| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | The Yellowstone Bank | Bank | 2 | $187.3M | 54.37% |
| 2 | First Interstate Bank | Bank | 2 | $70.1M | 20.36% |
| 3 | Altana Federal Credit Union | Credit union | 1 | $48.4M* | 14.04% |
| 4 | Valley Financial Credit Union | Credit union | 1 | $38.7M* | 11.22% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2025 | $344.5M | 4 | 6 | The Yellowstone Bank | 54.4% | 3,694 |
| 2024 | $325.0M | 4 | 6 | The Yellowstone Bank | 54.7% | 3,745 |
| 2023 | $324.4M | 4 | 6 | The Yellowstone Bank | 50.2% | 3,379 |
| 2022 | $372.8M | 4 | 6 | The Yellowstone Bank | 45.7% | 3,104 |
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.