| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First International Bank & Trust | Bank | 3 | $1.02B | 71.74% |
| 2 | Cornerstone Bank | Bank | 1 | $305.7M | 21.41% |
| 3 | BNC National Bank | Bank | 1 | $62.5M | 4.38% |
| 4 | Dakota West Credit Union | Credit union | 1 | $35.3M* | 2.48% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $1.43B | 4 | 6 | First International Bank & Trust | 71.7% | 5,630 |
| 2025 | $1.40B | 4 | 6 | First International Bank & Trust | 71.3% | 5,567 |
| 2024 | $1.24B | 4 | 6 | First International Bank & Trust | 74.8% | 5,943 |
| 2023 | $1.14B | 4 | 6 | First International Bank & Trust | 73.9% | 5,820 |
| 2022 | $1.17B | 4 | 6 | First International Bank & Trust | 74.2% | 5,849 |
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.