With a turning point in mortgage interest rates and refinance activity in view in the first quarter of this year, banks and thrifts began to mark up the valuations they put on mortgage servicing rights. A new Inside Mortgage Trends analysis of bank call report data shows that the industry serviced some $5.181 trillion of home mortgages for other investors as of the end of the first quarter of 2013. That was down 3.1 percent from the end of last year. As a group, the industry estimated a ... [Includes one data chart]