Although agency mortgage securitization gobbles up a huge share of new home loan originations, jumbo mortgages, home-equity loans and nontraditional mortgage sectors are largely held in retained portfolios that have to be carefully managed, experts say. “Your loan portfolio is incredibly important,” said Jerry Hubbard, president of FTN Financial Capital Assets Corporation during a panel at this week’s Mortgage Bankers Association Secondary Market Conference. “Your consolidated portfolio is three to four times bigger than an investment portfolio. It’s the most important asset on the books...