Net interest margin expanded and the integration of National City Corp. continued smoothly, but PNC Financial Services Group Inc. did not get the same pop from fourth-quarter credit trends that other banks enjoyed.

Nonperforming assets, which declined from the third quarter to the fourth at banks including KeyCorp and Comerica, jumped nearly 12% at PNC. Net chargeoffs, at 2.1% of average loans, came in above analysts' projections.

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