Every Supervisor of General Assistance, including an Interim Supervisor of General Assistance appointed as provided in Section 12-21.10, shall execute to the governmental unit which he serves an official bond in a penal sum and with sureties to be fixed and approved by the governing body thereof, and, in the case of a township, as fixed and approved by the board of town trustees, conditioned for the faithful discharge of his duties and the due application of all funds and property which shall come to his hands as such Supervisor. If the local governmental unit receives State funds in accordance with the provisions of this Code, the amount and surety of the bond shall be subject to the further approval of the Illinois Department.