Single-family business at Fannie Mae and Freddie Mac fell sharply in the first quarter of 2017 and the wholesale-broker channel bore much of the brunt of the decline. The two government-sponsored enterprises issued $218.2 billion in new single-family mortgage-backed securities during the first quarter, a 27.1 percent drop from the final three months of 2016. But a new Inside Mortgage Trends analysis reveals that the supply of mortgages originated ... [Includes two data charts]