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Lease Commitments - Additional information (Details)	9 Months Ended	12 Months Ended
	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

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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

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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_PropertyPlantAndEquipmentByTypeAxis=asrv_ShortTermEquipmentUnderLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: