The CFPB issued a proposed rule that would extend its supervisory authority to large nonbank student loan servicers, which it would define as those handling more than 1 million borrower accounts. With that threshold, the bureau estimates that it would have authority to supervise the seven largest student loan servicers. “Combined, those seven service the loans of 49 million borrower accounts, representing most of the activity in the student loan servicing market,” the CFPB said. The bureau currently oversees student loan servicing at...