The Federal Home Loan Bank System continued to show a liking for non-agency investments as its collective holding of mortgage-backed securities ticked up slightly during the third quarter. Total MBS held by the 12 GSEs hit $117.2 billion as of Sept. 30, new data from the Federal Housing Finance Board show. That represents a 9 percent gain from 3Q04, but just a meager .3 percent rise in total holdings from the second quarter. …