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Balances at other banks	12 Months Ended
Balances at other banks	Jun. 30, 2019
Balances at other banks [Abstract]
Balances at other banks	Note 2. Balances at other banks The Bank of Greene County is required to maintain certain reserves of vault cash and/or deposits with the Federal Reserve Bank. The amount of this reserve requirement, included in cash and due from banks, was $3.3 million and $2.9 million at June 30, 2019 and 2018, respectively.