| | | | | | | | | | | | | | |
| Subsidiary | State of Incorporation or Jurisdiction of Organization | | Business Name |
| First Interstate Bank | Montana | | First Interstate Bank |
| | | | |
| | | | |
| | | | |
| FI Statutory Trust I | Connecticut | | FI Statutory Trust I |
| FI Capital Trust II | Delaware | | FI Capital Trust II |
| FI Statutory Trust III | Delaware | | FI Statutory Trust III |
| FI Capital Trust IV | Delaware | | FI Capital Trust IV |
| FI Statutory Trust V | Delaware | | FI Statutory Trust V |
| FI Statutory Trust VI | Delaware | | FI Statutory Trust VI |
| Northwest Bancorporation Capital Trust I | Delaware | | Northwest Bancorporation Capital Trust I |
| Great Western Statutory Trust IV | Connecticut | | Great Western Statutory Trust IV |
| GWB Capital Trust VI | Delaware | | GWB Capital Trust VI |
| HF Financial Capital Trust III | Delaware | | HF Financial Capital Trust III |
| HF Financial Capital Trust IV | Delaware | | HF Financial Capital Trust IV |
| HF Financial Capital Trust V | Delaware | | HF Financial Capital Trust V |
| HF Financial Capital Trust VI | Delaware | | HF Financial Capital Trust VI |
| Sunstate Bancshares Trust II | Delaware | | Sunstate Bancshares Trust II |
| | | | |