General (Details)	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Ownership percentage in subsidiaries	100.00%

Consolidated Financial Ownership Wholly Owned Subsidiary Percentage

No definition available.

Name:	efsi_ConsolidatedFinancialOwnershipWhollyOwnedSubsidiaryPercentage
Namespace Prefix:	efsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant