Zions Bancorporation originated as Keystone Insurance and Investment Co., a Utah Corporation, in April 1955. In April 1960, Keystone, together with several individual investors, acquired a 57.5 percent interest in Zions First National Bank from the LDS Church. In 1965, the name of the company was changed to Zions Bancorporation. (However, it operated as Zions Utah Bancorporation from 1966 to 1987.) The first public offering of shares in Zions Bancorporation was made in January 1966. There continued to be some minority shareholders until April 1972, when the company exchanged the remaining minority shares for common shares.