I agree with both Twin Prism and Cleosmom.
Besides their comments, I think a key factor that doesn't always show up on the graphs, is how many families in the area adopt children from different countries.
While AA's are listed around 1%, that is about 1,000 people for Bonneville County (don't just look at Idaho Falls, include Ammon too). County population is over 105,000. Most likely there are some who would have similar situations and perspectives to yours and your husband.
Mom2onecutie, first I like your user name!

More importantly, the best suggestion I can give you is go visit Idaho Falls and see how it feels for you. Get in touch ahead of time with organizations/churches etc. where you presently live and see if they can give you names of contact people in Bonneville County.
I think most residents are more interested of whether you would be a good neighbor or not vs. the race or color of a child or adult's skin. Kids can be cruel - that happens in all 50 states. Unfortunately, ignorant people also live in all 50 states. I wouldn't make any decision based on one experience. I'd try to get the feel for the general area.
I'm a strong believer either an area feels right or not to those who move. I suspect you'll know when you visit.
BTW - if you search the threads, there was a very similar question asked last year. You may find some tips from that thread.
Good luck in finding what is right for you and your family!

Keep us updated, it is always nice to hear what those visiting think/observe.
MSR