How does getting laid off worsen the economy?

Like many people in LAUSD are getting laid off, teachers, counselors, librarians and so on. Lets say they get off, they don't have a job so they can't pay their mortgage, or pay the loans to the bank, therefore lose their house...So many people won't be able to repay their bank loans then the banks could possibly go bankrupt? Whats the process of a bank going bankrupt simplified? Basically, what are negative effects of the LAUSD layoffs on the economy?