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Regulatory Matters and Trust Preferred Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Summary of State Bank's actual capital amounts and ratios    
Tier I Capital to average assets actual amount $ 64,914 $ 57,591
Tier I Capital to average assets for capital adequacy purposes amount 28,534 27,354
Tier I Capital to average assets to be well capitalized under prompt corrective action provisions amount 35,668 33,333
Tier I Common equity capital to risk-weighted assets actual amount 64,914  
Tier I Common equity capital to risk-weighted assets for capital adequacy purposes 28,545  
Tier I Common equity capital to risk-weighted assets to be well capitalized under prompt corrective action procedures amount 41,231  
Tier I Capital to risk-weighted assets actual amount 64,914 57,591
Tier I Capital to risk-weighted assets for capital adequacy purposes 38,059 21,253
Tier I Capital to risk-weighted assets to be well capitalized under prompt corrective action procedures 50,746 31,879
Total Risk-based capital to risk-weighted assets actual amount 71,904 63,664
Total Risk-based capital to risk-weighted assets for capital adequacy purposes amount 50,746 42,506
Total Risk-based capital to risk-weighted assets to be well capitalized under prompt corrective action provisions amount $ 63,432 $ 53,132
Tier I Capital to average assets actual ratio 9.10% 8.55%
Tier I Capital to average assets for capital adequacy purposes ratio 4.00% 4.00%
Tier I Capital to average assets to be well capitalized under prompt corrective action provisions ratio 5.00% 5.00%
Tier I Common equity capital to risk-weighted assets actual ratio 10.23%  
Tier I Common equity capital to risk-weighted assets for capital adequacy purposes 4.50%  
Tier I Common equity capital to risk-weighted assets to be well capitalized under prompt corrective action procedures ratio 6.50%  
Tier I Capital to risk-weighted assets actual ratio 10.23% 10.73%
Tier I Capital to risk-weighted assets for capital adequacy purposes ratio 6.00% 4.00%
Tier I Capital to risk-weighted assets to be well capitalized under prompt corrective action procedures ratio 8.00% 6.00%
Total Risk-based capital to risk-weighted assets actual ratio 11.34% 11.98%
Total Risk-based capital to risk-weighted assets capital adequacy purposes ratio 8.00% 8.00%
Total Risk-based capital to risk-weighted assets to be well capitalized under prompt corrective action provisions ratio 10.00% 10.00%