With the popularity of hybrid adjustable rate mortgages hitting the market full force, it’s no surprise that a new type of borrower has emerged: one that is more willing to take on another ARM when refinancing, said an industry analyst. Linda Lowell, managing director at RBS Greenwich Capital, said the traditional relationships between fixed rate refinances and ARM refis have been shattered, making ARMs the new mainstream refi vehicle. In fact, more fixed rate borrowers…