ZIONS BANCORPORATION /UT/
S-4, 1997-11-19
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 19, 1997
                                                     REGISTRATION NO. 333-
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                                ---------------
                                   FORM S-4
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
 
                                ---------------
                             ZIONS BANCORPORATION
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 

      UTAH                       6712                      87-0227400
(STATE OR OTHER        (PRIMARY STANDARD INDUSTRIAL   (I.R.S. EMPLOYER 
 JURISDICTION OF         CLASSIFICATION CODE NUMBER)   IDENTIFICATION NUMBER)
 INCORPORATION OR
 ORGANIZATION)
 
                                ---------------
 
                          ONE SOUTH MAIN, SUITE 1380
                          SALT LAKE CITY, UTAH 84111
                                (801) 524-4787
   (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                 OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                                ---------------
 
                                DALE M. GIBBONS
                             ZIONS BANCORPORATION
                          ONE SOUTH MAIN, SUITE 1380
                          SALT LAKE CITY, UTAH 84111
                                (801) 524-4787
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                  INCLUDING AREA CODE, OF AGENT FOR SERVICE)
 
                                ---------------
 
                                WITH COPIES TO:
         STANLEY F. FARRAR                          THOMAS C. ERB
        SULLIVAN & CROMWELL                 LEWIS, RICE & FINGERSH, L.C.
      444 SOUTH FLOWER STREET                    500 NORTH BROADWAY
   LOS ANGELES, CALIFORNIA 90071           ST. LOUIS, MISSOURI 63102-2147
           (213) 955-8000                          (314) 444-7600
 
                                ---------------
 
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF THE SECURITIES TO THE
                                    PUBLIC:

     AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS REGISTRATION
                                  STATEMENT.
 
  If the securities being registered on this form are being offered in
connection with the formation of a holding company and there is compliance
with General Instruction G, check the following box. [_]
 
                                ---------------
 
                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------
                                                PROPOSED       PROPOSED
 TITLE OF EACH CLASS OF                         MAXIMUM        MAXIMUM      AMOUNT OF
    SECURITIES TO BE        AMOUNT TO BE     OFFERING PRICE   AGGREGATE    REGISTRATION
       REGISTERED            REGISTERED        PER SHARE    OFFERING PRICE  FEE(3)(4)
- ---------------------------------------------------------------------------------------
<S>                      <C>                 <C>            <C>            <C>
Common Stock, no par
 value(1)..............  4,419,995(2) shares      N/A            N/A         $43,643
                                                                              26,567
                                                                             -------
                                                                             $17,076
- ---------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------
</TABLE>
(1) Includes associated share purchase rights. Prior to the occurrence of
    certain events, such rights will not be evidenced or traded separately
    from the Zions Common Stock.
(2) Represents the estimated maximum number of shares of Common Stock, no par
    value ("Zions Common Stock"), of Zions that are issuable in exchange for
    shares of Common Stock, par value $.01 per share ("Vectra Common Stock"),
    and in exchange for shares of preferred stock, $.01 per share ("Vectra
    Preferred Stock"), of Vectra Banking Corporation ("Vectra") upon
    consummation of the merger (the "Merger") of Vectra with and into Zions
    Bancorporation ("Zions").
(3) Pursuant to Rule 457(f)(1) and 457(c), the registration fee is based on
    the average of the high and low sales prices of the Vectra Common Stock as
    reported on the NASDAQ National Market System on November 13, 1997
    ($25.50) and pursuant to Rule 457(f)(2) on the book value of the Vectra
    Preferred Stock as of the latest practicable date ($100) and computed
    based on the estimated maximum number of shares of Vectra Common Stock and
    Vectra Preferred Stock (5,221,322 and 108,754, respectively) that may be
    converted into the shares of Zions Common Stock to be registered.
(4) A registration fee of $43,643 is payable hereunder; however, a
    registration fee of $26,567 was previously paid in connection with the
    filing by Vectra of preliminary proxy solicitation materials, under
    Section 14(g) and Rule 0-11(a)(2) of the Securities Exchange Act of 1934,
    as amended, which fee, pursuant to Rule 457(b) under the Securities Act of
    1933, as amended, has been credited against the registration fee payable
    hereunder.
 
                                ---------------
 
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(a) OF THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT
BECOMES EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(a), MAY DETERMINE.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
                  [LETTERHEAD OF VECTRA BANKING CORPORATION]

 
                                                               November 21, 1997
 
To the shareholders
 of Vectra Banking Corporation:
 
  You are cordially invited to attend a Special Meeting of shareholders of
Vectra Banking Corporation ("Vectra") to be held on December 29, 1997 in the
lobby of the headquarters of Vectra, 1650 South Colorado Boulevard, Denver,
Colorado, at 8:00 a.m., local time. At the Special Meeting, you will be asked
to consider and vote on a proposal to approve the proposed merger of Vectra
with and into Zions Bancorporation ("Zions"), pursuant to an Agreement and Plan
of Merger, dated as of September 23, 1997, by and between Zions and Vectra.
Upon the merger becoming effective, each issued and outstanding share of common
stock, par value $.01 per share, of Vectra will be converted into the right to
receive 0.685 (the "Common Conversion Number") of a share of common stock, no
par value, of Zions (the "Zions Common Stock") and each issued and outstanding
share of preferred stock, par value $.01 per share, of Vectra will be converted
into the right to receive 7.755 (the "Preferred Conversion Number") shares of
Zions Common Stock. The Common Conversion Number and the Preferred Conversion
Number are subject to increase, but not decrease, upon the occurrence of
certain events described in the accompanying Proxy Statement-Prospectus. The
shares of Zions Common Stock to be issued in the Merger, together with cash in
lieu of fractional share interests, are herein referred to as the "Merger
Consideration."
 
  THE BOARD OF DIRECTORS OF VECTRA (THE "VECTRA BOARD") HAS CONCLUDED THAT THE
MERGER IS FAIR TO AND IN THE BEST INTERESTS OF VECTRA AND ITS SHAREHOLDERS AND
UNANIMOUSLY RECOMMENDS THAT THE VECTRA SHAREHOLDERS VOTE FOR THE APPROVAL OF
THE MERGER. The Wallach Company, Inc., Vectra's financial advisor, has
delivered to the Vectra Board its opinion that the Merger Consideration is fair
to the Vectra shareholders from a financial point of view.
 
  Consummation of the merger is subject to certain conditions, including the
approval of the merger by the Vectra shareholders and various regulatory
authorities and the receipt of an opinion of counsel in respect of certain
federal income tax consequences of the merger. Subject to satisfaction or
waiver of the foregoing conditions, the merger currently is expected to close
in the first quarter of 1998.
 
  The enclosed Notice of Special Meeting of Shareholders and Proxy Statement-
Prospectus describe the merger and provide specific information concerning the
Special Meeting. Please read these materials carefully and consider the
information contained in them.
 
  It is important that your shares be represented and voted at the Special
Meeting regardless of the number of shares you own and whether or not you plan
to attend the Special Meeting. The affirmative vote of the holders of a
majority of the outstanding shares of Vectra common stock entitled to vote at
the Special Meeting and the affirmative vote of the holders of a majority of
the outstanding shares of Vectra preferred stock entitled to vote at the
Special Meeting, each voting as a separate group, are required for approval of
the merger. Your failure to vote for approval of the merger has the same effect
as a vote against the merger.
 
  I urge each of you to sign, date and mail the enclosed proxy promptly in the
enclosed postage-paid envelope, whether or not you currently plan to attend the
Special Meeting. Returning your proxy card now will not prevent you from voting
in person at the Special Meeting, but will assure that your vote is counted if
you are unable to attend. If you decide to attend the Special Meeting and wish
to vote in person, you may withdraw your proxy at that time. Please do not send
in certificates for your shares of Vectra common stock or Vectra preferred
stock, as the case may be, at this time. Instructions for exchange of stock
certificates will be sent to Vectra shareholders upon consummation of the
merger.
 
                                         Sincerely,
 
                                         /s/ Gary S. Judd
                                         Gary S. Judd
                                         President and Chief Executive Officer
<PAGE>
 
                          VECTRA BANKING CORPORATION
                         1650 SOUTH COLORADO BOULEVARD
                            DENVER, COLORADO 80222
 
                                ---------------
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                        TO BE HELD ON DECEMBER 29, 1997
 
                                ---------------
 
  NOTICE IS HEREBY GIVEN that a Special Meeting of shareholders of Vectra
Banking Corporation, a Colorado corporation ("Vectra"), has been called by the
Board of Directors of Vectra and will be held in the lobby of the headquarters
of Vectra, 1650 South Colorado Boulevard, Denver, Colorado on December 29,
1997 at 8:00 a.m., local time.
 
  The purposes of the Special Meeting are:
 
    (1) to consider and vote on a proposal to approve the proposed merger
  (the "Merger") of Vectra with and into Zions Bancorporation, a Utah
  corporation ("Zions"), pursuant to an Agreement and Plan of Merger, dated
  as of September 23, 1997 (as it may be amended, supplemented or otherwise
  modified from time to time, the "Merger Agreement"), by and between Zions
  and Vectra. As a result of the Merger, Vectra would be merged with and into
  Zions with Zions being the surviving corporation; and
 
    (2) to transact such other business as may properly come before the
  Special Meeting or any adjournments or postponements thereof.
 
  Holders of record of shares of Vectra common stock and Vectra preferred
stock at the close of business on November 7, 1997, the record date for the
Special Meeting, are entitled to notice of and to vote at the Special Meeting
or at any postponements or adjournments thereof. The affirmative vote of the
holders of a majority of the outstanding shares of common stock, par value
$.01 per share, of Vectra and the affirmative vote of the holders of a
majority of the outstanding shares of preferred stock, par value $.01 per
share, of Vectra, each voting as a separate group, are required to approve the
Merger.
 
  The Board of Directors of Vectra has concluded that the Merger is fair to
and in the best interests of Vectra and its shareholders and unanimously
recommends that the Vectra shareholders vote for the approval of the Merger.
 
  The terms of the Merger and the Zions common stock to be issued in
connection therewith are described in detail in the accompanying Proxy
Statement-Prospectus. To ensure that your vote will be counted, please
complete, date and sign the enclosed proxy card and return it promptly in the
enclosed postage-paid envelope, whether or not you currently plan to attend
the Special Meeting. You may revoke your proxy in the manner described in the
accompanying Proxy Statement-Prospectus at any time before it is voted at the
Special Meeting.
 
  By complying with certain procedures specified by Colorado law, holders of
preferred stock of Vectra are entitled to exercise dissenters' rights and to
receive cash in an amount equal to the fair market value of their shares of
preferred stock of Vectra immediately before the effective date of the Merger
(excluding any appreciation or depreciation in anticipation of the Merger
except to the extent such exclusion would be inequitable) in lieu of receiving
the Zions common stock in the Merger. See "Dissenters' Rights" in the
accompanying Proxy Statement-Prospectus. The complete text of the Colorado
Business Corporation Act relating to dissenters' rights is set forth as
Appendix D to the Proxy Statement-Prospectus.
 
                                      By Order of the Board of Directors,
 
                                      /s/ Ray L. Nash

                                      Ray L. Nash
                                      Secretary
Denver, Colorado
November 21, 1997
                                ---------------
 
  YOUR VOTE IS IMPORTANT. THEREFORE, WHETHER OR NOT YOU PLAN TO ATTEND THE
SPECIAL MEETING, YOU SHOULD DATE, SIGN AND RETURN THE ENCLOSED PROXY CARD AS
PROMPTLY AS POSSIBLE. IF YOU ATTEND THE SPECIAL MEETING, YOU WILL BE ENTITLED
TO VOTE IN PERSON EVEN IF YOU PREVIOUSLY SUBMITTED A PROXY.
 
  YOU SHOULD NOT SEND IN CERTIFICATES FOR YOUR SHARES OF VECTRA COMMON STOCK
OR VECTRA PREFERRED STOCK, AS THE CASE MAY BE, AT THIS TIME.
 
                                ---------------
<PAGE>
 
                                PROXY STATEMENT
 
                           VECTRA BANKING CORPORATION
 
                SPECIAL MEETING TO BE HELD ON DECEMBER 29, 1997
 
                                ---------------
 
                                   PROSPECTUS
 
                              ZIONS BANCORPORATION
 
                                  COMMON STOCK
                            (NO PAR VALUE PER SHARE)
 
                                ---------------
 
  This Proxy Statement-Prospectus is being furnished to the holders (the
"Vectra Common Shareholders") of common stock, par value $.01 per share (the
"Vectra Common Stock"), and the holders (the "Vectra Preferred Shareholders"
and, together with the Vectra Common Shareholders, the "Vectra Shareholders")
of $100 Series A Convertible Preferred Stock, par value $.01 per share (the
"Vectra Preferred Stock" and, together with the Vectra Common Stock, the
"Vectra Stock") of Vectra Banking Corporation, a Colorado corporation
("Vectra"), in connection with the solicitation of proxies by the Board of
Directors of Vectra (the "Vectra Board") from holders of outstanding shares of
Vectra Stock, for use at a special meeting of shareholders of Vectra to be held
in the lobby of the headquarters of Vectra, 1650 South Colorado Boulevard,
Denver, Colorado, on December 29, 1997, at 8:00 a.m., local time, and at any
adjournments and postponements thereof (the "Special Meeting").
 
  At the Special Meeting, Vectra Shareholders will be asked to consider and
vote to approve the proposed merger (the "Merger") of Vectra with and into
Zions Bancorporation, a Utah corporation ("Zions"), with Zions being the
corporation surviving the Merger (sometimes hereinafter referred to as the
"Surviving Corporation"), pursuant to an Agreement and Plan of Merger, dated as
of September 23, 1997 (as it may be amended, supplemented or otherwise modified
from time to time, the "Merger Agreement"), by and between Zions and Vectra,
which is attached as Appendix A to this Proxy Statement-Prospectus and is
incorporated herein by reference.
 
  Under the Merger Agreement, (a) each share of Vectra Common Stock issued and
outstanding at the Effective Time (as defined herein) (other than shares of
Vectra Stock held by Vectra or any of its subsidiaries or by Zions or any of
its subsidiaries, in each case other than in a fiduciary (including custodial
or agency) capacity or as a result of debts previously contracted in good faith
("Treasury Stock")) will be converted automatically at the Effective Time into
the right to receive 0.685 of a share (the "Common Conversion Number") of
common stock of Zions ("Zions Common Stock"), with any rights attached thereto
under or by virtue of the Zions Rights Plan (as defined herein), and (b) each
share of Vectra Preferred Stock issued and outstanding at the Effective Time
(other than (i) Treasury Stock and (ii) shares which have not been voted in
favor of the Merger and with respect to which Dissenters' Rights (as defined
herein) shall have been perfected in accordance with the Colorado Business
Corporation Act (the "CBCA")) will be converted automatically at the Effective
Time into the right to receive 7.755 shares (the "Preferred Conversion Number")
of Zions Common Stock, with any rights attached thereto under or by virtue of
the Zions Rights Plan. Each of the Common Conversion Number and the Preferred
Conversion Number is subject to upward (but not downward) adjustment under
certain circumstances, as described herein. See "The Merger Agreement--
Termination; Conversion Number Adjustment." Based upon the representations and
warranties of Vectra in the Merger Agreement regarding the number of shares of
Vectra Stock (and options to acquire Vectra Common Stock) outstanding as of the
date thereof, assuming no Dissenters' Rights are perfected by Vectra Preferred
Shareholders and no cash is paid in lieu of fractional shares, and not
including shares held by Zions or its affiliates, 4,198,995 shares of Zions
Common Stock would be issued in the Merger. The Merger Agreement also provides
for the conversion upon consummation of the Merger of all stock options (the
"Vectra Stock Options") outstanding under the Vectra Stock Plans (as defined
herein) into options to acquire shares of Zions Common Stock, appropriately
adjusted to reflect the Common Conversion Number.
 
  This Proxy Statement-Prospectus constitutes a prospectus of Zions in respect
of up to 4,419,995 shares of Zions Common Stock to be issued upon consummation
of the Merger pursuant to the Merger Agreement.
 
  The outstanding shares of Zions Common Stock are traded on the Nasdaq
National Market ("NASDAQ"). The last reported closing price of Zions Common
Stock on NASDAQ on November 18, 1997 was $39.75 per share.
 
  This Proxy Statement-Prospectus and the accompanying proxy cards are first
being mailed to shareholders of Vectra on or about November 21, 1997.
 
                                ---------------
 
 THESE SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES AND
  EXCHANGE  COMMISSION  OR  ANY  STATE SECURITIES  COMMISSION,  NOR  HAS  THE
    SECURITIES AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES  COMMISSION
     PASSED  UPON  THE  ACCURACY  OR  ADEQUACY OF  THIS  PROXY  STATEMENT-
      PROSPECTUS.  ANY  REPRESENTATION  TO  THE CONTRARY  IS  A  CRIMINAL
        OFFENSE.
 
   THE  SHARES  OF  ZIONS  COMMON  STOCK  OFFERED  HEREBY  ARE  NOT  SAVINGS
       ACCOUNTS, DEPOSITS  OR  OTHER OBLIGATIONS  OF A  BANK  OR SAVINGS
          ASSOCIATION  AND ARE  NOT  INSURED BY  THE FEDERAL  DEPOSIT
              INSURANCE  CORPORATION  OR ANY  OTHER  GOVERNMENTAL
                  AGENCY.
 
                                ---------------
 
       THE DATE OF THIS PROXY STATEMENT-PROSPECTUS IS NOVEMBER 21, 1997.
<PAGE>
 
                             AVAILABLE INFORMATION
 
  Zions and Vectra are each subject to the informational requirements of the
Securities Exchange Act of 1934, as amended, and the rules and regulations
thereunder (the "Exchange Act"), and, in accordance therewith, files reports,
proxy statements and other information with the Securities and Exchange
Commission (the "Commission"). Such reports, proxy statements and other
information can be inspected and copied at the public reference facilities of
the Commission maintained by the Commission at Room 1024, 450 Fifth Street,
N.W., Washington, D.C. 20549 and at the Commission's regional offices at 7
World Trade Center, Suite 1300, New York, New York 10048 and Citicorp Center,
500 West Madison Street, Suite 1400, Chicago, Illinois 60661, at prescribed
rates. Copies of such materials can also be obtained at prescribed rates by
mail addressed to the Commission, Public Reference Section, 450 Fifth Street,
N.W., Washington, D.C. 20549. In addition, Zions Common Stock and Vectra
Common Stock are quoted on NASDAQ, and such reports, proxy statements and
other information can also be inspected at the offices of NASDAQ Operations,
1735 K Street, N.W., Washington, D.C. 20006. Such material may also be
accessed electronically by means of the Commission's home page on the Internet
at http://www.sec.gov.
 
  This Proxy Statement-Prospectus constitutes a part of a registration
statement on Form S-4 (together with all amendments and exhibits, the
"Registration Statement") filed by Zions with the Commission under the
Securities Act of 1933, as amended, and the rules and regulations thereunder
(the "Securities Act"), with respect to the shares of Zions Common Stock to be
issued in connection with the Merger. As permitted by the rules and
regulations of the Commission, this Proxy Statement-Prospectus omits certain
information, exhibits and undertakings contained in the Registration
Statement. The statements contained in this Proxy Statement-Prospectus as to
the contents of any contract or other document filed as an exhibit to the
Registration Statement are of necessity brief descriptions and are qualified
in their entirety by reference to the copy of such contract or document filed
as an exhibit to the Registration Statement. The Registration Statement and
the exhibits thereto can be inspected at the public reference facilities of
the Commission at Room 1024, 450 Fifth Street, N.W., Washington, D.C., and
copies of such material can be obtained at prescribed rates by mail addressed
to the Commission, Public Reference Section, Washington, D.C. 20549.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
  The following documents filed with the Commission by Zions are hereby
incorporated herein by reference and made a part hereof:
 
    (a) Zions' Annual Report on Form 10-K for the year ended December 31,
  1996, filed on March 26, 1997.
 
    (b) Zions' Quarterly Reports on Forms 10-Q for the quarters ended March
  31, 1997, June 30, 1997 and September 30, 1997, filed on May 13, 1997,
  August 12, 1997 and November 14, 1997, respectively.
 
    (c) Zions' Current Reports on Forms 8-K filed on March 11, 1997, July 9,
  1997 and October 3, 1997.
 
    (d) The description of Zions Common Stock (which is registered under
  Section 12 of the Exchange Act) which is contained in Zions' registration
  statement on Form 10, and any amendment or report filed for the purpose of
  updating such description.
 
    (e) The description of the Zions Rights Plan contained in Zions'
  Registration Statement on Form 8-A dated October 10, 1996, and any
  amendment or report filed for the purpose of updating such description.
 
  The following documents filed with the Commission by Vectra are hereby
incorporated herein by reference and made a part hereof:
 
    (a) Vectra's Annual Report on Form 10-K for the year ended December 31,
  1996, filed on March 27, 1997.
 
    (b) Vectra's Quarterly Reports on Forms 10-Q for the quarters ended March
  31, 1997, June 30, 1997 and September 30, 1997, filed on May 10, 1997,
  August 15, 1997 and November 14, 1997, respectively.
 
    (c) Vectra's Current Report on Form 8-K filed on September 29, 1997.
 
                                       2
<PAGE>
 
  All documents and reports filed by Zions or Vectra pursuant to Section
13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date hereof
and prior to the Special Meeting shall be deemed to be incorporated herein by
reference and to be a part hereof from the date of such filing and any
statement contained herein or in a document incorporated or deemed to be
incorporated herein by reference shall be deemed to be modified or superseded
for purposes hereof to the extent that a statement contained herein or in any
other subsequently filed document which also is, or is deemed to be,
incorporated herein by reference, modifies or supersedes such statement. Any
such statement so modified or superseded shall not be deemed to constitute a
part hereof, except as so modified or superseded. Such incorporation by
reference shall not be deemed specifically to incorporate by reference the
information referred to in Item 402(a)(8) of Regulation S-K.
 
                               ----------------
 
  THIS PROXY STATEMENT-PROSPECTUS INCORPORATES BY REFERENCE CERTAIN DOCUMENTS
WHICH ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH. COPIES OF SUCH DOCUMENTS
ARE AVAILABLE UPON REQUEST AND WITHOUT CHARGE TO ANY PERSON TO WHOM THIS PROXY
STATEMENT-PROSPECTUS HAS BEEN DELIVERED. REQUESTS FOR SUCH DOCUMENTS SHOULD BE
DIRECTED TO ZIONS BANCORPORATION, ONE SOUTH MAIN, SUITE 1380, SALT LAKE CITY,
UTAH 84111, ATTENTION: DALE M. GIBBONS, SENIOR VICE PRESIDENT (801-524-4787),
AS TO ZIONS DOCUMENTS; AND VECTRA BANKING CORPORATION, 1650 SOUTH COLORADO
BOULEVARD, SUITE 320, DENVER, COLORADO 80222, ATTENTION: RAY L. NASH, CHIEF
FINANCIAL OFFICER (303-782-7440). IN ORDER TO ENSURE TIMELY DELIVERY OF SUCH
DOCUMENTS PRIOR TO THE SPECIAL MEETING, ANY REQUEST SHOULD BE MADE NOT LATER
THAN DECEMBER 19, 1997.
 
  All information contained in this Proxy Statement-Prospectus with respect to
Zions and its subsidiaries has been supplied by Zions, and all information
with respect to Vectra and its subsidiaries has been supplied by Vectra.
 
                               ----------------
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION OTHER THAN THOSE CONTAINED IN THIS PROXY STATEMENT-PROSPECTUS
IN CONNECTION WITH THE SOLICITATION OF PROXIES OR THE OFFERING OF SECURITIES
MADE HEREBY, AND IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION SHOULD
NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED. THIS PROXY STATEMENT-PROSPECTUS
DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO
PURCHASE, THE SECURITIES OFFERED BY THIS PROXY STATEMENT-PROSPECTUS, OR THE
SOLICITATION OF A PROXY, BY ANY PERSON IN ANY JURISDICTION IN WHICH SUCH AN
OFFER OR SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH
OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO OR TO ANY PERSON TO WHOM IT IS
UNLAWFUL TO MAKE SUCH AN OFFER, OR SOLICITATION OF AN OFFER, OR PROXY
SOLICITATION. NEITHER DELIVERY OF THIS PROXY STATEMENT-PROSPECTUS NOR ANY
DISTRIBUTION OF THE SECURITIES BEING OFFERED PURSUANT TO THIS PROXY STATEMENT-
PROSPECTUS SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE
HAS BEEN NO CHANGE IN THE INFORMATION SET FORTH HEREIN OR THEREIN SINCE THE
DATE OF THIS PROXY STATEMENT-PROSPECTUS.
 
                               ----------------
 
                          FORWARD-LOOKING STATEMENTS
 
  Certain statements included or incorporated by reference in this Proxy
Statement-Prospectus, including without limitation statements containing the
words "believes," "anticipates," "intends," "expects" and words of similar
import, constitute forward-looking statements. Such forward-looking statements
involve known and unknown risks, uncertainties and other factors that may
cause the actual results, performance or achievements of Zions to be
materially different from any future results, performance or achievements
expressed or implied by such forward-looking statements. Such factors include,
among others, the following: general economic conditions in Zions' market
areas; variances in interest rates; changes in or amendments to regulatory
authorities capital requirements or other regulations applicable to Zions'
banking subsidiaries; increased competition for loans and deposits; and other
factors referred to elsewhere in this Proxy Statement-Prospectus and the
documents incorporated by reference herein. GIVEN THESE UNCERTAINTIES, VECTRA
SHAREHOLDERS ARE CAUTIONED NOT TO PLACE UNDUE RELIANCE ON SUCH FORWARD-LOOKING
STATEMENTS. Zions disclaims any obligation to update any such factors or to
publicly announce the result of any revisions to any of the forward-looking
statements included or incorporated by reference herein to reflect future
events or developments.
 
                                       3
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
AVAILABLE INFORMATION......................................................   2
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE..........................   2
INDEX OF CERTAIN DEFINED TERMS.............................................   6
SUMMARY....................................................................   8
  The Companies............................................................   8
  The Special Meeting......................................................   9
  The Merger...............................................................  10
  The Merger Agreement.....................................................  12
  Stock Option Agreement...................................................  13
  Comparison of Shareholder Rights; "Anti-Takeover" Provisions.............  14
  Markets and Market Prices................................................  14
  Selected Financial Information (Historical)..............................  16
  Selected Unaudited Pro Forma Combined Financial Data.....................  17
  Comparative Per Share Data...............................................  18
THE COMPANIES..............................................................  19
  Zions....................................................................  19
  Vectra...................................................................  19
  Zions Loan to Vectra.....................................................  19
THE SPECIAL MEETING........................................................  21
  Date, Time and Place.....................................................  21
  Matters to be Considered at the Special Meeting..........................  21
  Record Date; Stock Entitled to Vote......................................  21
  Votes Required; Quorum...................................................  21
  Voting of Proxies........................................................  21
  Revocability of Proxies..................................................  22
  Solicitation of Proxies..................................................  22
  Security Ownership of Certain Beneficial Owners and Management...........  22
THE MERGER.................................................................  23
  Background of the Merger.................................................  23
  Effect of Merger.........................................................  25
  Reasons for the Merger; Recommendation of the Board of Directors.........  26
  Opinion of Financial Advisor.............................................  28
  Certain Federal Income Tax Consequences..................................  30
  Regulatory Approvals.....................................................  32
  Resale of Zions Common Stock.............................................  33
  Interests of Certain Persons in the Merger...............................  33
  Dissenters' Rights.......................................................  35
  Accounting Treatment.....................................................  36
THE MERGER AGREEMENT.......................................................  37
  The Merger...............................................................  37
  Conversion of Vectra Stock...............................................  37
  Effective Time...........................................................  37
  Exchange of Stock Certificates...........................................  37
  Conduct of Business Prior to the Merger..................................  38
  Certain Covenants........................................................  39
  Conditions...............................................................  41
  Waiver and Amendment.....................................................  42
  Termination; Conversion Number Adjustment................................  42
</TABLE>
 
 
                                       4
<PAGE>
 
                         TABLE OF CONTENTS--(CONTINUED)
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
THE STOCK OPTION AGREEMENT................................................  44
  General.................................................................  44
  The Option..............................................................  44
  Termination of Option...................................................  44
THE SHAREHOLDER AGREEMENTS................................................  46
VOTING SECURITIES AND PRINCIPAL SHAREHOLDERS OF ZIONS.....................  47
CERTAIN DIFFERENCES IN THE RIGHTS OF ZIONS SHAREHOLDERS AND VECTRA
 SHAREHOLDERS.............................................................  48
  General.................................................................  48
  Voting Rights...........................................................  48
  Shareholder Rights Plan.................................................  49
  Board of Directors......................................................  49
  Shareholder Meetings....................................................  50
  Amendment of Articles and Bylaws........................................  50
  Dissenters' Rights......................................................  51
  Dividend Rights.........................................................  51
  Liquidation Rights......................................................  52
DISSENTERS' RIGHTS........................................................  52
  Dissenters' Rights......................................................  52
  Who May Dissent.........................................................  53
  Requirements to be Met..................................................  53
  Notice Required to be Given by Vectra...................................  53
  Dissenter's Procedures to Demand Payment................................  54
  Payment for Shares......................................................  54
  Failure to Effect Merger................................................  54
  Shares Acquired After Announcement of Merger Agreement..................  54
  Dissenter's Procedure if Dissatisfied With Vectra Payment or Offer......  55
  Court Action for Approval...............................................  55
VALIDITY OF ZIONS COMMON STOCK............................................  56
EXPERTS...................................................................  56
</TABLE>
 
                               LIST OF APPENDICES
 
 Appendix A -- Agreement and Plan of Merger, dated as of September 23, 1997,
               between Zions and Vectra.
 Appendix B -- Stock Option Agreement, dated as of September 23, 1997, between
               Zions and Vectra.
 Appendix C -- Fairness Opinion of The Wallach Company.
 Appendix D -- Article 113 of the CBCA.
 
                                       5
<PAGE>
 
                         INDEX OF CERTAIN DEFINED TERMS
 
<TABLE>
<CAPTION>
                                                                        DEFINED
          TERM                                                          AT PAGE
          ----                                                          -------
<S>                                                                     <C>
Acquiring Person.......................................................    49
Acquisition Transaction................................................    44
Announcement Date......................................................    54
Article 113............................................................    52
Aspen..................................................................    23
Average Closing Price..................................................    13
Beneficial Ownership...................................................    47
BHCA...................................................................     8
CBCA...................................................................     1
Centennial.............................................................     8
Certificate............................................................    37
Code...................................................................    11
Commission.............................................................     2
Common Conversion Number...............................................     1
CRA....................................................................    32
Determination Date.....................................................    13
Dissenter..............................................................    54
Dissenters' Notice.....................................................    53
Dissenter's Response Notice............................................    55
Dissenters' Rights.....................................................    12
Effective Date.........................................................    13
Effective Time.........................................................    12
Employment Agreement...................................................    34
Exchange Act...........................................................     2
Exchange Agent.........................................................    37
Exchange Offer.........................................................    45
FDC....................................................................     9
Federal Reserve Board..................................................    12
Flip-in Date...........................................................    49
FRB Notice.............................................................    12
Governmental Authority.................................................    41
Governmental Entity....................................................    45
Indemnified Parties....................................................    40
Index Group............................................................    42
Index Ratio............................................................    43
Inside Shareholders....................................................    46
Justified Self-Termination.............................................    34
KBW Index..............................................................    13
Letter of Transmittal..................................................    37
Maximum Amount.........................................................    40
Merger.................................................................     1
Merger Agreement.......................................................     1
Merger Consideration...................................................    11
NationsBank Loan.......................................................     9
NASDAQ.................................................................     1
NBA....................................................................     8
New Certificates.......................................................    37
NYSE...................................................................    13
Option.................................................................    14
</TABLE>
 
 
                                       6
<PAGE>
 
                  INDEX OF CERTAIN DEFINED TERMS--(CONTINUED)
 
<TABLE>
<CAPTION>
                                                                        DEFINED
          TERM                                                          AT PAGE
          ----                                                          -------
<S>                                                                     <C>
Payment Demand.........................................................    54
Payment Demand Date....................................................    53
Period of Employment...................................................    34
Pitkin.................................................................     8
Preferred Conversion Number............................................     1
Preliminary Purchase Event.............................................    45
Price Termination Event................................................    13
Record Date............................................................    10
Registration Statement.................................................     2
Rights.................................................................    49
Securities Act.........................................................     2
Shareholder Agreements.................................................    10
Shareholder's Notice of Intent to Dissent..............................    53
Southwest..............................................................     9
Special Meeting........................................................     1
Starting Price.........................................................    13
State Board............................................................    12
Stock Option Agreement.................................................    14
Surviving Corporation..................................................     1
Tender offer...........................................................    45
Treasury Stock.........................................................     1
Tri-State..............................................................     8
U.S. Holder............................................................    30
Valley.................................................................     8
Vectra.................................................................     1
Vectra Bank............................................................     9
Vectra Board...........................................................     1
Vectra Bylaws..........................................................    14
Vectra Charter.........................................................    14
Vectra Common Shareholders.............................................     1
Vectra Common Stock....................................................     1
Vectra Preferred Shareholders..........................................     1
Vectra Preferred Stock.................................................     1
Vectra Shareholders....................................................     1
Vectra Stock...........................................................     1
Vectra Stock Options...................................................     1
Vectra Stock Plans.....................................................    35
Wallach................................................................    11
ZFNB...................................................................     8
Zions..................................................................     1
Zions Board............................................................    11
Zions Bylaws...........................................................    14
Zions Charter..........................................................    14
Zions Common Stock.....................................................     1
Zions Ratio............................................................    43
Zions Rights Plan......................................................    49
</TABLE>
 
                                       7
<PAGE>
 
                                    SUMMARY
 
  The following summary is not intended to be complete and is qualified in all
respects by the more detailed information included in this Proxy Statement-
Prospectus, the Appendices hereto and the documents incorporated herein by
reference. Vectra Shareholders are urged to read carefully this Proxy
Statement-Prospectus, including the Appendices hereto and the documents
incorporated herein by reference, in its entirety. Unless the context otherwise
requires, references to "Zions" herein shall be to Zions and its subsidiaries
and references to "Vectra" herein shall be to Vectra and its subsidiaries.
 
THE COMPANIES
 
 Zions
 
  Zions is a bank holding company registered under the Bank Holding Company Act
of 1956, as amended (the "BHCA"), and organized under the laws of Utah, engaged
primarily in the commercial banking business through its banking subsidiaries.
Zions' principal executive offices are located at One South Main, Suite 1380,
Salt Lake City, Utah 84111 (telephone: 801-524-4787). Zions is the second
largest bank holding company headquartered in Utah. Zions First National Bank
("ZFNB"), Salt Lake City, Utah, founded in 1873, is a wholly owned subsidiary
of Zions (except for directors' qualifying shares) and as of September 30, 1997
had 109 offices located throughout the State of Utah, plus one foreign office.
ZFNB is the second largest commercial banking organization headquartered in the
State of Utah. As of September 30, 1997, ZFNB also had 14 offices in Idaho.
 
  Zions also owns Nevada State Bank, Las Vegas, Nevada; National Bank of
Arizona ("NBA"), Phoenix, Arizona; Pitkin County Bank and Trust Co. ("Pitkin"),
Aspen, Colorado; Valley National Bank of Cortez ("Valley"), Cortez, Colorado;
and Centennial Savings Bank, F.S.B. ("Centennial"), Durango, Colorado. As of
September 30, 1997, Nevada State Bank operated 32 offices in Nevada and was the
fifth largest commercial bank in Nevada; NBA operated 28 offices in Arizona and
was the fifth largest commercial bank in Arizona. Through Pitkin, Valley and
Centennial, Zions operates its commercial banking and thrift business through
12 branches in western Colorado and one branch in northwestern New Mexico.
 
  Subsequent to September 30, 1997, ZFNB has opened two branch offices in Utah
and added one de novo office in Idaho. In addition, on October 17, 1997 Zions
acquired Sun State Bank, Las Vegas, Nevada, with 5 branches in Nevada and, on
the same date, merged Sun State Bank into Nevada State Bank. Zions has also
entered into an agreement to acquire The First National Bank in Alamosa in
Alamosa, Colorado, with 3 branches in Colorado. The acquisition is currently
expected to close in the fourth quarter of 1997. On November 14, 1997, Zions
acquired GB Bancorporation, the principal subsidiary of which, Grossmont Bank,
operates 14 branches in San Diego County, California. On September 23, 1997,
Zions entered into an agreement with Tri-State Finance Corporation, a Colorado
corporation ("Tri-State"), pursuant to which Tri-State will merge with and into
a subsidiary of Zions; Tri-State Bank, a subsidiary of Tri-State, operates 1
branch in each of Denver and Boulder, Colorado. Zions will issue an additional
710,000 shares of Zions Common Stock in connection with the acquisition of Tri-
State. It is currently intended that the acquisition of Tri-State will be
accounted for under the "pooling of interests" method of accounting.
 
  At September 30, 1997, Zions had total consolidated assets of approximately
$9.1 billion, deposits of $5.7 billion, and shareholders' equity of $0.6
billion. See "The Companies--Zions".
 
                                       8
<PAGE>
 
 
 Vectra
 
  Vectra is the second largest independent Colorado-based bank holding company,
with a total of 16 banking locations serving the Denver/Boulder metropolitan
area. In addition, Vectra expects to open an additional branch location in
December 1997. Through its bank subsidiary, Vectra Bank ("Vectra Bank"), Vectra
provides a broad range of banking products and services primarily to consumers
and small to medium sized businesses. The Company was founded in 1988 by two
senior banking executives who, together with a small group of investors,
provided $9.8 million in initial capital to Vectra. Vectra's initial objective
was to acquire several strategically located community banks and transform them
into a banking system that would provide a broad package of products and
services to its customers and growth potential to its shareholders. In 1989,
the Company acquired its initial eight locations having total assets of $156
million. Since that time, Vectra has grown significantly through a combination
of internal growth and acquisitions. At September 30, 1997, Vectra had total
assets of approximately $690 million.
 
  In November 1995, Vectra completed a merger of First Denver Corporation
("FDC"), a bank holding company whose primary operating subsidiary was First
National Bank of Denver, into Vectra. This acquisition added approximately $44
million in deposits and $17 million in loans. In June 1996, Vectra acquired
Bank Land Company, a bank holding company whose primary operating subsidiary
was Southwest State Bank ("Southwest"). This acquisition added approximately
$96 million in deposits and $74 million in loans. In April 1997, Vectra opened
a loan production office in Longmont, Colorado. In August 1997, Vectra acquired
Professional Bank, a Denver based bank with two locations, loans of $52 million
and deposits of $68 million. Also in August 1997, Vectra opened a branch in
Commerce City, Colorado. The addition of FDC, Southwest, Professional Bank,
Longmont and Commerce City banking locations has allowed Vectra to serve a
broader base of households and businesses within its market and to achieve
growth in assets and revenue without a proportionate growth in expenses.
 
  Vectra's operating strategy has been to build a growing, profitable community
banking network. The principal elements of this strategy have been to (i) focus
on the financial service needs of consumers and small to medium sized
businesses by combining the elements of service traditionally found in
community banks with product lines typically found in large banks, (ii)
emphasize high quality customer service in all aspects of operations, (iii)
maintain high asset quality and (iv) achieve efficiencies through centralized
administrative and support functions.
 
  The Company's principal executive office is located at 1650 South Colorado
Boulevard, Suite 320, Denver, Colorado 80222 (telephone: (303) 782-7440).
 
 Zions Loan to Vectra
 
  It is currently expected that Zions will loan Vectra up to $10 million prior
to the Effective Date. Vectra intends to use up to $4,050,000 of the net
proceeds from that loan to repay its outstanding loan in the principal amount
of $4,050,000 from NationsBank, N.A. (the "NationsBank Loan"). Pursuant to the
NationsBank Loan and related agreements, Vectra had pledged all the outstanding
shares of capital stock of Vectra Bank to NationsBank, N.A. In connection with
the loan from Zions, that pledge arrangement will be terminated and Vectra will
pledge the shares of capital stock of Vectra Bank to Zions. The remainder of
the net proceeds from the loan from Zions will be used for general corporate
purposes, including the possible repurchase by Vectra of shares of Vectra
Common Stock prior to the Effective Date.
 
THE SPECIAL MEETING
 
 Date, Time and Place
 
  The Special Meeting is scheduled to be held in the lobby of the headquarters
of Vectra, 1650 South Colorado Boulevard, on Monday, December 29, 1997 at 8:00
a.m., local time.
 
                                       9
<PAGE>
 
 
 Matters to be Considered at the Special Meeting
 
  The purposes of the Special Meeting are (a) to consider and vote upon the
approval of the Merger and (b) to transact such other business as may properly
come before the Special Meeting or any adjournments or postponements thereof.
See "The Special Meeting--Matters to be Considered at the Special Meeting."
 
 Record Date; Stock Entitled to Vote
 
  Only holders of record of Vectra Stock at the close of business on 
November 7, 1997 (the "Record Date") will be entitled to receive notice of, and
to vote at, the Special Meeting and any postponements or adjournments thereof.
As of the Record Date, there were 4,865,692 shares of Vectra Common Stock and
108,754 shares of Vectra Preferred Stock outstanding. See "The Special Meeting--
Record Date; Stock Entitled to Vote."
 
 Votes Required; Quorum
 
  The affirmative vote of the holders of at least a majority of the total
number of outstanding shares of Vectra Common Stock entitled to vote at the
Special Meeting and the affirmative vote of the holders of at least a majority
of the total number of outstanding shares of Vectra Preferred Stock entitled to
vote at the Special Meeting, each voting as a separate group, are required to
approve the Merger. Each holder of shares of Vectra Stock outstanding on the
Record Date will be entitled to one vote for each share held of record upon
each matter properly submitted at the Special Meeting and any postponement or
adjournment thereof. A majority of all shares of Vectra Common Stock entitled
to vote, represented in person or by proxy, constitutes a quorum with respect
to the Vectra Common Stock. A majority of all shares of Vectra Preferred Stock
entitled to vote, represented in person or by proxy, constitutes a quorum with
respect to the Vectra Preferred Stock. The Vectra Common Stock and the Vectra
Preferred Stock comprise separate voting groups with respect to the matters to
be acted upon at the Special Meeting. Abstentions and broker non-votes are each
included in the determination of the number of shares present; however, they
are not counted as votes in favor of the Merger. See "The Special Meeting--
Votes Required; Quorum."
 
 Security Ownership of Certain Beneficial Owners and Management
 
  As of the Record Date, the directors and officers of Vectra beneficially
held, in the aggregate, the ability to direct the voting with respect to
886,795 shares of Vectra Common Stock, comprising approximately 17.9% of the
voting power of the Vectra Common Stock outstanding on the Record Date. In
addition, pursuant to shareholder agreements (the "Shareholder Agreements")
entered into in connection with the Merger Agreement, all of the directors and
one non-director executive officer of Vectra, in their capacity as Vectra
Shareholders, together holding or controlling an aggregate of 845,150 shares of
Vectra Common Stock (or approximately 17.4% of the shares of Vectra Common
Stock outstanding on the Record Date), and 31,079 shares of Vectra Preferred
Stock (or approximately 28.6% of the shares of Vectra Preferred Stock
outstanding on the Record Date) have agreed to vote their shares in favor of
the Merger.
 
  See "The Special Meeting--Security Ownership of Certain Beneficial Owners and
Management" and "The Shareholder Agreements."
 
THE MERGER
 
 Effect of Merger
 
  At the Effective Time, Vectra will merge with and into Zions, and Zions will
be the Surviving Corporation in the Merger and will continue its corporate
existence under Utah law. The separate corporate existence of Vectra will then
cease.
 
                                       10
<PAGE>
 
 
  Upon the Merger becoming effective, (a) each share of Vectra Common Stock
issued and outstanding at the Effective Time (other than Treasury Stock) will
be converted automatically into the right to receive 0.685 of a share of Zions
Common Stock, with any rights attached thereto under or by virtue of the Zions
Rights Plan, and (b) each share of Vectra Preferred Stock issued and
outstanding at the Effective Time (other than (i) Treasury Stock and (ii)
shares which have not been voted in favor of the Merger and with respect to
which Dissenters' Rights shall have been perfected in accordance with the CBCA)
will be converted automatically at the Effective Time into the right to receive
7.755 shares of Zions Common Stock, with any rights attached thereto under or
by virtue of the Zions Rights Plan. Each of the Common Conversion Number and
the Preferred Conversion Number is subject to upward (but not downward)
adjustment under certain circumstances, as described herein. See "The Merger
Agreement--Effective Time," "--The Merger," "Summary--Termination; Conversion
Number Adjustment" and "The Merger--Termination; Conversion Number Adjustment."
The shares of Zions Common Stock to be issued in connection with the Merger,
and cash in lieu of fractional share interests, are herein referred to as the
"Merger Consideration."
 
 Reasons for the Merger; Recommendation of the Board of Directors of Vectra
 
  Vectra. The Vectra Board has unanimously approved the Merger Agreement and
the transactions contemplated thereby. THE MEMBERS OF THE VECTRA BOARD
UNANIMOUSLY BELIEVE THAT THE MERGER AND THE TRANSACTIONS CONTEMPLATED BY THE
MERGER AGREEMENT ARE FAIR TO, AND ARE IN THE BEST INTERESTS OF, THE VECTRA
SHAREHOLDERS AND UNANIMOUSLY RECOMMEND A VOTE "FOR" THE MATTERS TO BE VOTED
UPON BY THE VECTRA SHAREHOLDERS IN CONNECTION WITH THE MERGER. THE CONCLUSION
OF THE VECTRA BOARD WITH RESPECT TO THE MERGER IS BASED UPON A NUMBER OF
FACTORS. See "The Merger--Background of the Merger," "--Reasons for the Merger;
Recommendation of the Board of Directors" and "--Opinion of Financial Advisor."
 
  Zions. The Board of Directors of Zions (the "Zions Board") has unanimously
approved the Merger Agreement and determined that the Merger and the issuance
of the Zions Common Stock pursuant thereto are in the best interests of Zions
and its shareholders. The approval of the Merger Agreement by the shareholders
of Zions is not required.
 
 Opinion of Financial Advisor
 
  The Wallach Company, Inc. ("Wallach") has served as financial advisor to
Vectra in connection with the Merger and has delivered an opinion to the Vectra
Board that, as of September 23, 1997, the Merger Consideration was fair to the
Vectra Shareholders from a financial point of view. Wallach has also delivered
a written opinion to the Vectra Board that, as of the date of this Proxy
Statement-Prospectus, the Merger Consideration is fair to the Vectra
Shareholders from a financial point of view. For additional information, see
"The Merger--Opinion of Financial Advisor." The opinion of Wallach, dated the
date of this Proxy Statement-Prospectus, is attached as Appendix C to this
Proxy Statement-Prospectus. Vectra Shareholders are urged to read such opinion
in its entirety for descriptions of the procedures followed, matters considered
and limitations on the reviews undertaken in connection therewith. See "The
Merger--Opinion of Financial Advisor."
 
 Certain Federal Tax Consequences
 
  The Merger is intended to be a tax-free reorganization within the meaning of
Section 368(a) of the Internal Revenue Code of 1986, as amended (the "Code").
Consummation of the Merger is conditional, among other things, on delivery to
Vectra, immediately prior to the Effective Time, of the opinion of Lewis, Rice
& Fingersh, L.C. to the effect that (i) the Merger constitutes a
"reorganization" within the meaning of Section 368 of the Code and (ii) no gain
or loss will be recognized by Vectra Shareholders who receive shares of Zions
Common Stock in exchange for shares of Vectra Stock, except with respect to
cash received in lieu of fractional share interests and, in the case of the
Vectra Preferred Shareholders, with respect to cash received upon the exercise
of Dissenters' Rights, and on delivery to Zions, immediately prior to the
Effective Time, of the opinion of Sullivan & Cromwell to the effect that the
Merger constitutes a "reorganization" under Section 368 of the Code. See "The
Merger--Certain Federal Income Tax Consequences" and "The Merger Agreement--
Conditions."
 
                                       11
<PAGE>
 
 
  Because of the complexity of the tax laws and the individual nature of the
tax consequences of the Merger to each Vectra Shareholder, each Vectra
Shareholder should consult a tax advisor concerning certain other federal and
all state, local and foreign tax consequences of the Merger that may be
applicable.
 
 Regulatory Approvals
 
  The Merger is subject to prior approval by the Board of Governors of The
Federal Reserve System (the "Federal Reserve Board") under Section 3 of the
BHCA and the Colorado banking board (the "State Board") pursuant to Sections
11-2-109 and 11-6.4-103 of the Colorado Financial Institutions Code. On October
23, 1997, Zions submitted a notice to the Federal Reserve Board (the "FRB
Notice") and submitted an application for change of control with respect to
Vectra Bank and a copy of the FRB Notice with the State Board seeking approval
of the Merger and related matters. See "The Merger--Regulatory Approvals" and
"The Merger Agreement--Conditions."
 
 Dissenters' Rights
 
  In connection with the Merger, Vectra Preferred Shareholders may be entitled
to dissenters' rights under Article 113 of the CBCA ("Dissenters' Rights") the
text of which is attached hereto as Appendix D. Vectra Preferred Shareholders
who do not vote in favor of the Merger and who fully comply with the applicable
provisions of Article 113 of the CBCA have the right to require the purchase of
the shares of Vectra Preferred Stock held by them for cash at the fair market
value of those shares immediately before the Effective Date (as defined herein)
of the Merger, excluding any appreciation or depreciation in anticipation of
the Merger except to the extent that exclusion would be inequitable. FAILURE TO
COMPLY STRICTLY WITH THE PROVISIONS OF ARTICLE 113 OF THE CBCA MAY RESULT IN A
WAIVER OR FORFEITURE OF SUCH DISSENTERS' RIGHTS. SEE "THE MERGER--DISSENTERS'
RIGHTS" AND "DISSENTERS' RIGHTS."
 
 Interests of Certain Persons in the Merger
 
  In considering the recommendation of the Vectra Board, Vectra Shareholders
should be aware that certain members of the Board of Directors and management
of Vectra have interests in the transactions contemplated by the Merger
Agreement that are in addition to the interests of Vectra Shareholders
generally and which may create potential conflicts of interest. These interests
include, among other things, (i) in connection with the Merger, Vectra Bank
entered into an employment agreement and non-competition agreement with Gary S.
Judd, President and Chief Executive Officer of Vectra Bank; (ii) Zions will
indemnify the directors and officers of Vectra and Vectra Bank from certain
liabilities and provide them with directors' and officers' liability insurance;
(iii) Vectra Stock Options held by directors and certain officers of Vectra
will be converted into stock options with respect to Zions Common Stock; and
(iv) change of control provisions in an existing non-competition agreement with
a Vectra director and executive officer will be triggered. See "The Merger--
Interests of Certain Persons in the Merger" and "The Merger Agreement--Certain
Covenants."
 
 Accounting Treatment
 
  For accounting and financial reporting purposes, it is intended that the
Merger will be accounted for as a pooling-of-interests in accordance with
generally accepted accounting principles. See "The Merger--Accounting
Treatment."
 
THE MERGER AGREEMENT
 
 Effective Time
 
  The Merger will become effective (the "Effective Time") on the date and at
the time that articles of merger and related documents are filed with the Utah
Division of Corporations and Commercial Code and the Secretary
 
                                       12
<PAGE>
 
of State of the State of Colorado or such later date as may be specified in
such articles (such date on which the Effective Time occurs, the "Effective
Date"). Subject to satisfaction or waiver of the conditions specified in the
Merger Agreement, the parties expect the Merger to become effective in the
first quarter of 1998, although there can be no assurance as to whether or when
the Merger will occur. See "The Merger Agreement--Effective Time" and "--
Conditions."
 
 Conditions to the Merger
 
  Consummation of the Merger is subject to various conditions, including
receipt of the shareholder approval solicited hereby, receipt of the necessary
regulatory approvals, receipt of opinion of counsel in respect of certain
federal income tax consequences of the Merger and other matters and
satisfaction of other closing conditions. See "The Merger Agreement--
Conditions."
 
 Waiver and Amendment
 
  Prior to the Effective Time, any provision of the Merger Agreement may be
waived by the party benefitted by the provision, or amended or modified at any
time (including the structure of the transaction) by an agreement in writing
between the parties and approved by the respective Boards of Directors, except
that after the Special Meeting, the Merger Agreement may not be amended if it
would violate the CBCA or reduce the consideration to be received by Vectra
Shareholders in the Merger. See "The Merger Agreement--Waiver and Amendment."
 
 Termination; Conversion Number Adjustment
 
  The Merger Agreement may be terminated, and the Merger abandoned, prior to
the Effective Time, either before or after its approval by the Vectra
Shareholders, upon the occurrence of various events and under certain
circumstances, including by the mutual consent of Zions and Vectra, or by
action of the board of directors of either company under certain circumstances,
including if the Merger is not consummated by March 31, 1998, unless the
failure to consummate by that time is due to knowing action or inaction of the
party seeking to terminate.
 
  In addition, the Vectra Board may terminate the Merger Agreement if:
 
    (i) the average of the daily closing prices of Zions Common Stock for a
  15 consecutive full trading day period ending on the fifth trading day (the
  "Determination Date") prior to the Effective Date (the "Average Closing
  Price") is less than the average of the daily closing prices for Zions
  Common Stock for a 10 consecutive full trading day period commencing
  September 17, 1997 (the "Starting Price"); and
 
    (ii) (A) the number obtained by dividing the Average Closing Price by the
  Starting Price is less than (B) the number obtained by dividing (x) the
  average of the KBW 50 Index of Keefe, Bruyette & Woods, Inc. (the "KBW
  Index") for a 10 consecutive full New York Stock Exchange, Inc. ("NYSE")
  trading day period ending on the Determination Date by (y) the average of
  the KBW Index for a 10 consecutive full NYSE trading day period commencing
  September 17, 1997 and multiplying the quotient by 0.82 (a "Price
  Termination Event").
 
  If a Price Termination Event occurs and Vectra notifies Zions of its
intention to terminate the Merger Agreement, Zions may within a specified
period of time increase the Common Conversion Number and the Preferred
Conversion Number as more fully described herein, in which event the Merger
Agreement will continue in effect as so adjusted. See "The Merger Agreement--
Termination; Conversion Number Adjustment."
 
STOCK OPTION AGREEMENT
 
  As an inducement to the willingness of Zions to continue to pursue the
transactions contemplated by the Merger Agreement, Vectra, as issuer, entered
into a stock option agreement with Zions, as grantee, dated as of
 
                                       13
<PAGE>
 
September 23, 1997 (the "Stock Option Agreement"). The Stock Option Agreement
is attached hereto as Appendix B and is incorporated by reference herein.
 
  Pursuant to the Stock Option Agreement, Vectra granted to Zions an
irrevocable option (the "Option") pursuant to which Zions has the right, upon
the occurrence of certain events (none of which has occurred to the best of
Zions' and Vectra's knowledge), to purchase up to 959,462 shares of Vectra
Common Stock, subject to adjustment in certain cases as described below but in
no event exceeding 19.9% of the number of shares of Vectra Common Stock
outstanding immediately before exercise of the Option, subject to termination
during certain periods, for a purchase price of $23.39 per share, subject to
adjustment in certain circumstances.
 
  Under certain circumstances, Zions also could elect to sell the Option, and
any shares previously purchased thereunder, back to Vectra at a price generally
reflecting the price offered or paid by a third-party acquirer for other shares
of Vectra.
 
  Provided that Zions is not in material breach of the agreements or covenants
contained in the Merger Agreement or the Stock Option Agreement and no
preliminary or permanent injunction or other order against delivery of shares
covered by the Option issued by any court of competent jurisdiction in the
United States shall be in effect, Zions may exercise the Option following the
occurrence of a Purchase Event (as defined herein). The purchase of any shares
of Vectra Common Stock pursuant to the Option is subject to compliance with
applicable law, including the receipt of necessary approvals under the BHCA.
 
  Arrangements such as the Stock Option Agreement are entered into in
connection with corporate mergers and acquisitions in an effort to increase the
likelihood that the transactions will be consummated in accordance with their
terms and to compensate the grantee for the efforts undertaken and the
expenses, losses and opportunity costs incurred by it in connection with the
transactions if they are not consummated under certain circumstances involving
an acquisition or potential acquisition of the issuer by a third party. The
Stock Option Agreement was entered into to accomplish these objectives. The
Stock Option Agreement may have the effect of discouraging offers by third
parties to acquire Vectra prior to the Merger, even if such persons might have
been prepared to offer to pay consideration to Vectra Shareholders that has a
higher current market price than the shares of Zions Common Stock to be
received by such holders pursuant to the Merger Agreement. See "The Merger--
Background of the Merger," "--Reasons for the Merger; Recommendation of the
Board of Directors," "--Stock Option Agreement" and Appendix B to this Proxy
Statement-Prospectus.
 
COMPARISON OF SHAREHOLDER RIGHTS; "ANTI-TAKEOVER" PROVISIONS
 
  The rights of Vectra Shareholders currently are determined by reference to
the CBCA, Vectra's articles of incorporation (the "Vectra Charter") and
Vectra's bylaws (the "Vectra Bylaws"). At the Effective Time, Vectra
Shareholders will become shareholders of the Surviving Corporation. Their
rights as shareholders will then be determined by reference to the Utah Revised
Business Corporation Act, Zions' articles of incorporation (the "Zions
Charter") and Zions' bylaws (the "Zions Bylaws"). The Zions Charter and Zions
Bylaws contain provisions which may be considered to be anti-takeover in
nature, including staggered terms of office for directors, absence of
cumulative voting and special shareholder vote requirements for certain types
of extraordinary corporate transactions. Additionally, Zions has adopted a
shareholders' rights plan which will have the effect of encouraging entities
interested in acquiring Zions to negotiate any such transactions with Zions'
management and of deterring or discouraging unfriendly takeovers by making any
such takeover substantially more expensive to the entity sponsoring the
unfriendly takeover. See "Certain Differences in the Rights of Zions
Shareholders and Vectra Shareholders."
 
MARKETS AND MARKET PRICES
 
  Zions Common Stock and Vectra Common Stock are currently traded on NASDAQ
under the symbol "ZION" and "VTRA," respectively. There is no public market for
the Vectra Preferred Stock and, to Vectra's
 
                                       14
<PAGE>
 
knowledge, there have been no transfers of shares of Vectra Preferred Stock.
The following table sets forth (i) the closing price per share of Zions Common
Stock; (ii) the closing price per share of Vectra Common Stock; (iii) the
equivalent per share price for Vectra Common Stock (based upon the Common
Conversion Number); and (iv) the equivalent per share price for Vectra
Preferred Stock (based upon the Preferred Conversion Number) all at the close
of business on September 23, 1997, the last trading day immediately preceding
public announcement of the Merger, and November 18, 1997:
 
<TABLE>
<CAPTION>
                                                           EQUIVALENT EQUIVALENT
                                                           PRICE PER  PRICE PER
                                             ZIONS  VECTRA   VECTRA     VECTRA
                                             COMMON COMMON   COMMON   PREFERRED
                                             STOCK  STOCK   SHARE(1)   SHARE(2)
                                             ------ ------ ---------- ----------
     <S>                                     <C>    <C>    <C>        <C>
     September 23, 1997..................... $41.13 $23.63   $28.17    $318.92
     November 18, 1997...................... $39.75 $26.13   $27.23    $308.26
</TABLE>
- --------
(1) The equivalent price per share of Vectra Common Stock at the specified date
    represents the closing price of a share of Zions Common Stock on such date
    multiplied by the Common Conversion Number.
 
(2) The equivalent price per share of Vectra Preferred Stock at the specified
    date represents the closing price of a share of Zions Common Stock
    multiplied by the Preferred Conversion Number.
 
                                       15
<PAGE>
 
 
SELECTED FINANCIAL INFORMATION (HISTORICAL)
 
  The following table sets forth certain historical financial information for
Zions and Vectra. This information is based on the respective historical
financial statements of Zions and Vectra incorporated by reference and should
be read in conjunction with such statements and information and the related
notes.
 
<TABLE>
<CAPTION>
                           NINE MONTHS ENDED
                             SEPTEMBER 30,                    YEAR ENDED DECEMBER 31,
                         --------------------- ------------------------------------------------------
                            1997       1996       1996       1995       1994       1993       1992
                         ---------- ---------- ---------- ---------- ---------- ---------- ----------
                                           (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                      <C>        <C>        <C>        <C>        <C>        <C>        <C>
ZIONS
Earnings
  Net interest income... $  225,404 $  189,207 $  260,473 $  227,094 $  198,606 $  174,657 $  157,282
  Provision for loan
   losses...............      2,905      2,200      3,540      2,800      2,181      2,993     10,929
  Net income............ $   84,121 $   74,495 $  101,350 $   81,328 $   63,827 $   58,205 $   47,209
                         ========== ========== ========== ========== ========== ========== ==========
Per Share
  Net income............ $     1.41 $     1.26 $     1.71 $     1.38 $     1.09 $     1.02 $      .86
  Cash Dividends........        .35        .32        .43        .35        .29        .25        .19
Statement of Condition
 at Period End
  Assets................ $9,059,721 $6,783,341 $6,484,964 $5,620,646 $4,934,095 $4,801,054 $4,107,924
  Deposits..............  5,666,336  4,572,555  4,552,017  4,097,114  3,705,976  3,432,289  3,075,110
  Long-term debt........    251,134     55,702    251,620     56,229     58,182     59,587     99,223
  Shareholders' equity..    581,129    490,485    507,452    428,506    365,770    312,592    260,070
VECTRA
Earnings
  Net interest income... $   20,584 $   16,154 $   22,727 $   17,923 $   17,371 $   12,788 $   11,341
  Provision for loan
   losses...............        652        607        916        795        794        283        363
  Net earnings.......... $    5,197 $    3,757 $    5,445 $    3,303 $    2,675 $    2,410 $    1,518
                         ========== ========== ========== ========== ========== ========== ==========
Per Share
  Net earnings assuming
   full dilution........ $      .75 $      .59 $      .84 $      .52 $      .46 $      .63 $      .42
  Cash Dividends........        --         --         --         --         --         --         --
Statement of Condition
 at Period End
  Assets................ $  690,496 $  551,244 $  561,811 $  417,806 $  462,314 $  293,700 $  262,625
  Deposits..............    515,218    413,515    439,351    307,085    268,184    250,111    205,097
  Long-term debt........     21,550      4,050      4,050      1,051      1,109      2,077      2,352
  Shareholders' equity..     42,744     43,905     45,435     30,185     23,593     17,353     15,048
</TABLE>
 
