Depending on the type of bank will determine the easiest way it can be 
robbed. The type with
the three guards and one room is by far the easiest, and should be robbed as 
often as possible.
Use the following trick to rob it without being chased or even getting past 
two shields. First, bribe
the cop outside. Then, go into the bank and choke the first guard by the 
door. Next, go into the
vault area and start strangling the guard on the left. The other guard will 
come and attack you,
but he will not shoot. He will only hit you with his billy club. Remember to 
strangle the man on the
left first because he tends to start shooting with his shotgun if you attack 
the other guard. If you are
robbing the big bank, start the same way by bribing the cop outside. Then, 
go in and immediately
strangle the guards in the main room. Hurry down to the vault and strangle 
the two guards there.
Open the door and blow the vault. Three or four guards will attack you as 
you flee the vault. Get
close to them and shoot them with your Tommy gun to perform an instant 
execution. After you
shoot them, run up the stairs and move to the right. Then, take an immediate 
right to leave the
building where the car is always parked. Get in the car quickly because you 
will be shot at when
outside. Take off and you should not be chased once you hit the streets. 
After any bank robbery
you must go to your hangout to get the money. The best bank to rob is the 
midtown bank, close
to the apartment that the Corleone's give you after you save Michael. You 
wll get $50,000 there.