
Americans are pretty good at adding words to the English language. We owe them pin-up girls, highbrows, killjoys, stooges, hobos, drop-outs, shills, bobby-soxers, hijackers, do-gooders and hitchhikers who thumb a ride.
The Americanisms are so much more concise and vivid. Instead of saying "sorry we're late but drivers ahead of us slowed us down when they craned their necks to look at a crash" you can say "we were held up by rubberneckers".
The word is bankster, derived by a marriage of banker and gangster.