Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 12, 2021
Registrant CIK	0000318673
Fiscal Year End	--12-31
Registrant Name	Security National Financial Corporation
SEC Form	10-Q
Period End date	Mar. 31, 2021
Tax Identification Number (TIN)	87-0345941
Filer Category	Non-accelerated Filer
Current with reporting	Yes
Interactive Data Current	Yes
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	2021
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Common Class A
Number of common stock shares outstanding		16,701,916
Common Class C
Number of common stock shares outstanding		2,631,076