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Subsequent events	12 Months Ended
Subsequent events	Jun. 30, 2019
Subsequent events [Abstract]
Subsequent events	Note 20. Subsequent events On July 17, 2019, Greene County Bancorp, Inc. announced that its Board of Directors had approved a quarterly cash dividend of $0.11 per share on the Company’s common stock. The dividend reflects an annual cash dividend rate of $0.44 per share which represents a 10.0% increase from the previous annual cash dividend rate of $0.40 per share. The dividend was payable to stockholders of record as of August 15, 2019, and was paid on August 30, 2019. Greene County Bancorp, MHC waived its right to receive this dividend. On July 22, 2019, Greene County Bancorp Inc. opened a new full service branch located at 2927 Route 9, Valatie, NY. The Bank of Greene County now operates 16 full service branches.