I downvoted this because it feels like trolling. It is complicated though, because if it is trolling it is so obvious that I find a degree of amusement in it.
Here is my answer to this question for this venue, an anarchist Q&A website:
There are are some valid reasons to "bank" at a credit union versus a for profit bank. It sounds like you already know that. If finding a credit union as a personal level of consumer activism feels right for you, fucking do it, but don't fool yourself in to thinking that this is revolutionary in any way.
I don't know about Denver, but most credit unions are about as "commie friendly" as any other credit union - not. Credit unions have some roots in the idea of collective organizing, but at this point they are basically banks without shareholders (or rather with as many shareholders as they have members).