Greene County Bancorp, Inc. operates as the holding company of The Bank of Greene County (the Bank). The Bank's principal business consists of attracting retail deposits from the general public in the areas surrounding its branches and investing those deposits, together with funds generated from operations and borrowings, primarily in residential mortgage loans, commercial real estate mortgage loans, consumer loans, home equity loans and commercial business loans. In addition, The Bank invests a significant portion of its assets in state and political subdivision securities and mortgage-backed securities. The Bank offers investment alternatives for customers. The Bank operates a subsidiary, Greene County Commercial Bank, which receives deposits only to the extent of accepting for deposit the funds of the United States and the state of New York and their respective agents, authorities and instrumentalities, and local governments. The Bank also operates a real estate investment trust.