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Revenue Recognition - Additional information (Details) | 9 Months Ended
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Sep. 30, 2019
Revenue Associated With Financial Instruments [Member] |
Percentage Of Entity Revenue | 80.50%

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: |