Cal. Civ. Proc. Code § 488.455
(c) The levying officer shall serve a copy of the writ of attachment and a notice of attachment on any third person in whose name any deposit account described therein stands. That service shall be made personally or by mail as follows:
(e) During the time the attachment lien is in effect, the financial institution is not liable to any person for any of the following:
(f) For the purposes of this section, none of the following is a third person in whose name the deposit account stands:
(h) When a deposit account has been attached, as an alternative to paying the amount of the deposit account that is attached to the levying officer as required by Section 488.600, the financial institution may continue to hold the deposit account until the deposit account is levied upon after judgment in the action or is earlier released, the deposit account to be held in one of the following manners:
(2) If less than the entire deposit account is attached: