Cal. Fin. Code § 1900
Any bank may, with the consent of the commissioner, upon such conditions and under such regulations as the commissioner may prescribe, invest in the stock of one or more corporations organized under the laws of the United States for the purpose of engaging in international or foreign banking or other international or foreign financial operations, or in banking or other financial operations in a dependency or insular possession of the United States, either directly or through the agency, ownership or control of local institutions in foreign countries, or in dependencies or insular possessions of the United States and to act when required by the Secretary of the Treasury of the United States as fiscal agents of the United States; provided, however, that the aggregate amount of stock held in all corporations engaged in business of the kind described in this chapter shall not exceed 10 percent of the subscribing bank's shareholders' equity.
Ca. Fin. Code § 1900