Del. Code tit. 16 § 1418
Bonds issued under this chapter are made securities in which all public officers and public agencies of the State and its political subdivisions, and all bonds, trust companies, savings and loan associations, investment companies and others carrying on a banking business, all insurance companies and insurance associations and others carrying on an insurance business, all administrators, executors, guardians, trustees and other fiduciaries and other persons may legally and properly invest funds, including capital in their control or belonging to them. Such bonds are made securities which may properly and legally be deposited with and received by any state or municipal officer or any agency or political subdivision of the State for any purpose for which the deposit of bonds or other obligations of the State is now or may hereafter be authorized by law.
16 Del. C. § 1418