Banks have retained a significant volume of newly originated jumbo mortgages and even certain conforming loans in recent years, but analysts at Deutsche Bank Securities stress that the “conventional wisdom” regarding bank demand for MBS is wrong. “Despite anecdotal evidence of banks retaining more whole loans – they are more and more reliant on MBS as a percentage of their overall exposure to residential mortgages than they have been at any point in the past 15 years,” the analysts said in a report released last week. Bank demand for MBS holdings has increased...