Idaho Code § 50-601: Qualifications.

Any person shall be eligible to hold the office of mayor who is a qualified elector of the city at the time his declaration of candidacy or declaration of intent is submitted to the city clerk and remains a qualified elector during his term of office.

The term of office of mayor shall be for a period of four (4) years except as otherwise specifically provided. He shall take office at the time and in the manner provided for installation of councilmen.