Great question, dunno. Find out... post!
I do know that most CU’s are FDIC insured but that won’t matter if there is a collapse. Still, the way they talked my money was more protected through them than through a large public bank. I have a VISA debit card through them, and their advice was to deposit half my money there and half at the local bank. They asked me who my local bank was and said they haven’t heard of that bank being in danger. In other words, don’t put everything you have in a bank. Split it between a bank and a CU.