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Trust Preferred Capital Notes (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 20, 2007
Trust Preferred Capital Notes [Line Items] |  |  |
Trust preferred capital notes | $ 7,217,000 efsi_PreferredCapitalNotesOfTrust | $ 7,217,000 efsi_PreferredCapitalNotesOfTrust |
Redemption date of securities | September 1, 2037 |  |
Trust II [Member] |  |  |
Trust Preferred Capital Notes [Line Items] |  |  |
Trust preferred securities issued by subsidiary trust | 7,000,000 efsi_TrustPreferredSecuritiesIssuedBySubsidiaryTrust / dei_LegalEntityAxis = efsi_TrustIiMember |  | 7,000,000 efsi_TrustPreferredSecuritiesIssuedBySubsidiaryTrust / dei_LegalEntityAxis = efsi_TrustIiMember
Common equity issued by subsidiary trust |  |  | 217,000 efsi_CommonStockIssuedBySubsidiaryTrust / dei_LegalEntityAxis = efsi_TrustIiMember
Trust preferred capital notes |  |  | $ 7,200,000 efsi_PreferredCapitalNotesOfTrust / dei_LegalEntityAxis = efsi_TrustIiMember
Floating rate of interest | 1.88%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / dei_LegalEntityAxis = efsi_TrustIiMember |  |
Maximum [Member] |  |  |
Trust Preferred Capital Notes [Line Items] |  |  |
Portion of trust preferred securities in Tier 1 capital, percentage | 25.00%efsi_PortionOfTrustPreferredSecuritiesInTierOneCapitalPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Common Stock Issued by Subsidiary Trust + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Portion of trust preferred securities in tier one capital, percentage. + References No definition available. + Details
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- Definition Preferred Capital Notes Of Trust + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Redemption date of securities. + References No definition available. + Details
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Balance Type: | na
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- Details
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- Definition Trust preferred securities issued by subsidiary trust. + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |