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 banks hold 51% of deposits, which places the county in the Moderate band. Deposits have grown 19.6% since 2020 while the branch count fell by 9.2%. It produces $35.7B of output, ranking #131 of the 1,523 ranked counties by economic output.
Ranks show where the county stands among the 1,523 ranked counties (those within a Combined or Metropolitan Statistical Area that have a branch). They describe relative position, not a rating of market quality or suitability.
Deposit trend
Branches: 119 in 2020 to 108 in 2025. Institutions: 21 to 23. Top-three share: 59% to 51%.
Institutions by deposits
| Institution | Deposits | Share | 5‑yr deposits |
|---|---|---|---|
| U.S. Bank | $3.4B | 23.4% | +33% |
| Wells Fargo Bank | $2.9B | 19.9% | -7% |
| JPMorgan Chase Bank | $1.1B | 7.7% | +34% |
| KeyBank | $920M | 6.2% | -41% |
| Zions Bancorporation | $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% |
| Washington Federal Bank | $488M | 3.3% | +8% |
| Northwest Bank | $367M | 2.5% | -26% |
| Banner Bank | $263M | 1.8% | +32% |
| Sunwest Bank | $206M | 1.4% | +79% |
| Idaho Trust Bank | $187M | 1.3% | +37% |
| First Federal Savings Bank of Twin Falls | $149M | 1.0% | +671% |
| Bank of America | $116M | 0.8% | no 2020 presence |
| Umpqua Bank | $91M | 0.6% | +60% |
| BMO Bank | $80M | 0.5% | -45% |
| Heritage Bank | $20M | 0.1% | no 2020 presence |
| NBH Bank | $13M | 0.1% | no 2020 presence |
| Bell Bank | $0M | 0.0% | no 2020 presence |
| Davidson Trust Co. | $0M | 0.0% | no 2020 presence |
The 23 insured institutions with a branch presence in this county, per the FDIC Summary of Deposits, 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. “No 2020 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year. Deposit figures are nominal and are not adjusted for inflation.
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 parent 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.
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