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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
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Derivative [Line Items]      
Total derivative financial instruments $ (368) $ 564  
Commitments to extend credit on loans to be held for sale      
Derivative [Line Items]      
Total derivative financial instruments (122) (1,211)  
Mandatory loan sale commitments and TBA MBS trades      
Derivative [Line Items]      
Total derivative financial instruments (209) 1,797  
Option contracts      
Derivative [Line Items]      
Total derivative financial instruments (37) $ (22)  
Other Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities $ 49   $ 38