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Borrowings (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2021
USD ($)
Institution
Jun. 30, 2020
USD ($)
Borrowings [Abstract]    
Long-term fixed rate, fixed term advances $ 0 $ 7,600
Available-for-sale securities pledged as collateral 3,900 4,700
Federal Home Loan Bank of New York [Member]    
Borrowings [Abstract]    
Loans pledged as collateral 405,300 325,100
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member]    
Borrowings [Abstract]    
Loans pledged as collateral 405,300 321,500
Maximum amount of funding available 296,300 230,500
Total borrowings from Federal Home Loan Bank 0 7,600
Short-term or overnight borrowings from Federal Home Loan Bank 0 0
Long-term fixed rate, fixed term advances 0 $ 7,600
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member] | Weighted Average [Member]    
Borrowings [Abstract]    
Interest rate   1.73%
Weighted average maturity   15 months
Federal Reserve Bank [Member]    
Line of credit facility [Abstract]    
Amount outstanding 0  
Federal Reserve Bank [Member] | Paycheck Protection Plan Liquidity Facility [Member]    
Line of credit facility [Abstract]    
Amount outstanding 0 $ 10,900
Interest rate   0.35%
Federal Reserve Bank [Member] | The Bank of Greene County [Member]    
Borrowings [Abstract]    
Available-for-sale securities pledged as collateral   $ 5,500
Atlantic Central Bankers' Bank [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 7,500  
Amount outstanding 3,000 7,000
Atlantic Central Bankers' Bank [Member] | The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 10,000  
Other Financial Institution [Member] | The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity $ 64,500  
Number of other financial institutions | Institution 3  
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 $ 70,700