No banks are open on Sunday. You can do activity on line and use ATMs but most of the time theyll post Monday. Its because the world trades monday thru Friday on wall street. Most country's refuse to do business on Sundays so banks here in the us dont open.
Because if it were not open, the U.S. would go bankrupt. This is why. Bank of "America".
Give them a call. 800-841-4000