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EMPLOYEE BENEFIT PLANS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]      
Number of consecutive years of service and average annual compensation on which benefits are based 5 years    
Period of employment considered for benefit payments 10 years    
Change in benefit obligation:      
Benefit obligation at beginning of year $ 18,186us-gaap_DefinedBenefitPlanBenefitObligation $ 19,073us-gaap_DefinedBenefitPlanBenefitObligation  
Service cost 484us-gaap_DefinedBenefitPlanServiceCost 574us-gaap_DefinedBenefitPlanServiceCost  
Interest cost 859us-gaap_DefinedBenefitPlanInterestCost 770us-gaap_DefinedBenefitPlanInterestCost 746us-gaap_DefinedBenefitPlanInterestCost
Actuarial loss 277us-gaap_DefinedBenefitPlanActuarialGainLoss 449us-gaap_DefinedBenefitPlanActuarialGainLoss  
Benefits paid (1,660)us-gaap_DefinedBenefitPlanBenefitsPaid (535)us-gaap_DefinedBenefitPlanBenefitsPaid  
Other, change in actuarial assumptions (5,304)us-gaap_DefinedBenefitPlanOtherChanges 2,145us-gaap_DefinedBenefitPlanOtherChanges  
Benefit obligation at end of year 23,450us-gaap_DefinedBenefitPlanBenefitObligation 18,186us-gaap_DefinedBenefitPlanBenefitObligation 19,073us-gaap_DefinedBenefitPlanBenefitObligation
Change in plan assets:      
Fair value of plan assets at beginning of year 14,258us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 12,078us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
Actual return on plan assets 487us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 1,934us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets  
Employer contribution 850us-gaap_DefinedBenefitPlanContributionsByEmployer 840us-gaap_DefinedBenefitPlanContributionsByEmployer  
Benefits paid (1,736)pwod_DefinedBenefitPlanChangeInFairValueOfPlanAssetsBenefitsPaid (599)pwod_DefinedBenefitPlanChangeInFairValueOfPlanAssetsBenefitsPaid  
Adjustment to fair value of plan assets 47us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease 5us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease  
Fair value of plan assets at end of year 13,906us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 14,258us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 12,078us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Funded status (9,544)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (3,928)us-gaap_DefinedBenefitPlanFundedStatusOfPlan  
Accounts recognized on balance sheet as:      
Total liabilities (9,544)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent (3,928)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent  
Amounts recognized in accumulated other comprehensive income (loss) consist of:      
Net loss 6,965us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax 4,128us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax  
Accumulated benefit obligation 20,296us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation 15,866us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Components of Net Periodic Cost and Other Amounts Recognized in other Comprehensive Income, Net periodic pension cost:      
Service cost 560pwod_DefinedBenefitPlanServiceAndAdditionalCosts 638pwod_DefinedBenefitPlanServiceAndAdditionalCosts 624pwod_DefinedBenefitPlanServiceAndAdditionalCosts
Interest cost 859us-gaap_DefinedBenefitPlanInterestCost 770us-gaap_DefinedBenefitPlanInterestCost 746us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (1,153)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (985)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (820)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of transition asset 0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets 0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets (2)us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
Amortization of prior service cost 0us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit 25us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit 25us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Amortization of unrecognized net loss 209us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 479us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 436us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net periodic benefit cost $ 475us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 927us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 1,009us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 3.83%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Rate of compensation increase (as a percent) 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
Weighted-average assumptions used to determine net periodic cost      
Discount rate (as a percent) 4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Expected long-term return on plan assets (as a percent) 8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Rate of compensation increase (as a percent) 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease