Loans Held for Investment - Additional Information (Details)	12 Months Ended
Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan
Fixed-rate loans as a percentage of total loans held for investment	4.00%	1.00%
Loans deemed uncollectible, period of delinquency	90 days	90 days
Loans held for investment	$ 852,082,000	$ 904,466,000
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
Interest income, non-performing loans, cash basis	209,000	312,000
Interest received to reduce the loan balances under the cost recovery method	53,000	109,000
Average investment in non-performing loans	9,100,000	$ 4,400,000
Loans receivable, modified and extended beyond initial maturity	$ 4,700,000
Number of forbearance loans \| loan	4
Amount of loan forbearance	$ 1,800,000
Total loans were modified	0.22%
Number of modified loans \| loan	20	2
Number of loans downgraded \| loan		1
Restructured Loans, Number of Loans Paid off \| loan	3	2
Number of loans converted into real estate owned \| loan	0	0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| loan	0	0
Number of loans modified, extended beyond initial maturity \| loan	12	0
Number of loans restructured loans not classified as substandard on non accrual status \| loan	3
Restructured loans not classified as substandard on non accrual status	$ 876,000
Loans receivable, restructured loans, nonaccrual status	876,000
Restructured loans on non-accrual status	$ 6,983,000	$ 2,643,000
First Trust Deed Loans
Loans deemed uncollectible, period of delinquency	150 days
Mortgage loans, Single-family
Loans receivable, restructured loans, nonaccrual status	$ 876,000
Restructured loans on non-accrual status	6,983,000	2,612,000
Commercial business loans
Restructured loans on non-accrual status	$ 0	31,000
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	$ 7,700,000
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	$ 9,407,000	5,783,000
Number of modified loans \| loan	23
Substandard \| Restructured loans on accrual status
Loans held for investment		$ 1,400,000
Number of modified loans \| loan		1
Substandard \| Restructured loans on non-accrual status
Loans held for investment	$ 7,900,000	$ 1,900,000
Number of modified loans \| loan		6
Pass
Loans held for investment	$ 840,908,000	$ 890,083,000
Number of loans upgraded \| loan	2	1
Special Mention
Loans held for investment	$ 1,767,000	$ 8,600,000
Special Mention \| Restructured loans on accrual status
Loans held for investment		$ 437,000
Number of modified loans \| loan		1
Current
Loans held for investment		$ 1,200,000
Number of modified loans \| loan		8
Percent of total restructured loans on current status	97.00%	44.00%
Interest income
Interest income, non-performing loans, cash basis	$ 156,000	$ 203,000
Mortgage loans, Single-family
Loans held for investment	268,272,000	298,810,000
Mortgage loans, Single-family \| Substandard
Loans held for investment	8,288,000	5,748,000
Mortgage loans, Single-family \| Pass
Loans held for investment	258,217,000	289,942,000
Mortgage loans, Single-family \| Special Mention
Loans held for investment	1,767,000	3,120,000
Mortgage Loans, Multi Family
Loans held for investment	484,408,000	491,903,000
Mortgage Loans, Multi Family \| Substandard
Loans held for investment	1,119,000	0
Mortgage Loans, Multi Family \| Pass
Loans held for investment	483,289,000	488,126,000
Mortgage Loans, Multi Family \| Special Mention
Loans held for investment	$ 0	$ 3,777,000

Allowance for Loan Losses, Pooling Method, Period of Delinquency

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Number of loans restructured loans not classified as substandard on non accrual status.

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The amount of restructured loans not classified as substandard on non accrual status.

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Fixed Rate Loans as a Percentage of Total Loans

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Number of loans converted into real estate owned.

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percent of total loans that were modified .

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

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

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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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