Loans - Schedule of Composition of the Loan Portfolio, Excluding Loans Held-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	$ 911,953		$ 901,827
Premiums for purchased loans	644		718
Deferred fees, net	(2,882)		(2,374)
Total	909,715		900,171
Allowance for credit losses — loans	(8,564)	$ (8,536)	(8,499)	$ (8,585)	$ (8,493)	$ (8,760)
Total loans held-for-portfolio, net	901,151		891,672
Real estate loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	749,299		740,963
Real estate loans: | One-to-four family:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	257,797		269,684
Premiums for purchased loans	373		404
Total	257,850		269,809
Allowance for credit losses — loans	(3,280)	(3,327)	(3,025)	(2,812)	(2,798)	(2,630)
Real estate loans: | Home equity:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	29,903		26,686
Total	30,126		26,896
Allowance for credit losses — loans	(354)	(360)	(307)	(214)	(199)	(185)
Real estate loans: | Commercial and multifamily:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	408,802		371,516
Premiums for purchased loans	220		244
Total	407,132		370,282
Allowance for credit losses — loans	(1,310)	(1,236)	(1,218)	(1,285)	(1,130)	(1,070)
Real estate loans: | Construction and land:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	52,797		73,077
Total	52,455		72,812
Allowance for credit losses — loans	(333)	(269)	(992)	(770)	(1,072)	(1,349)
Consumer loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	148,440		145,259
Consumer loans: | Manufactured homes:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	42,735		41,128
Total	42,601		40,980
Allowance for credit losses — loans	(1,379)	(1,395)	(1,172)	(991)	(938)	(971)
Consumer loans: | Floating homes:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	88,674		86,411
Total	88,247		85,990
Allowance for credit losses — loans	(1,363)	(1,410)	(1,282)	(2,060)	(1,910)	(2,022)
Consumer loans: | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	17,031		17,720
Total	17,058		17,738
Allowance for credit losses — loans	(440)	(451)	(401)	(357)	(348)	(426)
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held-for-portfolio	14,214		15,605
Premiums for purchased loans	51		70
Total	14,246		15,664
Allowance for credit losses — loans	$ (105)	$ (88)	$ (102)	$ (96)	$ (98)	$ (107)