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Condensed Financial Statements of Greene County Bancorp, Inc. - Condensed Statements of Cash Flows (Details) - Parent Company [Member] - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Condensed Financial Statements of Greene County Bancorp, Inc. [Abstract]    
Net Income $ 41,022 $ 31,138
Adjustments to reconcile net income to net cash provided by operating activities:    
Undistributed earnings of subsidiaries (32,570) (18,401)
Amortization of subordinated debt issuance costs 112 186
Net increase in prepaid expenses and other assets (2) (2)
Net (decrease) increase in accrued expenses and other liabilities (285) 10
Net cash provided by operating activities 8,277 12,931
Cash flows from financing activities:    
Payment of cash dividends (4,049) (4,475)
Purchase of treasury stock (32) 0
Repayment of subordinated notes payable (20,000) 0
Net cash provided by financing activities (24,081) (4,475)
Net decrease in cash and cash equivalents (15,804) 8,456
Cash and cash equivalents at beginning of year 30,925 22,469
Cash and cash equivalents at end of year $ 15,121 $ 30,925