v3.25.2
Borrowings (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2025
USD ($)
Institution
Jun. 30, 2024
USD ($)
Sep. 15, 2021
USD ($)
Investor
Sep. 17, 2020
USD ($)
Investor
Borrowings [Abstract]        
Long-term fixed rate borrowings $ 4,189 $ 34,156    
Amount outstanding 0 0    
Other long-term borrowings $ 0      
Bank Term Funding Program [Member]        
Borrowings [Abstract]        
Maximum borrowing capacity   $ 25,000    
Interest rate   4.80%    
Maturity period Jan. 31, 2025      
Subordinated Note Purchase Agreements Entered on September 17, 2020 [Member]        
Borrowings [Abstract]        
Number of qualified institutional investors (in Investor) | Investor       14
Interest rate       4.75%
Debt instrument, due date Sep. 17, 2030      
Aggregate principal amount       $ 20,000
Debt issuance costs       $ 424
Period of debt amortization 60 months      
Outstanding borrowings, net of issuance costs $ 20,000 $ 19,900    
Subordinated Note Purchase Agreement Entered on September 15, 2021 [Member]        
Borrowings [Abstract]        
Number of qualified institutional investors (in Investor) | Investor     18  
Interest rate     3.00%  
Debt instrument, due date Sep. 15, 2031      
Aggregate principal amount     $ 30,000  
Debt issuance costs     $ 499  
Period of debt amortization 60 months      
Outstanding borrowings, net of issuance costs $ 29,900 29,800    
Federal Home Loan Bank of New York [Member]        
Borrowings [Abstract]        
Loans pledged as collateral 634,600 601,600    
Federal Reserve Bank [Member]        
Borrowings [Abstract]        
Collateral amount available to be pledged against potential borrowings 18,200      
Amount outstanding 0 0    
The Bank of Greene County [Member]        
Borrowings [Abstract]        
Maximum borrowing capacity 15,000      
The Bank of Greene County [Member] | Federal Home Loan Bank of New York [Member]        
Borrowings [Abstract]        
Loans pledged as collateral 634,600      
Maximum amount of funding available 389,300      
Long-term fixed rate borrowings 4,200 9,200    
Municipal letters of credit from Federal Home Loan Bank 90,000 90,000    
Overnight borrowings from Federal Home Loan Bank $ 74,000 115,300    
The Bank of Greene County [Member] | Federal Home Loan Bank of New York [Member] | Federal Home Loan Bank 0.0% Development Advance Program [Member]        
Borrowings [Abstract]        
Interest rate 0.00%      
The Bank of Greene County [Member] | Federal Home Loan Bank of New York [Member] | Federal Home Loan Bank Maturity Period One [Member] | Federal Home Loan Bank 0.0% Development Advance Program [Member]        
Borrowings [Abstract]        
Long-term fixed rate borrowings $ 2,200 $ 4,400    
Long term fixed interest rate 3.80% 5.70%    
Maturity Period, fixed rate Oct. 31, 2027 Sep. 30, 2024    
The Bank of Greene County [Member] | Federal Home Loan Bank of New York [Member] | Federal Home Loan Bank Maturity Period Two [Member] | Federal Home Loan Bank 0.0% Development Advance Program [Member]        
Borrowings [Abstract]        
Long-term fixed rate borrowings $ 2,000 $ 4,800    
Long term fixed interest rate 4.20% 5.20%    
Maturity Period, fixed rate Jun. 30, 2028 Mar. 31, 2025    
The Bank of Greene County [Member] | Other Financial Institution [Member]        
Borrowings [Abstract]        
Maximum borrowing capacity $ 75,000      
Number of other financial institutions (in Institution) | Institution 3