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Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Schedule of Outstanding Derivative Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Amount      
Derivative [Line Items]      
Derivative financial instruments $ (275,247) $ (213,540)  
Fair Value      
Derivative [Line Items]      
Derivative financial instruments $ 839 2,432  
Commitments to extend credit on loans to be held for sale      
Derivative [Line Items]      
Commitments estimated may not fund (percent) 29.10%   26.90%
Commitments to extend credit on loans to be held for sale | Amount      
Derivative [Line Items]      
Derivative financial instruments $ 98,763 139,565  
Commitments to extend credit on loans to be held for sale | Fair Value      
Derivative [Line Items]      
Derivative financial instruments 1,170 1,499  
Best efforts loan sale commitments | Amount      
Derivative [Line Items]      
Derivative financial instruments (141,523) (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 (233,487) (320,197)  
Mandatory loan sale commitments and TBA MBS trades | Fair Value      
Derivative [Line Items]      
Derivative financial instruments (355) 741  
Call Option [Member] | Amount      
Derivative [Line Items]      
Derivative financial instruments 1,000 4,000  
Call Option [Member] | Fair Value      
Derivative [Line Items]      
Derivative financial instruments $ 24 $ 192