Every country have their own trick and step, like at my country I'm use vip.bitcoin.co.id
on that market exchange I can sell coin with IDR (Indonesian currency)
after we Get IDR, I sent IDR from market exchange to my ATM card,
So that meaning, they get their money from bank, but not directly.
I think you should looking for recommended site to do it, which the best site at your country. and don't follow some people look suspicious. maybbe that can be fake site.
![Kiss](https://bitcointalk.org/Smileys/default/kiss.gif)
and I hope thia little knowledge han give you an imagine how it work.