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Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Borrowings [Abstract]    
Short-term or overnight borrowings from Federal Home Loan Bank $ 0 $ 6,900
Available-for-sale securities pledged as collateral 1,700 2,800
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member]    
Borrowings [Abstract]    
Loans pledged as collateral 283,600  
Maximum amount of funding available 232,300  
Total borrowings from Federal Home Loan Bank 18,200  
Short-term or overnight borrowings from Federal Home Loan Bank $ 0 $ 6,900
Interest rate   1.28%
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member] | Weighted Average [Member]    
Borrowings [Abstract]    
Interest rate 1.63%  
Weighted average maturity 22 months  
Federal Reserve Bank [Member] | The Bank of Greene County [Member]    
Borrowings [Abstract]    
Available-for-sale securities pledged as collateral $ 1,700  
Atlantic Central Bankers' Bank [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 7,500  
Amount outstanding 0 $ 0
Atlantic Central Bankers' Bank [Member] | The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 6,000  
Amount outstanding 0 0
Other Financial Institution [Member] | The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 10,000  
Amount outstanding 0 0
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 $ 40,000 $ 0