Mich. Comp. Laws § 500.5424

Sec. 5424. The management of the business and affairs of such an insurer shall be vested in a board of directors. Every such insurer shall have not less than 5 nor more than 17 directors, and such officers as shall be provided for in the articles of incorporation or in the bylaws. The directors shall be elected at the annual meetings of the members but any time after the first annual meeting the directors may be divided into 3 groups as nearly equal as possible and thereafter 1 group only elected in a manner to be provided by the bylaws.