CHICAGO--(BUSINESS WIRE)--The threat of worsening home equity delinquencies among US banks is being mitigated by improving home prices and relatively steady economic conditions, says Fitch Ratings. An expected uptick in home equity line of credit (HELOC) delinquencies, net charges-offs and debt restructuring has not materialized to date, but as more HELOCs enter their fully amortizing payment periods over the next several years, credit quality still has the potential to worsen. The threat of HE