How Many Regulators Already Overview Banks?

A misconception from the media that most of the public gets is that we need regulators at banks, so the latter won’t trade for their own accounts and possibly lose money.

But the giant  banks already are constantly under watch by regulators. There are full time, on site  regulators at the big banks.How many shoulders are there to be watched over by a further army of these folks who are no smarter than the ones being dutifully watched. (See the Earl J. Weinreb NewsHole® comments.)