| Relationships | Role | Relationship Start | Relationship End |
| Columbia Bancshares, Inc. | Parent | 8/9/1982 | 7/28/1988 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Prosperity Bank | Buyer | 21,390,286 | Failure | 7/29/1988 |
| Relationships | Role | Relationship Start | Relationship End |
| Columbia Bancshares, Inc. | Parent | 8/9/1982 | 7/28/1988 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Prosperity Bank | Buyer | 21,390,286 | Failure | 7/29/1988 |