Sec. 351.156. BONDS AS INVESTMENTS; BONDS AS SECURITY FOR DEPOSITS. (a) District bonds are legal and authorized investments for:(1) banks;(2) trust companies;(3) savings and loan associations;(4) insurance companies;(5) fiduciaries;(6) trustees;(7) guardians; and(8) sinking funds of municipalities, counties, school districts, and other political subdivisions of the state and other publ