Mo. Rev. Stat. § 362.420: Prohibition of banking business.

No corporation, domestic or foreign, other than a corporation formed under or subject to the banking laws of this state or of the United States, except as permitted by such laws, shall by any implication or construction be deemed to possess the power of carrying on the business of discounting bills, notes or other evidences of debt, of receiving deposits, of buying and selling bills of exchange, or of issuing bills, notes or other evidences of debt for circulation as money, or of engaging in any other form of banking.