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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 23, 2021
Jun. 30, 2020
Registrant CIK 0000318673    
Fiscal Year End --12-31    
Registrant Name Security National Financial Corporation    
SEC Form 10-K    
Period End date Dec. 31, 2020    
Tax Identification Number (TIN) 87-0345941    
Entity Public Float     $ 50,000,000
Filer Category Non-accelerated Filer    
Current with reporting Yes    
Interactive Data Current Yes    
Entity Well Known Seasoned Issuer No    
Entity Voluntary Filers No    
Shell Company false    
Small Business true    
Emerging Growth Company false    
Entity Incorporation, State or Country Code UT    
Entity File Number 000-09341    
Entity Address, Address Line One 121 West Election Road    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Draper    
Entity Address, State or Province UT    
Entity Address, Postal Zip Code 84020    
City Area Code (801)    
Local Phone Number 264-1060    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Document Annual Report true    
Document Transition Report false    
Common Class A      
Number of common stock shares outstanding   16,621,147  
Common Class C      
Number of common stock shares outstanding   2,679,603