(a) If the annual statement of any insurer covering a calendar year shows it to have investments at the close of the year in West Virginia securities, of at least twenty-five percent of its admitted assets, it is entitled to a credit against the premium tax levied by sections fourteen and fourteen-a of this article in an amount equal to one hundred percent of the tax for the calendar year: Provided, That the insurer proves to the satisfaction of the commissioner that it employs less than twenty full-time employees, has gross direct premiums of less than $10 million and derives a minimum of fifty percent of its gross direct premiums from insurance provided to under-served areas of West Virginia.
(b) As used in this section:
(1) "Full-time employees" means all elected officers, all full-time employees, all part-time employees each counted as one-half full-time employee equivalents and all full and part-time equivalent employees of affiliated companies within an insurance holding company system providing any type of service by contract or by any other arrangement;