The credit box in Fannie Mae and Freddie Mac lending continued to widen – at a glacial rate – during 2017, according to a new Inside Mortgage Trends analysis of mortgage-backed securities disclosure data. The easing trend seemed to lose momentum slightly in the fourth quarter, as more government-sponsored enterprise business landed in the middle-risk categories. For the full year, 12.13 percent of GSE purchase loans were in the highest-risk ... [Includes two data charts]