Loans Held for Investment - Additional Information (Details)	12 Months Ended
Jun. 30, 2022 USD ($) loan	Jun. 30, 2021 USD ($) loan
Fixed-rate loans as a percentage of total loans held for investment	11.00%	4.00%
Loans deemed uncollectible, period of delinquency	90 days	90 days
Restructured loans amount	$ 4,470,000	$ 7,859,000
Loans held for investment	937,970,000	$ 852,082,000
Payment deferral extension term		6 months
Loan interest income added to negative amortization loan balance	0
Loans and Leases Receivable, Impaired, Commitment to Lend	0	$ 0
Non-performing loans received	405,000	209,000
Non-performing loans interest recognized as principal payments, cost basis	29,000	53,000
Interest income, non-performing loans, cash basis	376,000	156,000
Average investment in non-performing loans	$ 4,186,000	9,090,000
Loans receivable, modified and extended beyond initial maturity		$ 4,700,000
Number of loans newly restructured \| loan	0
Number of Covid-19 related loans newly restructured \| loan		19
Number of forbearance loans \| loan	0
Number of modified loans \| loan	13	23
Restructured Loans, Number of Loans Paid off \| loan	7	3
Number of loans converted into real estate owned \| loan	0	0
Number of restructured loans \| loan	0	0
Number of loans modified, extended beyond initial maturity \| loan	0	12
Restructured loans on non-accrual status	$ 1,508,000	$ 9,407,000
Number of loans paid off which is extended beyond forbearance \| loan	5
Amount of loans paid off which is extended beyond forbearance	$ 2,200,000
Number of loans nonperforming which is extended beyond initial forbearance \| loan	1
Amount of loans nonperforming which is extended beyond initial forbearance	$ 760,000
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
Interest income, non-performing loans, cash basis	330,000	140,000
Average investment in non-performing loans	3,229,000	8,703,000
Restructured loans on non-accrual status	1,508,000	8,288,000
Commercial business loans
Interest income, non-performing loans, cash basis		1,000
Average investment in non-performing loans		13,000
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
Commercial Real Estate Or Second Mortgage [Member]
Loans deemed uncollectible, period of delinquency	120 days
Restructured loans on non-accrual status
Number of modified loans \| loan		20
Maximum
Segregated restructured loans, period of delinquency	90 days
Maximum \| Bankruptcy [Member]
Allowance for loan losses, pooling method, period of delinquency	60 days
Substandard
Restructured loans amount	$ 722,000	$ 7,000,000.0
Loans held for investment	$ 1,508,000	$ 9,407,000
Number of modified loans \| loan	1	20
Pass
Restructured loans amount		$ 876,000
Loans held for investment	$ 936,238,000	$ 840,908,000
Number of modified loans \| loan		3
Number of loans upgraded \| loan	3	2
Number of loans upgraded which is extended beyond initial forbearance \| loan	13
Amount of loans upgraded which is extended beyond initial forbearance	$ 3,900,000
Special Mention
Loans held for investment	224,000	$ 1,767,000
Current Payment Status
Restructured loans amount		$ 7,700,000
Percent of total restructured loans on current status		97.00%
Mortgage loans, Single-family
Loans held for investment	378,234,000	$ 268,272,000
Mortgage loans, Single-family \| Substandard
Loans held for investment	1,508,000	8,288,000
Mortgage loans, Single-family \| Pass
Loans held for investment	376,502,000	258,217,000
Mortgage loans, Single-family \| Special Mention
Loans held for investment	224,000	1,767,000
Mortgage Loans, Multi Family
Loans held for investment	464,676,000	484,408,000
Mortgage Loans, Multi Family \| Substandard
Loans held for investment	0	1,119,000
Mortgage Loans, Multi Family \| Pass
Loans held for investment	464,676,000	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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Number of forbearance loans.

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Amount of loans whose forbearance by the entity pursuant to COVID-19 hardship requests, is subsequently extended beyond initial forbearance and remain as nonperforming.

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Amount of loans whose forbearance by the entity pursuant to COVID-19 hardship requests, is subsequently extended beyond initial forbearance and paid off.

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Amount of loans whose forbearance by the entity pursuant to COVID-19 hardship requests, is subsequently extended beyond initial forbearance and upgraded.

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Fixed Rate Loans as a Percentage of Total Loans

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Total payments received on non performing loans using the cost basis method.

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Total interest payments received on non performing loans that was recognized as principal payments using the cost basis method.

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Number of loans converted into real estate owned.

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The number of loans which is subsequently extended beyond initial forbearance were nonperforming.

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Amount, after troubled debt restructuring, of modified financing receivable.

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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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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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Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

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