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Investment Securities (Detail Textuals) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Debt Securities, Available-for-sale [Line Items]    
Principal payments from investment securities available for sale $ 8.3 $ 6.0
U.S. government sponsored enterprise MBS    
Debt Securities, Available-for-sale [Line Items]    
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity $ 10.1