Idaho Code § 67-427
There is hereby created a legislative council which shall consist of the president pro tempore of the senate, the speaker of the house of representatives, the majority and minority floor leaders of each house, two (2) senators to be selected by the members of the majority party in the senate, two (2) senators to be selected by the members of the minority party in the senate, two (2) representatives to be selected by the members of the majority party in the house of representatives and two (2) representatives to be selected by the members of the minority party in the house of representatives. The council shall meet at least two (2) times each year or as may be necessary as provided for in section 67-430, Idaho Code. Members of the council shall hold office for two (2) years concurrent with the first and second regular sessions of the legislature until the organization of the council during the following first regular session. The legislative council shall appoint members to fill any vacancies that occur during the interim. Provided however, that any member so appointed shall be from the same house and the same political party as the member whose seat was vacated. Such member shall serve until the next regular legislative session. During the next regular legislative session, the members of the same house and the same political party as the member whose seat was vacated shall elect a member to fill the vacancy for the unexpired term of his predecessor.
Idaho Code § 67-427