Idaho Code § 41-711: Corporate obligations.

An insurer may invest any of its funds in obligations other than those eligible for investment under section 41-721, Idaho Code, (mortgage loans and contracts), if they are issued, assumed, or guaranteed by any solvent institution created or existing under the laws of the United States or of any state, district or territory thereof, or of the government of Canada or any province thereof, and if said institution is not in default as to principal or interest on any of its obligations.