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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2017
Regulatory Matters [Abstract]  
Summary of State Bank's actual capital amounts and ratios
  Actual  For Capital Adequacy Purposes  To Be Well Capitalized Under Prompt Corrective Action Procedures 
($ in thousands) Amount  Ratio  Amount  Ratio  Amount  Ratio 
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%
                         
As of December 31, 2016                        
Tier I Capital to average assets $74,183   9.31% $31,875   4.0% $39,844   5.0%
Tier I Common equity capital to risk-weighted assets  74,183   10.28%  32,477   4.5%  46,912   6.5%
                         
Tier I Capital to risk-weighted assets  74,183   10.28%  43,303   6.0%  57,738   8.0%
Total Risk-based capital to risk-weighted assets  81,908   11.35%  57,738   8.0%  72,172   10.0%