Exhibit 99.1 News Release FIRST FINANCIAL CORPORATION One First Financial Plaza, Terre Haute, Indiana 47807 (812) 238-6000 First Financial Corporation Reports Third Quarter Results Terre Haute, Indiana, October 22, 2024 – First Financial Corporation (NASDAQ:THFF) today announced results for the third quarter of 2024. During the quarter, the Corporation closed its acquisition of SimplyBank, Dayton, Tennessee. The quarter was impacted by purchase accounting adjustments and charges, which are reflected in the ...