 TERRE HAUTE, Ind., Sept. 27, 2021 GLOBE NEWSWIRE -- First Financial Corporation NASDAQ: THFF today announced that its Board of Directors has approved the merger of subsidiary, The Morris Plan Company of Terre Haute, into subsidiary, First Financial Bank N.A. The merger will be effective on December 31, 2021, subject to regulatory approval. The merger will result in increased efficiencies, which will be recognized beginning in the first quarter of 2022. 