Each community building district shall be governed by a board of seven (7) directors. At the first annual meeting seven (7) directors shall be elected by ballot for the following terms: Three (3) for a term of one (1) year and four (4) for a term of two (2) years. Thereafter succeeding directors should be elected for a term of two (2) years. Vacancies shall be filled by appointment by the remaining board members for the unexpired term.