Cal. Ins. Code § 1041
The commissioner shall be the custodian of all moneys collected by him or her or coming into his or her possession in the course of any proceeding under this article, but the commissioner may deposit those moneys, or any part thereof, without court approval in a bank which is a member of the Federal Deposit Insurance Corporation (FDIC), so long as the total deposit did not exceed those federal insurance limits; in a centralized State Treasury system bank account; or in funds administered by the Treasurer.
Provided further, any money which is deposited by the commissioner pursuant to this section, which the commissioner determines is available for investment, may be invested or reinvested by the Treasurer in any of the securities which are described in Article 1 (commencing with Section 16430) of Chapter 3 of Part 2 of Division 4 of Title 2 of the Government Code, or placed in a bank as provided in Chapter 4 (commencing with Section 16500) of Part 2 of Division 4 of Title 2 of the Government Code, and handled in the same manner as money in the State Treasury. Any increment which is received from that investment or reinvestment or deposit shall be remitted to the commissioner for allocation, upon a proper and equitable basis, to each estate participating in the investment, reinvestment, or deposit and deposited and disbursed as provided in Section 1037. The Treasurer may deduct from that remittance an amount equal to the reasonable costs incurred in carrying out this section or may bill the commissioner for those costs and the commissioner shall pay those costs from money which is collected pursuant to this chapter.
Ca. Ins. Code § 1041