v3.26.1
Schedule of Assets (Held at End of Year) - Schedule of Assets (Held at End of Year) (Details) - The Bank of Greene County Employees’ Savings and Profit Sharing Plan and Trust [Member] - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Schedule of Assets (Held at End of Year) [Abstract]    
Notes receivable from participants [1] $ 282,996  
Total Investments $ 25,014,980  
Notes Receivable from Participants [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Party-in-interest [1] true  
Investment, Identifier [Axis]: American Funds Europacific GR R6 [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party American Funds Europacific GR R6 [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 334,978  
Investment, Identifier [Axis]: Dodge & Cox Income [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Dodge & Cox Income [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 282,345  
Investment, Identifier [Axis]: Federated Government Obligation Fund [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Federated Government Obligation Fund [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Money Market Account [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 173,229  
Investment, Identifier [Axis]: Greene County Bancorp, Inc. Common Stock [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Party-in-interest [1] true  
Identity of issuer, borrower, lessor, or similar party [1] Greene County Bancorp, Inc. Common Stock [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value [1] Common Stock Fund- Employer Stock [Member]  
Participant-directed status [1],[2] Participant-Directed Investments [Member]  
Current value [1] $ 3,989,396  
Investment, Identifier [Axis]: Invesco Global Fund R6 [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Invesco Global Fund R6 [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 837,191  
Investment, Identifier [Axis]: LSV Value Equity [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party LSV Value Equity [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 519,286  
Investment, Identifier [Axis]: MFS Massachusetts Investors TR R6 [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party MFS Massachusetts Investors TR R6 [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 658,269  
Investment, Identifier [Axis]: Reliance Trust Company Stable Value Collective Trust - Series 25053 [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Reliance Trust Company Stable Value Collective Trust - Series 25053 [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Common Collective Trust Fund [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 503,973  
Investment, Identifier [Axis]: Self-Directed Brokerage Accounts [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Self-Directed Brokerage Accounts [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 3,157,141  
Investment, Identifier [Axis]: T. Rowe Price Blue Chip Growth [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party T. Rowe Price Blue Chip Growth [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 2,642,607  
Investment, Identifier [Axis]: Vanguard 500 Index Admiral [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard 500 Index Admiral [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 750,164  
Investment, Identifier [Axis]: Vanguard Inflation-Protected Secs Adm [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Inflation-Protected Secs Adm [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 135,684  
Investment, Identifier [Axis]: Vanguard Mid Cap Index Adm [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Mid Cap Index Adm [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 1,173,384  
Investment, Identifier [Axis]: Vanguard Small Cap Index Adm [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Small Cap Index Adm [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 1,153,092  
Investment, Identifier [Axis]: Vanguard Target Retirement 2020 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2020 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 123,659  
Investment, Identifier [Axis]: Vanguard Target Retirement 2025 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2025 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 716,190  
Investment, Identifier [Axis]: Vanguard Target Retirement 2030 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2030 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 1,735,172  
Investment, Identifier [Axis]: Vanguard Target Retirement 2035 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2035 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 960,676  
Investment, Identifier [Axis]: Vanguard Target Retirement 2040 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2040 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 1,731,603  
Investment, Identifier [Axis]: Vanguard Target Retirement 2045 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2045 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 700,439  
Investment, Identifier [Axis]: Vanguard Target Retirement 2050 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2050 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 446,524  
Investment, Identifier [Axis]: Vanguard Target Retirement 2055 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2055 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 879,535  
Investment, Identifier [Axis]: Vanguard Target Retirement 2060 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2060 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 607,076  
Investment, Identifier [Axis]: Vanguard Target Retirement 2065 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2065 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 233,812  
Investment, Identifier [Axis]: Vanguard Target Retirement 2070 Inv. [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement 2070 Inv. [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 25,558  
Investment, Identifier [Axis]: Vanguard Target Retirement Income Inv [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Target Retirement Income Inv [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 64,498  
Investment, Identifier [Axis]: Vanguard Value Index Adm [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Identity of issuer, borrower, lessor, or similar party Vanguard Value Index Adm [Member]  
Description of investment including maturity date, rate of interest, collateral, par, or maturity value Mutual Funds [Member]  
Participant-directed status [2] Participant-Directed Investments [Member]  
Current value $ 196,503  
Minimum [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Notes receivable from participants, interest rate 4.25% [1] 4.25%
Maximum [Member]    
Schedule of Assets (Held at End of Year) [Abstract]    
Notes receivable from participants, interest rate 9.50% [1] 9.50%
[1] Party-In-Interest
[2] Historical cost has not been presented since this investment is participant-directed.