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SHARE BASED COMPENSATION PLANS - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2011
2011 Incentive Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved to be issued       381,920us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Shares to be issued under the Plan 223,788us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
     
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved to be issued 350,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
     
Tax benefits from compensation expense 4,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
$ 39,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
$ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
 
Maximum percentage of shares purchase based on salary 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
     
Percentage of value of the shares on the semi-annual offering 95.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
     
Shares to be issued under employee stock purchase plan 198,643us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
     
Shares purchased by employees 6,707us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
21,609us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
23,062us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
 
Weighted average price 14.88us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
$ 11.52us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
$ 7.63us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
 
Compensation expense recognized 12,000us-gaap_StockOptionPlanExpense
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
112,000us-gaap_StockOptionPlanExpense
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
0us-gaap_StockOptionPlanExpense
/ us-gaap_PlanNameAxis
= orrf_EmployeeStockPurchasePlanMember
 
Restricted Stock [Member] | 2011 Incentive Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expense on Restricted stock awards 178,000us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
17,000us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
   
Tax benefits from compensation expense 62,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
6,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
   
Unrecognized compensation expense 1,982,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
35,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
   
Unrecognized compensation expense, recognition period 4 years 6 months      
Employee Stock Option [Member] | 2011 Incentive Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum term to exercise option 10 years      
Intrinsic value of Options exercised 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember