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Disclosures about Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Disclosures about Fair Value Measurements [Abstract]
Carrying value of impaired loans	$ 1,017,000us-gaap_ImpairedFinancingReceivableRecordedInvestment	$ 989,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
Specific valuation allowance	502,000us-gaap_ImpairedFinancingReceivableRelatedAllowance	520,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
Net fair value of impaired loans	$ 515,000us-gaap_ReceivablesFairValueDisclosure	$ 469,000us-gaap_ReceivablesFairValueDisclosure
Assets and liabilities considered financial instruments, percentage	90.00%asrv_AssetsAndLiabilitiesConsideredFinancialInstrumentsPercentage

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Assets and liabilities considered financial instruments, percentage.

+ References

No definition available.

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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- Definition

Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3, 4

-Article 5

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