Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2017

Banking and Thrift [Abstract]

Regulatory capital amounts and ratios

The Company and the Bank’s regulatory capital amounts and ratios were as follows as of the dates indicated:

	Actual				For Capital Adequacy				To Be Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(Dollars in Thousands)
December 31, 2017
SECURITY FEDERAL CORP.
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)	$	78,790	15.8	%	$	29,998	6.0	%	N/A		N/A
Total Risk-Based Capital (To Risk Weighted Assets)	85,066		17.0	%	39,997		8.0	%	N/A		N/A
Common Equity Tier 1 Capital (To Risk Weighted Assets)	73,790		14.8	%	22,498		4.5	%	N/A		N/A
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)	78,790		9.1	%	34,518		4.0	%	N/A		N/A
SECURITY FEDERAL BANK
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)	$	88,275	17.7	%	$	29,989	6.0	%	$	39,985	8.0	%
Total Risk-Based Capital (To Risk Weighted Assets)	94,547		18.9	%	39,985		8.0	%	49,981		10.0	%
Common Equity Tier 1 Capital (To Risk Weighted Assets)	88,275		17.7	%	22,491		4.5	%	32,488		6.5	%
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)	88,275		10.2	%	34,512		4.0	%	43,140		5.0	%
December 31, 2016
SECURITY FEDERAL CORP.
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)	$	73,787	16.6	%	$	26,714	6.0	%	N/A		N/A
Total Risk-Based Capital (To Risk Weighted Assets)	79,383		17.8	%	35,618		8.0	%	N/A		N/A
Common Equity Tier 1 Capital (To Risk Weighted Assets)	68,787		15.4	%	20,035		4.5	%	N/A		N/A
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)	73,787		9.1	%	32,548		4.0	%	N/A		N/A
SECURITY FEDERAL BANK
Tier 1 Risk-Based Core Capital (To Risk Weighted Assets)	$	88,139	19.8	%	$	26,694	6.0	%	$	35,592	8.0	%
Total Risk-Based Capital (To Risk Weighted Assets)	93,735		21.1	%	35,592		8.0	%	44,490		10.0	%
Common Equity Tier 1 Capital (To Risk Weighted Assets)	88,139		19.8	%	20,021		4.5	%	28,919		6.5	%
Tier 1 Leverage (Core) Capital (To Adjusted Tangible Assets)	88,139		10.8	%	32,587		4.0	%	40,734		5.0	%