| Relationships | Role | Relationship Start | Relationship End |
| Westamerica Bank | Parent | 3/21/2008 | |
| Westamerica Bancorporation | Parent | 6/30/2007 | 3/20/2008 |
| Westamerica Bancorporation | Parent | 4/16/1993 | 6/29/2007 |
| Napa Valley Bancorp | Parent | 3/20/1991 | 4/15/1993 |
| Weststar Mortgage Corporation | Subsidary | 6/30/2007 | |
| Weststar Mortgage Corporation | Subsidary | 6/30/1993 | 6/29/2007 |