Idaho Code § 55-3211

No homeowner's association may add, amend, or enforce any covenant, condition, or restriction in such a way that limits or prohibits the rental, for any amount of time, of any property, land, or structure thereon within the jurisdiction of the homeowner's association, unless expressly agreed to in writing at the time of such addition or amendment by the owner of the affected property. Nothing in this section shall be construed to prevent the enforcement of valid covenants, conditions, or restrictions limiting a property owner's right to transfer his interest in land or the structures thereon as long as that covenant, condition, or restriction applied to the property at the time the homeowner acquired his interest in the property.