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Employee Benefits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Contribution Plan [Line Items]      
Matched percentage by employer 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Maximum employee percentage of deferred salary matched by employer 6.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Non-elective safe-harbor contribution received each December 31st 3.00%efsi_NonElectiveSafeHarborEmployerContributionAndAgeWeightedEmployerContributionPercent    
Employer contributions $ 927us-gaap_DefinedBenefitPlanContributionsByEmployer $ 888us-gaap_DefinedBenefitPlanContributionsByEmployer $ 867us-gaap_DefinedBenefitPlanContributionsByEmployer
Maximum age benefit could be reduced or forfeited 65 years    
Supplemental income benefit liability 78efsi_ExecutiveSupplementalIncomeBenefitLiability 93efsi_ExecutiveSupplementalIncomeBenefitLiability  
Supplemental income benefit expense $ 21efsi_ExecutiveSupplementalIncomeBenefitExpense $ 8efsi_ExecutiveSupplementalIncomeBenefitExpense $ 16efsi_ExecutiveSupplementalIncomeBenefitExpense
Minimum [Member]      
Defined Contribution Plan [Line Items]      
Non-elective safe-harbor contribution received each December 31st 1.00%efsi_NonElectiveSafeHarborEmployerContributionAndAgeWeightedEmployerContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Defined Contribution Plan [Line Items]      
Non-elective safe-harbor contribution received each December 31st 10.00%efsi_NonElectiveSafeHarborEmployerContributionAndAgeWeightedEmployerContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember