Each covered institution may invest its operating funds in any obligations or securities that are considered legal investments for public funds in accordance with Chapter 45 (§ 2.2-4500 et seq.) of Title 2.2. Such institution’s governing board shall adopt written investment guidelines that provide that such investments shall be made solely in the interest of the covered institution and shall be undertaken with the care, skill, prudence, and diligence under the circumstances then prevailing that a prudent person acting in a like capacity and familiar with such matters would use in the conduct of an enterprise of a like character and with like aims.