Commercial banks and savings institutions continued to pare down their portfolios of mortgages serviced for other investors during the first quarter, according to a call-report analysis by Inside Mortgage Trends. Banks and thrifts serviced a total of $4.56 trillion of home loans for other investors, most of which was associated with mortgage-backed securities. That was down 3.2 percent from the fourth quarter and marked the eighth consecutive ... [Includes one data chart]