Idaho Code § 39-1457A

All moneys received pursuant to the authority of this act whether as proceeds from the sale of bonds, notes or other obligations or as revenues or receipts shall be deemed to be trust funds to be held and applied solely as provided in this act. Any officer with whom, or any bank or trust company with which, such moneys shall be deposited shall act as trustee of such moneys and shall hold and apply the same for the purposes of this act, subject to such regulations as this act and the resolution authorizing the bonds, notes or other obligations of any issue or the trust agreement securing such obligations shall provide.