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Lease Commitments - Additional information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Operating Leased Assets [Line Items] |  |  |  |
Operating Leases, Rent Expense |  | $ 102,000 |  | $ 318,000
Short Term Equipment Under Lease [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Description Of Accounting Treatment For Short Term Operating Lease | As of September 30, 2019, the Company had one short-term equipment lease which it has elected to not record on the Consolidated Balance Sheets. |  | As of September 30, 2019, the Company had one short-term equipment lease which it has elected to not record on the Consolidated Balance Sheets. |

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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 Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_OperatingLeasedAssetsLineItems
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: |