Loans Receivable Held for Investment, Activity in Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		$ 6,970		$ 2,962	$ 4,388	[1]	$ 3,391
Charge-offs		0		0	0		0
Recoveries		0		0	0		0
Provision (recapture)		(71)	[2]	1,021	702	[2]	592
Ending balance		6,899	[1]	3,983	6,899	[1]	3,983
Provision for off balance sheet loan commitments		69			106
(Recapture of) provision for credit losses		(2)		1,021	808		592
Real Estate [Member] | Single Family [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		247		120	109		145
Charge-offs		0		0	0		0
Recoveries		0		0	0		0
Provision (recapture)		(6)	[2]	(8)	(82)	[2]	(33)
Ending balance		241		112	241		112
Real Estate [Member] | Multi-Family [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		4,255		2,278	3,273		2,657
Charge-offs		0		0	0		0
Recoveries		0		0	0		0
Provision (recapture)		(8)	[2]	641	371	[2]	262
Ending balance		4,247		2,919	4,247		2,919
Real Estate [Member] | Commercial Real Estate [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		1,012		153	449		236
Charge-offs		0		0	0		0
Recoveries		0		0	0		0
Provision (recapture)		9	[2]	142	106	[2]	59
Ending balance		1,021		295	1,021		295
Real Estate [Member] | Church [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		83		48	65		103
Charge-offs		0		0	0		0
Recoveries		0		0	0		0
Provision (recapture)		(4)	[2]	6	(23)	[2]	(49)
Ending balance		79		54	79		54
Real Estate [Member] | Construction [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		788		221	313		212
Charge-offs		0		0	0		0
Recoveries		0		0	0		0
Provision (recapture)		59	[2]	187	315	[2]	196
Ending balance		847		408	847		408
Commercial - Other [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		546		138	175		23
Charge-offs		0		0	0		0
Recoveries		0		0	0		0
Provision (recapture)		(121)	[2]	53	(4)	[2]	168
Ending balance		425		191	425		191
SBA Loans [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		39			0
Charge-offs		0			0
Recoveries		0			0
Provision (recapture)	[2]	0			19
Ending balance		39			39
Consumer [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance		0		4	4		15
Charge-offs		0		0	0		0
Recoveries		0		0	0		0
Provision (recapture)		0	[2]	0	0	[2]	(11)
Ending balance		$ 0		$ 4	0		$ 4
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					1,809
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate [Member] | Single Family [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					214
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate [Member] | Multi-Family [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					603
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate [Member] | Commercial Real Estate [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					466
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate [Member] | Church [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					37
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Real Estate [Member] | Construction [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					219
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Commercial - Other [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					254
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | SBA Loans [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					20
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member] | Consumer [Member]
Allowance for Credit Losses on Loans [Roll Forward]
Beginning balance					$ (4)

[1] The allowance for credit losses as of December 31, 2022 was accounted for under ASC 450 and ASC 310, which is reflective of probable incurred losses as of the date of the consolidated statement of financial condition. Effective January 1, 2023, the allowance for credit losses is accounted for under ASC 326, which is reflective of estimated expected lifetime credit losses.

[2] The bank also recorded a provision for off-balance sheet loan commitments of $69 thousand for the three months ended September 30, 2023 and $106 thousand for the nine months ended September 30, 2023.