Erie State Bank was founded in Monroe in 1974 and in 1988 was acquired by Kalamazoo-based First of America Bank, who later sold the former Erie State Bank branches to Cleveland-based Society National Bank in 1992 to facilitate the upcoming acquisition of Security Bank & Trust. Society merged with Key Bank in 1996.

The Downriver branch was at 23116 Telegraph Road in Brownstown Township and opened on August 23, 1976.