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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 13, 2018
Registrant Name	Security National Financial Corporation
Registrant CIK	0000318673
SEC Form	10-Q
Period End date	Sep. 30, 2018
Fiscal Year End	--12-31
Trading Symbol	snfca
Tax Identification Number (TIN)	870345941
Filer Category	Non-accelerated Filer
Current with reporting	Yes
Small Business	true
Emerging Growth Company	false
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Entity Incorporation, State Country Name	UTAH
Entity Address, Address Line One	5300 South 360 West, 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
Common Class A
Number of common stock shares outstanding		14,575,881
Common Class C
Number of common stock shares outstanding		2,089,184

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