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Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Nov. 07, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-42512  
Entity Registrant Name EAGLE FINANCIAL SERVICES, INC.  
Entity Central Index Key 0000880641  
Current Fiscal Year End Date --12-31  
Document Period End Date Sep. 30, 2025  
Document Fiscal Year Focus 2025  
Security Exchange Name NASDAQ  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Incorporation, State or Country Code VA  
Entity Tax Identification Number 54-1601306  
Entity Address, Address Line One 2 East Main Street  
Entity Address, City or Town Berryville  
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 22611  
City Area Code (540)  
Trading Symbol EFSI  
Title of 12(b) Security Common Stock, Par Value $2.50  
Local Phone Number 955-2510  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   5,376,346