FirstSun Capital Bancorp, a bank holding company, and Sunflower Bank, a bank operator, completed the acquisition of Pioneer Bancshares, a bank operator. Financial terms were not disclosed. "We are thrilled to welcome Pioneer Bank's customers and associates to the Sunflower family. We believe the additions brought by Pioneer will complement our growing presence in Texas and will be a perfect fit with our existing customer base and relationship-driven philosophy," Mollie Carter, FirstSun Chairman.