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Income Taxes - Components of Net Deferred Tax Asset (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Allowance for loan losses $ 5,284us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 5,424us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Deferred compensation 530us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 528us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Retirement plans and salary continuation 1,724orrf_DeferredTaxAssetsRetirementPlansAndSalaryContinuation 1,695orrf_DeferredTaxAssetsRetirementPlansAndSalaryContinuation
Share-based compensation 147us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 102us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Off balance sheet reserves 195orrf_DeferredTaxAssetsOffBalanceSheetReserves 205orrf_DeferredTaxAssetsOffBalanceSheetReserves
Nonaccrual loan interest 351orrf_DeferredTaxAssetsNonaccrualLoanInterest 210orrf_DeferredTaxAssetsNonaccrualLoanInterest
Goodwill 146us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 154us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Bonus Accrual 210us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses 396us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses
Low income housing credit carryforward 1,405orrf_DeferredTaxAssetsLowIncomeHousingCreditCarryForward 1,322orrf_DeferredTaxAssetsLowIncomeHousingCreditCarryForward
Alternative minimum tax credit carryforward 1,331us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 1,291us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Charitable contribution carryforward 188us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards 209us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards
Net operating loss carryforward 5,829us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 6,606us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 228us-gaap_DeferredTaxAssetsOther 237us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 17,568us-gaap_DeferredTaxAssetsGross 18,379us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Depreciation 888us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 955us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net unrealized gains on securities available for sale 1,896orrf_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecuritiesGross 848orrf_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecuritiesGross
Mortgage servicing rights 606us-gaap_DeferredTaxLiabilitiesMortgageServicingRights 606us-gaap_DeferredTaxLiabilitiesMortgageServicingRights
Purchase accounting adjustments 402orrf_DeferredTaxLiabilitiesPurchaseAccountingAdjustments 421orrf_DeferredTaxLiabilitiesPurchaseAccountingAdjustments
Other 175us-gaap_DeferredTaxLiabilitiesOther 174us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 3,967us-gaap_DeferredIncomeTaxLiabilities 3,004us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset $ 13,601us-gaap_DeferredTaxAssetsLiabilitiesNet $ 15,375us-gaap_DeferredTaxAssetsLiabilitiesNet