Idaho Code § 70-1406: Vacancy — How caused.

A vacancy in the office of port commissioner shall occur by death, resignation, removal from office, conviction of a felony, non-attendance at meetings of the port commission for a period of sixty (60) days unless excused by the port commission, by any statutory disqualification, by the removal of any commissioner of his residence from the port district, or by any permanent disability preventing the proper discharge of his duty.