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Investment Securities - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]      
Principal payments from investment securities available for sale $ 9,300 $ 8,300  
Investments with an unrealized loss position 54   $ 20
Unrealized holding losses, 12 months or more 15   12
U.S. government sponsored enterprise MBS      
Debt Securities, Available-for-sale [Line Items]      
Investments with an unrealized loss position 41   14
Unrealized holding losses, 12 months or more 2   6
U.S. SBA securities      
Debt Securities, Available-for-sale [Line Items]      
Investments with an unrealized loss position 13   6
Unrealized holding losses, 12 months or more $ 13   $ 6