Loans Receivable and Allowance for Credit Losses - Recorded investment in loans by credit quality indicator (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Loans Receivable and Allowance for Credit Losses
Total	$ 368,253	$ 367,050
One-to-Four Family Mortgages
Loans Receivable and Allowance for Credit Losses
Year 1	10,209	12,000
Year 2	22,131	43,298
Year 3	40,741	61,336
Year 4	57,154	50,786
Year 5	47,008	28,836
Prior	155,416	140,800
Total	332,659	337,056
One-to-Four Family Mortgages | Pass
Loans Receivable and Allowance for Credit Losses
Year 1	10,209	12,000
Year 2	22,131	42,225
Year 3	39,963	60,557
Year 4	55,912	50,786
Year 5	46,651	28,836
Prior	152,989	140,000
Total	327,855	334,404
One-to-Four Family Mortgages | Special Mention
Loans Receivable and Allowance for Credit Losses
Year 2		1,073
Year 3	778	779
Year 4	836
Year 5	357
Prior	1,877	647
Total	3,848	2,499
One-to-Four Family Mortgages | Substandard
Loans Receivable and Allowance for Credit Losses
Year 4	406
Prior	550	153
Total	956	153
Home Equity Lines of Credit
Loans Receivable and Allowance for Credit Losses
Year 1	378	20
Year 2	66	226
Year 3	82
Year 5		174
Prior	531	369
Revolving	6,895	7,761
Total	7,952	8,550
Current period gross revolving write-offs	3
Current Period Gross Write-Offs	3
Home Equity Lines of Credit | Pass
Loans Receivable and Allowance for Credit Losses
Year 1	378	20
Year 2	66	226
Year 3	82
Year 5		174
Prior	531	369
Revolving	6,819	7,570
Total	7,876	8,359
Home Equity Lines of Credit | Special Mention
Loans Receivable and Allowance for Credit Losses
Revolving	76	191
Total	76	191
Construction Loans
Loans Receivable and Allowance for Credit Losses
Year 1	7,385	4,987
Year 2	1,360	2,189
Year 3	181	414
Year 4	400	366
Year 5	113
Prior	149	172
Total	9,588	8,128
Construction Loans | Pass
Loans Receivable and Allowance for Credit Losses
Year 1	7,385	4,987
Year 2	1,360	2,189
Year 3	62	414
Year 4	400	366
Year 5	113
Prior	149	172
Total	9,469	8,128
Construction Loans | Substandard
Loans Receivable and Allowance for Credit Losses
Year 3	119
Total	119
Consumer Loans
Loans Receivable and Allowance for Credit Losses
Year 1	3,002	386
Year 2	236	74
Year 3	55	39
Year 4	35	52
Year 5	71	36
Prior	300	326
Total	3,699	913
Consumer Loans | Pass
Loans Receivable and Allowance for Credit Losses
Year 1	3,002	386
Year 2	236	74
Year 3	55	39
Year 4	35	52
Year 5	71	36
Prior	300	326
Total	3,699	913
Commercial Loans
Loans Receivable and Allowance for Credit Losses
Year 1	5,119	7,568
Year 2	6,004	4,724
Year 3	3,133
Prior	99	111
Total	14,355	12,403
Commercial Loans | Pass
Loans Receivable and Allowance for Credit Losses
Year 1	5,119	7,568
Year 2	6,004	4,724
Year 3	3,133
Prior	99	111
Total	$ 14,355	$ 12,403