Cilla, I found your teller experiences interesting. Although I chat with lots of people I don't really know, I don't think it would have ever occurred to me to try to discuss anything at any length with a bank teller. Aren't there other customers waiting?
When I lived in Alexandria, VA I banked at Burke & Herbert Bank in Old Town. (DR Kevin will probably know it.) Oldest bank in Virginia, founded in 1852. Had never been bought out, still privately owned. The president used to have a parrot who sat on his shoulder--yes, in his office. I'd always run into people I knew there. Plus, one of the VPs was a very friendly guy and we'd always say hello. I admit it was fun going to that bank.