Idaho hasn't voted yet - polls for any state that's not in the next few weeks are pretty unreliable, and any polls before the February will usually just go on who people have heard of most. Also I didn't think Idaho was that Hispanic, it's north of the usual belt of highly Hispanic states, though I may be wrong. Also Hispanics skew Democrat - even in more Hispanic states, the GOP primary voters will be on average whiter than the state as a whole by some margin. This is why the GOP love Marco Rubio - if they don't start appealing to Hispanic voters more they'll basically end up screwed by demographics as the of white voters falls, so having high profile Hispanic candidates is vital to them.
Trump has broken certain taboos in the GOP which I think some of the base likes. So he's attacked George W Bush over Iraq, for example, which the Republicans just never do generally. He's also taken some GOP ideas on things like immigration to their logical conclusions, which then exposes how much of what the establishment candidates shout is just rhetoric - when confronted by the obvious policy implications of what they say ("let's just build a wall and make Mexico pay") they suddenly backtrack and it turns out the rhetoric is empty. Whether that makes them bad Republicans, or more sane than they look, or both, I leave up to your judgement and that of the GOP's voter base!
And yes, I'm proud of you
EDIT: apparently Idaho is only 11% Hispanic - the only highly hispanic states are New Mex, Texas, Arizona, Cali, and to a lesser extent Colorado, Nevada, and Florida.