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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)
$ in Thousands
3 Months Ended
Sep. 30, 2018
USD ($)
Derivative [Line Items]  
Total net gain (loss) $ 350
Commitments to extend credit on loans to be held for sale  
Derivative [Line Items]  
Total net gain (loss) (329)
Mandatory Loan Sale Commitments And Tba Mortgage Backed Securities Trades [Member]  
Derivative [Line Items]  
Total net gain (loss) $ 679