Colo. Rev. Stat. § 24-75-604
All savings banks, insurance companies, assurance, casualty, fidelity, and guaranty companies, and savings and loan associations which are permitted or directed by the laws of the state of Colorado to invest any of their moneys or deposits in securities may invest such moneys or deposits in bonds issued by any federal land bank or joint-stock land bank organized pursuant to an act of congress known as the "Farm Credit Act of 1971", and acts amendatory thereto. Such bonds shall be accepted as security for all public deposits and in all cases where bonds are required by law to be deposited with any department or public official of the state of Colorado; but this section shall not be so construed as to prohibit such moneys or deposits from being invested in such other securities as are provided for by law.
C.R.S. § 24-75-604
For the "Farm Credit Act of 1971", see 85 Stat. 583, 12 U.S.C. §2001 .