Idaho Code § 26-2107
Any person, corporation, copartnership or association, except a credit union organized under the provisions of this chapter, an interstate credit union with a permit issued under section 26-2152, Idaho Code, the federal credit union act, 48 Statute 1216 (1934), 73 Statute (1959), 12 U.S.C. 192, or the Idaho credit union league, a recognized chapter of the Idaho credit union league, using a name or title containing the words "credit union" or any derivation thereof or representing themselves in their advertising or otherwise conducting business as a credit union shall be fined not more than one thousand dollars ($1,000) or imprisoned not more than one (1) year, or both, and may be permanently enjoined from using such words in its name.
Idaho Code § 26-2107