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Stockholders' Equity - Summary of capital comparison with minimum requirements (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Company      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total Capital (to Risk Weighted Assets) Actual Amount $ 36,750,000 $ 37,506,000 $ 36,959,000
Total Capital (to Risk Weighted Assets) Actual Ratio 14.70% 15.50% 14.30%
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount     $ 20,645,810
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio     8.00%
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio
Tier I Capital (to Risk Weighted Assets) Actual Amount $ 34,241,000 $ 34,477,000 $ 33,728,000
Tier I Capital (to Risk Weighted Assets) Actual Ratio 13.70% 14.20% 13.10%
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount     $ 10,322,265
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio     4.00%
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio
Tier I Capital (to Average Assets) Actual Amount $ 34,241,000 $ 34,477,000 $ 33,728,000
Tier I Capital (to Average Assets) Actual Ratio 8.70% 8.80% 8.50%
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount     $ 15,834,742
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio     4.00%
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Amount $ 34,241,000 $ 34,477,000  
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Ratio 13.70% 14.20%  
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Amount  
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Ratio  
Company | Minimum Capital Required - Basel III Phased-In Schedule      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 21,503,986 $ 19,382,946  
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 8.625% 8.00%  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 16,509,944 $ 14,537,034  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 6.625% 6.00%  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount $ 15,670,938 $ 15,724,971  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio 4.00% 4.00%  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount $ 12,771,843 $ 10,902,776  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 5.125% 4.50%  
Company | Minimum Capital Required - Basel III Fully Phased-In Schedule      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 26,178,765 $ 25,440,116  
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 10.50% 10.50%  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 21,182,569 $ 20,594,132  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 8.50% 8.50%  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount $ 15,670,938 $ 15,724,971  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio 4.00% 4.00%  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount $ 17,444,469 $ 16,959,874  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 7.00% 7.00%  
Bank      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total Capital (to Risk Weighted Assets) Actual Amount $ 36,471,000 $ 37,213,000 $ 36,655,000
Total Capital (to Risk Weighted Assets) Actual Ratio 14.60% 15.40% 14.30%
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount     $ 20,477,654
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio     8.00%
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 24,911,885 $ 24,211,451 $ 25,597,067
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00% 10.00% 10.00%
Tier I Capital (to Risk Weighted Assets) Actual Amount $ 33,962,000 $ 34,185,000 $ 33,454,000
Tier I Capital (to Risk Weighted Assets) Actual Ratio 13.60% 14.10% 13.10%
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount     $ 10,238,409
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio     4.00%
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 19,933,676 $ 19,368,272 $ 15,357,613
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 8.00% 8.00% 6.00%
Tier I Capital (to Average Assets) Actual Amount $ 33,962,000 $ 34,185,000 $ 33,454,000
Tier I Capital (to Average Assets) Actual Ratio 8.70% 8.70% 8.40%
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount     $ 16,006,699
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio     4.00%
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 19,563,364 $ 19,646,552 $ 20,008,373
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00% 5.00% 5.00%
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Amount $ 33,962,000 $ 34,185,000  
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Ratio 13.60% 14.10%  
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Amount $ 16,196,112 $ 15,736,721  
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Ratio 6.50% 6.50%  
Bank | Minimum Capital Required - Basel III Phased-In Schedule      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 21,486,501 $ 19,369,161  
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 8.625% 8.00%  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 16,507,575 $ 14,526,204  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 6.625% 6.00%  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount $ 15,650,691 $ 15,717,241  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio 4.00% 4.00%  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount $ 12,770,011 $ 10,894,653  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 5.125% 4.50%  
Bank | Minimum Capital Required - Basel III Fully Phased-In Schedule      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 26,157,480 $ 25,422,023  
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 10.50% 10.50%  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 21,179,530 $ 20,578,789  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 8.50% 8.50%  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount $ 15,650,691 $ 15,717,241  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio 4.00% 4.00%  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount $ 17,441,966 $ 16,947,238  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 7.00% 7.00%