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Investment Securities - Additional Information (Details) - USD ($)
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]      
Investments with an unrealized loss position $ 165,000   $ 62,000
Unrealized holding losses, 12 months or more 18,000   17,000
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 9,400,000 $ 9,300,000  
Payments to acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity 84,900,000    
Investments with an unrealized loss position 147,000   45,000
Unrealized holding losses, 12 months or more 0   0
U.S. SBA securities      
Debt Securities, Available-for-sale [Line Items]      
Investments with an unrealized loss position 18,000   17,000
Unrealized holding losses, 12 months or more $ 18,000   $ 17,000