There is different levels of banking. Some have federal oversight and some have state oversight. Credit Union are different than banks, and even then they have different levels of oversight.
I opened a checking and savings at "state" bank with the idea of moving SS to it because it was closer to home. I never did but I made regular deposits to the saving account. I didn't pay any attention to checking statements I didn't write any checks. Two months later I found MY checking account was being used by a stranger to deposit and write checks. ??? I called the main bank and talked to the CFO who did absolutely nothing. When I closed the account the teller what SHE should do with the money in it? WTF? I'd been telling her for 30min it wasn't mine. I couldn't get out fast enough.
I had money in a credit union for years. When I found a $10K "gift" I immediately called. It was removed while we talked. There was a one digit difference in the account numbers. -- Mac: No windows, No Gates, Apple inside