Nothing contained in this Code shall authorize trust companies, covered by or eligible for insurance coverage by the Federal Deposit Insurance Corporation, to establish branch offices within this state. As used in this section, “branch office” includes, but is not limited to, any additional agency, office or other facility located within this state at which business is conducted. Provided, however, this section shall not be effective as to any such “branch office” in existence at the time and date of the enactment hereof, nor shall it be so construed as to prohibit the establishment of agents or agencies for the sole purpose of conducting the business of title insurance or abstracting.