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INCOME TAXES - Reconciliation of Effective Applicable Income Tax Rate to Federal Statutory Rate (Detail) | 12 Months Ended
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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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- Definition Effective income tax rate reconciliation low income housing credits. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition 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 changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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