Cal. Insurance Code § 11691.2

The deposit required pursuant to Section 11691 shall be security for the payment of the insurer’s obligations on worker’s compensation insurance transacted in this state. The deposit shall not be withdrawn except upon the written order of the commissioner to use the proceeds thereof in payment of compensable worker’s compensation claims and expenses as provided in Section 11698.02, or as otherwise provided in this article, but shall be forthwith payable to the commissioner or at the direction of the commissioner by the Treasurer or the bank, savings and loan association, or trust company approved by the commissioner upon that order. No deposit so placed with a bank, savings and loan association, or trust company shall be subject to any lien or claim asserted by it or be subject to any disposition obligation, demand, liability, cause of action, judgment, or other claim, or cost or expense attendant thereon, other than as is permitted by the commissioner. Notwithstanding any other provisions of this code, the deposit shall be retained by the Treasurer or the bank, savings and loan association, or trust company approved by the commissioner and only released in accordance with the provisions of this article or pursuant to regulations or a written order of the commissioner.