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v3.8.0.1

SHORT-TERM BORROWINGS (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Short-term Debt [Line Items] |  |  |
Average maturity | 3 days | 3 days | 3 days

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- Definition Debt Instrument, Weighted Average Term. + References No definition available. + Details
Name: | asrv_ShortTermDebtInstrumentWeightedAverageTerm
Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration