Americans are taking out the largest mortgages on record

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The 20% down payment is a relic: the median down payment in 2016 was 10%. For first-time buyers, it was 6%. First-timers and other buyers of less-expensive homes are more leveraged now than they were at the height of the housing bubble a decade ago.

Home loan sizes aren't the only things that have changed in the years since MBA started its survey. Back at the start of the survey, the median mortgage size was only about 3.3 times the median annual income. It's now over five times as big - though buyers get bigger homes and lower interest rates.