Top mortgage sellers to Fannie Mae and Freddie Mac appear to be focusing even more on lower-risk mortgages, according to a new Inside Mortgage Trends analysis of loan-level mortgage-backed securities data. Some 62.9 percent of loans delivered in the third quarter had credit scores of 740 or above, up from 61.9 percent in the second quarter and 60.5 percent in the first three months of the year. The data exclude mortgages with loan-to-value ratios exceeding ... [Includes one data chart]