S.C. Code Ann. § 34-21-360

A trust institution shall not invest any of its own funds in a common trust fund administered by it, and if the trust institution, because of a creditor relationship or for any other reason, acquires any interest in a participation in such common trust funds, the participation shall be withdrawn on the first date on which such withdrawal can be effected. However, in no case shall an unsecured advance to an account holding a participation until the time of the next withdrawal be deemed to constitute the acquisition of an interest by the trust institution.