| Relationships | Role | Relationship Start | Relationship End |
| Westamerica Bancorporation | Parent | 12/31/1978 | 6/30/1983 |
| Westamerica Bancorporation | Parent | 12/31/1972 | 12/30/1978 |
| Westamerica Property Company | Subsidary | 12/31/1972 | 6/30/1983 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Westamerica Bank | Buyer | 5,267,501 | Discontinued | 7/1/1983 |