The largest seven Canadian banks face elevated risks amid signals of growing consumer debt vulnerability, warns Moody's Investors Service in a new report. "A prolonged period of sustained low interest rates has kept Canadian borrowers' debt-servicing requirements manageable and low unemployment has helped keep consumer loan defaults very low but, high and rising household debt-to-income levels leaves borrowers and lenders vulnerable to an economic downturn," the credit rating agency says in a news release. And Moody's foresees growing risks in a number of asset classes.