Mo. Rev. Stat. § 375.360
No note or obligation given by any stockholder, whether secured by deed of trust, mortgage or otherwise, shall be considered as payment of any part of the capital stock; and no loan of any money shall be made by any such company to any director, trustee, officer or agent thereof when such company is insolvent, and the failure to collect such loans before the company shall have been adjudged insolvent shall be prima facie evidence of its insolvency at the time such loan was made; and if any such loan shall be made, the persons making it, or who shall assent thereto, shall be jointly and severally liable to the company for the amount of such loan and the interest; provided, however, that this shall not apply to premium notes given by directors, trustees, officers or agents who are also policyholders in such company, when given in the usual course of business of such company in issuing policies.
§ 375.360, RSMo