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Allowance For Loan Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables | $ 404,790 | $ 397,239
Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables | 29,407 | 25,022
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables | 18,866 | 23,722
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables | 28,589 | 28,117
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables | 928 | 2,178
Consumer [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans |  | 1
Financing Receivables |  | 17
Consumer [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans |  | 1
Financing Receivables |  | 292
Consumer [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans | 1 | 4
Financing Receivables | 8 | 19
Consumer [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of loans |  | 1
Financing Receivables |  | $ 5

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- Definition Credit Quality Loans And Leases Receivable Gross Carrying Amount + References No definition available. + Details
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Namespace Prefix: | efsi_
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Balance Type: | debit
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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
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration