| Relationships | Role | Relationship Start | Relationship End |
| Westamerica Bancorporation | Parent | 4/16/1993 | 4/12/1996 |
| Napa Valley Bancorp | Parent | 8/12/1982 | 4/15/1993 |
| Napa Valley Development | Subsidary | 12/31/1984 | 4/15/1993 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Westamerica Bank | Buyer | 5,267,501 | Pooling of Interests | Discontinued | 4/13/1996 |
| Napa Valley Development | Seller | Discontinued | 4/16/1993 |