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Loans - Additional information (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Loans
Accrued interest receivable	$ 4,000,000.0	$ 3,500,000
Real estate-construction loans, percentage	2.80%	4.70%
Loan balances net of unearned income	$ 401,000	$ 343,000

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- Definition

Real estate-construction loans, percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Carrying amount as of the balance sheet date of interest earned on loans but not received. Also called accrued interest or accrued interest receivable.

+ References

No definition available.

+ Details

Name:	asrv_ReceivableAccruedInterest
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amount of unamortized loan commitment, origination, and other costs (fees) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481598/310-20-45-1

Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-SubTopic 20
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481569/310-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Period Type:	duration