In the US, an insurance company that operates in other states through agents is called a foreign insurance company
. These companies are incorporated from another home-state but can legally operate in other states as well.
The Excalibur Insurance Company, domiciled in Iowa, transacts business legally in Nebraska. In Nebraska, Excalibur is a foreign insurance company.
It is because the Excalibur Insurance Company is incorporated in Iowa so it becomes a foreign company in Nebraska.