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Loans - Additional information (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Loans
Real estate-construction loans, percentage	3.20%	4.70%
Loan balances net of unearned income	$ 321,000	$ 343,000
Accrued interest receivable	$ 3,500,000	$ 3,500,000

X

- Definition

The amount of deferred income financing receivable excluding accrued interest.

+ References

No definition available.

+ Details

Name:	asrv_FinancingReceivableExcludingAccruedInterestDeferredIncome
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Real estate-construction loans, percentage.

+ References

No definition available.

+ Details

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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration