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Welcome to Missouri. The show me state. First Security Bank was originally established on June 3rd, 1890 in Union Star, Missouri. After over 110 years of growth in Union Star, the decision was made to establish another facility. On April 2nd, 2001, First Security Bank opened its new facility in Trimble, Missouri. The Trimble area was chosen because it fit well into First Security Bank's goal to remain a small community bank.