Nearly all of the top commercial banks involved in servicing mortgages for other investors booked declines in the fair market value of their mortgage servicing rights, according to an analysis of call report data by Inside Mortgage Profitability. The top 40 banks in the MSR business placed a combined $25.36 billion fair market value on the MSR assets on their books. That was equal to 1.22 percent of the $2.077 trillion in mortgage loans serviced…