Intervest Bancshares (IBCA) 10-Q 2011 Q3 Quarterly report

Exhibit 32.0

Certification by the Principal Executive Officer and Principal Financial Officer

Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the filing of the Quarterly Report on Form 10-Q for the quarter ended September 30, 2011 (the “Report”) by Intervest Bancshares Corporation (the “Company”), each of the undersigned, as the principal executive and principal financial officers of the Company, hereby certifies pursuant to 18 U.S.C. §. 1350, as adopted pursuant to §. 906 of the Sarbanes-Oxley Act of 2002, that, to our knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Lowell S. Dansker

Lowell S. Dansker, Chairman and Chief Executive Officer

(Principal Executive Officer)

October 31, 2011

/s/ John J. Arvonio

John J. Arvonio, Chief Financial and Accounting Officer

(Principal Financial Officer)

October 31, 2011

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signatures that appear in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.