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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, 2015
Jun. 30, 2015
Jun. 30, 2014
Amount      
Derivative [Line Items]      
Derivative financial instruments $ (149,507) $ (213,540)  
Fair Value      
Derivative [Line Items]      
Derivative financial instruments $ 869 2,432  
Commitments to extend credit on loans to be held for sale      
Derivative [Line Items]      
Commitments estimated may not fund (percent) 30.10%   26.90%
Commitments to extend credit on loans to be held for sale | Amount      
Derivative [Line Items]      
Derivative financial instruments $ 138,849 139,565  
Commitments to extend credit on loans to be held for sale | Fair Value      
Derivative [Line Items]      
Derivative financial instruments 2,504 1,499  
Best efforts loan sale commitments | Amount      
Derivative [Line Items]      
Derivative financial instruments (42,947) (36,908)  
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 (243,409) (320,197)  
Mandatory loan sale commitments and TBA MBS trades | Fair Value      
Derivative [Line Items]      
Derivative financial instruments (1,692) 741  
Call Option [Member] | Amount      
Derivative [Line Items]      
Derivative financial instruments (2,000) 4,000  
Call Option [Member] | Fair Value      
Derivative [Line Items]      
Derivative financial instruments $ 57 $ 192