v3.26.1
Condensed Financial Statements of Greene County Bancorp, Inc. - Condensed Statements of Income (Details) - Parent Company [Member] - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
INCOME:    
Equity in undistributed net income of subsidiaries $ 32,570 $ 18,401
Dividend distributed by subsidiary $ 10,000 $ 15,000
Investment, Issuer Affiliation [Extensible Enumeration] us-gaap:InvestmentsInMajorityOwnedSubsidiariesMember us-gaap:InvestmentsInMajorityOwnedSubsidiariesMember
Interest-earning deposits $ 8 $ 19
Total Income 42,578 33,420
OPERATING EXPENSES:    
Legal fees 99 94
Interest on borrowings 1,178 1,850
Other expense 279 338
Total operating expenses 1,556 2,282
Net income $ 41,022 $ 31,138