Loans - Schedule of Composition of the Loan Portfolio, Excluding Loans Held-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	$ 906,207		$ 901,827
Premiums for purchased loans	662		718
Deferred fees, net	(2,583)		(2,374)
Total	904,286		900,171
Allowance for credit losses — loans	(8,536)	$ (8,393)	(8,499)	$ (8,493)	$ (8,598)	$ (8,760)
Total loans held-for-portfolio, net	895,750		891,672
Real estate loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	739,609		740,963
Real estate loans: | One-to-four family:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	262,672		269,684
Premiums for purchased loans	379		404
Total	262,742		269,809
Allowance for credit losses — loans	(3,327)	(3,328)	(3,025)	(2,798)	(2,910)	(2,630)
Real estate loans: | Home equity:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	28,582		26,686
Total	28,800		26,896
Allowance for credit losses — loans	(360)	(362)	(307)	(199)	(179)	(185)
Real estate loans: | Commercial and multifamily:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	398,429		371,516
Premiums for purchased loans	228		244
Total	397,119		370,282
Allowance for credit losses — loans	(1,236)	(1,181)	(1,218)	(1,130)	(1,106)	(1,070)
Real estate loans: | Construction and land:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	49,926		73,077
Total	49,560		72,812
Allowance for credit losses — loans	(269)	(279)	(992)	(1,072)	(1,329)	(1,349)
Consumer loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	151,819		145,259
Consumer loans: | Manufactured homes:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	43,112		41,128
Total	42,971		40,980
Allowance for credit losses — loans	(1,395)	(1,303)	(1,172)	(938)	(833)	(971)
Consumer loans: | Floating homes:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	91,448		86,411
Total	91,008		85,990
Allowance for credit losses — loans	(1,410)	(1,409)	(1,282)	(1,910)	(1,799)	(2,022)
Consumer loans: | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	17,259		17,720
Total	17,280		17,738
Allowance for credit losses — loans	(451)	(448)	(401)	(348)	(333)	(426)
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	14,779		15,605
Premiums for purchased loans	54		70
Total	14,806		15,664
Allowance for credit losses — loans	$ (88)	$ (83)	$ (102)	$ (98)	$ (109)	$ (107)