Regulatory Matters (Regulatory capital amounts and ratios) (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)
Actual, Amount	$ 89,502	$ 77,746
Actual, Ratio	23.60%	20.60%
For Capital Adequacy, Amount	$ 22,741	$ 15,073
For Capital Adequacy, Ratio	6.00%	4.00%
Total Risk-Based Capital (To Risk Weighted Assets)
Actual, Amount	$ 94,276	$ 89,915
Actual, Ratio	24.90%	23.90%
For Capital Adequacy, Amount	$ 30,322	$ 30,147
For Capital Adequacy, Ratio	8.00%	8.00%
Common Equity Tier One Capital	$ 62,502
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)
Actual, Amount	$ 89,502	$ 77,746
Actual, Ratio	11.20%	9.50%
For Capital Adequacy, Amount	$ 31,989	$ 32,778
For Capital Adequacy, Ratio	4.00%	4.00%
Security Federal Bank [Member]
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)
Actual, Amount	$ 87,787	$ 87,222
Actual, Ratio	23.20%	23.20%
For Capital Adequacy, Amount	$ 22,724	$ 15,062
For Capital Adequacy, Ratio	6.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 30,299	$ 22,593
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	6.00%
Total Risk-Based Capital (To Risk Weighted Assets)
Actual, Amount	$ 92,561	$ 91,973
Actual, Ratio	24.40%	24.40%
For Capital Adequacy, Amount	$ 30,299	$ 30,123
For Capital Adequacy, Ratio	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 37,874	$ 37,654
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Common Equity Tier One Capital	$ 87,787
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)
Actual, Amount	$ 87,787	$ 87,222
Actual, Ratio	11.00%	10.60%
For Capital Adequacy, Amount	$ 31,979	$ 32,792
For Capital Adequacy, Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 39,974	$ 40,991
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%