| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | Madison Valley Bank | Bank | 1 | $140.3M | 38.71% |
| 2 | Opportunity Bank of Montana | Bank | 2 | $103.0M | 28.42% |
| 3 | Southwest Montana Community Federal Credit Union | Credit union | 1 | $46.7M* | 12.88% |
| 4 | First Interstate Bank | Bank | 1 | $43.2M | 11.92% |
| 5 | Sky Federal Credit Union | Credit union | 1 | $29.3M* | 8.08% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 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.