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Investment Securities - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]          
Principal payments from investment securities available for sale $ 8,100 $ 8,300 $ 17,400 $ 16,700  
Investments with an unrealized loss position 77   77   $ 20
Unrealized holding losses, 12 months or more 13   13   12
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 13,500   13,500    
Investments with an unrealized loss position 64   64   14
Unrealized holding losses, 12 months or more         6
U.S. SBA securities          
Debt Securities, Available-for-sale [Line Items]          
Investments with an unrealized loss position 13   13   6
Unrealized holding losses, 12 months or more $ 13   $ 13   $ 6