in other words, yes, it is created "out of nothing" (when handing out the loans) and once the "unexpected bad things" happen it becomes "real" (as in it is on the books and will now have to be accounted for properly)?
Banks infrequently get "hung" with loans and these usually are just bad deals that somehow got through. There are more hung loans now on deals that might have been okay under normal economic circumstances but are not feasible right now.