Loans Held for Investment - Schedule of Past Due Status of Loans Held for Investment, Gross (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2022	Jun. 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans deemed uncollectible, period of delinquency	90 days	90 days
Non-accrual	$ 1,048	$ 1,508
Total loans held for investment, gross	991,401	937,970
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	990,352	936,459
30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	1	3
Mortgage loans, Single-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,048	1,508
Total loans held for investment, gross	429,575	378,234
Mortgage loans, Single-family \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	428,527	376,726
Mortgage loans, Single-family \| 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	0	0
Mortgage Loans, Multi Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Total loans held for investment, gross	468,031	464,676
Mortgage Loans, Multi Family \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	468,031	464,676
Mortgage Loans, Multi Family \| 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	0	0
Mortgage loans, Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Total loans held for investment, gross	89,339	90,429
Mortgage loans, Commercial real estate \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	89,339	90,429
Mortgage loans, Commercial real estate \| 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	0	0
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Total loans held for investment, gross	3,151	3,216
Construction \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	3,151	3,216
Construction \| 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	0	0
Mortgage Loans Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Total loans held for investment, gross	118	123
Mortgage Loans Other \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	118	123
Mortgage Loans Other \| 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	0	0
Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Total loans held for investment, gross	1,117	1,206
Commercial business loans \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	1,117	1,206
Commercial business loans \| 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	0	0
Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Total loans held for investment, gross	70	86
Consumer loans \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	69	83
Consumer loans \| 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment, gross	$ 1	$ 3
Bankruptcy [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans deemed uncollectible, period of delinquency	60 days
Troubled Debt Restructurings [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans deemed uncollectible, period of delinquency	90 days
Commercial Real Estate Or Second Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans deemed uncollectible, period of delinquency	120 days

Loan Deemed Uncollectible, Period of Delinquency

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable classified as noncurrent. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements.

+ References

No definition available.

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