Idaho Code § 15-7-203

The court will not, over the objection of a party, entertain proceedings under section 15-7-201 of this Part involving a trust registered or having its principal place of administration in another state, unless (1) when all appropriate parties could not be bound by litigation in the courts of the state where the trust is registered or has its principal place of administration or (2) when the interests of justice otherwise would seriously be impaired. The court may condition a stay or dismissal of a proceeding under this section on the consent of any party to jurisdiction of the state in which the trust is registered or has its principal place of business, or the court may grant a continuance or enter any other appropriate order.