**EXHIBIT 31.2**

**CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER OF SUMMIT BANCSHARES, INC.**

| I, Bob G.   Scott, certify that: |
|----------------------------------|
|                             |   |   |
| 1.                               | I have   reviewed this quarterly report on Form 10-Q of Summit Bancshares, Inc; |
|                             |   |   |
| 2.                               | Based on my   knowledge, this quarterly report does not contain any untrue statement of a   material fact or omit to state a material fact necessary to make the   statements made, in light of the circumstances under which such statements   were made, not misleading with respect to the period covered by this   quarterly report; |
|                             |   |   |
| 3.                               | Based on my   knowledge, the financial statements, and other financial information included   in this quarterly report, fairly present in all material respects the   financial condition, results of operations and cash flows of the registrant   as of, and for, the periods presented in this quarterly report; |
|                             |   |   |
| 4.                               | The registrant’s   other certifying officers and I are responsible for establishing and   maintaining disclosure controls and procedures (as defined in Exchange Act   Rules 13a-15(e) and 15d-15(a)) for the registrant and we have: |
|                             |   |   |
|                             | a) | designed   such disclosure controls and procedures, or caused such disclosure controls   and procedures to be designed under our supervision, to ensure that material   information relating to the registrant, including its consolidated   subsidiaries, is made known to us by others within those entities,   particularly during the period in which this quarterly report is being   prepared; |
|                             |   |   |
|                             | b) | evaluated   the effectiveness of the registrant’s disclosure controls and procedures and   presented in this report our conclusion about the effectiveness of the   disclosure controls and procedures, as of the end of the period covered by   this report based on such evaluation; and |
|                             |   |   |
|                             | c) | disclosed in   this quarterly report any change in the registrant’s internal control over   financial reporting that occurred during the registrant’s most recent fiscal   quarter that has materially affected, or is reasonably likely to materially   affect, the registrant’s internal control over financial reporting; and |
|                             |   |   |
| 5.                               | The   registrant’s other certifying officers and I have disclosed, based on our   most recent evaluations of internal control over financial reporting, to the   registrant’s auditors and the audit committee of registrant’s board of   directors (or persons performing the equivalent function): |
|                             |   |   |
|                             | a) | all   significant deficiencies and material weaknesses in the design or operation   of internal controls over financial reporting which are reasonably likely to   adversely affect the registrant’s ability to record, process, summarize and   report financial information; and |
|                             |   |   |
|                             | b) | any fraud,   whether or not material, that involves management or other employees who have   a significant role in the registrant’s internal controls over financial   reporting. |

 

| Date:  08-01-04 | By:    | /s/ BOB G. SCOTT                                                                              |
|----------------------|--------|-----------------------------------------------------------------------------------------------|
|                 |   |                                                                                               |
|                 |   | Bob G. Scott   Executive Vice President and   Chief Operating OfficerChief Financial Officer) |