Some banks and thrifts have been able to originate enough new mortgages to replace runoff from their portfolios, but the industry’s retained holdings of first-lien mortgages continued to decline in the fourth quarter of 2013, according to a new ranking and analysis by Inside Nonconforming Markets. Banks and thrifts held a total of $1.74 trillion in first-lien mortgages as of the end of 2013, down only 3.0 percent compared with the end of 2012 ... [Includes one data chart]