Earlier quoted context omitted.
Credit unions have similar, maybe slightly lower, standards for opening accounts. They don't want to be stuck with overdrafts either.
I know that credit unions (and banks, for that matter) in my area don't require a high credit score to open an account - I was able to open two accounts - one in a credit union, another one in a bank - while having no credit score whatsoever after arriving to the country. The bank did actually run a credit check on me, and they told be that it basically came up as "no history", which to them is the same as not passed…
Your experience with local credit unions is the same as mine. If you come in with $100 you can open an account.