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v3.21.2

Lease Commitments - Additional information (Details) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Short Term Equipment Under Lease [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Description Of Accounting Treatment For Short Term Operating Lease | As of September 30, 2021 and December 31, 2020, the Company had no short-term leases. | As of September 30, 2021 and December 31, 2020, the Company had no short-term leases.

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- Definition Description of treatment in the books of account for assets under short term operating leases. + References No definition available. + Details
Name: | asrv_DescriptionOfAccountingTreatmentForShortTermOperatingLease
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=asrv_ShortTermEquipmentUnderLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |