Loans Held for Investment - Schedule of Total Recorded Investment in Non-Performing Loans by Type (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Related Allowance	$ (645)	$ (772)
Unpaid Principal Balance	7,568	9,854
Related Charge-Offs	(307)	(436)
Recorded Investment	7,261	9,418
Recorded Investment, Net of Allowance	6,616	8,646
Mortgage loans, Single-family
Financing Receivable, Allowance for Credit Losses [Line Items]
With a related allowance Unpaid Principal Balance	5,437	7,400
With Related Allowance, Related Charge-Offs	0	0
With Related Allowance, Recorded Investment	5,437	7,400
Related Allowance	(309)	(434)
Recorded Investment, with Related Allowance, Net	5,128	6,966
Without a related allowance, Unpaid Principal Balance	1,020	1,335
With No Related Allowance, Related Charge-Offs	(307)	(436)
With No Related Allowance, Recorded Investment	713	899
Recorded Investment, with No Related Allowance, Net	713	899
Unpaid Principal Balance	6,457	8,735
Related Charge-Offs	(307)	(436)
Recorded Investment	6,150	8,299
Recorded Investment, Net of Allowance	5,841	7,865
Mortgage Loans, Multi Family
Financing Receivable, Allowance for Credit Losses [Line Items]
With a related allowance Unpaid Principal Balance	1,111	1,119
With Related Allowance, Related Charge-Offs	0	0
With Related Allowance, Recorded Investment	1,111	1,119
Related Allowance	(336)	(338)
Recorded Investment, with Related Allowance, Net	775	781
Unpaid Principal Balance	1,111	1,119
Related Charge-Offs	0	0
Recorded Investment	1,111	1,119
Recorded Investment, Net of Allowance	$ 775	$ 781