First Financial Bank is a regional bank with 67 retail branches operated by First Financial Corporation and based in Terre Haute, Indiana. It is the oldest national bank in Indiana. First Financial Corporation is Vigo Countys only publicly traded company. The bank was founded in 1834 as a branch of the Second State Bank of Indiana and later became known as Terre Haute First National Bank. In 1983, First Financial Corporation was established as the banks holding company, and in August 1984 it became Indianas first multi-bank holding company. After mergers and acquisitions, the various banks affiliated as First Financial Bank in 2003. The bank now operates in Indiana and Illinois. The Morris Plan Company of Terre Haute is a subsidiary of First Financial Corporation.