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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 27, 2025
Jun. 30, 2024
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
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     $ 68,000,000
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 2025 Annual Meeting of Shareholders.    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Auditor Firm ID 34    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheets of Security National Financial Corporation and subsidiaries (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of earnings, comprehensive income, stockholders’ equity, and cash flows for each of the years then ended, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years then ended, in conformity with accounting principles generally accepted in the United States of America.    
Auditor Name Deloitte & Touche LLP    
Auditor Location Salt Lake City, UT    
Common Class A [Member]      
Entity Common Stock, Shares Outstanding   21,321,739  
Entity Listing, Par Value Per Share $ 2.00    
Common Class C [Member]      
Entity Common Stock, Shares Outstanding   3,367,334  
Entity Listing, Par Value Per Share $ 2.00