Washington state is suing the nation's largest student loan company, joining the federal government and the state of Illinois in alleging unfair and deceptive practices with lending and debt collection. Attorney General Bob Ferguson says Navient Corp., which was spun off from lending giant Sallie Mae, made subprime, predatory loans to students who were attending for-profit colleges with low graduation rates and scant prospects of ever being able to pay them back. The company is also accused of