| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First Interstate Bank | Bank | 13 | $1.98B | 21.14% |
| 2 | U.S. Bank National Association | Bank | 4 | $1.47B | 15.64% |
| 3 | Stockman Bank of Montana | Bank | 6 | $1.27B | 13.56% |
| 4 | Glacier Bank | Bank | 7 | $895.4M | 9.54% |
| 5 | Wells Fargo Bank, National Association | Bank | 4 | $894.6M | 9.54% |
| 6 | The Yellowstone Bank | Bank | 7 | $879.1M | 9.37% |
| 7 | Altana Federal Credit Union | Credit union | 7 | $375.5M* | 4.00% |
| 8 | Valley Financial Credit Union | Credit union | 8 | $354.0M* | 3.77% |
| 9 | Black Hills Federal Credit Union | Credit union | 2 | $202.9M* | 2.16% |
| 10 | Mountain America Federal Credit Union | Credit union | 1 | $188.0M* | 2.00% |
| 11 more institutions, year-over-year share and branch changes with Pro →$29/mo, cancel any time. | |||||
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $9.38B | 21 | 82 | First Interstate Bank | 21.1% | 1,195 |
| 2025 | $9.26B | 21 | 80 | First Interstate Bank | 23.1% | 1,252 |
| 2024 | $8.71B | 22 | 83 | First Interstate Bank | 21.0% | 1,216 |
| 2023 | $8.59B | 21 | 79 | First Interstate Bank | 21.0% | 1,190 |
| 2022 | $9.15B | 19 | 76 | First Interstate Bank | 20.7% | 1,208 |
Every institution above links to its profile — ratios, peer medians and this quarter’s change signals. Pro adds the full table, share movement and CSV export.