| Relationships | Role | Relationship Start | Relationship End |
| Northwestern Bank | Parent | 12/31/1982 | 4/30/1984 |
| The Security National Bank Of Sioux City, Iowa | Parent | 12/31/1976 | 4/30/1984 |
| Northwestern Bank | Parent | 12/31/1977 | 12/30/1978 |
| Security National Corporation | Parent | 10/30/1973 | 12/30/1976 |