Does anybody know what happens to loans/mortgages when a bank fails?

By now we all probably heard about IndyMac closing its doors. With more banks struggling questions arise among the average consumers. If you have deposits in the bank you get them out until a certain level, I think it's $100k, then it's just a percentage, since the deposits are FDIC insured. But what happens to the mortgages/loans? It's doubtful the debtors are off the hook, although that would be nice, lol. So, who takes over those? Whom would the debtors have to make their payments to? Does anybody know?