Loans Held For Investment: Schedule of Allowance for Loan Losses Additional Detail (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Allowance at beginning of period	$ 8,063	$ 8,725	$ 8,039	$ 8,670
(Recovery) provision for loan losses	(11)	(350)	(158)	500
Recoveries	48	39	132	310
Charge-offs	(25)	(23)	(254)	(89)
Net charge-offs	23	16	(122)	221
Balance at end of period	$ 8,075	$ 8,391	$ 8,075	$ 8,391
Allowance for loan losses as a percentage of gross loans held for investment at the end of the period	0.90%	0.96%	0.90%	0.96%
Net (recoveries) charge-offs as a percentage of average loans receivable, net, during the period (annualized)	(0.01%)	(0.01%)	0.02%	(0.04%)
Mortgage loans, Single-family
Allowance for Loan and Lease Losses [Roll Forward]
Recoveries	$ 48	$ 33	$ 132	$ 296
Charge-offs	(25)	(21)	(254)	(87)
Mortgage loans, Multi-family
Allowance for Loan and Lease Losses [Roll Forward]
Recoveries	0	6	0	13
Consumer Loans
Allowance for Loan and Lease Losses [Roll Forward]
Recoveries	0	0	0	1
Charge-offs	$ 0	$ (2)	$ 0	$ (2)