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Non-Performing Assets Including Troubled Debt Restructurings (TDR) - Additional information (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
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Non-Performing Assets Including Troubled Debt Restructurings (TDR) |  |
ALL reserve for TDR's | $ 85,000 | $ 92,000

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- Definition Allowance for loan and lease losses pertaining to troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Non performing assets including trouble debt restructurings. + References No definition available. + Details
Name: | asrv_NonperformingAssetsIncludingTroubledDebtRestructuringsAbstract
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration