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SHARE BASED COMPENSATION PLANS - Summary of Outstanding Stock Options (Detail) (2011 Incentive Stock Plan [Member], Employee Stock Option [Member], USD $)
12 Months Ended
Dec. 31, 2014
2011 Incentive Stock Plan [Member] | Employee Stock Option [Member]
 
Stock Options (Number of Shares)  
Outstanding at beginning of year 206,063us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Forfeited (22,706)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Expired (35,164)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Options outstanding and exercisable, at year end 148,193us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Stock Options, Weighted Average Exercise Price (usd per share)  
Outstanding at beginning of year $ 32.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Forfeited $ 31.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Expired $ 37.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Options outstanding and exercisable, at year end $ 31.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember