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Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Schedule of Outstanding Derivative Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Amount      
Derivative [Line Items]      
Derivative financial instruments $ (116,788) $ (107,276)  
Fair Value      
Derivative [Line Items]      
Derivative financial instruments $ 1,064 1,432  
Commitments to extend credit on loans to be held for sale      
Derivative [Line Items]      
Commitments estimated may not fund (percent) 27.80%   25.70%
Commitments to extend credit on loans to be held for sale | Amount      
Derivative [Line Items]      
Derivative financial instruments $ 92,065 92,726  
Commitments to extend credit on loans to be held for sale | Fair Value      
Derivative [Line Items]      
Derivative financial instruments 687 809  
Best efforts loan sale commitments | Amount      
Derivative [Line Items]      
Derivative financial instruments (22,965) (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 (185,888) (179,777)  
Mandatory loan sale commitments and TBA MBS trades | Fair Value      
Derivative [Line Items]      
Derivative financial instruments 377 586  
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