You might not know it, but the First Financial Bank – with branches at 300 North Main Street, Middletown and 815 South Breiel Boulevard, Middletown, has a long history in Middletown. What is now First Financial Bank was once smorgasbord of different banks that merged over the years. In Middletown, First Financial Bank can trace its origins all they way back to the First National Bank of Middletown, which incorporated on July 12, 1865 and opened for business on September 2, 1865.