Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Schedule of Outstanding Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Amount
Derivative [Line Items]
Derivative financial instruments	$ 0	$ (90,355)
Fair Value
Derivative [Line Items]
Derivative financial instruments	0	385
Commitments to extend credit on loans to be held for sale | Amount
Derivative [Line Items]
Derivative financial instruments	0	56,906
Commitments to extend credit on loans to be held for sale | Fair Value
Derivative [Line Items]
Derivative financial instruments	0	825
Best efforts loan sale commitments | Amount
Derivative [Line Items]
Derivative financial instruments	0	(29,502)
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	0	(117,759)
Mandatory loan sale commitments and TBA MBS trades | Fair Value
Derivative [Line Items]
Derivative financial instruments	0	(440)
Put option contracts | Amount
Derivative [Line Items]
Derivative financial instruments	0	0
Put option contracts | Fair Value
Derivative [Line Items]
Derivative financial instruments	$ 0	$ 0