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Regulatory Matters (Details) - Summary of State Bank's actual capital amounts and ratios - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Summary of State Bank's actual capital amounts and ratios [Abstract]    
Tier I Capital to average assets, Actual, Amount $ 116,884 $ 110,022
Tier I Capital to average assets, Actual, Ratio 11.36% 11.23%
Tier I Capital to average assets, Adequacy Purposes, Amount $ 41,165 $ 39,183
Tier I Capital to average assets, Adequacy Purposes, Ratio 4.00% 4.00%
Tier I Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount $ 51,456 $ 48,979
Tier I Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Ratio 5.00% 5.00%
Tier I Common equity capital to risk-weighted assets, Actual, Amount $ 116,884 $ 110,022
Tier I Common equity capital to risk-weighted assets, Actual, Ratio 12.46% 12.57%
Tier I Common equity capital to risk-weighted assets, Adequacy Purposes, Amount $ 42,204 $ 39,386
Tier I Common equity capital to risk-weighted assets, Adequacy Purposes, Ratio 4.50% 4.50%
Tier I Common equity capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount $ 60,962 $ 56,890
Tier I Common equity capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Ratio 6.50% 6.50%
Tier I Capital to risk-weighted assets, Actual, Amount $ 116,884 $ 110,022
Tier I Capital to risk-weighted assets, Actual, Ratio 12.46% 12.57%
Tier I Capital to risk-weighted assets, Adequacy Purposes, Amount $ 56,273 $ 52,514
Tier I Capital to risk-weighted assets, Adequacy Purposes, Ratio 6.00% 6.00%
Tier I Capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount $ 75,030 $ 70,019
Tier I Capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Ratio 8.00% 8.00%
Total Risk-based capital to risk-weighted assets, Actual, Amount $ 125,639 $ 118,189
Total Risk-based capital to risk-weighted assets, Actual, Ratio 13.40% 13.50%
Total Risk-based capital to risk-weighted assets, Adequacy Purposes, Amount $ 75,030 $ 70,019
Total Risk-based capital to risk-weighted assets, Adequacy Purposes, Ratio 8.00% 8.00%
Total Risk-based capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount $ 93,788 $ 87,524
Total Risk-based capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Ratio 10.00% 10.00%