can someone name some.

Sanford and son. Fred and Lamont are applying for a loan when the bank gets held up! :D

Sanford & Son. The last season's "Carol" episode, where it's revealed that Fred unwittingly helped a friend rob a bank in the 1930s.

Small Wonder - Jamie, Vicki, and Harriet become hostages when a bank robbery is pulled (Season 3).

On Diff'rent Strokes I think in season 2 or 3 there is a two-parter in which Arnold, Willis and Drummond are held hostage in a bank.

The Monkees. The guys run into these two men who pretend to be movie directors and convince Micky, Davy, Mike and Peter that they are making a movie about robbing a bank and they are "portraying" the bank robbers. The whole episode is hilarious!