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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

X

- 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

X

- References

No definition available.

+ Details

Name:	asrv_RecordedInvestmentOfDefaultsAbstract
Namespace Prefix:	asrv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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