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NON-PERFORMING ASSETS INCLUDING TROUBLED DEBT RESTRUCTURINGS (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Interest Income
Interest income due in accordance with original terms	$ 103	$ 118	$ 94
Interest income recorded	(75)	0	0
Net reduction in interest income	$ 28	$ 118	$ 94

X

- Definition

Interest income recorded for nonaccrual loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Net reduction in interest income

+ References

No definition available.

+ Details

Name:	asrv_NetReductionInInterestIncome
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The gross interest income that would have been recorded in the period on troubled debt restructurings, if the loans had been current in accordance with their original terms and had been outstanding throughout the period or since origination, if held for part of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554

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