Sub prime. Below prime rate due to a higher risk based on credit rating.
You're talking about sound lending practices. Not the lending practices that caused the crash. People with A+ credit were being fed sub prime rates. Low introductory rates on a variable rate loan. They were urged to take advantage of the interest only payment for 5 years, using the 'extra' money to invest in an inflated market.
The theory was to refinance the note in 5 years with plenty of money to put down.
Again...why would a bank care about the 'risk', if they didn't own the note for more than 5 minutes? Historically, banks wouldn't loan more than 75% of appraised value.
During the boom, they were lending 125% of an inflated appraised value