First Union Corp. said it earned $140 million, or $1.06 a share, in the third quarter, more than double the $68 million earned in the year-ago quarter.

Charlotte-based First Union attributed its strong showing to a robust net interest margin and continuing favorable asset quality trends. The margin reached 5.18% in the third quarter, up 30 basis points from the second quarter and 89 basis points higher than the year-ago quarter.

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