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Document And Entity Information
Jan. 29, 2021
Document Information [Line Items]  
Entity, Registrant Name FIRST NATIONAL CORPORATION
Document, Type 8-K
Document, Period End Date Jan. 29, 2021
Entity, Incorporation, State or Country Code VA
Entity, File Number 0-23976
Entity, Tax Identification Number 54-1232965
Entity, Address, Address Line One 112 West King Street
Entity, Address, City or Town Strasburg
Entity, Address, State or Province VA
Entity, Address, Postal Zip Code 22657
City Area Code 540
Local Phone Number 465-9121
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol FXNC
Security Exchange Name NASDAQ
Entity, Emerging Growth Company false
Amendment Flag false
Entity, Central Index Key 0000719402