The Federal Home Loan Banks have kept up their stock of mortgage-backed securities as the 12 GSEs boosted their overall holding of MBS 9 percent over the last year’s level. According to data tracked by Inside The GSEs, the total amount of MBS held in the FHLBank System through the first half of 2005 reached $116.8 billion. That’s a good 9 percent jump from the second quarter of 2004, but a mere 2 percent bump from… [One data table included]