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Non-performing Assets Including Troubled Debt Restructurings (Recorded Investment of Defaults) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Recorded investment of defaults |  |
Recorded investment default, total | $ 1,320 | $ 32
Commercial loan secured by real estate [Member] |  |
Recorded investment of defaults |  |
Recorded investment default, total | $ 1,320 | $ 32

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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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- Details
Name: | asrv_RecordedInvestmentOfDefaults
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration