(a) Amendments to the articles of incorporation of a domestic insurer shall be made by a majority vote of its board of directors and the vote or written assent of two-thirds of its voting capital stock, or two-thirds of the members (if a mutual insurer) voting at a valid meeting of members.
(b) The president and secretary of the insurer shall, under the corporate seal, certify the amendment in quadruplicate, and file it in the offices of the Lieutenant Governor, the Commissioner, the Clerk of the District Court, and the insurer, as required under this title for original articles of incorporation. Thereupon, subject to the requirements of section 351 of this title relative to increase of capital stock of a stock insurer, the amendment shall become effective.