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Subsequent Events (Details) - Subsequent Event $ in Millions | Oct. 01, 2024 USD ($) subsidiary
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Subsequent Events |
Number of wholly owned subsidiaries | subsidiary | 2
AmeriServ Financial Bank | Financial Services Company |
Subsequent Events |
Assets and capital transferred | $ | $ 6.5

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- Definition Amount of assets and capital transferred as a result of merger. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents number of wholly owned subsidiaries of the company completed merger. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483399/855-10-50-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=asrv_AmeriservFinancialBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=asrv_FinancialServicesCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |