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Investment Securities - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]          
Investments with an unrealized loss position $ 1,989,000   $ 1,989,000   $ 62,000
Unrealized holding losses, 12 months or more 17,000   17,000   17,000
Unrealized Holding Losses Total, Unrealized Losses 1,989,000   1,989,000   69,000
Impairment loss     0 $ 0  
U.S. government sponsored enterprise MBS          
Debt Securities, Available-for-sale [Line Items]          
Principal payments from investment securities available for sale 15,000,000 $ 7,900,000 36,800,000 $ 25,300,000  
Payments to acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity 51,600,000   158,000,000    
Investments with an unrealized loss position 1,972,000   1,972,000   45,000
Unrealized holding losses, 12 months or more 0   0   0
U.S. SBA securities          
Debt Securities, Available-for-sale [Line Items]          
Investments with an unrealized loss position 17,000   17,000   17,000
Unrealized holding losses, 12 months or more $ 17,000   $ 17,000   $ 17,000