Loans Held for Investment - Schedule of Allowance For Loan Losses and Recorded Investment in Gross Loans, by Portfolio Type (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 6,608	$ 8,538	$ 7,587	$ 8,265
(Recovery) provision for loan losses	(645)	(200)	(2,051)	59
Recoveries	6	9	433	24
Charge-offs	0	(1)	0	(2)
Net recoveries (charge-offs)	6	8	433	22
Allowance for loan losses, end of the year	5,969	8,346	5,969	8,346
Individually evaluated for impairment	51	572	51	572
Collectively evaluated for impairment	5,918	7,774	5,918	7,774
Individually evaluated for impairment	1,549	9,343	1,549	9,343
Collectively evaluated for impairment	890,902	832,650	890,902	832,650
Total Loans Held for Investment, Gross	$ 892,451	$ 841,993	$ 892,451	$ 841,993	$ 852,082
Allowance for loan losses as a percentage of gross loans held for investment	0.66%	0.98%	0.66%	0.98%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period (annualized)	0.00%	0.00%	(0.07%)	0.00%
Mortgage loans, Single-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 1,396	$ 2,706	$ 2,000	$ 2,622
(Recovery) provision for loan losses	(64)	(311)	(1,095)	(241)
Recoveries	6	9	433	23
Charge-offs	0	0	0
Allowance for loan losses, end of the year	1,338	2,404	1,338	2,404
Individually evaluated for impairment	51	572	51	572
Collectively evaluated for impairment	1,287	1,832	1,287	1,832
Individually evaluated for impairment	1,549	9,343	1,549	9,343
Collectively evaluated for impairment	326,112	245,050	326,112	245,050
Total Loans Held for Investment, Gross	$ 327,661	$ 254,393	$ 327,661	$ 254,393	268,272
Allowance for loan losses as a percentage of gross loans held for investment	0.41%	0.94%	0.41%	0.94%
Mortgage Loans, Multi Family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 4,219	$ 4,540	$ 4,485	$ 4,329
(Recovery) provision for loan losses	(544)	202	(810)	413
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	3,675	4,742	3,675	4,742
Collectively evaluated for impairment	3,675	4,742	3,675	4,742
Collectively evaluated for impairment	468,656	483,283	468,656	483,283
Total Loans Held for Investment, Gross	$ 468,656	$ 483,283	$ 468,656	$ 483,283	484,408
Allowance for loan losses as a percentage of gross loans held for investment	0.78%	0.98%	0.78%	0.98%
Mortgage loans, Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 915	$ 1,132	$ 1,006	$ 1,110
(Recovery) provision for loan losses	(45)	(30)	(136)	(8)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	870	1,102	870	1,102
Collectively evaluated for impairment	870	1,102	870	1,102
Collectively evaluated for impairment	91,344	99,722	91,344	99,722
Total Loans Held for Investment, Gross	$ 91,344	$ 99,722	$ 91,344	$ 99,722	95,279
Allowance for loan losses as a percentage of gross loans held for investment	0.95%	1.11%	0.95%	1.11%
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 55	$ 110	$ 51	$ 171
(Recovery) provision for loan losses	4	(57)	8	(118)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	59	53	59	53
Collectively evaluated for impairment	59	53	59	53
Collectively evaluated for impairment	4,127	3,508	4,127	3,508
Total Loans Held for Investment, Gross	$ 4,127	$ 3,508	$ 4,127	$ 3,508	3,040
Allowance for loan losses as a percentage of gross loans held for investment	1.43%	1.51%	1.43%	1.51%
Mortgage Loans Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 3	$ 3	$ 3	$ 3
(Recovery) provision for loan losses	0
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	3	3	3	3
Collectively evaluated for impairment	3	3	3	3
Collectively evaluated for impairment	131	140	131	140
Total Loans Held for Investment, Gross	$ 131	$ 140	$ 131	$ 140	139
Allowance for loan losses as a percentage of gross loans held for investment	2.29%	2.14%	2.29%	2.14%
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 15	$ 41	$ 36	$ 24
(Recovery) provision for loan losses	5	(5)	(16)	12
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	20	36	20	36
Collectively evaluated for impairment	20	36	20	36
Collectively evaluated for impairment	459	851	459	851
Total Loans Held for Investment, Gross	$ 459	$ 851	$ 459	$ 851	849
Allowance for loan losses as a percentage of gross loans held for investment	4.36%	4.23%	4.36%	4.23%
Consumer loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 5	$ 6	$ 6	$ 6
(Recovery) provision for loan losses	(1)	1	(2)	1
Recoveries	0	0		1
Charge-offs	0	(1)		(2)
Allowance for loan losses, end of the year	4	6	4	6
Collectively evaluated for impairment	4	6	4	6
Collectively evaluated for impairment	73	96	73	96
Total Loans Held for Investment, Gross	$ 73	$ 96	$ 73	$ 96	$ 95
Allowance for loan losses as a percentage of gross loans held for investment	5.48%	6.25%	5.48%	6.25%

Represents amount of allowance for loan losses as a percentage of gross loans-held for investment.

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Loans Held For Investment, Gross

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Net charge-offs (recoveries) as a percentage of average loans receivable, net, during the period (annualized).

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount, after recoveries, of loans and leases that have been written-off.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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