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Allowance for Credit Losses - Loans - Loan modifications to borrowers experiencing financial difficulty (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	$ 439
Unfunded loan	0
Modified to borrowers which subsequently defaulted	0
Other commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	$ 439
Percentage of Total Class of Loans	0.29%
Term extension	5 months

X

- Definition

Extension date expiration term on non accrual line of credit.

+ References

No definition available.

+ Details

Name:	asrv_ExpirationDateExtensionTermOnNonAccrualLineOfCredit
Namespace Prefix:	asrv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Accumulated amortized cost excluding accrued interest, of financing receivable modified for debtor experiencing financial difficulty.

+ References

No definition available.

+ Details

Name:	asrv_FinancingReceivableExcludingAccruedInterestModifiedAccumulated
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

No definition available.

+ Details

Name:	asrv_FinancingReceivableExcludingAccruedInterestModifiedInPeriodToTotalFinancingReceivables
Namespace Prefix:	asrv_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of financing receivable excluding accrued interest relating subsequent default.

+ References

No definition available.

+ Details

Name:	asrv_FinancingReceivableExcludingAccruedInterestSubsequentDefault
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of financing receivable excluding accrued interest relating unfunded loan.

+ References

No definition available.

+ Details

Name:	asrv_FinancingReceivableExcludingAccruedInterestUnfundedLoan
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_OtherCommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: