Great magnolia images; bet you took those several months ago in Raleigh. Help us by noting dates on things like this.
If you had the chance, you should show the WHOLE plant, along with detail images such as you have provided.
I don't disagree with the Star Magnolia suggestions. I would add that this could also be Magnolia x loebneri, which is commonly grown in southern states, has flowers like this, and as a hybrid has Magnolia stellata as one of its parents.
Loebner Magnolia and Star Magnolia differ markedly in their habits (growth form). Seeing the whole plant can help tell the difference.