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Allowance for Loan Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivables | $ 430,488 | $ 404,790
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivables | 21,622 | 18,866
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivables | 3,616 | 928
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivables | 14,125 | 28,589
Consumer [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | 1 |
Financing receivables | 3 |
Consumer [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | 1 |
Financing receivables | 6 |
Consumer [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans |  | 1
Financing receivables |  | $ 8

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Namespace Prefix: | efsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Credit Quality Loans And Leases Receivables Number Of Loans + References No definition available. + Details
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Namespace Prefix: | efsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration