In a potentially significant shift, Wells Fargo has set aside $507.0 million in mortgages for inclusion in a non-agency mortgage-backed security. Wells is the top jumbo lender and some industry analysts suggest that the jumbo MBS market won’t rebound until banks like Wells stop retaining production in portfolio. Wells said loans designated as held-for-sale for a future MBS are nonconforming mortgages that would have otherwise been stored in its portfolio. Although no other details about ...