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Fair Value Measurements (Financial And Nonfinancial Assets Measured At Fair Value On A Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 2,391us-gaap_RealEstateAcquiredThroughForeclosure	$ 2,102us-gaap_RealEstateAcquiredThroughForeclosure
Financial Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	3,419efsi_FairValueOfImpairedLoans / us-gaap_FairValueByAssetClassAxis = efsi_FinancialAssetsMember	1,751efsi_FairValueOfImpairedLoans / us-gaap_FairValueByAssetClassAxis = efsi_FinancialAssetsMember
Financial Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0efsi_FairValueOfImpairedLoans / us-gaap_FairValueByAssetClassAxis = efsi_FinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0efsi_FairValueOfImpairedLoans / us-gaap_FairValueByAssetClassAxis = efsi_FinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Financial Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	3,419efsi_FairValueOfImpairedLoans / us-gaap_FairValueByAssetClassAxis = efsi_FinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	1,751efsi_FairValueOfImpairedLoans / us-gaap_FairValueByAssetClassAxis = efsi_FinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Nonfinancial Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	2,391us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = efsi_NonfinancialAssetsMember	2,102us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = efsi_NonfinancialAssetsMember
Nonfinancial Assets [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	0us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = efsi_NonfinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Nonfinancial Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	0us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = efsi_NonfinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = efsi_NonfinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Nonfinancial Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 2,391us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = efsi_NonfinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 2,102us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = efsi_NonfinancialAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

X

- Definition

Fair value of impaired loans.

+ References

No definition available.

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X

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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