(a) Upon receipt of the first installment of the prescribed membership fee from the financial institutions which have agreed to become members of the corporation as provided in this chapter, the corporation may commence its insurance of the deposits and shares of the member financial institutions.

(b) Each insured financial institution may advise its members and advertise that its deposits and shares are insured by the corporation, in such manner established by the directors of the corporation and approved by the department, upon receipt of a notification from the corporation that it has been accepted for membership in the corporation by its directors and upon payment of any required premiums or fees.

(c) The amount of insurance coverage on deposits and shares provided by the corporation may be increased from time to time by the directors of the corporation with the approval of the department; provided, however, that in no event may the insurance be increased to an amount greater than the largest amount insured by the Federal Deposit Insurance Corporation or the National Credit Union Administration.

(d) The corporation may insure or partially insure the uninsured shares and deposits of any financial institution primarily insured by it or some other governmental or private insurance program, at a cost to be determined by the directors of the corporation with the approval of the department, provided the department approves the financial institution for such coverage. Financial institutions having excess deposit insurance coverage shall not be required to be members of the corporation by virtue of such insurance coverage.

(e) No other forms of insurance except that authorized by this Code section may be sold or offered by the corporation.