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Stockholders' Equity - Summary of capital comparison with minimum requirements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Annual increase in capital (to risk weighted assets) for capital adequacy purposes ratio 0.625%    
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Amount $ 32,946 $ 33,962  
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Ratio 12.83% 13.63%  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount $ 11,553 $ 11,213  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 4.50% 4.50%  
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Amount $ 16,687 $ 16,197  
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Ratio 6.50% 6.50%  
Total Capital (to Risk Weighted Assets) Actual Amount $ 35,543 $ 36,471  
Total Capital (to Risk Weighted Assets) Actual Ratio 13.84% 14.64%  
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 20,538 $ 19,935  
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 8.00% 8.00% 0.625%
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 25,673 $ 24,918  
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00% 10.00%  
Tier I Capital (to Risk Weighted Assets) Actual Amount $ 32,946 $ 33,962  
Tier I Capital (to Risk Weighted Assets) Actual Ratio 12.83% 13.63%  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 15,404 $ 14,951  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 6.00% 6.00%  
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 20,538 $ 19,935  
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 8.00% 8.00%  
Tier I Capital (to Average Assets) Actual Amount $ 32,928 $ 33,962  
Tier I Capital (to Average Assets) Actual Ratio 8.43% 8.68%  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount $ 15,617 $ 15,659  
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 Amount $ 19,521 $ 19,574  
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00% 5.00%  
Minimum      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total Capital (to Risk Weighted Assets) Actual Ratio 8.00%    
Tier I Capital (to Risk Weighted Assets) Actual Ratio 4.00%    
Tier I Capital (to Average Assets) Actual Ratio 4.00%    
Maximum      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 2.50%    
Tier I Capital (to Risk Weighted Assets) Actual Ratio 6.00%