A Will was notarized at a local bank, it appears that the notary was the only witness. Without 2 witnesses is the Will invalid?

I'm the Executor named in the Will for a friend's father's estate. The Will was notarized at a local bank, however it appears that the notary was witness #1 and witness #2. He is no longer employed by the bank, and cannot be located (the NC Secretary of State's office only has his contact info when he was at the bank). If the Will is invalid we will probably submit as if the decedent's estate is intestate.