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Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Short-term borrowings from Federal Home Loan Bank $ 26,100 $ 22,900
Available-for-sale securities pledged as collateral 4,200 4,800
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 210,700  
Maximum amount of funding available 177,000  
Total borrowings from Federal Home Loan Bank 46,400  
Short-term borrowings from Federal Home Loan Bank $ 26,100  
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 1.48%  
Weighted average maturity 30 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 $ 4,200  
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