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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, 2016
Jun. 30, 2016
Jun. 30, 2015
Amount      
Derivative [Line Items]      
Derivative financial instruments $ (145,260) $ (155,523)  
Fair Value      
Derivative [Line Items]      
Derivative financial instruments $ 1,145 589  
Commitments to extend credit on loans to be held for sale      
Derivative [Line Items]      
Commitments estimated may not fund (percent) 26.80%   37.50%
Commitments to extend credit on loans to be held for sale | Amount      
Derivative [Line Items]      
Derivative financial instruments $ 94,354 181,780  
Commitments to extend credit on loans to be held for sale | Fair Value      
Derivative [Line Items]      
Derivative financial instruments 1,476 3,785  
Best efforts loan sale commitments | Amount      
Derivative [Line Items]      
Derivative financial instruments (30,858) (29,576)  
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 (208,756) (302,727)  
Mandatory loan sale commitments and TBA MBS trades | Fair Value      
Derivative [Line Items]      
Derivative financial instruments (331) (3,196)  
Call Option [Member] | Amount      
Derivative [Line Items]      
Derivative financial instruments 0 (5,000)  
Call Option [Member] | Fair Value      
Derivative [Line Items]      
Derivative financial instruments $ 0 $ 0