Loans Held for Investment - Additional Information (Details)	12 Months Ended
Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan
Fixed-rate loans as a percentage of total loans held for investment	1.00%	2.00%
Loans deemed uncollectible, period of delinquency	90 days
Loans held for investment	$ 904,466,000	$ 881,338,000
Loan interest income added to negative amortization loan balance	0
Loans and Leases Receivable, Impaired, Commitment to Lend	0.000	0.000
Interest income, non-performing loans, cash basis	312,000	574,000
Interest lost on non-performing Loans	109,000	166,000
Average investment in non-performing loans	4,400,000	6,600,000
Loans receivable, modified and extended beyond initial maturity	$ 0	$ 56,000
Number of modified loans \| loan	2	0
Restructed Loans, Number of Loans Paid off \| loan	2	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| loan	0	0
Loans receivable, restructured loans, nonaccrual status	$ 0	$ 1,861,000
Restructured loans on non-accrual status	$ 2,643,000	1,932,000
First Trust Deed Loans
Loans deemed uncollectible, period of delinquency	150 days
Mortgage loans, Single-family
Loans receivable, restructured loans, nonaccrual status	$ 0	1,861,000
Restructured loans on non-accrual status	2,612,000	1,891,000
Commercial business loans
Restructured loans on non-accrual status	$ 31,000	41,000
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	$ 1,200,000
Commercial Real Estate Or Second Mortgage [Member]
Loans deemed uncollectible, period of delinquency	120 days
Restructured loans on accrual status
Loans held for investment		3,800,000
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	$ 5,783,000	8,141,000
Number of modified loans \| loan	8
Substandard \| Restructured loans on accrual status
Loans held for investment	$ 2,600,000	$ 1,400,000
Number of modified loans \| loan		1
Substandard \| Restructured loans on non-accrual status
Loans held for investment		$ 1,900,000
Number of modified loans \| loan		6
Pass
Loans held for investment	$ 890,083,000	$ 864,611,000
Number of modified loans \| loan	1	3
Special Mention
Loans held for investment	$ 8,600,000	$ 8,586,000
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	44.00%	44.00%
Interest income
Interest income, non-performing loans, cash basis	$ 203,000	$ 408,000
Construction [Member]
Interest income, non-performing loans, cash basis		$ 1,000,000

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 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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