The outstanding volume of mortgages serviced for other investors by banks and thrifts has been falling almost constantly in the aftermath of the financial crisis, but the third quarter of 2018 saw a relatively rare increase. Banks and thrifts serviced $3.627 trillion of residential mortgages for other investors – typically mortgage-backed securities trusts – at the end of September, according to a new Inside Mortgage Trends analysis of call-report data ... [Includes one data chart]