It shall be unlawful for any bank to advertise that a branch office will be established or available for bank customers until a branch charter has been issued by the director for that branch office under the provisions of chapter 3, title 26, Idaho Code. It shall be unlawful for any person or group of persons to advertise that a unit bank will be established until approval for a bank charter has been issued by the director under the provisions of chapter 2, title 26, Idaho Code.