WASHINGTON - December 22, 2009 - Troubled home loans continued to mount in the nation's banks in the third quarter as even once-solid borrowers increasingly fell behind on their mortgage payments.

For the first quarter ever, the number of homes in foreclosure with mortgages serviced by U.S. national banks and savings and loans topped the 1-million mark, according to figures released Monday by the Office of Thrift Supervision and the Office of the Comptroller of the Currency.

The percentage of prime borrowers whose loans were 60 or more days past due doubled from the July-to-September period a year earlier. And more than half of all homeowners whose payments had been lowered through modification plans defaulted again.

The report, which covers about 34 million loans, or about 65% of all U.S. mortgages, underscores the obstacles to strengthening the nation's rickety housing market. Stubborn unemployment is making it tough for millions of homeowners to pay their debts. In addition, many people whose monthly installments have been lowered still are unable to keep up with their payments.

Of the mortgages serviced by national banks and thrifts, only 87.2% were current and performing. It was the sixth straight quarter that the quality of those home loan portfolios had slipped.

"Mortgage performance continued to decline as a result of continuing adverse economic conditions including rising unemployment and loss in home values," the report said.