Housing Lenders Fear Bigger Wave of Loan Defaults

Homeowners with good credit are falling behind on their payments in growing numbers, even as the problems with mortgages made to people with weak, or subprime, credit are showing their first, tentative signs of leveling off after two years of spiraling defaults.

The percentage of mortgages in arrears in the category of loans one rung above subprime, so-called alternative-A mortgages, quadrupled to 12 percent in April from a year earlier. Delinquencies among prime loans, which account for most of the $12 trillion market, doubled to 2.7 percent in that time.

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“Subprime was the tip of the iceberg,” said Thomas H. Atteberry, president of First Pacific Advisors, a investment firm in Los Angeles that trades mortgage securities. “Prime will be far bigger in its impact.”

In a conference call with analysts last month, James Dimon, the chairman and chief executive of JPMorgan Chase, said he expected losses on prime loans at his bank to triple in the coming months and described the outlook for them as “terrible.”