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Pension Benefits (Narrative) (Details) (Pension Plans, Defined Benefit [Member]) | 3 Months Ended
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Mar. 31, 2015
Pension Plans, Defined Benefit [Member] |
Pension Benefits [Line Items] |
Minimum number of annual hours | 1,000 asrv_DefinedBenefitPlanMinimumNumberOfAnnualEmployeeHours / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Vesting term | 5 years
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 10.00%asrv_DefinedBenefitPlanMaximumPercentOfAssetsComprisedOfEntityCommonStock / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember

X
- Definition Defined Benefit Plan, Maximum Percent Of Assets Comprised Of Entity Common Stock. + References No definition available. + Details
Name: | asrv_DefinedBenefitPlanMaximumPercentOfAssetsComprisedOfEntityCommonStock
Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined Benefit Plan, Minimum Number Of Annual Employee Hours. + References No definition available. + Details
Name: | asrv_DefinedBenefitPlanMinimumNumberOfAnnualEmployeeHours
Namespace Prefix: | asrv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Defined Benefit Plan, Vesting Period. + References No definition available. + Details
Name: | asrv_DefinedBenefitPlanVestingPeriod
Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | asrv_PensionBenefitsLineItems
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration