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Investment Securities (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]          
Principal payments from investment securities available for sale $ 8,600 $ 7,400 $ 25,200 $ 19,100  
Investments with an unrealized loss position 182   182   $ 777
Unrealized holding losses, 12 months or more 163   163   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 26,200 $ 12,400 39,700 50,900  
Investments with an unrealized loss position 163   163   762
Unrealized holding losses, 12 months or more 163   163   0
U.S. SBA securities          
Debt Securities, Available-for-sale [Line Items]          
Payments to acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity       $ 3,000  
Investments with an unrealized loss position 19   19   15
Unrealized holding losses, 12 months or more $ 0   $ 0   $ 0