An alien insurance company may not engage in the business of insurance in this state without first depositing with the comptroller, for the benefit of the company’s policyholders who are citizens or residents of the United States, bonds or securities of the United States or this state in an amount at least equal to:
(1) the minimum capital required to be maintained by a domestic stock insurer authorized to engage in the same kind of insurance; or
(2) one-half the minimum unencumbered surplus required to be maintained by a domestic mutual insurer authorized to engage in the same kind of insurance.