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NON-PERFORMING ASSETS INCLUDING TROUBLED DEBT RESTRUCTURINGS (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Recorded investment of defaults |  |  |
Commercial Loan Receivable Modifications Recorded Investment | $ 0 | $ 0 | $ 1,480
Commercial loan secured by real estate [Member] |  |  |
Recorded investment of defaults |  |  |
Commercial Loan Receivable Modifications Recorded Investment | $ 0 | $ 0 | $ 1,480

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- Definition Commercial loan receivable modifications, recorded investment. + References No definition available. + Details
Name: | asrv_CommercialLoanReceivableModificationsRecordedInvestment
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | asrv_RecordedInvestmentOfDefaultsAbstract
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |