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Fair Value Measurements (Level 3 Financial Assets Measured At Estimated Fair Value On Nonrecurring Basis) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Impaired Loans [Member] |
Fair Value Assets Measurements On Nonrecurring Basis [Line Items] |
Balance - beginning of period | $ 1,407
Sales proceeds |
Valuation allowance |
(Loss) on disposition |
Transfers into Level 3 | 1,664
Transfers out of Level 3 | (304)
Balance - end of period | 2,767
Other Real Estate Owned [Member] |
Fair Value Assets Measurements On Nonrecurring Basis [Line Items] |
Balance - beginning of period | 0
Sales proceeds |
Valuation allowance |
(Loss) on disposition |
Transfers into Level 3 | 150
Transfers out of Level 3 | 0
Balance - end of period | $ 150

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- Details
Name: | efsi_FairValueAssetsMeasurementsOnNonrecurringBasisLineItems
Namespace Prefix: | efsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gain Loss On Disposition Of Assets Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_GainLossOnDispositionOfAssetsFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Sales Proceeds Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_SalesProceedsFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Transfers Into Level Three Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_TransfersIntoLevelThreeFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Transfers Out Of Level Three Fair Value Disclosure Nonrecurring + References No definition available. + Details
Name: | efsi_TransfersOutOfLevelThreeFairValueDisclosureNonrecurring
Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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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
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant