I did not think to check whether the quote was genuine since I have seen it in several places and am well aware of the American reverential view of these early statesmen. Would have thought it would be practically blasphemous to misquote him.

But sure, I admit I assumed assumed he was quoted correctly.
In fact, here are 5 legitimate pages that say the quote is genuine, including two legitimate quotation pages.

Quote Details: Thomas Jefferson: I believe that banking... - The Quotations Page
Thomas Jefferson Quote/Quotation
Thomas Jefferson quotes
Famous Quotations on Banking

Could it be that the neo-cons of America have departed so far from the original vision of their "founding fathers" that they have to discredit their quotes to remain credible? Who knows! Maybe he didn't say it, or maybe it hit a bit too close to home for some people.

Either way, apparently he also said the following in his private correspondence, collected in a book called "The Letters of Thomas Jefferson".

No I do not have the book to check for myself that he really wrote this, but assuming the source is accurate, I think Jeffersons view on the dangers of bankers given a free reign, is quite clear.

With this quote I leave the controversy of what a president of another country may or may not have said two centuries ago...
“Everything predicted by the enemies of banks, in the beginning, is now coming to pass. We are to be ruined now by the deluge of bank paper. It is cruel that such revolutions in private fortunes should be at the mercy of avaricious adventurers, who, instead of employing their capital, if any they have, in manufactures, commerce, and other useful pursuits, make it an instrument to burden all the interchanges of property with their swindling profits, profits which are the price of no useful industry of theirs.”
― Thomas Jefferson, Letters of Thomas Jefferson