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Condensed Financial Statements of Greene County Bancorp, Inc. - Condensed Statements of Financial Condition (Details) - Parent Company [Member] - USD ($)
$ in Thousands
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Condensed Financial Statements of Greene County Bancorp, Inc. [Abstract]      
Cash and cash equivalents $ 15,121 $ 30,925 $ 22,469
Investment in subsidiaries 292,956 258,333  
Prepaid expenses and other assets 42 40  
Total assets 308,119 289,298  
LIABILITIES AND SHAREHOLDERS’ EQUITY      
Subordinated notes payable, net 29,979 49,867  
Accrued expenses and other liabilities 309 594  
Total liabilities 30,288 50,461  
Total shareholders’ equity 277,831 238,837  
Total liabilities and shareholders’ equity $ 308,119 $ 289,298