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EMPLOYEE BENEFIT PLANS (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
PENSION PLANS:      
Estimated net loss that will be amortized from accumulated other comprehensive income (loss) $ 813,000us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss [1],[2] $ 683,000us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss [1],[2]  
401(k) PLAN:      
Contributions to charged to operations 387,000us-gaap_DefinedContributionPlanCostRecognized 327,000us-gaap_DefinedContributionPlanCostRecognized  
Employer match percentage   6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch 2.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Maximum percent of salary 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent 3.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent 1.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Contribution for union members 4.00%asrv_DefinedContributionPlanMaximumAnnualContributionPerUnionEmployeePercent 4.00%asrv_DefinedContributionPlanMaximumAnnualContributionPerUnionEmployeePercent 4.00%asrv_DefinedContributionPlanMaximumAnnualContributionPerUnionEmployeePercent
AmeriServ Financial, Inc. common stock and Trust Preferred securities held 1,100,000asrv_DefinedContributionPlanAmountOfEntityCommonStockAndSecuritiesHeld    
Pension Plans, Defined Benefit [Member]      
PENSION PLANS:      
Minimum number of annual hours 1,000asrv_DefinedBenefitPlanMinimumNumberOfAnnualEmployeeHours
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Vesting term 5 years    
AmeriServ Financial, Inc. common stock held 651,000us-gaap_DefinedBenefitPlanAmountOfEmployerAndRelatedPartySecuritiesIncludedInPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock 10.00%asrv_DefinedBenefitPlanMaximumPercentOfAssetsComprisedOfEntityCommonStock
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Percent of plan assets comprised of common stock 2.40%asrv_DefinedBenefitPlanPercentOfAssetsComprisedOfEntityCommonStock
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Estimated net loss that will be amortized from accumulated other comprehensive income (loss) 1,261,000us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Expected return on plan assets 8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Expected contribution in 2015 $ 2,500,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Pension Plans, Defined Benefit [Member] | Domestic Equities [Member]      
PENSION PLANS:      
Target allocation 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Target allocation, minimum 50.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Target allocation, maximum 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member]      
PENSION PLANS:      
Target allocation, minimum 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Target allocation, maximum 50.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
[1] Amounts in parentheses indicate credits.
[2] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 14 for additional details).