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Fair Value Measurements (Level 3 Financial Assets Measured At Estimated Fair Value On Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Fair Value Assets Measurements On Nonrecurring Basis [Line Items] |  |
Total assets at fair value | $ 101,186 | $ 114,134
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets Measurements On Nonrecurring Basis [Line Items] |  |
Total assets at fair value |  |
Impaired Loans [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets Measurements On Nonrecurring Basis [Line Items] |  |
Balance - January 1, 2012 | 3,425 |
Sales proceeds |  |
Valuation allowance |  |
(Loss) on disposition |  |
Transfers into Level 3 | 959 |
Transfers out of Level 3 | (2,683) |
Total assets at fair value | 1,701 |
Other Real Estate Owned [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets Measurements On Nonrecurring Basis [Line Items] |  |
Balance - January 1, 2012 | 636 |
Sales proceeds |  |
Valuation allowance |  |
(Loss) on disposition |  |
Transfers into Level 3 |  |
Transfers out of Level 3 | (636) |
Total assets at fair value |  |

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- Definition Gain Loss On Disposition Of Assets Fair Value Disclosure Nonrecurring + References No definition available. + Details
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- Definition Sales Proceeds Fair Value Disclosure Nonrecurring + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
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- Definition Transfers Into Level Three Fair Value Disclosure Nonrecurring + References No definition available. + Details
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Namespace Prefix: | efsi_
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- Definition Transfers Out Of Level Three Fair Value Disclosure Nonrecurring + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Valuation Allowance Fair Value Disclosure Nonrecurring + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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