Loans Held for Investment - Additional Information (Details)	3 Months Ended	12 Months Ended
Sep. 30, 2021 USD ($) loan property	Sep. 30, 2020 USD ($) property loan	Jun. 30, 2021 USD ($) loan
Fixed-rate loans as a percentage of total loans held for investment	5.00%		4.00%
Loans deemed uncollectible, period of delinquency	90 days		90 days
Loans held for investment	$ 859,959,000		$ 852,082,000
Interest income, non-performing loans, cash basis	211,000	$ 50,000
Interest received to reduce the loan balances under the cost recovery method	9,000	9,000
Average investment in non-performing loans	$ 7,758,000	$ 5,425,000
Number of loans newly restructured	0	0
Total outstanding balance	$ 308,000
Total loans were modified	0.04%
Number of modified loans \| loan	22		23
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0	0
Number of loans modified, extended beyond initial maturity \| loan	0	0
Loans receivable, restructured loans, nonaccrual status	$ 2,773,000		$ 876,000
Restructured loans on non-accrual status	$ 5,102,000		6,983,000
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, Single-family
Loans receivable, restructured loans, nonaccrual status	$ 2,773,000		876,000
Restructured loans on non-accrual status	$ 5,102,000		6,983,000
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			7,900,000
Commercial Real Estate Or Second Mortgage [Member]
Loans deemed uncollectible, period of delinquency	120 days
Restructured loans on accrual status
Loans held for investment	$ 7,900,000
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	$ 7,250,000		9,407,000
Substandard \| Restructured loans on non-accrual status
Loans held for investment	5,100,000		7,000,000.0
Pass
Loans held for investment	$ 851,099,000		840,908,000
Number of loans upgraded \| loan	1	1
Special Mention
Loans held for investment	$ 1,610,000		1,767,000
Current
Loans held for investment	$ 6,700,000		$ 7,700,000
Percent of total restructured loans on current status	85.00%		97.00%
Interest income
Interest income, non-performing loans, cash basis	$ 202,000	$ 41,000
Mortgage loans, Single-family
Loans held for investment	274,970,000		$ 268,272,000
Number Of Loans subsequently extended	7,100,000
Mortgage loans, Single-family \| Substandard
Loans held for investment	6,140,000		8,288,000
Mortgage loans, Single-family \| Pass
Loans held for investment	267,220,000		258,217,000
Mortgage loans, Single-family \| Special Mention
Loans held for investment	1,610,000		1,767,000
Mortgage Loans, Multi Family
Loans held for investment	489,550,000		484,408,000
Mortgage Loans, Multi Family \| Substandard
Loans held for investment	1,110,000		1,119,000
Mortgage Loans, Multi Family \| Pass
Loans held for investment	488,440,000		483,289,000
Mortgage Loans, Multi Family \| Special Mention
Loans held for investment	$ 0		$ 0

Allowance for Loan Losses, Pooling Method, Period of Delinquency

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Financing Receivable, Modifications, Number of Contracts, Extending Beyond Initial Maturity

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Number of financing receivables that have been newly modified by troubled debt restructurings.

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Fixed Rate Loans as a Percentage of Total Loans

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Loan Deemed Uncollectible, Period of Delinquency

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Number of seven Loans forbearance with a total outstanding balance

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Number Of Loans subsequently extended were granted by the entity pursuant .

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percent of total loans that were modified .

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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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Amount of financing receivable on nonaccrual status.

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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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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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