15 ILCS 520/20

No financial institution holding moneys deposited therewith by the State Treasurer, in accordance with the provisions of this Act, or otherwise, and no officer of any such financial institution, or other person, shall pay to, withhold for the benefit of, or contract in any manner for the payment to such State Treasurer, or to any other person for him or her, of any interest, or other fee, perquisite, or emolument, on account of the deposit of such moneys, except such interest as shall be paid to such State Treasurer for the benefit of the State.