Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Mar. 21, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity Central Index Key	0000818677
Entity Registrant Name	SECURITY FEDERAL CORP
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	000-16120
Entity Incorporation, State or Country Code	SC
Entity Tax Identification Number	57-0858504
Entity Address, Address Line One	238 Richland Avenue Northwest
Entity Address, City or Town	Aiken
Entity Address, State or Province	SC
Entity Address, Postal Zip Code	29801
City Area Code	803
Local Phone Number	641-3000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		3,229,325
Entity Public Float			$ 44,257,125
Auditor Firm ID	149
Auditor Name	Elliott Davis, LLC
Auditor Location	Columbia, South Carolina