Consumer loans made and obligations acquired that are secured by a motor vehicle and repayable other than in equal periodic payments during its term shall not exceed 50 percent of all consumer loans and obligations that are secured by motor vehicles or 20 percent of assets, whichever is less. This section shall not apply to a loan made to a graduate student while attending an accredited college or university and for the purpose of actively pursuing a study program leading to a postbaccalaureate degree.