| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | GreenState Credit Union | Credit union | 1 | $256.2M* | 29.20% |
| 2 | Grinnell State Bank | Bank | 1 | $139.3M | 15.87% |
| 3 | First State Bank | Bank | 3 | $138.2M | 15.74% |
| 4 | Lincoln Savings Bank | Bank | 1 | $83.1M | 9.47% |
| 5 | Wells Fargo Bank, National Association | Bank | 1 | $69.2M | 7.88% |
| 6 | Fidelity Bank & Trust | Bank | 2 | $60.3M | 6.87% |
| 7 | Montezuma State Bank | Bank | 1 | $46.2M | 5.26% |
| 8 | First Interstate Bank | Bank | 1 | $44.3M | 5.05% |
| 9 | Community 1St Credit Union | Credit union | 1 | $40.9M* | 4.66% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $877.6M | 9 | 12 | GreenState Credit Union | 29.2% | 1,626 |
| 2025 | $860.8M | 9 | 12 | GreenState Credit Union | 29.1% | 1,621 |
| 2024 | $864.1M | 10 | 12 | GreenState Credit Union | 29.6% | 1,551 |
| 2023 | $895.0M | 10 | 12 | GreenState Credit Union | 27.8% | 1,509 |
| 2022 | $910.2M | 10 | 12 | GreenState Credit Union | 30.9% | 1,625 |
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.