A domestic mutual insurer, after being authorized to transact one kind of insurance, may be authorized by the director to transact the additional kinds of insurance that are permitted under AS 21.09.060 while otherwise in compliance with this title and while maintaining unimpaired surplus funds in an amount not less than the amount of paid-in capital stock required of a domestic stock insurer transacting like kinds of insurance, subject further to the additional expendable surplus requirements of AS 21.09.080 applicable to such a stock insurer.