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Allowance for Credit Losses - Loans - Amortized cost basis of collateral-dependent loans (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-dependent loans	$ 1,554
Other commercial real estate (non-owner occupied)
Financing Receivable, Allowance for Credit Loss [Line Items]
Collateral-dependent loans	$ 1,554

X

- Definition

Reflects the aggregate value of loans, trade receivables, securities and financial instruments that serve as collateral for obligations arising from a transfer of financial assets recorded as a secured borrowing.

+ References

No definition available.

+ Details

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

X

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=asrv_CommercialLoansSecuredByNonOwnerOccupiedOtherCommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: