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Borrowings, Federal Home Loan Bank Borrowings, Bank Term Funding Program, and Lines of Credit (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2024
USD ($)
Institution
Jun. 30, 2023
USD ($)
Borrowings [Abstract]    
Long-term fixed rate borrowings $ 34,156 $ 0
Line of credit facility [Abstract]    
Amount outstanding 0 0
Bank Term Funding Program [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 25,000  
Amount outstanding $ 25,000 0
Maturity period Jan. 31, 2025  
Interest rate 4.80%  
Collateral amount available to be pledged against potential borrowings $ 46,700  
The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity 15,000  
Federal Home Loan Bank of New York [Member]    
Borrowings [Abstract]    
Loans pledged as collateral 601,600 573,500
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member]    
Borrowings [Abstract]    
Loans pledged as collateral 601,600  
Maximum amount of funding available 372,100  
Overnight borrowings from Federal Home Loan Bank 115,300 0
Municipal letters of credit from Federal Home Loan Bank 90,000 110,000
Long-term fixed rate borrowings $ 9,200 0
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member] | Federal Home Loan Bank 0% Development Advance Program [Member]    
Borrowings [Abstract]    
Interest rate 0.00%  
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member] | Federal Home Loan Bank 0% Development Advance Program [Member] | Federal Home Loan Bank Maturity Period One [Member]    
Borrowings [Abstract]    
Long-term fixed rate borrowings $ 4,400  
Long term fixed interest rate 5.70%  
Maturity Period, fixed rate Sep. 30, 2024  
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member] | Federal Home Loan Bank 0% Development Advance Program [Member] | Federal Home Loan Bank Maturity Period Two [Member]    
Borrowings [Abstract]    
Long-term fixed rate borrowings $ 4,800  
Long term fixed interest rate 5.20%  
Maturity Period, fixed rate Mar. 31, 2025  
Federal Reserve Bank [Member]    
Line of credit facility [Abstract]    
Amount outstanding $ 0 $ 0
Collateral amount available to be pledged against potential borrowings 46,700  
Other Financial Institution [Member] | The Bank of Greene County [Member]    
Line of credit facility [Abstract]    
Maximum borrowing capacity $ 75,000  
Number of other financial institutions | Institution 3