Loans - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	$ 2,852	$ 7,627
Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	2,114	4,731
Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	744	675
Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	201	298
Real estate loans: | Commercial and multifamily:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	1,065	3,734
Real estate loans: | Construction and land:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	103	24
Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	738	2,885
Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	476	521
Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans		2,363
Consumer loans: | Other consumer
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	262	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	0	3,734
Commercial Real Estate | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	0	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	0	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
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	624	609
Residential Real Estate | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	624	609
Residential Real Estate | Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	423	311
Residential Real Estate | Real estate loans: | Home equity:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	201	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
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	20	24
Land | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	20	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	20	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
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	1,136	3,248
Other Residential | Real estate loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	404	364
Other Residential | Real estate loans: | One-to-four family:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	321	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	83	0
Other Residential | Consumer loans:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	732	2,884
Other Residential | Consumer loans: | Manufactured homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	476	521
Other Residential | Consumer loans: | Floating homes:
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans		2,363
Other Residential | Consumer loans: | Other consumer
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	256	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	6	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	6	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
RVs/Automobiles | Consumer loans: | Other consumer
Financing Receivable, Allowance For Credit Losses [Line Items]
Total loans	6	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
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