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, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 8,538	$ 6,921	$ 8,265	$ 7,076
(Recovery) provision for loan losses	(200)	874	59	671
Recoveries	9	15	24	65
Charge-offs	(1)	0	(2)	(2)
Net recoveries (charge-offs)	8	15	22	63
Allowance for loan losses, end of period	8,346	7,810	8,346	7,810
Total individually evaluated allowance	572	51	572	51
Collectively evaluated for impairment	7,774	7,759	7,774	7,759
Individually evaluated for impairment	9,343	2,738	9,343	2,738
Collectively evaluated for impairment	832,650	912,550	832,650	912,550
Total Loans Held for Investment, Gross	$ 841,993	$ 915,288	$ 841,993	$ 915,288	$ 904,466
Allowance for loan losses as a percentage of gross loans held for investment	0.98%	0.85%	0.98%	0.85%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period (annualized)	0.00%	(0.01%)	0.00%	(0.01%)
Mortgage loans, Single-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 2,706	$ 2,157	$ 2,622	$ 2,709
(Recovery) provision for loan losses	(311)	431	(241)	(169)
Recoveries	9	14	23	63
Charge-offs	0	0	0	(1)
Allowance for loan losses, end of period	2,404	2,602	2,404	2,602
Total individually evaluated allowance	572	45	572	45
Collectively evaluated for impairment	1,832	2,557	1,832	2,557
Individually evaluated for impairment	9,343	2,698	9,343	2,698
Collectively evaluated for impairment	245,050	323,988	245,050	323,988
Total Loans Held for Investment, Gross	$ 254,393	$ 326,686	$ 254,393	$ 326,686	298,810
Allowance for loan losses as a percentage of gross loans held for investment	0.94%	0.80%	0.94%	0.80%
Mortgage Loans, Multi Family
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 4,540	$ 3,502	$ 4,329	$ 3,219
(Recovery) provision for loan losses	202	456	413	739
Recoveries	0
Charge-offs	0
Allowance for loan losses, end of period	4,742	3,958	4,742	3,958
Collectively evaluated for impairment	4,742	3,958	4,742	3,958
Collectively evaluated for impairment	483,283	475,941	483,283	475,941
Total Loans Held for Investment, Gross	$ 483,283	$ 475,941	$ 483,283	$ 475,941	491,903
Allowance for loan losses as a percentage of gross loans held for investment	0.98%	0.83%	0.98%	0.83%
Mortgage loans, Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 1,132	$ 1,058	$ 1,110	$ 1,050
(Recovery) provision for loan losses	(30)	3	(8)	11
Recoveries	0
Charge-offs	0
Allowance for loan losses, end of period	1,102	1,061	1,102	1,061
Collectively evaluated for impairment	1,102	1,061	1,102	1,061
Collectively evaluated for impairment	99,722	105,691	99,722	105,691
Total Loans Held for Investment, Gross	$ 99,722	$ 105,691	$ 99,722	$ 105,691	105,235
Allowance for loan losses as a percentage of gross loans held for investment	1.11%	1.00%	1.11%	1.00%
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 110	$ 168	$ 171	$ 61
(Recovery) provision for loan losses	(57)	(12)	(118)	95
Recoveries	0
Charge-offs	0
Allowance for loan losses, end of period	53	156	53	156
Collectively evaluated for impairment	53	156	53	156
Collectively evaluated for impairment	3,508	6,346	3,508	6,346
Total Loans Held for Investment, Gross	$ 3,508	$ 6,346	$ 3,508	$ 6,346	7,801
Allowance for loan losses as a percentage of gross loans held for investment	1.51%	2.46%	1.51%	2.46%
Mortgage Loans Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 3	$ 28	$ 3	$ 3
(Recovery) provision for loan losses	0	(2)		(3)
Recoveries	0
Charge-offs	0
Allowance for loan losses, end of period	3	26	3	26
Total individually evaluated allowance		6		6
Collectively evaluated for impairment	3	20	3	20
Individually evaluated for impairment		40		40
Collectively evaluated for impairment	140	462	140	462
Total Loans Held for Investment, Gross	$ 140	$ 502	$ 140	502	143
Allowance for loan losses as a percentage of gross loans held for investment	2.14%	5.18%	2.14%
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 41		$ 24	26
(Recovery) provision for loan losses	(5)		12
Recoveries	0
Charge-offs	0
Allowance for loan losses, end of period	36	$ 26	36	26
Total individually evaluated allowance		6		6
Collectively evaluated for impairment	36	20	36	20
Individually evaluated for impairment		40		40
Collectively evaluated for impairment	851	462	851	462
Total Loans Held for Investment, Gross	$ 851	502	$ 851	$ 502	480
Allowance for loan losses as a percentage of gross loans held for investment	4.23%		4.23%	5.18%
Consumer loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance at beginning of period	$ 6	8	$ 6	$ 8
(Recovery) provision for loan losses	1	(2)	1	(2)
Recoveries	0	1	1	2
Charge-offs	(1)	0	(2)	(1)
Allowance for loan losses, end of period	6	7	6	7
Collectively evaluated for impairment	6	7	6	7
Collectively evaluated for impairment	96	122	96	122
Total Loans Held for Investment, Gross	$ 96	$ 122	$ 96	$ 122	$ 94
Allowance for loan losses as a percentage of gross loans held for investment	6.25%	5.74%	6.25%	5.74%

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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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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