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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 |  | $ 62,000 asrv_GainOnSaleOfSecurities |
Gross investment losses |  | 5,000 asrv_LossOnSaleOfSecurities |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 2 years 2 months 19 days |  |
Proceeds from sales of investment securities - available for sale |  | 2,753,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities |
Book value of securities available for sale and held to maturity | $ 106,810,000 asrv_CarryingValueOfAvailableForSaleHeldToMaturityAndFederalHomeLoanBankBorrowings |  | $ 104,780,000 asrv_CarryingValueOfAvailableForSaleHeldToMaturityAndFederalHomeLoanBankBorrowings
Positions considered temporarily impaired | 29 us-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 |  |

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- Definition Carrying value of available for sale held to maturity and federal home loan bank. + References No definition available. + Details
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- Definition 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 + Details
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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 + Details
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