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Deposits (Composition of Deposits) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deposits [Abstract]
Noninterest bearing demand deposits	$ 159,352us-gaap_NoninterestBearingDepositLiabilitiesDomestic	$ 147,698us-gaap_NoninterestBearingDepositLiabilitiesDomestic
Savings and interest bearing demand deposits:
NOW accounts	81,441us-gaap_InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW	85,459us-gaap_InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW
Money market accounts	98,314us-gaap_InterestBearingDomesticDepositMoneyMarket	92,125us-gaap_InterestBearingDomesticDepositMoneyMarket
Regular savings accounts	69,550us-gaap_InterestBearingDomesticDepositSavings	63,165us-gaap_InterestBearingDomesticDepositSavings
Savings and interest bearing demand deposits	249,305us-gaap_InterestBearingDepositLiabilitiesDomestic	240,749us-gaap_InterestBearingDepositLiabilitiesDomestic
Time deposits:
Balances of less than $250,000	85,899efsi_TimeDepositsLessthan250000	91,076efsi_TimeDepositsLessthan250000
Balances of $250,000 and more	9,260efsi_TimeDeposits250000orMore	8,064efsi_TimeDeposits250000orMore
Time deposits	95,159us-gaap_TimeDeposits	99,140us-gaap_TimeDeposits
Total deposits	$ 503,816us-gaap_DepositsDomestic	$ 487,587us-gaap_DepositsDomestic

X

- Definition

The aggregate amount of time deposit liabilities in denominations of $250,000 or more.

+ References

No definition available.

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- Definition

The aggregate amount of time deposits that total to less than $250,000.

+ References

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- Definition

The aggregate of all domestic interest-bearing and noninterest-bearing deposit liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9

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- Definition

Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Name Regulation S-X (SX)

-Number 210

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- Definition

Amount of interest-bearing domestic money market demand account deposit liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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- Definition

Amount of interest-bearing domestic negotiable order of withdrawal (NOW) demand deposit liabilities.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

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-Subparagraph (SX 210.9-03.12)

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- Definition

Amount of interest-bearing domestic savings deposit liabilities. Saving deposits bear interest and have no stated maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.12)

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- Definition

Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

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- Definition

Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

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

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