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v3.19.1

Pension Benefit (Details Textual) | Mar. 31, 2019 Hour
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Pension Benefits [Line Items] |
Minimum number of annual hours | 1,000
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 10.00%

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

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

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- Definition Pension benefits. + References No definition available. + Details
Name: | asrv_PensionBenefitsLineItems
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration