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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