| Relationships | Role | Relationship Start | Relationship End |
| Westamerica Bank | Parent | 7/1/1983 | 2/21/1996 |
| Ukiah Main Branch | Parent | 12/31/1972 | 6/30/1983 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Westamerica Bank | Buyer | 5,267,501 | Pooling of Interests | Discontinued | 2/22/1996 |