Stockholders' Equity - Summary of capital comparison with minimum requirements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	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	$ 36,481	$ 37,975
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Ratio	15.15%	17.37%
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount	$ 10,837	$ 9,840
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	$ 15,653	$ 14,213
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	$ 39,496	$ 40,237
Total Capital (to Risk Weighted Assets) Actual Ratio	0.164	0.184
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount	$ 19,265	$ 17,493
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio	0.08	0.08	0.625
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 24,082	$ 21,867
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.10	0.10
Tier I Capital (to Risk Weighted Assets) Actual Amount	$ 36,481	$ 37,975
Tier I Capital (to Risk Weighted Assets) Actual Ratio	0.1515	0.1737
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount	$ 14,449	$ 13,120
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio	0.06	0.06
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 19,265	$ 17,493
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.08	0.08
Tier I Capital (to Average Assets) Actual Amount	$ 36,481	$ 37,975
Tier I Capital (to Average Assets) Actual Ratio	0.0997	0.1076
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount	$ 14,640	$ 14,113
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio	0.04	0.04
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 18,300	$ 17,641
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.05	0.05
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	0.08
Tier I Capital (to Average Assets) Actual Ratio	0.04
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