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Stockholders' Equity - Summary of capital comparison with minimum requirements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jan. 01, 2016
Stockholders' Equity      
Annual increase in capital (to risk weighted assets) for capital adequacy purposes ratio 0.00625%    
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Amount $ 37,963 $ 37,592  
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Ratio 0.1645% 0.1532%  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount $ 10,383 $ 11,044  
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 0.045% 0.045%  
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Amount $ 14,998 $ 15,952  
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Ratio 0.065% 0.065%  
Total Capital (to Risk Weighted Assets) Actual Amount $ 39,866 $ 39,329  
Total Capital (to Risk Weighted Assets) Actual Ratio 0.1728 0.1603  
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 18,459 $ 19,634  
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 0.0800 0.0800 0.00625
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 23,074 $ 24,542  
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 0.1000 0.1000  
Tier I Capital (to Risk Weighted Assets) Actual Amount $ 37,963 $ 37,592  
Tier I Capital (to Risk Weighted Assets) Actual Ratio 0.1645 0.1532  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount $ 13,845 $ 14,725  
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 0.0600 0.0600  
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 18,459 $ 19,634  
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 0.0800 0.0800  
Tier I Capital (to Average Assets) Actual Amount $ 37,963 $ 37,592  
Tier I Capital (to Average Assets) Actual Ratio 0.0953 0.0840  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount $ 15,938 $ 17,910  
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio 0.0400 0.0400  
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 19,922 $ 22,388  
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 0.0500 0.0500  
Minimum      
Stockholders' Equity      
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 4.50%    
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 0.04%    
Total Capital (to Risk Weighted Assets) Actual Ratio 0.080    
Tier I Capital (to Average Assets) Actual Ratio 0.040    
Maximum      
Stockholders' Equity      
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio 0.06%    
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio 0.025