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Borrowings - Additional Information (Details) - USD ($)
Mar. 31, 2020
Jun. 30, 2019
U.S. Bank    
Debt Instrument [Line Items]    
Maximum line of credit borrowing in master contract agreement $ 5,000,000 $ 5,000,000
Line of credit outstanding 0 0
Federal Home Loan Bank ("FHLB")    
Debt Instrument [Line Items]    
Maximum line of credit borrowing in master contract agreement 130,006,641  
Total outstanding in fixed rate term advances 24,500,000 44,200,000
Line of credit outstanding $ 0 $ 0