(a) A corporate trustee which is subject to regulation and supervision by territorial or federal authorities may deposit with itself trust funds which are being held necessarily pending investment, distribution, or the payment of debts, provided it pays into the trust for such deposit such interest as it is required by statute to pay on uninvested trust funds, or, if there be no such statute, the same rate of interest it pays upon similar non-trust deposits, and maintains in its trust department as security for all such deposits a separate fund consisting of securities legal for trust investments and at all times equal in total market value to the amount of the deposits. But no such security shall be required to the extent that the deposit is insured or given a preference by any territorial or federal law.
(b) The separate fund of securities shall be marked as such. Withdrawals from or additions to it may be made from time to time, as long as the required value is maintained. The income of such securities shall belong to the corporate trustee. In all statements of its financial condition published, or delivered to Banking Board, such corporate trustee shall show as separate items the amount of trust funds which it has deposited with itself and the amount of securities which it holds as security for the payment of such deposits.