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Regulatory Restrictions and Capital Ratios (Tables)
 12 Months Ended
Dec. 31, 2021
Regulatory Capital Requirements [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
Minimum for capital
Minimum to be
 
Actual
adequacy purposes
well capitalized
(Dollars in thousands)
Amount
Ratio
Amount
Ratio
Amount
Ratio
At December 31, 2021:
Tier 1 Leverage Capital
$
100,059
9.35
%
$
42,808
4.00
%
$
53,509
5.00
%
Common Equity Tier 1 Capital
100,059
16.23
27,742
4.50
40,072
6.50
Tier 1 Risk-Based Capital
100,059
16.23
36,990
6.00
49,320
8.00
Total Risk-Based Capital
105,163
17.06
49,320
8.00
61,649
10.00
At December 31, 2020:
Tier 1 Leverage Capital
$
96,096
10.32
%
$
37,263
4.00
%
$
46,579
5.00
%
Common Equity Tier 1 Capital
96,096
17.27
25,042
4.50
36,171
6.50
Tier 1 Risk-Based Capital
96,096
17.27
33,389
6.00
44,519
8.00
Total Risk-Based Capital
101,906
18.31
44,519
8.00
55,648
10.00