Crown Bank says Peterson, who was traded by the New Orleans Saints to the Arizona Cardinals on Tuesday, took out the loan in May 2016 and defaulted five months later. The Star Tribune reports that Peterson eventually brought the balance down to $594,000 after entering into a forbearance agreement with the Minneapolis bank. The lawsuit filed Tuesday in Hennepin County Court says Peterson failed to meet the bank's demands and must pay the balance, plus interest. It does not specify the purpose of the loan.
Peterson's attorney, Scott Zolke, of Los Angeles, did not immediately return a call seeking comment on Peterson's behalf.
Peterson said Wednesday that "it's personal" when he was asked about the lawsuit.
"Not going to really get into all of that," he said.
The four-time All-Pro and seven-time Pro Bowl selection was drafted by the Vikings seventh overall in the 2007 NFL draft.
ESPN's Josh Weinfuss and The Associated Press contributed to this report.