Citigroup Trust Bank has completed a secutization deal comprised mostly by nonprime mortgages with biweekly pay schedules offered as a part of a program that the bank believes will allow its customers to build equity more quickly. But the $768.33 million deal, backed by fixed-rate, first-lien refinance mortgages, is likely to raise some eyebrows for its unique loans structures: the underlying mortgages were underwritten using a simple interest approach...