Banks and thrifts increased their first-lien holdings by 4.1 percent in 2017, according to a new ranking and analysis by Inside Nonconforming Markets. Big banks continue to retain jumbo mortgages in portfolio along with some loans eligible for sale to the government-sponsored enterprises. A total of $2.01 trillion in first-lien mortgages were held by banks and thrifts as of the end of 2017, up 1.2 percent from the end of September. Adjustable-rate mortgages ... [Includes one data chart]