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v3.19.1

Revenue Recognition (Details Textual) | 3 Months Ended
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Mar. 31, 2019
Revenue Associated With Financial Instruments [Member] |
Percentage Of Entity Revenue | 80.20%

X
- Definition Represents the percentage of entity revenue. + References No definition available. + Details
Name: | asrv_PercentageOfEntityRevenue
Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=asrv_RevenueAssociatedWithFinancialInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |