Idaho Code § 72-910

The state treasurer shall be the custodian of the state insurance fund, and all disbursements therefrom shall be paid by him upon warrants signed by the state controller, or upon sight drafts signed by the state insurance manager as provided by section 72-927, Idaho Code. The state treasurer shall give a separate and additional bond in an amount to be fixed by the governor, and with sureties approved by him, conditioned for the faithful performance of his duty as custodian of the state insurance fund. The state treasurer may deposit any portion of the said fund not needed for immediate use, in the manner and subject to all the provisions of law respecting the deposit of other state funds by him. Interest earned by such portion of the state insurance fund deposited by the state treasurer shall be collected by him and placed to the credit of the fund.