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Derivative Hedging Instruments - Additional Information (Details) $ in Millions | Sep. 30, 2019 USD ($)
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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