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
Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period		$ 5,946
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 7,065
(Recovery of) provision for credit losses	(736)	536
ACL, end of period	6,329	7,679
Allowance for credit losses: Individually evaluated for impairment		37
Allowance for credit losses: Collectively evaluated for impairment	6,329	7,642
Loans held for investment: Individually evaluated for allowances	732	990
Loans held for investment: Collectively evaluated for allowances	1,044,935	1,069,478
Total loans held for investment, gross	$ 1,045,667	$ 1,070,468	$ 1,050,846
ACL on loans as a percentage of gross loans held for investment	0.61%	0.72%
ASC 326 \| Impact of ASU adoption
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, end of period		$ 1,197
Mortgage loans \| Single-family
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period		1,720
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 6,295
(Recovery of) provision for credit losses	(616)	550
ACL, end of period	5,679	6,875
Allowance for credit losses: Individually evaluated for impairment		37
Allowance for credit losses: Collectively evaluated for impairment	5,679	6,838
Loans held for investment: Individually evaluated for allowances	732	990
Loans held for investment: Collectively evaluated for allowances	523,503	520,586
Total loans held for investment, gross	$ 524,235	$ 521,576	518,091
ACL on loans as a percentage of gross loans held for investment	1.08%	1.32%
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
Mortgage loans \| Multi-family
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period		3,270
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 595
(Recovery of) provision for credit losses	(92)	3
ACL, end of period	503	659
Allowance for credit losses: Collectively evaluated for impairment	503	659
Loans held for investment: Collectively evaluated for allowances	435,782	457,351
Total loans held for investment, gross	$ 435,782	$ 457,351	445,182
ACL on loans as a percentage of gross loans held for investment	0.12%	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)
Mortgage loans \| Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period		868
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 66
(Recovery of) provision for credit losses	(8)	(6)
ACL, end of period	58	76
Allowance for credit losses: Collectively evaluated for impairment	58	76
Loans held for investment: Collectively evaluated for allowances	81,169	87,954
Total loans held for investment, gross	$ 81,169	$ 87,954	83,349
ACL on loans as a percentage of gross loans held for investment	0.07%	0.09%
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)
Mortgage loans \| Construction
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period		15
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 97
(Recovery of) provision for credit losses	(19)	(8)
ACL, end of period	78	54
Allowance for credit losses: Collectively evaluated for impairment	78	54
Loans held for investment: Collectively evaluated for allowances	2,816	2,100
Total loans held for investment, gross	$ 2,816	$ 2,100	2,692
ACL on loans as a percentage of gross loans held for investment	2.77%	2.57%
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
Mortgage loans \| Other
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period		2
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 1
(Recovery of) provision for credit losses		(1)
ACL, end of period	1	4
Allowance for credit losses: Collectively evaluated for impairment	1	4
Loans held for investment: Collectively evaluated for allowances	92	104
Total loans held for investment, gross	$ 92	$ 104	95
ACL on loans as a percentage of gross loans held for investment	1.09%	3.85%
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
Commercial business loans
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period		67
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
ACL, beginning of period	$ 11
(Recovery of) provision for credit losses	(1)	(2)
ACL, end of period	10	11
Allowance for credit losses: Collectively evaluated for impairment	10	11
Loans held for investment: Collectively evaluated for allowances	1,510	1,321
Total loans held for investment, gross	$ 1,510	$ 1,321	1,372
ACL on loans as a percentage of gross loans held for investment	0.66%	0.83%
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)
Consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period		4
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loans held for investment: Collectively evaluated for allowances	$ 63	62
Total loans held for investment, gross	$ 63	62	$ 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)

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

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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
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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.

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

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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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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
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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