(1) No captive insurance company issued a certificate of authority shall be permitted to do any business in this state unless it maintains total capital and surplus of not less than five hundred thousand dollars.

(1.5) Upon a written finding by the commissioner that the approved plan of operation or the operational results of the captive insurance company require either additional capital or a larger surplus than required by this section, the commissioner may require that additional capital or surplus, or both, be obtained. Additional capital or surplus may be tendered in the form of an irrevocable letter of credit as set forth in subsection (2) of this section.

(2) Securities acceptable to the commissioner in the amount of three hundred thousand dollars, or such greater amount as determined by the commissioner, shall be held by the commissioner or under the joint control of the commissioner and the captive insurance company. The commissioner shall accept an irrevocable letter of credit, in a form acceptable to the commissioner, issued or confirmed by a qualified United States financial institution as defined in section 10-1-102 (17) on behalf of a captive insurance company in lieu of securities. All securities or letters of credit jointly held shall be the sole property of such captive insurance company and shall be free and clear of any claim or encumbrance.

(3) Jointly held securities or letters of credit, wherever located, shall be deemed to be held for the benefit of all captive insurance company policyholders.

(4) The commissioner shall release funds held under joint control upon a showing satisfactory to the commissioner that all debts, obligations, and liabilities of the captive insurance company have been paid and discharged, or adequate provisions for payment and discharge have been made therefor, and the captive insurance company's original certificate of authority has been returned to the commissioner.