Wells Fargo and JPMorgan Chase reclassified more than $3 billion of second-lien mortgages as nonperforming loans in the first quarter of 2012, a move other banks have copied. Both Wells and JPMorgan said that federal guidance from late January was behind the change. Wells characterized $1.7 billion of subordinate home-equity loans as nonperforming and JPMorgan assigned $1.6 billion to that status. “We do not view this as a material shift in the performance of these loans or the reserving methodology,” Fitch Ratings wrote. “However, increased regulatory scrutiny of second liens may continue to...