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Concentrations of Credit Risk	12 Months Ended
Concentrations of Credit Risk	Jun. 30, 2019
Concentrations of Credit Risk [Abstract]
Concentrations of Credit Risk	Note 16. Concentrations of Credit Risk The Bank of Greene County grants residential, consumer and commercial loans to customers primarily located in the mid-Hudson valley region of New York, including Greene County. Over the last several years the Company has emphasized expansion into new markets in southern Albany, Columbia and Ulster counties. Although The Bank of Greene County has a diversified loan portfolio, a substantial portion of its debtors’ ability to honor their contracts is dependent upon employment and other economic factors throughout Greene and its contiguous counties.