N.C. Gen. Stat. § 54-118
All mutual corporations, companies, or associations heretofore organized and doing business under other incorporation statutes, or which have attempted to so organize and do business, shall have the benefit of all of the provisions of this Subchapter, and be bound thereby on filing with the Secretary of State a written declaration, signed and sworn to by the president and secretary, to the effect that the mutual company or association has by a majority vote of its shareholders decided to accept the benefits of and to be bound by the provisions of this Subchapter. No association organized under this Subchapter shall be required to do or perform anything not specifically required herein, in order to become a corporation.
N.C. Gen. Stat. § 54-118