(a) A corporate trustee that is subject to regulation and supervision by state or federal authorities may deposit with itself trust funds that are being held out of necessity pending investment, distribution, or payment of debts if the corporate trustee
(1) pays into the trust for the deposit the interest the corporate trustee is required by state or federal law to pay on uninvested trust funds or, if there is not a state or federal law requiring the payment of interest, at the same rate of interest the corporate trustee pays on similar nontrust deposits; and
(2) maintains in its trust department as security for the deposit a separate fund consisting of securities that are legal for trust investments and that are at all times equal in total market value to the amount of the deposit, except that the security is not required to the extent that the deposit is insured or given a preference by state or federal law.
(b) The separate fund of securities required by (a)(2) of this section shall be marked as a separate fund for (a)(2) of this section. Withdrawals from or additions to the separate fund may be made from time to time, as long as the required value is maintained. The income of the securities in the separate fund belongs to the corporate trustee. In the statements of its financial condition published or delivered to the Department of Commerce, Community, and Economic Development, the corporate trustee shall show as separate items the amount of trust funds that it has deposited with itself and the amount of securities that it holds as security for the payment of the deposits.