This plugin has been down for a while, I'm sure they'll make an announcement when it's getting close to being up again. There hasn't been an eta since it was first released then taken down.
@Cozmicraft it was based on a percentage of the amount in the bank that was uninsured. So if you had insurance then your money was safe from being robbed, but if you forgot to insure your money you would loose a percentage with each successful robbery.
It was hard to rob though, with the maze and the cops after you. You had to escape and not be caught or killed for a certain time after robbing it, and people could only attempt to rob it every half hour.