| Relationships | Role | Relationship Start | Relationship End |
| First Security Corporation | Parent | 2/2/1998 | 11/4/1999 |
| Rio Grande Bancshares, Inc. | Parent | 12/31/1991 | 2/1/1998 |
| Rio Grande Bancshares, Inc. | Parent | 12/31/1990 | 12/30/1991 |
| Rio Grande Bancshares, Inc. | Parent | 12/31/1989 | 12/30/1990 |
| Rio Grande Bancshares, Inc. | Parent | 12/1/1981 | 12/30/1989 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| First Security Bank Of New Mexico, National Association | Buyer | 2,211,982 | Pooling of Interests | Discontinued | 11/5/1999 |
| First National Bank Of Chaves County | Seller | 39,720 | Pooling of Interests | Discontinued | 7/1/1998 |
| First Nb Of Hatch | Seller | Discontinued | 8/12/1968 | ||
| First Nb Of Anthony | Seller | Discontinued | 12/20/1962 |