Mortgage delinquency rates declined in most loan product categories and degree of late payment during the first quarter of 2005, according to the Mortgage Bankers Association. The seasonally adjusted rate of loans past due slipped from 4.38 percent in the fourth quarter of 2004 to 4.31 percent as of the end of March. While the 60- and 90-day past due categories were both down for the quarter, the share of loans 90-days or more past…