The business and affairs of the corporation shall be managed and conducted by a board of directors, a president, a vice-president, a secretary, a treasurer, and such other officers and such agents as the corporation by its bylaws shall authorize. The board of directors shall consist of such number, not less than eleven (11) nor more than twenty-one (21), at least two-thirds (2/3) of which directors shall be officers or employees of members, as defined in section 26-2401, Idaho Code, as shall be determined in the first instance by the incorporators and thereafter annually by the stockholders of the corporation. The board of directors may exercise all the powers of the corporation except such as are conferred by law or by the bylaws of the corporation upon the stockholders or members and shall choose and appoint all the agents and officers of the corporation and fill all vacancies except vacancies in the office of director which shall be filled as hereinafter provided. The board of directors shall be elected in the first instance by the incorporators and thereafter at the annual meeting, which annual meeting shall be held during the month of January, or, if no annual meeting shall be held in the year of incorporation, then within ninety (90) days after the approval of the articles of incorporation at a special meeting as hereinafter provided. The directors shall hold office until the next annual meeting of the corporation or special meeting held in lieu of the annual meeting after the election and until their successors are elected and qualified unless sooner removed in accordance with the provisions of the by-laws. Any vacancy in the office of a director shall be filled by the directors.