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NON-PERFORMING ASSETS INCLUDING TROUBLED DEBT RESTRUCTURINGS - types of payment relief that have been granted (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 7,748	$ 49,063
Interest only payments
Financing Receivable, Modifications [Line Items]
Number of loans | loan	6	11
Loans For Which Payment Relief Has Been Requested	$ 3,768	$ 26,900
Complete payment deferrals
Financing Receivable, Modifications [Line Items]
Number of loans | loan	5	59
Loans For Which Payment Relief Has Been Requested	$ 3,980	$ 22,163
Maturity date extensions
Financing Receivable, Modifications [Line Items]
Number of loans | loan	11	70
Loans For Which Payment Relief Has Been Requested	$ 7,748	$ 49,063

X

- Definition

Number of financing receivables that have been modified in response to COVID-19.

+ References

No definition available.

+ Details

Name:	asrv_FinancingReceivableModificationsFromCovid19NumberOfContracts
Namespace Prefix:	asrv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of loans for which payment relief has been requested.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=asrv_InterestPaymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: