Any member, officer or employee of the association who is interested either directly or indirectly, or who is an officer or employee of, or has an ownership interest in any firm or agency interested directly or indirectly in any contract with the association, including any loan to any housing sponsor, shall disclose this interest to the association. This interest shall be set forth in the minutes of the association, and the member, officer or employee having the interest shall not participate on behalf of the association in the authorization of any such contract.