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Derivative Hedging Instruments - Additional Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
Derivative Hedging Instruments
Derivative Maximum Notional Amount Outstanding	$ 500

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- Definition

Aggregate a total maximum notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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