Fitch Ratings announced that it cut its issuer default rating for Comerica Inc. one notch, to A, saying it may be difficult for the regional banking company to be profitable this year because of higher credit costs and a depressed net interest margin.

Comerica's net interest margin, the difference between what banking companies pay in interest and receive from loans, fell to 2.53% in the first quarter from 3.22% a year earlier as interest rates continued to fall.

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