Loans Receivable and Allowance for Credit Losses - Schedule of Allowance for Loan and Lease Losses, Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			$ 15,227
Provision (recapture)	$ (300)		(208)
Ending balance	15,306		15,306
One-to-Four Family Residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,574	$ 3,692	4,043	$ 3,214
Charge-offs			0	0
Recoveries		(1)	(1)	(6)
Provision (recapture)	172	109	182	582
Ending balance	5,746	3,802	5,746	3,802
Total Loans		449,435		449,435
Loans collectively evaluated for impairment		447,571		447,571
Loans individually evaluated for impairment		1,864		1,864
One-to-Four Family Residential | General Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		3,787		3,787
One-to-Four Family Residential | Specific Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		15		15
One-to-Four Family Residential | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,520
Multifamily
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,582	1,296	1,210	1,279
Charge-offs			0	0
Recoveries		0	0	0
Provision (recapture)	(15)	(30)	274	(13)
Ending balance	1,567	1,266	1,567	1,266
Total Loans		132,755		132,755
Loans collectively evaluated for impairment		131,113		131,113
Loans individually evaluated for impairment		1,642		1,642
Multifamily | General Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		1,266		1,266
Multifamily | Specific Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		0		0
Multifamily | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			83
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,367	6,187	5,397	6,615
Charge-offs			0	0
Recoveries		0	0	0
Provision (recapture)	(430)	(789)	(490)	(1,217)
Ending balance	3,937	5,398	3,937	5,398
Total Loans		413,486		413,486
Loans collectively evaluated for impairment		367,673		367,673
Loans individually evaluated for impairment		45,813		45,813
Commercial real estate | General Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		5,398		5,398
Commercial real estate | Specific Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		0		0
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(970)
Construction Land Development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,664	1,357	1,717	2,064
Charge-offs			0	0
Recoveries		0	0	0
Provision (recapture)	(24)	176	(485)	(531)
Ending balance	1,640	1,533	1,640	1,533
Total Loans		72,624		72,624
Loans collectively evaluated for impairment		72,624		72,624
Loans individually evaluated for impairment		0		0
Construction Land Development | General Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		1,533		1,533
Construction Land Development | Specific Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		0		0
Construction Land Development | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			408
Business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	347	998	948	1,112
Charge-offs			0	0
Recoveries		0	0	0
Provision (recapture)	10	(41)	(81)	(155)
Ending balance	357	957	357	957
Total Loans		32,054		32,054
Loans collectively evaluated for impairment		32,054		32,054
Loans individually evaluated for impairment		0		0
Business | General Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		957		957
Business | Specific Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		0		0
Business | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(510)
Prior
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,072	1,595	1,912	1,373
Charge-offs			(22)	(37)
Recoveries		0	0	0
Provision (recapture)	(13)	175	200	434
Ending balance	2,059	1,770	2,059	1,770
Total Loans		57,619		57,619
Loans collectively evaluated for impairment		57,619		57,619
Loans individually evaluated for impairment		0		0
Prior | General Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		1,770		1,770
Prior | Specific Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		0		0
Prior | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			(31)
Property total
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	15,606	15,125	15,227	15,657
Charge-offs			(22)	(37)
Recoveries		(1)	(1)	(6)
Provision (recapture)	(300)	(400)	(400)	(900)
Ending balance	$ 15,306	14,726	15,306	14,726
Total Loans		1,157,973		1,157,973
Loans collectively evaluated for impairment		1,108,654		1,108,654
Loans individually evaluated for impairment		49,319		49,319
Property total | General Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		14,711		14,711
Property total | Specific Allowance
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance		$ 15		$ 15
Property total | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			$ 500