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

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- Definition Assets and liabilities considered financial instruments, percentage. + References No definition available. + Details
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- Details
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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 + Details
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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 + Details
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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 + Details
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