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INTANGIBLE ASSETS (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill		$ 11,944,000us-gaap_Goodwill	$ 12,613,000us-gaap_Goodwill	$ 12,613,000us-gaap_Goodwill
Impairment charge	669,000us-gaap_GoodwillImpairmentLoss	669,000us-gaap_GoodwillImpairmentLoss
West Chester Capital Advisors [Member]
Goodwill [Line Items]
Goodwill		2,400,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = asrv_WestChesterCapitalAdvisorsMember
Retail Banking [Member]
Goodwill [Line Items]
Goodwill		$ 9,500,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asrv_RetailBankingMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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-Publisher FASB

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X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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