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Borrowings (Details)
$ in Millions
12 Months Ended
Jun. 30, 2022
USD ($)
Institution
Jun. 30, 2021
USD ($)
Federal Home Loan Bank of New York [Member]    
Borrowings [Abstract]    
Loans pledged as collateral $ 445.6 $ 405.3
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member]    
Borrowings [Abstract]    
Loans pledged as collateral 445.6 405.3
Maximum amount of funding available 318.5 296.3
Total borrowings from Federal Home Loan Bank   0.0
Short-term or overnight borrowings from Federal Home Loan Bank 123.7 0.0
Stand-by letters of credit from Federal Home Loan Bank 0.0 0.0
Long-term fixed rate, fixed term advances 0.0 0.0
Federal Reserve Bank [Member]    
Line of credit facility [Abstract]    
Amount outstanding 0.0 0.0
Atlantic Central Bankers' Bank [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 7.5  
Amount outstanding 0.0 3.0
Atlantic Central Bankers' Bank [Member] | The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 15.0  
Other Financial Institution [Member] | The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity $ 50.0  
Number of other financial institutions | Institution 2  
Standby Letters of Credit [Member] | Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Amount outstanding $ 0.0 $ 0.0