Idaho Code § 34-503
The legislative district central committee of each political party in each legislative district shall consist of the precinct committeemen representing the precincts within the legislative district, and the legislative district chairman elected by the precinct committeemen. The precinct committeemen within each legislative district shall meet within the legislative district or at a convenient location in a legislative district contiguous to the legislative district, or at a convenient location in a county in which any portion of the legislative district sits, within eleven (11) days after the primary election, the meeting time and place to be designated by the incumbent legislative district chairman. At this meeting the precinct committeemen shall organize by electing a chairman, vice chairman, a secretary and such other officers as they may desire, who shall hold office at the pleasure of the legislative district central committee or until their successors are elected.
Unless state party rules, adopted as provided in section 34-506, Idaho Code, provide otherwise, when a vacancy exists in the office of legislative district central committee chairman, it shall be the duty of the state central committee chairman to call a meeting of the precinct committeemen of the legislative district, and the precinct committeemen shall proceed to elect a chairman of the legislative district central committee for the balance of the unexpired term.
Idaho Code § 34-503