Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Schedule of Outstanding Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Amount
Derivative [Line Items]
Derivative financial instruments	$ (86,433)	$ (107,276)
Fair Value
Derivative [Line Items]
Derivative financial instruments	$ 511	$ 1,432
Commitments to extend credit on loans to be held for sale
Derivative [Line Items]
Commitments estimated may not fund (percent)	30.60%	25.70%
Commitments to extend credit on loans to be held for sale | Amount
Derivative [Line Items]
Derivative financial instruments	$ 48,032	$ 92,726
Commitments to extend credit on loans to be held for sale | Fair Value
Derivative [Line Items]
Derivative financial instruments	716	809
Best efforts loan sale commitments | Amount
Derivative [Line Items]
Derivative financial instruments	(12,890)	(17,225)
Best efforts loan sale commitments | Fair Value
Derivative [Line Items]
Derivative financial instruments	0	0
Mandatory loan sale commitments and TBA MBS trades | Amount
Derivative [Line Items]
Derivative financial instruments	(121,575)	(179,777)
Mandatory loan sale commitments and TBA MBS trades | Fair Value
Derivative [Line Items]
Derivative financial instruments	(205)	586
Call Option [Member] | Amount
Derivative [Line Items]
Derivative financial instruments	0	(3,000)
Call Option [Member] | Fair Value
Derivative [Line Items]
Derivative financial instruments	$ 0	$ 37