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DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS (Details Textual) | 12 Months Ended
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Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Assets And Liabilities Considered Financial Instruments Percentage | 90.00%

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- Definition Assets and liabilities considered financial instruments, percentage. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | num:percentItemType
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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration