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, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 5,830	$ 6,608	$ 5,564	$ 7,587
Provision (recovery) for loan losses	169	(645)	430	(2,051)
Recoveries	2	6	7	433
Charge-offs	0	0	0	0
Net recoveries (charge-offs)	2	6	7	433
Allowance for loan losses, end of the year	6,001	5,969	6,001	5,969
Individually evaluated for allowances	38	51	38	51
Collectively evaluated for allowances	5,963	5,918	5,963	5,918
Individually evaluated for allowances	804	1,549	804	1,549
Collectively evaluated for allowances	1,073,356	890,902	1,073,356	890,902
Total Loans Held for Investment, Gross	$ 1,074,160	$ 892,451	$ 1,074,160	$ 892,451
Allowance for loan losses as a percentage of gross loans held for investment	0.56%	0.66%	0.56%	0.66%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period	0.00%	0.00%	0.00%	(0.07%)
Allowance for loan losses as a percentage of gross non-performing loans	584.32%	268.15%	584.32%	268.15%
Mortgage loans, Single-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 1,600	$ 1,396	$ 1,383	$ 2,000
Provision (recovery) for loan losses	127	(64)	339	(1,095)
Recoveries	2	6	7	433
Charge-offs	0	0	0
Allowance for loan losses, end of the year	1,729	1,338	1,729	1,338
Individually evaluated for allowances	38	51	38	51
Collectively evaluated for allowances	1,691	1,287	1,691	1,287
Individually evaluated for allowances	804	1,549	804	1,549
Collectively evaluated for allowances	511,828	326,112	511,828	326,112
Total Loans Held for Investment, Gross	$ 512,632	$ 327,661	$ 512,632	$ 327,661
Allowance for loan losses as a percentage of gross loans held for investment	0.34%	0.41%	0.34%	0.41%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period		(0.01%)		(0.20%)
Mortgage Loans, Multi Family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 3,300	$ 4,219	$ 3,282	$ 4,485
Provision (recovery) for loan losses	7	(544)	25	(810)
Recoveries	0	0	0
Charge-offs	0	0	0
Allowance for loan losses, end of the year	3,307	3,675	3,307	3,675
Collectively evaluated for allowances	3,307	3,675	3,307	3,675
Collectively evaluated for allowances	466,332	468,656	466,332	468,656
Total Loans Held for Investment, Gross	$ 466,332	$ 468,656	$ 466,332	$ 468,656
Allowance for loan losses as a percentage of gross loans held for investment	0.71%	0.78%	0.71%	0.78%
Mortgage loans, Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 847	$ 915	$ 816	$ 1,006
Provision (recovery) for loan losses	21	(45)	52	(136)
Recoveries	0	0	0
Charge-offs	0	0	0
Allowance for loan losses, end of the year	868	870	868	870
Collectively evaluated for allowances	868	870	868	870
Collectively evaluated for allowances	90,496	91,344	90,496	91,344
Total Loans Held for Investment, Gross	$ 90,496	$ 91,344	$ 90,496	$ 91,344
Allowance for loan losses as a percentage of gross loans held for investment	0.96%	0.95%	0.96%	0.95%
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 17	$ 55	$ 23	$ 51
Provision (recovery) for loan losses	4	4	(2)	8
Recoveries	0	0	0
Charge-offs	0	0	0
Allowance for loan losses, end of the year	21	59	21	59
Collectively evaluated for allowances	21	59	21	59
Collectively evaluated for allowances	2,891	4,127	2,891	4,127
Total Loans Held for Investment, Gross	$ 2,891	$ 4,127	$ 2,891	$ 4,127
Allowance for loan losses as a percentage of gross loans held for investment	0.73%	1.43%	0.73%	1.43%
Mortgage Loans Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 3	$ 3	$ 3	$ 3
Provision (recovery) for loan losses	(1)		(1)
Recoveries	0	0	0
Charge-offs	0	0	0
Allowance for loan losses, end of the year	2	3	2	3
Collectively evaluated for allowances	2	3	2	3
Collectively evaluated for allowances	108	131	108	131
Total Loans Held for Investment, Gross	$ 108	$ 131	$ 108	$ 131
Allowance for loan losses as a percentage of gross loans held for investment	1.85%	2.29%	1.85%	2.29%
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 58	$ 15	$ 52	$ 36
Provision (recovery) for loan losses	12	5	18	(16)
Recoveries	0	0	0
Charge-offs	0	0	0
Allowance for loan losses, end of the year	70	20	70	20
Collectively evaluated for allowances	70	20	70	20
Collectively evaluated for allowances	1,640	459	1,640	459
Total Loans Held for Investment, Gross	$ 1,640	$ 459	$ 1,640	$ 459
Allowance for loan losses as a percentage of gross loans held for investment	4.27%	4.36%	4.27%	4.36%
Consumer loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 5	$ 5	$ 5	$ 6
Provision (recovery) for loan losses	(1)	(1)	(1)	(2)
Recoveries	0	0	0
Charge-offs	0	0	0
Allowance for loan losses, end of the year	4	4	4	4
Collectively evaluated for allowances	4	4	4	4
Collectively evaluated for allowances	61	73	61	73
Total Loans Held for Investment, Gross	$ 61	$ 73	$ 61	$ 73
Allowance for loan losses as a percentage of gross loans held for investment	6.56%	5.48%	6.56%	5.48%

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

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Represents amount of allowance for loan losses as a percentage of gross non-performing loans

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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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The balance of financing receivables that were collectively 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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