Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Schedule of Allowance for Loan Losses of Undisbursed Funds and Commitments on Loans Held for Investment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Allowance at beginning of period	$ 7,385	$ 8,039
Recovery from the allowance for loan losses	475	536
Allowance for loan losses, end of period	7,076	7,385
Commitments to Extend Credit and Undisbursed Funds
Allowance for Loan and Lease Losses [Roll Forward]
Allowance at beginning of period	157	277
Recovery from the allowance for loan losses	(16)	(120)
Allowance for loan losses, end of period	$ 141	$ 157