California Code, Financial Code - FIN § 1600

(a) It may act, or may be appointed by any court to act, in like manner as an individual, as executor, administrator, guardian or conservator of estates, assignee, receiver, depositary, trustee, custodian, or in any other fiduciary or representative capacity for any purpose permitted by law, may act as transfer agent or registrar of corporate stocks and bonds, may buy and sell securities for the account of customers, and may accept and execute any trust business permitted by any law of this or any other state or of the United States to be taken, accepted, or executed by an individual;  and

(b) A trust company, upon becoming a member of the Federal Reserve System, shall continue to have such powers as may then or thereafter be conferred upon it by the laws of this state, subject to such federal rules, regulations, and laws as may govern state banks exercising trust powers or trust companies which become members of the Federal Reserve System.