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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 26, 2024
Jun. 30, 2023
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Current Fiscal Year End Date --12-31    
Entity File Number 000-09341    
Entity Registrant Name SECURITY NATIONAL FINANCIAL CORPORATION    
Entity Central Index Key 0000318673    
Entity Tax Identification Number 87-0345941    
Entity Incorporation, State or Country Code UT    
Entity Address, Address Line One 433 West Ascension Way    
Entity Address, City or Town Salt Lake City    
Entity Address, State or Province UT    
Entity Address, Postal Zip Code 84123    
City Area Code (801)    
Local Phone Number 264-1060    
Title of 12(b) Security Class A Common Stock    
Trading Symbol SNFCA    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 Public Float     $ 64,000,000
Documents Incorporated by Reference Portions of the following document are incorporated by reference in Part III of this Report: the registrant’s definitive proxy statement relating to its 2024 Annual Meeting of Shareholders    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Salt Lake City, UT    
Common Class A [Member]      
Entity Common Stock, Shares Outstanding   20,048,581  
Common Class C [Member]      
Entity Common Stock, Shares Outstanding   2,971,680