance	1.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance
Disallowed interest	0.20%orrf_EffectiveIncomeTaxRateReconciliationDisallowedInterest	0.30%orrf_EffectiveIncomeTaxRateReconciliationDisallowedInterest	(0.10%)orrf_EffectiveIncomeTaxRateReconciliationDisallowedInterest
Low-income housing credits	(3.70%)orrf_EffectiveIncomeTaxRateReconciliationLowIncomeHousingCredits	(2.20%)orrf_EffectiveIncomeTaxRateReconciliationLowIncomeHousingCredits	0.00%orrf_EffectiveIncomeTaxRateReconciliationLowIncomeHousingCredits
Benefit of operating loss carryforward	0.00%orrf_EffectiveIncomeTaxRateReconciliationBenefitOfOperatingLossCarryforward	(3.80%)orrf_EffectiveIncomeTaxRateReconciliationBenefitOfOperatingLossCarryforward	0.00%orrf_EffectiveIncomeTaxRateReconciliationBenefitOfOperatingLossCarryforward
Other	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate	(124.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	(2.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	(26.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to life insurance expense.

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