I'd like to make a withdraw

The next time you go to the bank, just tell them to give you all of the money. Don't make threats, don't say you have a weapon, don't even raise your voice. Hell, you don't even need to pass them a note telling them they're being robbed.

When the teller says "can I help you?" Just tell him or her that you want everything in the drawer and they will hand it over without question.

No, really.

After obtaining an undisclosed amount of cash, the suspect fled on foot in an unknown direction. There was no weapon seen or implied. No one was injured during the incident.

I've posted about this phenomenon before. Apparently society is so timid that "just give them what they want" includes people with no weapon and who make no threatening gestures.