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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements For Certain Financial Assets) (Details) | 3 Months Ended
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Mar. 31, 2015
Impaired Loans [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 17.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember
Other Real Estate Owned [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 9.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember
Maximum [Member] | Impaired Loans [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 60.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Other Real Estate Owned [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 13.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member] | Impaired Loans [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 10.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Other Real Estate Owned [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Quantitative information about level 3 nonrecurring basis | 6.00%efsi_QuantitativeInformationLevelThreeNonrecurringBasisRange / us-gaap_FairValueByAssetClassAxis = efsi_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Definition Quantitative Information Level Three Nonrecurring Basis Range + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Details
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Period Type: |

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

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- Details
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Namespace Prefix: |
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- Details
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