Trustmark (TRMK) could be a solid choice for investors given the company's remarkably improving earnings outlook. While the stock has been a strong performer lately, this trend might continue since analysts are still raising their earnings estimates for the company.The upward trend in estimate revisions for this holding company for Trustmark National Bank reflects growing optimism of analysts on its earnings prospects, which should get reflected in its stock price. After all, empirical research shows a stro ...