Idaho Code § 31-4312

The treasurer shall have custody of all funds belonging to the district, shall keep accurate accounts of all such district funds, shall keep all district funds in the banks or investments designated by the board, shall have custody of the financial records of the district, shall pay out district funds only upon legally authorized checks or warrants signed by the treasurer and countersigned by the president, shall perform all other duties which are provided in this act to be performed by the treasurer or which are directed or authorized by the board, and shall execute and file with the secretary an official bond in an amount to be fixed by the board but the costs of such bond shall be paid from district funds.