Loans Held for Investment - Schedule of Restructured Loans by Type, Net of Individually Evaluated Allowances (Details) $ in Thousands	6 Months Ended	9 Months Ended	12 Months Ended
Dec. 31, 2019 loan	Mar. 31, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan
Financing Receivable, Impaired [Line Items]
Number of modified loans \| loan		6	8
Restructured loans, Allowance for Loan Losses		$ (280)	$ (442)
Restructured Loans, Allowance for Loan Losses		(51)	(130)
Restructured Loans, Unpaid Principal Balance		2,176	4,288
Restructured Loans, Related Charge-offs		365	365
Restructured loans, Recorded Investment		3,915	6,660
Restructured Loans, Recorded Investment		1,811	3,923
Restructured loans, net investment		3,635
Restructured loans, net investment		1,760	3,793
Restructured loans on non-accrual status		1,760	1,932
Mortgage loans, Single-family
Financing Receivable, Impaired [Line Items]
Restructured Loans, With Related Allowance, Unpaid Principal Balance		677	2,199
Restructured Loans, With Related Allowance, Related Charge-offs			0
Restructured loans, With a related allowance, Recorded Investment		1,802	2,640
Restructured Loans, With a Related Allowance, Recorded Investment		677	2,199
Restructured loans, Allowance for Loan Losses		(274)	(434)
Restructured Loans, Allowance for Loan Losses		(45)	(122)
Restructured loans, With a related allowance, Net Investment		1,528	2,206
Restructured loans, with a related allowance, net investment		632	2,077
Restructured Loans, Without a Related Allowance, Unpaid Principal Balance		1,459	2,040
Restructured Loans, Without a Related Allowance, Related Charge-offs		365	365
Restructured loans, Without a related allowance, Recorded Investment		2,073	3,000
Restructured Loans, Without a Related Allowance, Recorded Investment		1,094	1,675
Restructured Loans, Without a Related Allowance, Net Investment		1,094	1,675
Restructured Loans, Unpaid Principal Balance		2,136	4,239
Restructured Loans, Related Charge-offs		365	365
Restructured loans, Recorded Investment		3,875	5,640
Restructured Loans, Recorded Investment		1,771	3,874
Restructured loans, net investment		3,601	5,206
Restructured loans, net investment		1,726	3,752
Restructured loans on non-accrual status		1,726	1,891
Commercial business loans
Financing Receivable, Impaired [Line Items]
Restructured Loans, With Related Allowance, Unpaid Principal Balance		40	49
Restructured Loans, With Related Allowance, Related Charge-offs			0
Restructured loans, With a related allowance, Recorded Investment		40	49
Restructured Loans, With a Related Allowance, Recorded Investment		40	49
Restructured loans, Allowance for Loan Losses		(6)	(8)
Restructured Loans, Allowance for Loan Losses		(6)	(8)
Restructured loans, With a related allowance, Net Investment		34
Restructured Loans, Unpaid Principal Balance		40	49
Restructured Loans, Related Charge-offs			0
Restructured loans, Recorded Investment		40	49
Restructured Loans, Recorded Investment		40	49
Restructured loans, net investment		34	41
Restructured loans, net investment		34	41
Restructured loans on non-accrual status		$ 34	41
Construction
Financing Receivable, Impaired [Line Items]
Restructured loans, Recorded Investment			971
Restructured loans, net investment			$ 971
Substandard
Financing Receivable, Impaired [Line Items]
Number of modified loans \| loan	2		6

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