Through three quarters in 2017, originations of interest-only mortgages declined significantly, according to a new ranking and analysis by Inside Nonconforming Markets. A group of 15 prominent IO lenders had $20.18 billion of such production in the first three quarters of 2017. That was down by 35.1 percent from the same span in 2016. First Republic Bank, the top IO lender in the group, increased its production of the loans, but volume has declined at ... [Includes one data chart]