Don't waste money and time with guns, social engineering, and fancy disguises. Instead, write a keylogger program that sends it's data to a cracked website on the Internet and some other trojans, and then put them on a USB drive disguised as a game with a bunch of other files (pictures, music, etc.). Do this for several USB drives, and then plant them around outside the bank.
I'm sure you'll get more than enough information to crack into their network and wire yourself a generous amount of money to an untraceable, overseas bank account.
