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Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2013
Accounting Policies [Abstract]
More-likely-than-not-threshold percentage	50.00%

X

- Definition

More-likely-than-not threshold percentage.

+ References

No definition available.

+ Details

Name:	asrv_MoreLikelyThanNotThresholdPercentage
Namespace Prefix:	asrv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration