Regulatory Matters (Regulatory capital amounts and ratios) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)
Actual, Amount	$ 69,091	$ 68,639
Actual, Ratio	16.90%	16.50%
For Capital Adequacy, Amount	16,334	16,619
For Capital Adequacy, Ratio	4.00%	4.00%
Total Risk-Based Capital (To Risk Weighted Assets)
Actual, Amount	84,397	84,148
Actual, Ratio	20.70%	20.30%
For Capital Adequacy, Amount	32,668	33,237
For Capital Adequacy, Ratio	8.00%	8.00%
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)
Actual, Amount	69,091	68,639
Actual, Ratio	7.90%	7.70%
For Capital Adequacy, Amount	34,819	35,552
For Capital Adequacy, Ratio	4.00%	4.00%
Security Federal Bank [Member]
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)
Actual, Amount	81,597	80,822
Actual, Ratio	20.00%	19.50%
For Capital Adequacy, Amount	16,324	16,606
For Capital Adequacy, Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	24,485	24,909
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.00%	6.00%
Total Risk-Based Capital (To Risk Weighted Assets)
Actual, Amount	86,761	86,012
Actual, Ratio	21.30%	20.70%
For Capital Adequacy, Amount	32,647	33,212
For Capital Adequacy, Ratio	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	40,809	41,515
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)
Actual, Amount	81,597	80,822
Actual, Ratio	9.40%	9.10%
For Capital Adequacy, Amount	34,808	35,541
For Capital Adequacy, Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 43,510	$ 44,426
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%