Stockholders' Equity - Summary of capital comparison with minimum requirements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2016
Stockholders' Equity
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	$ 37,975	$ 37,963
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Ratio	17.37%	16.45%
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount	$ 9,840	$ 10,383
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	$ 14,213	$ 14,998
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	$ 40,237	$ 39,866
Total Capital (to Risk Weighted Assets) Actual Ratio	0.1840	0.1728
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount	$ 17,493	$ 18,459
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio	0.0800	0.0800	0.625
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 21,867	$ 23,074
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	$ 37,975	$ 37,963
Tier I Capital (to Risk Weighted Assets) Actual Ratio	0.1737	0.1645
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount	$ 13,120	$ 13,845
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	$ 17,493	$ 18,459
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	$ 37,975	$ 37,963
Tier I Capital (to Average Assets) Actual Ratio	0.1076	0.0953
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount	$ 14,113	$ 15,938
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	$ 17,641	$ 19,922
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	4.00%
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	6.00%
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio	0.025