Loans Held For Investment - Allowance Roll-forward (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2023	Sep. 30, 2022
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period	$ 5,946	$ 5,564
Provision for credit losses		70
Total recoveries		4
Net recoveries (charge-offs)		4
ACL, end of period		$ 5,638
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Provision for credit losses	536
Allowance at end of period	$ 7,679
ACL as a percentage of gross loans held for investment at the end of the period	0.72%	0.57%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period	0.00%	0.00%
ACL as a percentage of gross non-performing loans	545.38%	537.98%
Mortgage loans \| Single-family
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period	$ 1,720	$ 1,383
Provision for credit losses		63
Total recoveries		4
ACL, end of period		$ 1,450
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Provision for credit losses	550
Allowance at end of period	$ 6,875
ACL as a percentage of gross loans held for investment at the end of the period	1.32%	0.34%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period		(0.01%)
Impact to allowance after ASC 326 adoption
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period	$ 1,197
ACL, end of period	1,197
Impact to allowance after ASC 326 adoption \| Mortgage loans \| Single-family
Allowance for Loan and Lease Losses [Roll Forward]
ACL, beginning of the period	$ 4,605

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

No definition available.

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- Definition

Represents amount of allowance for loan losses as a percentage of gross non-performing loans

+ References

No definition available.

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- Definition

Net charge-offs (recoveries) as a percentage of average loans receivable, net, during the period (annualized).

+ References

No definition available.

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

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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

Amount, after recoveries, of loans and leases that have been written-off.

+ References

No definition available.

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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

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

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
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481696/310-30-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-SubTopic 10
-Topic 310
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 11B
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-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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-Name Accounting Standards Codification
-Section 50
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-Subparagraph (c)(2)
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-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

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-Topic 942
-SubTopic 220
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

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