(a) Public agency bonds are legal and authorized investments for:
(1) a bank;
(2) a savings bank;
(3) a trust company;
(4) a savings and loan association;
(5) an insurance company;
(6) a fiduciary;
(7) a trustee;
(8) a guardian; and
(9) a sinking fund of a municipality, county, school district, or other political subdivision of the state and other public funds of the state, including the permanent school fund.
(b) Public agency bonds may secure the deposits of public funds of the state or a municipality, county, school district, or other political subdivision of the state. The bonds are lawful and sufficient security for deposits to the extent of their value, if accompanied by all unmatured coupons.