Loans Held for Investment - Additional Information (Details)	3 Months Ended	12 Months Ended
Sep. 30, 2022 USD ($) loan property	Sep. 30, 2021 USD ($) property	Jun. 30, 2022 USD ($) loan
Fixed-rate loans as a percentage of total loans held for investment	11.00%		11.00%
Loans deemed uncollectible, period of delinquency	90 days		90 days
Restructured loans amount	$ 2,627,000		$ 4,470,000
Loans held for investment	991,401,000		$ 937,970,000
Total interest payments received	7,000	$ 211,000
Non-performing loans interest recognized as principal payments, cost basis	2,000	9,000
Interest income, non-performing loans, cash basis	5,000	202,000
Average investment in non-performing loans	$ 1,118,000	$ 7,758,000
Number of loans newly restructured	0	1
Number of modified loans \| loan	9		13
Number of restructured loans	0	0
Restructured loans on non-accrual status	$ 1,048,000		$ 1,508,000
Number of Properties Acquired in Settlement of Loans \| property	0	0
Number of Previously Foreclosed Properties Sold \| property	0	0
First Trust Deed Loans
Loans deemed uncollectible, period of delinquency	150 days
Mortgage loans, Commercial real estate
Restructured loans on non-accrual status	$ 0		0
Mortgage loans, Single-family
Restructured loans on non-accrual status	1,048,000		1,508,000
Commercial business loans
Restructured loans on non-accrual status	$ 0		0
Bankruptcy [Member]
Loans deemed uncollectible, period of delinquency	60 days
Troubled Debt Restructurings [Member]
Loans deemed uncollectible, period of delinquency	90 days
Loans held for investment			4,500,000
Commercial Real Estate Or Second Mortgage [Member]
Loans deemed uncollectible, period of delinquency	120 days
Restructured loans on accrual status
Loans held for investment	$ 2,600,000
Maximum
Segregated restructured loans, period of delinquency	90 days
Maximum \| Bankruptcy [Member]
Allowance for loan losses, pooling method, period of delinquency	60 days
Substandard
Loans held for investment	$ 1,048,000		1,508,000
Substandard \| Restructured loans on non-accrual status
Loans held for investment	$ 721,000		$ 722,000,000,000
Number of modified loans \| loan	1		1
Pass
Loans held for investment	$ 990,353,000		$ 936,238,000
Special Mention
Loans held for investment			224,000
Number of loans downgraded \| loan	3
Restructured Loans, Number of Loans Paid off \| loan	1
Current Payment Status
Loans held for investment	$ 1,900,000		$ 4,500,000
Percent of total restructured loans on current status	73.00%		100.00%
Interest income
Interest income, non-performing loans, cash basis		$ 202,000
Mortgage loans, Single-family
Loans held for investment	$ 429,575,000		$ 378,234,000
Mortgage loans, Single-family \| Substandard
Loans held for investment	1,048,000		1,508,000
Mortgage loans, Single-family \| Pass
Loans held for investment	428,527,000		376,502,000
Mortgage loans, Single-family \| Special Mention
Loans held for investment			224,000
Mortgage Loans, Multi Family
Loans held for investment	468,031,000		464,676,000
Mortgage Loans, Multi Family \| Substandard
Loans held for investment	0		0
Mortgage Loans, Multi Family \| Pass
Loans held for investment	$ 468,031,000		464,676,000
Mortgage Loans, Multi Family \| Special Mention
Loans held for investment			$ 0

Allowance for Loan Losses, Pooling Method, Period of Delinquency

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Fixed Rate Loans as a Percentage of Total Loans

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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