Mortgage delinquency rates drifted higher in the second quarter but remained at historically low levels, according to several indicators of loan performance. The Inside Mortgage Finance Large Servicer Delinquency Index rose from 3.21 percent in the first quarter of 2004 to 3.48 percent in the second quarter. The survey tracks delinquency rates on top mortgage servicers handling over $4.22 trillion in home loans as of…