Cal. Fin. Code § 1605
Any court having jurisdiction of any executor, administrator, guardian, conservator, assignee, receiver, depositary, or trustee, upon the application of any such officer or trustee or upon the application of any person having an interest in the estate or property administered by such officer or trustee, after such notice to the other parties in interest as the court may direct, or without notice if all parties in interest consent thereto, and after a hearing upon such application, may authorize or direct such officer or trustee, whether such person has duly qualified or not, to deposit any moneys then in his hands or which may come into his hands thereafter, and such portion or all of the personal assets of such estate as the court shall deem proper for safekeeping, with any such trust company. Upon such deposit being made the court shall by an order of record reduce the bond to be given, or theretofore given, by such officer or trustee so as to cover only the estate remaining in the hands of such officer or trustee. The money and property so deposited shall thereupon and thereafter be held by such trust company under the order and direction of the court.
Such trust company shall not be required to give any bond or security, except as provided in this division, in case of any deposit of moneys or other personal assets with it under this section. Its responsibility for the safekeeping of personal assets so deposited with it shall be that of a bailee for hire.
Ca. Fin. Code § 1605