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	6 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 6,329	$ 7,679	$ 7,065	$ 5,946
Provision for (Recovery of) credit losses	627	(679)	(109)	(143)
ACL, end of period	6,956	7,000	6,956	7,000
Allowance for credit losses: Individually evaluated for impairment		37		37
Allowance for credit losses: Collectively evaluated for impairment	6,956	6,963	6,956	6,963
Loans held for investment: Individually evaluated for allowances	742	810	742	810
Loans held for investment: Collectively evaluated for allowances	1,050,106	1,072,596	1,050,106	1,072,596
Total loans held for investment	$ 1,050,848	$ 1,073,406	$ 1,050,848	$ 1,073,406	$ 1,050,846
ACL on loans as a percentage of gross loans held for investment	0.66%	0.65%	0.66%	0.65%
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	$ 5,679	6,875	$ 6,295	1,720
Provision for (Recovery of) credit losses	582	(640)	(34)	(90)
ACL, end of period	6,261	6,235	6,261	6,235
Allowance for credit losses: Individually evaluated for impairment		37		37
Allowance for credit losses: Collectively evaluated for impairment	6,261	6,198	6,261	6,198
Loans held for investment: Individually evaluated for allowances	742	810	742	810
Loans held for investment: Collectively evaluated for allowances	532,398	521,134	532,398	521,134
Total loans held for investment	$ 533,140	$ 521,944	$ 533,140	$ 521,944	518,091
ACL on loans as a percentage of gross loans held for investment	1.17%	1.19%	1.17%	1.19%
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	$ 503	659	$ 595	3,270
Provision for (Recovery of) credit losses	46	(17)	(46)	(14)
ACL, end of period	549	642	549	642
Allowance for credit losses: Collectively evaluated for impairment	549	642	549	642
Loans held for investment: Collectively evaluated for allowances	433,724	458,502	433,724	458,502
Total loans held for investment	$ 433,724	$ 458,502	$ 433,724	$ 458,502	445,182
ACL on loans as a percentage of gross loans held for investment	0.13%	0.14%	0.13%	0.14%
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	$ 58	76	$ 66	868
Provision for (Recovery of) credit losses	1	(3)	(7)	(9)
ACL, end of period	59	73	59	73
Allowance for credit losses: Collectively evaluated for impairment	59	73	59	73
Loans held for investment: Collectively evaluated for allowances	77,984	88,640	77,984	88,640
Total loans held for investment	$ 77,984	$ 88,640	$ 77,984	$ 88,640	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	$ 78	54	$ 97	15
Provision for (Recovery of) credit losses	(30)	(18)	(49)	(26)
ACL, end of period	48	36	48	36
Allowance for credit losses: Collectively evaluated for impairment	48	36	48	36
Loans held for investment: Collectively evaluated for allowances	1,480	2,534	1,480	2,534
Total loans held for investment	$ 1,480	$ 2,534	$ 1,480	$ 2,534	2,692
ACL on loans as a percentage of gross loans held for investment	3.24%	1.42%	3.24%	1.42%
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	$ 1	4	$ 1	2
Provision for (Recovery of) credit losses	1	(2)	1	(3)
ACL, end of period	2	2	2	2
Allowance for credit losses: Collectively evaluated for impairment	2	2	2	2
Loans held for investment: Collectively evaluated for allowances	90	102	90	102
Total loans held for investment	$ 90	$ 102	$ 90	$ 102	95
ACL on loans as a percentage of gross loans held for investment	2.22%	1.96%	2.22%	1.96%
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	$ 10	11	$ 11	67
Provision for (Recovery of) credit losses	27	1	26	(1)
ACL, end of period	37	12	37	12
Allowance for credit losses: Collectively evaluated for impairment	37	12	37	12
Loans held for investment: Collectively evaluated for allowances	4,371	1,616	4,371	1,616
Total loans held for investment	$ 4,371	$ 1,616	$ 4,371	$ 1,616	1,372
ACL on loans as a percentage of gross loans held for investment	0.85%	0.74%	0.85%	0.74%
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	$ 59	68	$ 59	68
Total loans held for investment	$ 59	68	$ 59	68	$ 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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-Section 50
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Name Accounting Standards Codification
-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

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

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