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
Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 7,587	$ 8,265
(Recovery) provision for loan losses	(339)	220
Recoveries	165	5
Charge-offs	0	0
Net recoveries (charge-offs)	165	5
Allowance for loan losses, end of period	7,413	8,490
Individually evaluated for impairment	260	84
Collectively evaluated for impairment	7,153	8,406
Individually evaluated for impairment	5,894	2,988
Collectively evaluated for impairment	854,065	883,861
Total Loans Held for Investment, Gross	$ 859,959	$ 886,849	$ 852,082
Allowance for loan losses as a percentage of gross loans held for investment	0.86%	0.95%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period (annualized)	(0.08%)	0.00%
Mortgage loans, Single-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 2,000	$ 2,622
(Recovery) provision for loan losses	(338)	44
Recoveries	165	5
Charge-offs	0	0
Allowance for loan losses, end of period	1,827	2,671
Individually evaluated for impairment	260	80
Collectively evaluated for impairment	1,567	2,591
Individually evaluated for impairment	5,894	2,957
Collectively evaluated for impairment	269,076	285,833
Total Loans Held for Investment, Gross	$ 274,970	$ 288,790	268,272
Allowance for loan losses as a percentage of gross loans held for investment	0.66%	0.92%
Mortgage Loans, Multi Family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 4,485	$ 4,329
(Recovery) provision for loan losses	40	161
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of period	4,525	4,490
Collectively evaluated for impairment	4,525	4,490
Collectively evaluated for impairment	489,550	482,900
Total Loans Held for Investment, Gross	$ 489,550	$ 482,900	484,408
Allowance for loan losses as a percentage of gross loans held for investment	0.92%	0.93%
Mortgage loans, Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 1,006	$ 1,110
(Recovery) provision for loan losses	(39)	52
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of period	967	1,162
Collectively evaluated for impairment	967	1,162
Collectively evaluated for impairment	91,779	105,207
Total Loans Held for Investment, Gross	$ 91,779	$ 105,207	95,279
Allowance for loan losses as a percentage of gross loans held for investment	1.05%	1.10%
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 51	$ 171
(Recovery) provision for loan losses	(2)	(55)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of period	49	116
Collectively evaluated for impairment	49	116
Collectively evaluated for impairment	2,574	8,787
Total Loans Held for Investment, Gross	$ 2,574	$ 8,787	3,040
Allowance for loan losses as a percentage of gross loans held for investment	1.90%	1.32%
Mortgage Loans Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 3	$ 3
(Recovery) provision for loan losses	0
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of period	3	3
Collectively evaluated for impairment	3	3
Collectively evaluated for impairment	137	142
Total Loans Held for Investment, Gross	$ 137	$ 142	139
Allowance for loan losses as a percentage of gross loans held for investment	2.19%	2.11%
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 36	$ 24
(Recovery) provision for loan losses	1	18
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of period	37	42
Individually evaluated for impairment		4
Collectively evaluated for impairment	37	38
Individually evaluated for impairment		31
Collectively evaluated for impairment	865	892
Total Loans Held for Investment, Gross	$ 865	$ 923	849
Allowance for loan losses as a percentage of gross loans held for investment	4.28%	4.55%
Consumer loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 6	$ 6
(Recovery) provision for loan losses	(1)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, end of period	5	6
Collectively evaluated for impairment	5	6
Collectively evaluated for impairment	84	100
Total Loans Held for Investment, Gross	$ 84	$ 100	$ 95
Allowance for loan losses as a percentage of gross loans held for investment	5.95%	6.00%

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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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually 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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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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