Del. Code tit. 17 § 416
Bonds issued under the authority of this chapter are made securities in which all state and municipal officers and administrative departments, boards and commissions of the State, all banks, bankers, savings banks, trust companies, saving and loan associations, investment companies and other persons carrying on a banking business, all insurance companies, insurance associations and other persons carrying on an insurance business, and all administrators, executors, guardians, trustees and other fiduciaries, and all other persons whatsoever, who now or may hereafter be authorized to invest in bonds or other obligations of the State, may properly and legally invest any funds, including capital belonging to them or within their control; and such bonds are made securities which may properly and legally be deposited with and received by any state, county or municipal officer or agency of the State for any purpose for which the deposit of bonds or other obligations of the State is now or may after July 27, 1955 be authorized by law.
17 Del. C. § 416