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Stockholders' Equity - Reconciliation of GAAP Capital and Regulatory Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Millington Bank    
Tier 1 leverage capital ratio    
Actual, amount $ 61,991 $ 61,740
Actual, ratio 10.70% 10.71%
For capital adequacy purposes, amount $ 23,164 $ 23,052
For capital adequacy purposes, ratio 4.00% 4.00%
To be well capitalized, amount $ 28,955 $ 28,816
To be well capitalized, ratio 5.00% 5.00%
Common equity tier 1 capital ratio    
Actual, amount $ 61,991 $ 61,740
Actual, ratio 11.43% 11.90%
For capital adequacy purposes, amount $ 24,396 $ 23,351
For capital adequacy purposes, ratio 4.50% 4.50%
To be well capitalized, amount $ 35,239 $ 33,729
To be well capitalized, ratio 6.50% 6.50%
Tier 1 capital ratio    
Actual, amount $ 61,991 $ 61,740
Actual, ratio 11.43% 11.90%
For capital adequacy purposes, amount $ 32,528 $ 31,134
For capital adequacy purposes, ratio 6.00% 6.00%
To be well capitalized, amount $ 43,371 $ 41,512
To be well capitalized, ratio 8.00% 8.00%
Total capital ratio    
Actual, amount $ 67,801 $ 67,467
Actual, ratio 12.51% 13.00%
For capital adequacy purposes, amount $ 43,371 $ 41,512
For capital adequacy purposes, ratio 8.00% 8.00%
To be well capitalized, amount $ 54,213 $ 51,891
To be well capitalized, ratio 10.00% 10.00%
MSB Financial Corp    
Tier 1 leverage capital ratio    
Actual, amount $ 65,375 $ 66,646
Actual, ratio 11.33% 11.56%
Common equity tier 1 capital ratio    
Actual, amount $ 65,375 $ 66,646
Actual, ratio 12.06% 12.84%
Tier 1 capital ratio    
Actual, amount $ 65,375 $ 66,646
Actual, ratio 12.06% 12.84%
Total capital ratio    
Actual, amount $ 71,185 $ 72,373
Actual, ratio 13.13% 13.95%