| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | Madison Valley Bank | Bank | 1 | $147.4M | 39.80% |
| 2 | Opportunity Bank of Montana | Bank | 2 | $110.7M | 29.90% |
| 3 | First Interstate Bank | Bank | 1 | $46.1M | 12.46% |
| 4 | Southwest Montana Community Federal Credit Union | Credit union | 1 | $36.5M* | 9.87% |
| 5 | Sky Federal Credit Union | Credit union | 1 | $29.5M* | 7.97% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $370.2M | 5 | 6 | Madison Valley Bank | 39.8% | 2,794 |
| 2025 | $362.4M | 5 | 6 | Madison Valley Bank | 38.7% | 2,679 |
| 2024 | $325.2M | 5 | 6 | Madison Valley Bank | 40.1% | 2,972 |
| 2023 | $287.8M | 4 | 5 | Madison Valley Bank | 44.5% | 3,726 |
| 2022 | $298.9M | 4 | 5 | Madison Valley Bank | 48.7% | 3,911 |
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.