Firstar Corp.'s $10 billion deal for Mercantile Bancorp. sets up a big test for Firstar's integration skills, analysts said Monday.

The Midwest deal, announced late Friday, comes just five months after Milwaukee-based Firstar was formed by Star Banc Corp.'s acquisition of the old Firstar.

Subscribe Now

Access to authoritative analysis and perspective and our data-driven report series.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.