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Share Based Compensation Plans - Summary of Outstanding Nonvested Restricted Shares (Details) (Orrstown 2011 Incentive Stock Plan, Restricted Stock, USD $)
3 Months Ended
Mar. 31, 2015
Orrstown 2011 Incentive Stock Plan | Restricted Stock
 
Number of Restricted Shares  
Nonvested shares, beginning of year 155,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Granted 28,394us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Nonvested shares, at period end 183,894us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Restricted Shares, Weighted Average Grant Date Fair Value (usd per share)  
Nonvested shares, beginning of year $ 15.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Granted $ 17.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember
Nonvested shares, at period end $ 15.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= orrf_OrrstownFinancialServicesInc.2011IncentiveStockPlanMember