(a) A domestic stock insurer shall not pay any cash dividend to stockholders except out of that part of its available surplus funds which is derived from realized net profits on its business.
(b) A stock dividend may be paid out of any available surplus funds in excess of the aggregate amount of surplus loaned to the insurer pursuant to section twenty of this article.
(c) A dividend otherwise proper, may be payable out of the insurer's earned surplus even though its total surplus is then less than the aggregate of its past contributed surplus resulting from issuance of its capital stock at a price in excess of the par value thereof.