The board of directors must be elected in the first instance by the incorporators and after that time at each annual meeting of the corporation or, if no annual meeting is held in any year, at the time fixed by the bylaws, at a special meeting held in lieu of the annual meeting. At each annual meeting, or at each special meeting held in lieu of the annual meeting, the members of the corporation shall elect two-thirds of the board of directors, and the stockholders shall elect the remaining directors in the manner prescribed in the charter of the corporation. The directors must hold office until the next annual meeting of the corporation or special meeting held in lieu of the annual meeting after their election and until their successors are elected and qualified unless sooner removed in accordance with the provisions of the bylaws. A vacancy in the office of a director elected by the members must be filled by the directors elected by the members, and a vacancy in the office of a director elected by the stockholders must be filled by the directors elected by the stockholders.