The company was formed in 1983 to purchase a former Allied Bank branch in Edna, Texas. The Edna bank dated back to 1949 as the First National Bank of Edna.
In July 2012, the company acquired the 37-branch American State Bank, which provided the company its first locations in West Texas.[4]
In April 2013, the company acquired Coppermark Bank and its nine branches, including six branches in Central Oklahoma, its first presence outside Texas.[5]
In November 2013, the company acquired First Victoria National Bank and its 34 branches.[6]
In April 2014, the company acquired F&M Bancorporation and its 13 branches, including several in Tulsa, Oklahoma.[7]
In April 2024, the merger of Prosperity Bancshares and Lone Star State Bancshares and subsidiaries of LS Bancshares and Prosperity Bank was completed. The end of the operational integration is 28 October 2024.[10]