The top purchasers of mortgage securities among the Federal Home Loan Banks may have to ease off their purchases in the coming months, as regulatory caps could prevent further growth. According to data obtained by Inside The GSEs, the 12 FHLBanks held a total of $107.2 billion at the end of the second quarter – good for a 9 percent increase over the $97.9 billion the FHLBank System held at the beginning of the