Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Mar. 21, 2014	Jun. 28, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	NATIONAL SECURITY GROUP INC
Entity Central Index Key	0000865058
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q4
Amendment Flag	false
Entity Common Stock, Shares Outstanding		2,494,480
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 10,908,436