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Investment Securities - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]          
Principal payments from investment securities available for sale $ 7,900,000 $ 8,600,000 $ 25,300,000 $ 25,200,000  
Investments with an unrealized loss position 99,000   99,000   $ 20,000
Unrealized holding losses, 12 months or more 11,000   11,000   12,000
Impairment loss     0   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   $ 26,200,000   $ 39,700,000  
Investments with an unrealized loss position 88,000   88,000   14,000
Unrealized holding losses, 12 months or more         6,000
U.S. SBA securities          
Debt Securities, Available-for-sale [Line Items]          
Investments with an unrealized loss position 11,000   11,000   6,000
Unrealized holding losses, 12 months or more $ 11,000   $ 11,000   $ 6,000