California Code, Financial Code - FIN § 5705

After the meeting of the stockholders and members, the association shall take any action necessary to make it a federal association, and promptly after receipt of the federal charter the association shall file in the office of the commissioner and in the office of the Secretary of State, a copy of the charter issued to it by the Office of Thrift Supervision or a certificate showing the organization of the association as a federal association certified by or on behalf of the Office of Thrift Supervision.  Upon the filing of this instrument in the office of the Secretary of State the association ceases to be a state association and is a federal association.