Lists · Deposits by county
Ada County, ID Bank Deposit Market Share
U.S. Bank N.A. holds the largest share of deposits in Ada County, ID, 21.5%, followed by Wells Fargo Bank, N.A. (20.2%) and JPMorgan Chase Bank, N.A. (8.0%). 23 institutions hold $15.98B at 107 offices as of June 30, 2026, up 8.3% from 2025.
Largest share changes since 2025
Gained: Idaho First Bank (1.03 points); Zions Bancorporation, N.A. (0.77 points); BMO Bank N.A. (0.61 points).
Lost: U.S. Bank N.A. (-1.91 points); Northwest Bank (-0.53 points); Glacier Bank (-0.48 points).
| # | Institution | Deposits | Market share | Share change from 2025 |
|---|---|---|---|---|
| 1 | U.S. Bank N.A. | $3.43B | 21.45% | -1.91 pts |
| 2 | Wells Fargo Bank, N.A. | $3.23B | 20.18% | +0.29 pts |
| 3 | JPMorgan Chase Bank, N.A. | $1.27B | 7.96% | +0.21 pts |
| 4 | Zions Bancorporation, N.A. | $1.08B | 6.75% | +0.77 pts |
| 5 | Washington Trust Bank | $972.4M | 6.08% | +0.36 pts |
| 6 | KeyBank N.A. | $968.1M | 6.06% | -0.17 pts |
| 7 | Idaho First Bank | $910.0M | 5.69% | +1.03 pts |
| 8 | First Interstate Bank | $803.2M | 5.03% | -0.33 pts |
| 9 | D.L. Evans Bank | $650.6M | 4.07% | +0.03 pts |
| 10 | Glacier Bank | $494.1M | 3.09% | -0.48 pts |
| 11 | WaFd Bank | $481.6M | 3.01% | -0.29 pts |
| 12 | Northwest Bank | $313.1M | 1.96% | -0.53 pts |
| 13 | Banner Bank | $307.4M | 1.92% | +0.14 pts |
| 14 | Sunwest Bank | $209.1M | 1.31% | -0.09 pts |
| 15 | Idaho Trust Bank | $208.3M | 1.30% | +0.03 pts |
| 16 | BMO Bank N.A. | $184.4M | 1.15% | +0.61 pts |
| 17 | First Federal Savings Bank of Twin Falls | $180.0M | 1.13% | +0.12 pts |
| 18 | Bank of America, N.A. | $160.4M | 1.00% | +0.22 pts |
| 19 | Columbia Bank | $101.2M | 0.63% | +0.02 pts |
| 20 | Heritage Bank | $24.6M | 0.15% | +0.02 pts |
| 21 | NBH Bank | $9.2M | 0.06% | -0.03 pts |
| 22 | Davidson Trust Co. | $0 | <0.01% | 0.00 pts |
| 22 | Bell Bank | $0 | <0.01% | 0.00 pts |
About this list
Deposits are those held at each institution's offices in Ada County as of June 30, 2026, from the FDIC Summary of Deposits, whatever state the institution is headquartered in. Market share is the institution's deposits divided by all deposits in the market. Shares are by bank charter, not rolled up to the holding company, and cover FDIC-insured institutions only, so credit unions are not included. Each office is placed in its county and metro area by the FDIC branch directory; the few offices the directory does not list are left out of the market and of every share.
Share change compares the institution's share in 2025 and 2026 in percentage points. Deposit change compares its deposits here in the two years and includes deposits that moved through mergers and branch sales; "New" means it had no offices here a year earlier. Offices that closed during the year are placed by their ZIP code or city.
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