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Document and Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Mar. 27, 2019
Registrant Name   SECURITY NATIONAL FINANCIAL CORPORATION  
Registrant CIK   0000318673  
SEC Form   10-K  
Period End date   Dec. 31, 2018  
Fiscal Year End   --12-31  
Trading Symbol   snfca  
Tax Identification Number (TIN)   870345941  
Public Float $ 31,000,000    
Filer Category   Non-accelerated Filer  
Current with reporting   Yes  
Voluntary filer   No  
Well-known Seasoned Issuer   No  
Shell Company   false  
Small Business   true  
Emerging Growth Company   false  
Amendment Flag   false  
Document Fiscal Year Focus   2018  
Document Fiscal Period Focus   FY  
Entity Incorporation, State Country Name   UTAH  
Entity Address, Address Line One   5300 South 360 West  
Entity Address, Address Line Two   Suite 250  
Entity Address, City or Town   Salt Lake City  
Entity Address, State or Province   Utah  
Entity Address, Postal Zip Code   84123  
City Area Code   (801)  
Local Phone Number   264-1060  
Entity Listing, Par Value Per Share $ 5.20    
Common Class A      
Number of common stock shares outstanding     15,312,687
Common Class C      
Number of common stock shares outstanding     2,190,361