As far as I know, there is not even enough cash available - first come, first serve... As we experienced before, in case of a sudden crisis like a bank getting in troubles - the bank simply keeps closed!
Even when simple issues happen, the worries begin. One day me and a friend made an excursion. For some reason, we had extra expenses and credit cards were not accepted. All ATMs in the whole era did not work! Bad afternoon...
We should spread it that it is easy to leave our money at some bank but chances are it will not be there when needed.