What are the credibility findings of a federal district court in a civil case?

The factual determinations of the district court, including those credibility findings which depart from the magistrate's conclusions, are the product of careful consideration of the record of the magistrate's evidentiary hearing and the testimony offered during the district court's supplemental evidentiary hearing. The district court's findings are not clearly erroneous and, accordingly, will not be disturbed. Anderson v. City of Bessemer City, N.C., 470 U.S. 564, 573-74, 105 S.Ct. 1504, 1511-12, 84 L.Ed.2d 518 (1985).