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Investment Securities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Investment [Line Items]
Gross investment gains		$ 62,000asrv_GainOnSaleOfSecurities
Gross investment losses		5,000asrv_LossOnSaleOfSecurities
Investment Securities:
Consolidated investment securities portfolio modified, years	2 years 2 months 19 days
Proceeds from sales of investment securities - available for sale		2,753,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Book value of securities available for sale and held to maturity	$ 106,810,000asrv_CarryingValueOfAvailableForSaleHeldToMaturityAndFederalHomeLoanBankBorrowings		$ 104,780,000asrv_CarryingValueOfAvailableForSaleHeldToMaturityAndFederalHomeLoanBankBorrowings
Positions considered temporarily impaired	29us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
Standard & Poor's, AAA Rating [Member]
Investment [Line Items]
Portfolio rated	83.50%asrv_PercentageOfInvestmentSecuritiesPortfolioRated / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember		84.10%asrv_PercentageOfInvestmentSecuritiesPortfolioRated / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember
Standard & Poor's, A Rating [Member]
Investment [Line Items]
Portfolio rated	4.00%asrv_PercentageOfInvestmentSecuritiesPortfolioRated / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember

X

- Definition

Carrying value of available for sale held to maturity and federal home loan bank.

+ References

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- Definition

Consolidated investment securities portfolio modified, years.

+ References

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- Definition

The gain realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

No definition available.

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- Definition

The loss realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

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- Definition

Percentage of investment securities portfolio rated.

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Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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