First Bank holds $5.9B in deposits across 19 counties in 6 ranked markets and 3 states. Its deposit footprint is highly concentrated: the top three counties (St. Louis County, Los Angeles County, Orange County) hold 65% of its deposits, and California accounts for 54% of the total.
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Data as of June 30, 2025 (FDIC Summary of Deposits)
| County | Deposits | County’s % of Bank’s Deposits | Bank’s % of County Deposits | Branches | |
|---|---|---|---|---|---|
| 1. | St. Louis County, MO | $2.2B | 37.2% | 4.8% | 17 |
| 2. | Los Angeles County, CA | $859M | 14.6% | 0.2% | 15 |
| 3. | Orange County, CA | $802M | 13.6% | 0.5% | 8 |
| 4. | St. Charles County, MO | $280M | 4.8% | 2.8% | 6 |
| 5. | Santa Barbara County, CA | $197M | 3.3% | 1.4% | 3 |
| 6. | St. Clair County, IL | $189M | 3.2% | 3.2% | 3 |
| 7. | San Diego County, CA | $180M | 3.1% | 0.1% | 3 |
| 8. | San Francisco County, CA | $173M | 2.9% | 0.1% | 2 |
| 9. | Placer County, CA | $154M | 2.6% | 1.1% | 2 |
| 10. | San Bernardino County, CA | $151M | 2.6% | 0.4% | 1 |
| 11. | Contra Costa County, CA | $142M | 2.4% | 0.3% | 2 |
| 12. | Riverside County, CA | $136M | 2.3% | 0.3% | 3 |
| 13. | Ventura County, CA | $126M | 2.1% | 0.5% | 2 |
| 14. | Solano County, CA | $115M | 1.9% | 1.7% | 1 |
| 15. | Santa Clara County, CA | $59M | 1.0% | 0.0% | 1 |
| 16. | San Mateo County, CA | $49M | 0.8% | 0.1% | 1 |
| 17. | Jefferson County, MO | $38M | 0.6% | 1.0% | 1 |
| 18. | St. Louis (City) County, MO | $28M | 0.5% | 0.1% | 3 |
| 19. | Sacramento County, CA | $27M | 0.5% | 0.0% | 1 |
Deposits are as reported to the FDIC at branch level, June 30, 2025, and are nominal. “County’s % of Bank’s Deposits” is this county’s share of the institution’s total deposits; “Bank’s % of County Deposits” is this institution’s deposits as a percent of all deposits booked in that county. Counties within a Combined or Metropolitan Statistical Area link to their full profile; other counties are shown for completeness.
All 293 markets and the 1,533 counties within a CSA or MSA are covered in the Market Intelligence resource. See the methodology for how each figure is built and when to expect updates.