| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | American Bank, National Association | Bank | 2 | $445.0M | 30.45% |
| 2 | Primebank | Bank | 1 | $384.3M | 26.30% |
| 3 | Iowa State Bank | Bank | 5 | $184.5M | 12.63% |
| 4 | Northwest Bank | Bank | 1 | $104.5M | 7.15% |
| 5 | Midstates Bank, National Association | Bank | 2 | $98.3M | 6.73% |
| 6 | United Bank of Iowa | Bank | 1 | $83.3M | 5.70% |
| 7 | Peoples Bank | Bank | 2 | $79.7M | 5.46% |
| 8 | The Security National Bank of Sioux City, Iowa | Bank | 1 | $45.4M | 3.11% |
| 9 | Cent Credit Union | Credit union | 1 | $36.2M* | 2.47% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $1.46B | 9 | 16 | American Bank, National Association | 30.4% | 1,953 |
| 2025 | $1.44B | 9 | 16 | American Bank, National Association | 30.1% | 1,942 |
| 2024 | $1.42B | 9 | 16 | American Bank, National Association | 30.5% | 1,915 |
| 2023 | $1.40B | 9 | 16 | American Bank, National Association | 30.0% | 1,897 |
| 2022 | $1.24B | 8 | 15 | American Bank, National Association | 27.1% | 1,876 |
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.