Loans Held for Investment - Schedule of Total Recorded Investment in Non-Performing Loans by Type (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Related Allowance	$ (442)	$ (442)
Unpaid Principal Balance	5,833	7,178
Related Charge-Offs	(467)	(518)
Recorded Investment	5,366	6,660
Recorded Investment, Net of Allowance	4,924	6,218
Impaired financing receivable, recorded investment, average	4,426	6,606
Impaired financing receivable, interest income recognized	203	408
Mortgage loans, Single-family
Financing Receivable, Allowance for Credit Losses [Line Items]
With a related allowance Unpaid Principal Balance	3,289	2,640
With Related Allowance, Related Charge-Offs	0	0
With Related Allowance, Recorded Investment	3,289	2,640
Related Allowance	(438)	(434)
Recorded Investment, with Related Allowance, Net	2,851	2,206
Without a related allowance, Unpaid Principal Balance	2,509	3,518
With No Related Allowance, Related Charge-Offs	(467)	(518)
With No Related Allowance, Recorded Investment	2,042	3,000
Recorded Investment, with No Related Allowance, Net	2,042	3,000
Unpaid Principal Balance	5,798	6,158
Related Charge-Offs	(467)	(518)
Recorded Investment	5,331	5,640
Recorded Investment, Net of Allowance	4,893	5,206
Impaired financing receivable, recorded investment, with related allowance, average	1,541	1,583
Impaired financing receivable, interest income recognized, with related allowance	60	110
Impaired Financing Receivable, Interest Income Recognized, with No Related Allowance	119	293
Impaired financing receivable, recorded investment, without a related allowance, average	2,572	4,301
Impaired financing receivable, recorded investment, average	4,113	5,884
Impaired financing receivable, interest income recognized	179	403
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Related Allowance	0
Recorded Investment, with Related Allowance, Net		0
Without a related allowance, Unpaid Principal Balance	0	971
With No Related Allowance, Related Charge-Offs	0	0
With No Related Allowance, Recorded Investment		971
Recorded Investment, with No Related Allowance, Net	0	971
Unpaid Principal Balance	0	971
Related Charge-Offs	0	0
Recorded Investment	0	971
Recorded Investment, Net of Allowance	0	971
Impaired Financing Receivable, Interest Income Recognized, with No Related Allowance	20
Impaired financing receivable, recorded investment, without a related allowance, average	271	664
Impaired financing receivable, recorded investment, average	271	664
Impaired financing receivable, interest income recognized	20
Commercial business loans
Financing Receivable, Allowance for Credit Losses [Line Items]
With a related allowance Unpaid Principal Balance	35	49
With Related Allowance, Related Charge-Offs	0	0
With Related Allowance, Recorded Investment	35	49
Related Allowance	(4)	(8)
Recorded Investment, with Related Allowance, Net	31	41
Unpaid Principal Balance	35	49
Related Charge-Offs	0	0
Recorded Investment	35	49
Recorded Investment, Net of Allowance	31	41
Impaired financing receivable, recorded investment, with related allowance, average	42	58
Impaired financing receivable, interest income recognized, with related allowance	4	5
Impaired financing receivable, recorded investment, average	42	58
Impaired financing receivable, interest income recognized	$ 4	$ 5

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