JPMorgan Chase issued a $303.75 million jumbo mortgage-backed security last week backed by 15-year fixed-rate mortgages. The deal suggests that there is some viability in securitization as the loans included in the deal were suitable to be held in bank portfolios and in fact were mostly originated by banks. First Republic Bank accounted for 55.1 percent of the contributions to J.P. Morgan Mortgage Trust 2014-2 followed by Chase itself with a ...