N.C. Gen. Stat. § 47-10

No acknowledgment or proof of execution, including privy examination of married women, of any mortgage, or deed of trust executed to secure the payment of any indebtedness to any banking corporation, taken prior to the first day of January, 1929, shall be held invalid by reason of the fact that the officer taking such acknowledgment, proof or privy examination, was a stockholder or director in such banking corporation.