N.C. Gen. Stat. § 54B-155

The Commissioner of Banks shall, from time to time, promulgate such rules and regulations in respect to loans permitted to be made by State associations as may be reasonably necessary to assure that such loans are in keeping with sound lending practices and to promote the purposes of this Chapter; provided, that such rules and regulations shall not prohibit an association from making any loan which is a permitted loan for federal associations under federal regulatory authority.