First Security Bank
Watched the ep 'Brenda the Bank Girl' from March, 1978 in Season 4 (one of the weakest eps in the whole five seasons), which was totally focused on Julie Kavner (and I think this is when the network was getting ideas to spin her off).
Some trivia...
Brenda works for First Security Bank in NY.
She is one of 600 female tellers in the company.
She works at the 'Midtown' location.
The 'location' shots for the bank show a NY street, with a close-up of the word 'Bank' stenciled on the window - no telling which bank they actually used for the street scene.
"I prefer fantasy over reality TV - like Fox News" - B.Streisand