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Regulatory Matters (Tables)
9 Months Ended
Sep. 30, 2018
Banking and Thrift [Abstract]  
Regulatory capital amounts and ratios
 
Actual
 
For Capital Adequacy
 
To Be "Well-Capitalized"
(Dollars in Thousands)
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
SECURITY FEDERAL CORP.
September 30, 2018
Tier 1 Risk-Based Core Capital
(To Risk Weighted Assets)
$
83,660

 
15.5%
 
$
32,339

 
6.0%
 
N/A
 
N/A
Total Risk-Based Capital
(To Risk Weighted Assets)
90,418

 
16.8%
 
43,119

 
8.0%
 
N/A
 
N/A
Common Equity Tier 1 Capital (To Risk Weighted Assets)
78,660

 
14.6%
 
24,255

 
4.5%
 
N/A
 
N/A
Tier 1 Leverage (Core) Capital
(To Adjusted Tangible Assets)
83,660

 
9.3%
 
35,979

 
4.0%
 
N/A
 
N/A
SECURITY FEDERAL BANK
 
 
 
 
 
 
 
 
 
 
 
Tier 1 Risk-Based Core Capital
(To Risk Weighted Assets)
$
89,073

 
16.5%
 
$
32,330

 
6.0%
 
$
43,107

 
8.0%
Total Risk-Based Capital
(To Risk Weighted Assets)
95,831

 
17.8%
 
43,107

 
8.0%
 
53,883

 
10.0%
Common Equity Tier 1 Capital (To Risk Weighted Assets)
89,073

 
16.5%
 
24,248

 
4.5%
 
35,024

 
6.5%
Tier 1 Leverage (Core) Capital
(To Adjusted Tangible Assets)
89,073

 
9.9%
 
35,972

 
4.0%
 
44,965

 
5.0%
SECURITY FEDERAL CORP.
December 31, 2017
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%