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Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Schedule of Outstanding Derivative Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Amount    
Derivative [Line Items]    
Derivative financial instruments $ (107,276) $ (155,523)
Fair Value    
Derivative [Line Items]    
Derivative financial instruments $ 1,432 $ 589
Commitments to extend credit on loans to be held for sale    
Derivative [Line Items]    
Commitments estimated may not fund (percent) 25.70% 37.50%
Commitments to extend credit on loans to be held for sale | Amount    
Derivative [Line Items]    
Derivative financial instruments [1] $ 92,726 $ 181,780
Commitments to extend credit on loans to be held for sale | Fair Value    
Derivative [Line Items]    
Derivative financial instruments [1] 809 3,785
Best efforts loan sale commitments | Amount    
Derivative [Line Items]    
Derivative financial instruments (17,225) (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 (179,777) (302,727)
Mandatory loan sale commitments and TBA MBS trades | Fair Value    
Derivative [Line Items]    
Derivative financial instruments 586 (3,196)
Put option contracts | Amount    
Derivative [Line Items]    
Derivative financial instruments (3,000) (5,000)
Put option contracts | Fair Value    
Derivative [Line Items]    
Derivative financial instruments $ 37 $ 0
[1] Net of 25.7% at June 30, 2017 and 37.5% at June 30, 2016 of commitments, which management has estimated may not fund.