Where are the bookkeepers in assassins creed brotherhood

Just so that we are on the same page, the bookkeepers are the people that hold onto your money that is gained through your income.
There are arounds 9 bankers in Rome. The easiest to find is the one just outside the assassins base, on the island because you don't have to pay to open it. If you go to your map (Select Button) you will see an icon that looks a bit like the front of the Pantheon/house. These are the bankers.