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Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Schedule of Impact of Derivative Financial Instruments on Gain on Sale of Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]      
Total derivative financial instruments $ (1,047) $ 1,066 $ (1,763)
Commitments to extend credit on loans to be held for sale      
Derivative [Line Items]      
Total derivative financial instruments 16 (2,976) 2,286
Mandatory loan sale commitments and TBA MBS trades      
Derivative [Line Items]      
Total derivative financial instruments (1,026) 3,782 (3,937)
Option contracts      
Derivative [Line Items]      
Total derivative financial instruments $ (37) $ 260 $ (112)