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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Summary of State Bank's actual capital amounts and ratios    
Tier I Capital to average assets, Actual, Amount $ 110,022 $ 83,807
Tier I Capital to average assets, Adequacy Purposes, Amount 39,183 34,477
Tier I Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount 48,979 43,097
Tier I Common equity capital to risk-weighted assets, Actual, Amount 110,022 83,807
Tier I Common equity capital to risk-weighted assets, Adequacy Purposes, Amount 39,386 35,786
Tier I Common equity capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount 56,890 51,691
Tier I Capital to risk-weighted assets, Actual, Amount 110,022 83,807
Tier I Capital to risk-weighted assets, Adequacy Purposes, Amount 52,514 47,715
Tier I Capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount 70,019 63,620
Total Risk-based capital to risk-weighted assets, Actual, Amount 118,189 91,737
Total Risk-based capital to risk-weighted assets, Adequacy Purposes, Amount 70,019 63,620
Total Risk-based capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount $ 87,524 $ 79,524
Tier I Capital to average assets, Actual, Ratio 11.23% 9.72%
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, Ratio 5.00% 5.00%
Tier I Common equity capital to risk-weighted assets, Actual, Ratio 12.57% 10.54%
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, Ratio 6.50% 6.50%
Tier I Capital to risk-weighted assets, Actual, Ratio 12.57% 10.54%
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, Ratio 8.00% 8.00%
Total Risk-based capital to risk-weighted assets, Actual, Ratio 13.50% 11.54%
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, Ratio 10.00% 10.00%