The commissioner of financial institutions (hereinafter “the commissioner”) may grant a certificate of authority to any Tennessee corporation organized under this chapter for the purpose of engaging in international or foreign banking or other international or foreign financial operations; provided, that the corporation's charter is sufficiently limited so that no corporation organized under this chapter may carry on any part of its business in Tennessee or in the United States, except business that, in the opinion of the commissioner, is incidental to its international or foreign business.