IMT also found that in 3Q, seven of the top 15 sellers to Fannie and Freddie were nonbanks.

Among our findings, a few things stand out, including the ascension of PennyMac to the number two position among Ginnie Mae issuers.

The GSEs securitized $100.30 billion of purchase mortgages during the third quarter, a 28.3 percent sequential gain.

Banks, thrifts and credit unions reported $540.4 billion of HELOCs on their books at the end of June, down 0.9 percent from March.

Fannie, Freddie and Ginnie All saw most of their business come from borrowers earning less than $150,000 per year.

At the top of the heap was the Federal Reserve, which boosted its agency MBS portfolio by 3.8 percent during the second quarter.

The increase in mortgage debt outstanding in the third quarter of 2013 increasingly looks like an aberration rather than a turning point.

Broker originations also had a significantly larger average loan amount, $230,082, than the other channels.

On a year-to-date basis, mortgage sales were down 63.6 percent from the first half of 2013.

The biggest chunk of purchase business for the GSEs were loans ranging from $200,000 to $300,000, which accounted for 29.4 percent of their business.