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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
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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%

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