Any domestic mutual aid association which immediately prior to January 1, 1972, lawfully held a certificate of authority or license to transact such business in this state and which is otherwise in compliance with the requirements of this chapter shall be entitled to have a certificate of authority while it has and maintains unimpaired paid-in capital stock, if a stock corporation, or surplus, if a mutual corporation, as follows:

(1) If it is a stock corporation, it must have and maintain capital stock of at least $25,000.00; except, that an association having unimpaired paid-in capital stock on January 1, 1972, in less than such amount shall as of each December 31, following January 1, 1972, have increased its unimpaired paid-in capital stock by an amount equal to not less than 20 percent of such original deficiency, so that, and until not later than the fifth such December 31, the association shall have unimpaired paid-in capital stock of not less than $25,000.00. Such an association shall be entitled to have its certificate of authority continue in effect during such five-year period if it is otherwise entitled thereto under this chapter;

(2) If it is a mutual corporation, it must have and maintain unimpaired surplus funds in the amount of not less than $12,500.00; except, that an association having unimpaired surplus funds on January 1, 1972, in less than such amount shall as of each December 31, following January 1, 1972, have increased its unimpaired surplus funds by an amount equal to not less than 20 percent of such original deficiency, so that, and until not later than the fifth such December 31, the association shall have unimpaired surplus funds of not less than $12,500.00. Such an association shall be entitled to have its certificate of authority continue in effect during such five-year period if it is otherwise entitled thereto under this chapter; and

(3) The commissioner shall promptly revoke the certificate of authority of any such association that does not comply with the requirements of this section.