The average net interest margin for the top 25 bank holding companies hit its lowest point since March 1992 despite strong profits, a survey of third-quarter results compiled by the American Banker shows.

Based on data supplied by SNL Securities, Charlottesville, Va., the survey found the nation's largest banks as a group had an average net interest margin of 4.16% at the end of the third quarter, compared to 4.25% at the same time last year.

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