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Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Short-term or overnight borrowings from Federal Home Loan Bank $ 6,900 $ 26,100
Available-for-sale securities pledged as collateral 2,800 4,200
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Loans pledged as collateral 256,100  
Maximum amount of funding available 206,400  
Total borrowings from Federal Home Loan Bank 29,600  
Short-term or overnight borrowings from Federal Home Loan Bank $ 6,900  
Interest rate 1.28%  
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member] | Weighted Average [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Interest rate 1.60%  
Weighted average maturity 28 months  
Federal Reserve Bank [Member] | The Bank of Greene County [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Available-for-sale securities pledged as collateral $ 2,800  
Atlantic Central Bankers' Bank [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 5,000  
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 5,000  
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 $ 0 $ 0