Domestic insurance companies may invest in obligations for the payment of money secured by real estate mortgages or deeds of trust which are either guaranteed or insured by the United States, any state, territory, or district thereof, or by any agency, instrumentality, or political subdivision of one or more of the foregoing, if any such investment which is in excess of the value limitation set forth in section 10-3-216(1)(a) is so insured or guaranteed.
C.R.S. § 10-3-217