Traditionally, the PMIs have insured the safest of the low to moderate-income loans, leaving the more credit-challenged borrowers and riskier loans for FHA to insure. After all, they had the flexibility to adapt to the market and set their pricing. Circumstances in today’s mortgage market may have a turned that paradigm in its ear, but that’s okay—this new and bold partnership could also determine things like which entity bears which portion given a particular borrower’s risk profile in addition to other risk factors....