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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, 2018
Jun. 30, 2017
Amount    
Derivative [Line Items]    
Derivative financial instruments $ (90,355) $ (107,276)
Fair Value    
Derivative [Line Items]    
Derivative financial instruments $ 385 $ 1,432
Commitments to extend credit on loans to be held for sale    
Derivative [Line Items]    
Commitments estimated may not fund (percent) 24.70% 25.70%
Commitments to extend credit on loans to be held for sale | Amount    
Derivative [Line Items]    
Derivative financial instruments [1] $ 56,906 $ 92,726
Commitments to extend credit on loans to be held for sale | Fair Value    
Derivative [Line Items]    
Derivative financial instruments [1] 825 809
Best efforts loan sale commitments | Amount    
Derivative [Line Items]    
Derivative financial instruments (29,502) (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 (117,759) (179,777)
Mandatory loan sale commitments and TBA MBS trades | Fair Value    
Derivative [Line Items]    
Derivative financial instruments (440) 586
Put option contracts | Amount    
Derivative [Line Items]    
Derivative financial instruments 0 (3,000)
Put option contracts | Fair Value    
Derivative [Line Items]    
Derivative financial instruments $ 0 $ 37
[1] Net of 24.7% at June 30, 2018 and 25.7% at June 30, 2017 of commitments, which management has estimated may not fund.