| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First Interstate Bank | Bank | 10 | $1.82B | 20.96% |
| 2 | U.S. Bank National Association | Bank | 4 | $1.47B | 16.86% |
| 3 | Stockman Bank of Montana | Bank | 6 | $1.27B | 14.62% |
| 4 | Glacier Bank | Bank | 7 | $895.4M | 10.29% |
| 5 | Wells Fargo Bank, National Association | Bank | 4 | $894.6M | 10.28% |
| 6 | The Yellowstone Bank | Bank | 5 | $678.2M | 7.79% |
| 7 | Valley Financial Credit Union | Credit union | 7 | $309.8M* | 3.56% |
| 8 | Altana Federal Credit Union | Credit union | 5 | $268.2M* | 3.08% |
| 9 | Black Hills Federal Credit Union | Credit union | 2 | $202.9M* | 2.33% |
| 10 | Mountain America Federal Credit Union | Credit union | 1 | $188.0M* | 2.16% |
| 10 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 | $8.70B | 20 | 71 | First Interstate Bank | 21.0% | 1,251 |
| 2025 | $8.60B | 20 | 69 | First Interstate Bank | 22.9% | 1,307 |
| 2024 | $8.08B | 21 | 72 | First Interstate Bank | 20.5% | 1,270 |
| 2023 | $7.95B | 20 | 68 | First Interstate Bank | 20.5% | 1,242 |
| 2022 | $8.38B | 18 | 65 | First Interstate Bank | 20.4% | 1,273 |
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.