Ada County, Idaho, a core county of the Boise City-Mountain Home-Ontario, ID-OR market, holds $14.8B in deposits across 23 insured institutions and 108 branches. U.S. Bank National Association is the largest deposit holder at 23.4% share. The top three institutions hold 51.0% of deposits, which places the county in the moderately concentrated band. Deposits have grown 19.6% since 2020 while the branch count fell by 11. It produces $35.7B of output, ranking #131 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 119 in 2020 to 108 in 2025. Institutions: 21 to 23. Top-three share: 59.0% to 51.0%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| U.S. Bank National Association | $3.4B | 23.4% | +33% |
| Wells Fargo Bank, National Association | $2.9B | 19.9% | -7% |
| JPMorgan Chase Bank, National Association | $1.1B | 7.8% | +34% |
| KeyBank National Association | $920M | 6.2% | -41% |
| Zions Bancorporation, N.A. | $883M | 6.0% | +186% |
| Washington Trust Bank | $846M | 5.7% | +72% |
| First Interstate Bank | $791M | 5.4% | +4% |
| Idaho First Bank | $688M | 4.7% | +375% |
| D. L. Evans Bank | $597M | 4.0% | +27% |
| Glacier Bank | $528M | 3.6% | +42% |
The 10 insured institutions with a branch presence in this county, as of June 30, 2025. Five-year change compares the same institution’s county deposits in 2020 and 2025. Institutions are tracked by FDIC certificate number, and where an institution acquired another bank, the acquired bank’s prior deposits are folded into the baseline so the change reflects the combined, continuing franchise rather than reading as new. Even so, a large gain can reflect acquisition rather than competitive growth; “no 2020 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year.
Part of the Boise City-Mountain Home-Ontario market
Ada County is one of 8 counties that make up the Boise City-Mountain Home-Ontario, ID-OR market, a Combined Statistical Area (ranked #75 of 293 U.S. markets by economic output). It produces 72.1% of the market’s output and holds 76.9% of its deposits.
| Measure | Ada County | Share of Boise City-Mountain Home-Ontario market |
|---|---|---|
| 2024 GDP | $35.7B | 72.1% |
| Deposits | $14.8B | 76.9% |
| Population | 546,141 | 57.3% |
View the full Boise City-Mountain Home-Ontario market profile →
Recruiting in Ada County
Deposits are split among a moderate number of institutions. Who holds the deposits, and how contested the market is, shapes both the runway for growth and the competition you would be recruiting against. We recruit commercial relationship managers, banking teams, and market leaders for banks building in markets like Ada County, on a retained basis.
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