S.C. Code Ann. § 38-9-70: Insurers may make deposits to do business in other states.

The director or his designee in his official capacity shall take and hold, in trust, deposits made by domestic insurers for the purpose of complying with the laws of any other state to enable the insurer to do business in that state. The insurer making the deposit is entitled to the income and may with the consent of the director or his designee and when not forbidden by the law under which the deposit is made, change, in whole or in part, the securities which compose the deposit for other solvent securities of equal par value approved by the director or his designee.