Regulatory Matters (Regulatory capital amounts and ratios) (Details) - Security Federal Bank [Member]	Mar. 31, 2022	Dec. 31, 2021
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)
For Capital Adequacy, Ratio	0.060	0.060
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080	0.080
Total Risk-Based Capital (To Risk Weighted Assets)
For Capital Adequacy, Ratio	0.080	0.080
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100	0.100
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)
For Capital Adequacy, Ratio	0.040	0.040
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.050	0.050