There are many that fit that description. Generally, however, your best bet is to ask persons who have had the opportunity to observe attorneys actually perform, e.g. Clerks of the Court, Judge's clerks, etc.
Call attorneys who may not practice family law (in Idaho Falls and Pocatello) and ask them (or their legal assistants) who are the attorneys "locally" who are known to be "bulldogs" in court in family law matters. If you call 5 such offices and make a list of one to three mentioned, I will bet the same name will be on 4 of the 5 lists!