Ada County, Idaho, a core county of the Boise City-Mountain Home-Ontario, ID-OR market, holds $16.0B in deposits across 23 insured institutions and 107 branches. U.S. Bank is the largest deposit holder at 21.5% share. The top three banks hold 50% of deposits, which places the county in the Moderate band. Deposits have grown 10.2% since 2021 while the branch count fell by 7.0%. It produced $35.7B of real gross domestic product in 2024, 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: 115 in 2021 to 107 in 2026. Institutions: 22 to 23. Top-three share: 58% to 50%.
Institutions by deposits
| Institution | Deposits | Share | 5‑yr deposits |
|---|---|---|---|
| U.S. Bank | $3.4B | 21.5% | +8% |
| Wells Fargo Bank | $3.2B | 20.2% | -9% |
| JPMorgan Chase Bank | $1.3B | 8.0% | +20% |
| Zions Bancorporation | $1.1B | 6.7% | +177% |
| Washington Trust Bank | $972M | 6.1% | +61% |
| KeyBank | $968M | 6.1% | -45% |
| Idaho First Bank | $910M | 5.7% | +411% |
| First Interstate Bank | $803M | 5.0% | -4% |
| D. L. Evans Bank | $651M | 4.1% | +10% |
| Glacier Bank | $494M | 3.1% | -4% |
| WaFd Bank | $482M | 3.0% | -6% |
| Northwest Bank | $313M | 2.0% | -28% |
| Banner Bank | $307M | 1.9% | +14% |
| Sunwest Bank | $209M | 1.3% | +51% |
| Idaho Trust Bank | $208M | 1.3% | +31% |
| BMO Bank | $184M | 1.2% | -1% |
| First Federal Savings Bank of Twin Falls | $180M | 1.1% | +120% |
| Bank of America | $160M | 1.0% | no 2021 presence |
| Columbia Bank | $101M | 0.6% | +37% |
| Heritage Bank | $25M | 0.2% | no 2021 presence |
| NBH Bank | $9M | 0.1% | no 2021 presence |
| Bell Bank | $0M | 0.0% | no 2021 presence |
| Davidson Trust Co. | $0M | 0.0% | no 2021 presence |
The 23 insured institutions with a branch presence in this county, per the FDIC Summary of Deposits, June 30, 2026. Five-year change compares the same institution’s county deposits in 2021 and 2026. 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 2021 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 77.3% of its deposits.
| Measure | Ada County | Share of parent market |
|---|---|---|
| 2024 GDP | $35.7B | 72.1% |
| Deposits | $16.0B | 77.3% |
| 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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