TD Bank Financial Group is the seventh largest bank in North America by branches and serves approximately 17 million customers in four key businesses operating in a number of locations in key financial centres around the globe : Canadian Personal and Commercial Banking , including TD Canada Trust ; Wealth Management , including TD Waterhouse and an investment in TD Ameritrade ; U.S. Personal and Commercial Banking through TD Banknorth and Commerce Bank ( to be known together as TD Bank ) ; and Wholesale Banking , including TD Securities .