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Other Real Estate Owned Narrative (Details) $ in Thousands | Jun. 30, 2020 contract | Dec. 31, 2019 USD ($) contract
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Receivables [Abstract] |  |
Mortgage Loans In Process Of Foreclosure Number | contract | 0 | 2
Mortgage Loans in Process of Foreclosure, Amount | $ |  | $ 334

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- Definition Mortgage Loans In Process Of Foreclosure Number + 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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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL49126937-111524 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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