Fueled by fat trading gains at big New York banks, strong loan growth at several companies in the Southeast and the Midwest, and signs of a credit rebound in the West, banks released another round of strong second-quarter earnings Tuesday.

Citicorp, the nation's biggest company, netted $446 million in its second quarter, a 212% jump from the year-earlier period, on spectacular trading revenue of almost $575 million and improved credit quality. Chemical Banking Corp.'s profits surged 59% on similarly strong trading results to $381 million.

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