Loans - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	$ 9,789	$ 7,627
Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	6,915	4,731
Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	899	675
Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	368	298
Real estate loans: | Commercial and multifamily:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	5,626	3,734
Real estate loans: | Construction and land:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	22	24
Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	2,873	2,885
Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	501	521
Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	2,363	2,363
Consumer loans: | Other consumer:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	9	1
Commercial business loans
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	11
Commercial Real Estate
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	4,561	3,734
Commercial Real Estate | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	4,561	3,734
Commercial Real Estate | Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Commercial Real Estate | Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Commercial Real Estate | Real estate loans: | Commercial and multifamily:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	4,561	3,734
Commercial Real Estate | Real estate loans: | Construction and land:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Commercial Real Estate | Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Commercial Real Estate | Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Commercial Real Estate | Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Commercial Real Estate | Consumer loans: | Other consumer:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Commercial Real Estate | Commercial business loans
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Residential Real Estate
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	673	609
Residential Real Estate | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	673	609
Residential Real Estate | Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	305	311
Residential Real Estate | Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	368	298
Residential Real Estate | Real estate loans: | Commercial and multifamily:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Residential Real Estate | Real estate loans: | Construction and land:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Residential Real Estate | Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Residential Real Estate | Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Residential Real Estate | Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Residential Real Estate | Consumer loans: | Other consumer:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Residential Real Estate | Commercial business loans
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Land
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	22	24
Land | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	22	24
Land | Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Land | Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Land | Real estate loans: | Commercial and multifamily:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Land | Real estate loans: | Construction and land:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	22	24
Land | Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Land | Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Land | Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Land | Consumer loans: | Other consumer:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Land | Commercial business loans
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Other Residential
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	3,458	3,248
Other Residential | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	594	364
Other Residential | Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	594	364
Other Residential | Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Other Residential | Real estate loans: | Commercial and multifamily:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Other Residential | Real estate loans: | Construction and land:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Other Residential | Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	2,864	2,884
Other Residential | Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	501	521
Other Residential | Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	2,363	2,363
Other Residential | Consumer loans: | Other consumer:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Other Residential | Commercial business loans
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
RVs/Automobiles
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	9	1
RVs/Automobiles | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
RVs/Automobiles | Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
RVs/Automobiles | Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
RVs/Automobiles | Real estate loans: | Commercial and multifamily:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
RVs/Automobiles | Real estate loans: | Construction and land:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
RVs/Automobiles | Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	9	1
RVs/Automobiles | Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
RVs/Automobiles | Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
RVs/Automobiles | Consumer loans: | Other consumer:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	9	1
RVs/Automobiles | Commercial business loans
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Business Assets
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	1,065	11
Business Assets | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	1,065	0
Business Assets | Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Business Assets | Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Business Assets | Real estate loans: | Commercial and multifamily:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	1,065	0
Business Assets | Real estate loans: | Construction and land:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Business Assets | Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Business Assets | Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Business Assets | Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Business Assets | Consumer loans: | Other consumer:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	0
Business Assets | Commercial business loans
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	$ 0	$ 11