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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
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Derivative [Line Items]          
Total derivative financial instruments $ (15) $ (143) $ (936) $ 757  
Commitments to extend credit on loans to be held for sale          
Derivative [Line Items]          
Total derivative financial instruments 266 628 173 (1,681)  
Mandatory loan sale commitments and TBA MBS trades          
Derivative [Line Items]          
Total derivative financial instruments (281) (760) (1,072) 2,105  
Option contracts          
Derivative [Line Items]          
Total derivative financial instruments 0 $ (11) (37) $ 333  
Other Liabilities [Member]          
Derivative [Line Items]          
Derivative liabilities $ 489   $ 489   $ 38