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Derivative Hedging Instruments (Details Textual) $ in Millions | Jun. 30, 2018 USD ($)
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Derivative Notional Amount Outstanding | $ 500

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- Definition Aggregate notional amount 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