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Troubled Debt Restructurings (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 contract | Mar. 31, 2014 contract | Dec. 31, 2014 contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 0 efsi_TroubledDebtRestructuringModificationsNumberOfContracts | 1 efsi_TroubledDebtRestructuringModificationsNumberOfContracts |
Number of troubled debt restructured loans | 25 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |  | 25 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Loan is considered payment default | 30 days |  |
Financing Receivable, Modifications, Nonaccrual, Number of Contracts | 4 efsi_FinancingReceivableModificationsNonaccrualNumberofContracts |  | 8 efsi_FinancingReceivableModificationsNonaccrualNumberofContracts
Financing Receivable, Modifications, Nonaccrual, Recorded Investment | $ 947,000 efsi_FinancingReceivableModificationsNonaccrualRecordedInvestment |  | $ 1,400,000 efsi_FinancingReceivableModificationsNonaccrualRecordedInvestment
Total troubled debt restructured loans | $ 7,700,000 us-gaap_FinancingReceivableModificationsRecordedInvestment |  | $ 7,800,000 us-gaap_FinancingReceivableModificationsRecordedInvestment
Residential Equity Lines [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled Debt Restructuring Modifications Interest Only Number Of Contracts |  | 1 efsi_TroubledDebtRestructuringModificationsInterestOnlyNumberOfContracts / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = efsi_ResidentialEquityLinesFinancingReceivableMember |

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- Definition Financing Receivable, Modifications, Nonaccrual, Recorded Investment + References No definition available. + Details
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- Definition Period Past Due Loan Considered Payment Default + References No definition available. + Details
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- Definition Troubled debt restructuring modifications number of contracts. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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