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	6 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 5,638	$ 7,413	$ 5,564	$ 7,587
Provision (recovery) for loan losses	191	(1,067)	261	(1,406)
Recoveries	1	262	5	427
Charge-offs	0	0	0	0
Net recoveries (charge-offs)	1	262	5	427
Allowance for loan losses, end of the year	5,830	6,608	5,830	6,608
Individually evaluated for allowances	38	52	38	52
Collectively evaluated for allowances	5,792	6,556	5,792	6,556
Individually evaluated for allowances	810	1,583	810	1,583
Collectively evaluated for allowances	1,036,403	850,440	1,036,403	850,440
Total Loans Held for Investment, Gross	$ 1,037,213	$ 852,023	$ 1,037,213	$ 852,023
Allowance for loan losses as a percentage of gross loans held for investment	0.56%	0.77%	0.56%	0.77%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period	0.00%	(0.12%)	0.00%	(0.10%)
Allowance for loan losses as a percentage of gross non-performing loans	561.12%	196.20%	561.12%	196.20%
Mortgage loans, Single-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 1,450	$ 1,827	$ 1,383	$ 2,000
Provision (recovery) for loan losses	149	(693)	212	(1,031)
Recoveries	1	262	5	427
Charge-offs	0	0
Allowance for loan losses, end of the year	1,600	1,396	1,600	1,396
Individually evaluated for allowances	38	52	38	52
Collectively evaluated for allowances	1,562	1,344	1,562	1,344
Individually evaluated for allowances	810	1,583	810	1,583
Collectively evaluated for allowances	478,920	288,662	478,920	288,662
Total Loans Held for Investment, Gross	$ 479,730	$ 290,245	$ 479,730	$ 290,245
Allowance for loan losses as a percentage of gross loans held for investment	0.33%	0.48%	0.33%	0.48%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period	0.00%	(0.37%)	0.00%	(0.31%)
Mortgage Loans, Multi Family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 3,305	$ 4,525	$ 3,282	$ 4,485
Provision (recovery) for loan losses	(5)	(306)	18	(266)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	3,300	4,219	3,300	4,219
Collectively evaluated for allowances	3,300	4,219	3,300	4,219
Collectively evaluated for allowances	465,350	466,467	465,350	466,467
Total Loans Held for Investment, Gross	$ 465,350	$ 466,467	$ 465,350	$ 466,467
Allowance for loan losses as a percentage of gross loans held for investment	0.71%	0.90%	0.71%	0.90%
Mortgage loans, Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 806	$ 967	$ 816	$ 1,006
Provision (recovery) for loan losses	41	(52)	31	(91)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	847	915	847	915
Collectively evaluated for allowances	847	915	847	915
Collectively evaluated for allowances	88,200	91,236	88,200	91,236
Total Loans Held for Investment, Gross	$ 88,200	$ 91,236	$ 88,200	$ 91,236
Allowance for loan losses as a percentage of gross loans held for investment	0.96%	1.00%	0.96%	1.00%
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 22	$ 49	$ 23	$ 51
Provision (recovery) for loan losses	(5)	6	(6)	4
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	17	55	17	55
Collectively evaluated for allowances	17	55	17	55
Collectively evaluated for allowances	2,388	3,501	2,388	3,501
Total Loans Held for Investment, Gross	$ 2,388	$ 3,501	$ 2,388	$ 3,501
Allowance for loan losses as a percentage of gross loans held for investment	0.71%	1.57%	0.71%	1.57%
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	0
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	3	3	3	3
Collectively evaluated for allowances	3	3	3	3
Collectively evaluated for allowances	112	134	112	134
Total Loans Held for Investment, Gross	$ 112	$ 134	$ 112	$ 134
Allowance for loan losses as a percentage of gross loans held for investment	2.68%	2.24%	2.68%	2.24%
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 48	$ 37	$ 52	$ 36
Provision (recovery) for loan losses	10	(22)	6	(21)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	58	15	58	15
Collectively evaluated for allowances	58	15	58	15
Collectively evaluated for allowances	1,358	362	1,358	362
Total Loans Held for Investment, Gross	$ 1,358	$ 362	$ 1,358	$ 362
Allowance for loan losses as a percentage of gross loans held for investment	4.27%	4.14%	4.27%	4.14%
Consumer loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of the year	$ 4	$ 5	$ 5	$ 6
Provision (recovery) for loan losses	1			(1)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of the year	5	5	5	5
Collectively evaluated for allowances	5	5	5	5
Collectively evaluated for allowances	75	78	75	78
Total Loans Held for Investment, Gross	$ 75	$ 78	$ 75	$ 78
Allowance for loan losses as a percentage of gross loans held for investment	6.67%	6.41%	6.67%	6.41%

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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