Loans Held for Investment - Schedule of Allowance For Credit Losses and Recorded Investment in Gross Loans, by Portfolio Type (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 6,956	$ 7,000	$ 7,065	$ 5,946
(Recovery of) provision for credit losses	(379)	108	(488)	(35)
ACL, end of period	6,577	7,108	6,577	7,108
Allowance for credit losses: Individually evaluated for impairment		37		37
Allowance for credit losses: Collectively evaluated for impairment	6,577	7,071	6,577	7,071
Loans held for investment: Individually evaluated for allowances	479	1,138	479	1,138
Loans held for investment: Collectively evaluated for allowances	1,055,027	1,062,177	1,055,027	1,062,177
Total loans held for investment	$ 1,055,506	$ 1,063,315	$ 1,055,506	$ 1,063,315	$ 1,050,846
ACL on loans as a percentage of gross loans held for investment	0.62%	0.67%	0.62%	0.67%
ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ 1,197		$ 1,197
Mortgage loans \| Single-family
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 6,261	6,235	$ 6,295	1,720
(Recovery of) provision for credit losses	(460)	136	(494)	46
ACL, end of period	5,801	6,371	5,801	6,371
Allowance for credit losses: Individually evaluated for impairment		37		37
Allowance for credit losses: Collectively evaluated for impairment	5,801	6,334	5,801	6,334
Loans held for investment: Individually evaluated for allowances	9	1,138	9	1,138
Loans held for investment: Collectively evaluated for allowances	545,368	515,901	545,368	515,901
Total loans held for investment	$ 545,377	$ 517,039	$ 545,377	$ 517,039	518,091
ACL on loans as a percentage of gross loans held for investment	1.06%	1.23%	1.06%	1.23%
Mortgage loans \| Single-family \| ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ 4,605		$ 4,605
Mortgage loans \| Multi-family
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 549	642	$ 595	3,270
(Recovery of) provision for credit losses	126	(41)	80	(55)
ACL, end of period	675	601	675	601
Allowance for credit losses: Collectively evaluated for impairment	675	601	675	601
Loans held for investment: Individually evaluated for allowances	470		470
Loans held for investment: Collectively evaluated for allowances	429,077	457,401	429,077	457,401
Total loans held for investment	$ 429,547	$ 457,401	$ 429,547	$ 457,401	445,182
ACL on loans as a percentage of gross loans held for investment	0.16%	0.13%	0.16%	0.13%
Mortgage loans \| Multi-family \| ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ (2,614)		$ (2,614)
Mortgage loans \| Commercial real estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 59	73	$ 66	868
(Recovery of) provision for credit losses	(1)	(8)	(8)	(17)
ACL, end of period	58	65	58	65
Allowance for credit losses: Collectively evaluated for impairment	58	65	58	65
Loans held for investment: Collectively evaluated for allowances	75,349	83,136	75,349	83,136
Total loans held for investment	$ 75,349	$ 83,136	$ 75,349	$ 83,136	83,349
ACL on loans as a percentage of gross loans held for investment	0.08%	0.08%	0.08%	0.08%
Mortgage loans \| Commercial real estate \| ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ (786)		$ (786)
Mortgage loans \| Construction
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 48	36	$ 97	15
(Recovery of) provision for credit losses	(35)	8	(84)	(18)
ACL, end of period	13	44	13	44
Allowance for credit losses: Collectively evaluated for impairment	13	44	13	44
Loans held for investment: Collectively evaluated for allowances	837	2,745	837	2,745
Total loans held for investment	$ 837	$ 2,745	$ 837	$ 2,745	2,692
ACL on loans as a percentage of gross loans held for investment	1.55%	1.60%	1.55%	1.60%
Mortgage loans \| Construction \| ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ 47		$ 47
Mortgage loans \| Other
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 2	2	$ 1	2
(Recovery of) provision for credit losses	(1)	(1)		(4)
ACL, end of period	1	1	1	1
Allowance for credit losses: Collectively evaluated for impairment	1	1	1	1
Loans held for investment: Collectively evaluated for allowances	89	99	89	99
Total loans held for investment	$ 89	$ 99	$ 89	$ 99	95
ACL on loans as a percentage of gross loans held for investment	1.12%	1.01%	1.12%	1.01%
Mortgage loans \| Other \| ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ 3		$ 3
Commercial business loans
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 37	12	$ 11	67
(Recovery of) provision for credit losses	(8)	14	18	13
ACL, end of period	29	26	29	26
Allowance for credit losses: Collectively evaluated for impairment	29	26	29	26
Loans held for investment: Collectively evaluated for allowances	4,255	2,835	4,255	2,835
Total loans held for investment	$ 4,255	$ 2,835	$ 4,255	$ 2,835	1,372
ACL on loans as a percentage of gross loans held for investment	0.68%	0.92%	0.68%	0.92%
Commercial business loans \| ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ (54)		$ (54)
Consumer loans
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period				4
Loans held for investment: Collectively evaluated for allowances	$ 52	60	$ 52	60
Total loans held for investment	$ 52	60	$ 52	60	$ 65
Consumer loans \| ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ (4)		$ (4)

Represents amount of allowance for loan losses as a percentage of gross loans-held for investment.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

Amount of allowance for credit loss on financing receivable evaluated on collective basis. Excludes financing receivable evaluated on individual basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
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-Publisher FASB
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-Topic 310
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-Section 50
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Section 30
-Paragraph 2
-Publisher FASB
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- Definition

Amount of allowance for credit loss on financing receivable evaluated on individual basis. Excludes financing receivable evaluated on collective basis.

+ References

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Amount of financing receivable collectively evaluated for credit loss. Excludes financing receivable individually evaluated for credit loss.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
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-Publisher FASB
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- Definition

Amount of financing receivable individually evaluated for credit loss. Excludes financing receivable collectively evaluated for credit loss.

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