First Bank of St. Louis

First Bank of St. Louis is a privately held, family-owned commercial bank serving consumers and businesses across Missouri, Illinois, and California. With approximately $6.6 billion in assets and around 76 locations, the bank has established itself as one of the largest family-owned banks in the United States. Operating under the brand "First Bank," the institution maintains four generations of independent, single-family ownership by the Dierberg family, positioning itself as a relationship-focused community bank with expertise in serving family-owned and privately held businesses.