Any director, officer or partner of a health maintenance organization who receives, collects, disburses, or invests funds in connection with the activities of such organization shall be fiduciaries of such funds. Every health maintenance organization shall maintain in force a surety bond on such officers and employees in an amount of not less than one hundred thousand dollars, or such other sum as may be prescribed by the director. All such bonds shall be written with at least a one-year discovery period and, if written with less than a three-year discovery period, shall contain a provision that no cancellation or termination of the bond, whether by or at the request of the insured or by the underwriter, shall take effect prior to the expiration of ninety days after written notice of such cancellation or termination has been filed with the director, unless an earlier date of such cancellation or termination is approved by the director.