Cover - shares	6 Months Ended
	Jun. 30, 2021	Aug. 12, 2021
Affiliate, Collateralized Security [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021
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	121 West Election Road
Entity Address, Address Line Two	Suite
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
Title of 12(b) Security	Class A Common Stock
Trading Symbol	SNFCA
Security Exchange Name	NASDAQ
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
Common Class A [Member]
Affiliate, Collateralized Security [Line Items]
Entity Common Stock, Shares Outstanding		17,582,869
Common Class C [Member]
Affiliate, Collateralized Security [Line Items]
Entity Common Stock, Shares Outstanding		2,762,629