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Derivative Hedging Instruments - Additional Information (Details) $ in Millions	Mar. 31, 2021 USD ($)
Maximum amount outstanding	$ 500.0
Interest Rate Swap [Member] | Risk Participation Agreement [Member]
Notional amount	$ 2.7

X

- Definition

The Aggregate of Maximum notional amount that policy allows to be outstanding specified by the derivative(s). Expressed as an absolute value.

+ References

No definition available.

+ Details

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

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=asrv_RiskParticipationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: