Actually, I thought I did just fine on the 3-manager interview. I've had a lot of interviews in my long career (I'm 48 now), and can usually tell within the first 2 minutes whether I'm likely to get a job offer... or not. This interview indicated to me I would, in fact, receive an offer.
Here's where I think this bank really failed: I asked my interviewers specifically when I could expect to hear about the position... either way. They assured me that ALL applicants interviewed would be notified by that Friday. (Not.)
They also failed in a large way by NOT hiring ANY of the applicants they interviewed for this position. They re-posted the same job at the same branch (same hours and pay) a month later.
What, did they really think the applicant pool had changed so much in a month? I think that's really why they wasted their time and money: Not because they didn't hire ME, but because they didn't hire anyone they interviewed!
That simple fact would cause me to close my account, had I ever had an account at that bank.
Oh, I forgot to mention in my earlier post, I asked all 3 interviewers for their business cards at the end of the interview. Only one of them had a card, and gave it to me.
I sent a hand-written thank-you note (US mail) to all 3 of them, since I was able to find out on the internet who they were, with their respective bank-branch addresses.
One thing I did NOT mention: The manager of the bank where I would have actually worked was NOT present at the interview. She had some kind of, I dunno, snafu that day, and could not attend.
Another thing: I had declared bankruptcy 9.9 years before this interview. I had the interview in February of this year, and the bankruptcy was removed from my credit report in March of this year. Bankruptcy for tellers might be against bank policy, I don't know.
Whether the "missing manager" or my credit report had any bearing on my status, of course I don't know.
Anyhow, let me say again how much I appreciate your feedback here! If only others would act on your advice...