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Loans and Allowance for Credit Losses - Classes of loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Classes of loans
Total loans	$ 95,972		$ 91,390
Allowance for credit losses	859	$ 693	675	$ 651	$ 587	$ 543
Net loans	95,113		90,715
Accrued interest on loans	329		290
U.S. Department of Agriculture Guaranteed Loans
Classes of loans
Net loans	2,674		2,752
Mortgage loans on real estate
Classes of loans
Total loans	87,473		83,361
Mortgage loans on real estate \| Residential 1-4 family
Classes of loans
Total loans	65,001		62,842
Allowance for credit losses	267	258	247	244	237	262
Mortgage loans on real estate \| Commercial
Classes of loans
Total loans	21,166		17,739
Allowance for credit losses	505	347	332	320	287	218
Mortgage loans on real estate \| Construction and land development
Classes of loans
Total loans	1,306		2,780
Allowance for credit losses	5	8	15	12	9	11
Commercial loans
Classes of loans
Total loans	4,851		5,000
Allowance for credit losses	63	62	65	59	39	36
Consumer
Classes of loans
Total loans	3,648		3,029
Allowance for credit losses	$ 19	$ 18	$ 16	$ 16	$ 15	$ 16