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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2018
Regulatory Matters [Abstract]  
Summary of State Bank's actual capital amounts and ratios

              To Be Well Capitalized Under Prompt 
        Adequacy  Corrective Action 
  Actual  Purposes  Procedures 
($ in thousands) Amount  Ratio  Amount  Ratio  Amount  Ratio 
As of December 31, 2018                  
Tier I Capital to average assets $110,022   11.23% $39,183   4.0% $48,979   5.0%
Tier I Common equity capital to  risk-weighted assets  110,022   12.57%  39,386   4.5%  56,890   6.5%
                         
Tier I Capital to risk-weighted assets  110,022   12.57%  52,514   6.0%  70,019   8.0%
Total Risk-based capital to  risk-weighted assets  118,189   13.50%  70,019   8.0%  87,524   10.0%
                         
As of December 31, 2017                        
Tier I Capital to average assets $83,807   9.72% $34,477   4.0% $43,097   5.0%
Tier I Common equity capital to  risk-weighted assets  83,807   10.54%  35,786   4.5%  51,691   6.5%
                         
Tier I Capital to risk-weighted assets  83,807   10.54%  47,715   6.0%  63,620   8.0%
Total Risk-based capital to  risk-weighted assets  91,737   11.54%  63,620   8.0%  79,524   10.0%