The Chief Justice and the associate justices of the Supreme Court and the judges of the Court of Criminal Appeals and the Court of Civil Appeals shall serve as members of such conference until their designations are changed. The first circuit judges and lawyers shall be appointed one for a term of one year, one for a term of two years and one for a term of three years. Thereafter, their successors shall be appointed for terms of three years. The first district and municipal judges shall be appointed, one for a term of two years and one for a term of three years. Thereafter, their successors shall be appointed for terms of three years. The probate judge shall be appointed for a term of three years, and his successors shall be appointed for three-year terms.