                                       16
<PAGE>
 
 
SELECTED UNAUDITED PRO FORMA COMBINED FINANCIAL DATA
 
  The following table sets forth certain selected pro forma combined financial
data giving effect to the Merger as if it occurred as of the beginning of the
periods indicated below. The Merger is expected to be accounted for as a
"pooling of interests." This information should be read in conjunction with and
is qualified in its entirety by the consolidated financial statements and
accompanying notes of Zions and Vectra included in the documents described
under "Incorporation of Certain Information by Reference." The pro forma
amounts in the table below are presented for informational purposes and are not
necessarily indicative of the financial position or the results of operations
of the combined company that actually would have occurred had the Merger been
consummated as of the dates or for the periods presented. The pro forma amounts
are also not necessarily indicative of the future financial position or future
results of operations of Zions as the Surviving Corporation. The pro forma
amounts do not reflect any cost savings or revenue enhancements that may be
achieved as a result of the Merger. In addition, the pro forma amounts do not
reflect any of Zions' other pending acquisitions or any of Zions' acquisitions
that were consummated after September 30, 1997. See "The Companies--Zions."
 
<TABLE>
<CAPTION>
                                 NINE MONTHS
                                    ENDED         YEAR ENDED DECEMBER 31,
                                SEPTEMBER 30, --------------------------------
                                    1997         1996       1995       1994
                                ------------- ---------- ---------- ----------
                                   (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                             <C>           <C>        <C>        <C>
Earnings
  Net interest income..........  $  245,988   $  283,200 $  245,017 $  215,977
  Provision for loan losses....       3,557        4,456      3,595      2,975
  Net income...................  $   89,318   $  106,795 $   84,631 $   66,502
                                 ==========   ========== ========== ==========
Per Share
  Net income...................  $     1.39   $     1.73 $     1.39 $     1.10
  Cash Dividends...............         .35          .43        .35        .29
Statement of Condition at
 Period End
  Assets.......................  $9,750,217   $7,046,775 $6,038,452 $5,396,404
  Deposits.....................   6,181,554    4,991,368  4,404,189  3,974,160
  Long-term debt...............     272,684      255,670     57,280     59,291
  Shareholders' equity.........     623,873      552,887    458,691    389,363
</TABLE>
 
 
                                       17
<PAGE>
 
 
COMPARATIVE PER SHARE DATA
 
  The following table sets forth for the periods indicated certain historical,
pro forma and pro forma equivalent per share financial information. The
unaudited pro forma combined financial information reflects the application of
the pooling-of-interests method of accounting. The following table should be
read in conjunction with the financial information as incorporated by reference
or included herein. The pro forma data in the table, presented as of and for
the nine months ended September 30, 1997, and as of and for each of the three
years in the period ending December 31, 1996, are presented for comparative and
illustrative purposes only and are not necessarily indicative of the combined
financial position or results of operations in the future or what the combined
financial position or results of operations would have been had the Merger been
consummated during the periods or as of the dates for which the information in
the table is presented. The following data are based on the respective
historical financial statements of Zions and Vectra incorporated by reference
and should be read in conjunction with such financial statements and such
information and the related notes to each. The Pro Forma Combined amounts
represent the pro forma results of the combined companies (without giving
effect to Zions' other pending acquisitions) and the Equivalent Pro Forma
amounts are computed by multiplying the Pro Forma Combined amounts by the
Common Conversion Number.
 
<TABLE>
<CAPTION>
                                                 NINE MONTHS     YEARS ENDED
                                                    ENDED       DECEMBER 31,
                                                SEPTEMBER 30, -----------------
                                                    1997      1996  1995  1994
                                                ------------- ----- ----- -----
<S>                                             <C>           <C>   <C>   <C>
Net Income Per Common Share
  Zions........................................     $1.41     $1.71 $1.38 $1.09
  Vectra(1)....................................       .75       .84   .52   .46
  Pro Forma Combined per Zions Common Share....      1.39      1.73  1.39  1.10
  Equivalent Pro Forma per Vectra Common Share.       .95      1.19   .95   .75
Book Value Per Common Share
  Zions........................................     $9.78     $8.61  7.36  6.28
  Vectra(2)....................................      7.02      6.19  4.62  3.24
  Pro Forma Combined per Zions Common Share....      9.83      8.77  7.46  6.33
  Equivalent Pro Forma per Vectra Common Share.      6.73      6.01  5.11  4.34
Cash Dividends Declared Per Common Share
  Zions(3).....................................     $ .35     $ .43 $ .35 $ .29
  Vectra.......................................       --        --    --    --
  Pro Forma Combined per Zions Common Share....       .35       .43   .35   .29
  Equivalent Pro Forma per Vectra Common Share.       .24       .29   .24   .20
</TABLE>
- --------
(1) Assuming full dilution.
(2) Assuming conversion of Vectra Preferred Stock.
(3) While Zions is not obligated to pay cash dividends, the Board of Directors
    of Zions presently intends to continue its policy of paying quarterly cash
    dividends. Future dividends will depend, in part, upon the earnings and
    financial condition of Zions.
 
                                       18
<PAGE>
 
                                 THE COMPANIES
 
ZIONS
 
  Zions is a bank holding company registered under the BHCA, and organized
under the laws of Utah, engaged primarily in the commercial banking business
through its banking subsidiaries. Zions' principal executive offices are
located at One South Main, Suite 1380, Salt Lake City, Utah 84111 (telephone:
801-524-4787). Zions is the second largest bank holding company headquartered
in Utah. ZFNB, Salt Lake City, Utah, founded in 1873, is a wholly owned
subsidiary of Zions (except for directors' qualifying shares) and as of
September 30, 1997 had 109 offices located throughout the State of Utah, plus
one foreign office. ZFNB is the second largest commercial banking organization
headquartered in the State of Utah. As of September 30, 1997, ZFNB also had 14
offices in Idaho.
 
  Zions also owns Nevada State Bank, Las Vegas, Nevada; NBA, Phoenix, Arizona;
Pitkin, Aspen, Colorado; Valley, Cortez, Colorado; and Centennial, Durango,
Colorado. As of September 30, 1997, Nevada State Bank operated 32 offices in
Nevada and was the fifth largest commercial bank in Nevada, and NBA operated
28 offices in Arizona and was the fifth largest commercial bank in Arizona.
Through Pitkin, Valley and Centennial, Zions operates its commercial banking
and thrift business through 12 branches in western Colorado and one branch in
northwestern New Mexico.
 
  Subsequent to September 30, 1997, ZFNB has opened two branch offices in Utah
and added one de novo office in Idaho. In addition, on October 17, 1997 Zions
acquired Sun State Bank, Las Vegas, Nevada, with 5 branches in Nevada and, on
the same date, merged Sun State Bank into Nevada State Bank. Zions has also
entered into an agreement to acquire The First National Bank in Alamosa in
Alamosa, Colorado, with 3 branches in Colorado. The acquisition is expected to
close in the fourth quarter of 1997. On November 14, 1997, Zions acquired GB
Bancorporation, the principal subsidiary of which, Grossmont Bank, operates 14
branches in San Diego County, California. On September 23, 1997, Zions entered
into an agreement with Tri-State, pursuant to which Tri-State will merge with
and into a subsidiary of Zions; Tri-State Bank, a subsidiary of Tri-State,
operates 1 branch in each of Denver and Boulder, Colorado. Zions will issue an
additional 710,000 shares of Zions Common Stock in connection with the
acquisition of Tri-State. It is currently intended that the acquisition of
Tri-State will be accounted for under the "pooling of interests" method of
accounting.
 
VECTRA
 
  Vectra is the second largest independent Colorado-based bank holding
company, with a total of 16 banking locations serving the Denver/Boulder
metropolitan area. In addition, Vectra expects to open an additional branch
location in December 1997. Through its bank subsidiary, Vectra Bank, Vectra
provides a broad range of banking products and services primarily to consumers
and small to medium sized businesses. The Company was founded in 1988 by two
senior banking executives who, together with a small group of investors,
provided $9.8 million in initial capital to Vectra. Vectra's initial objective
was to acquire several strategically located community banks and transform
them into a banking system that would provide a broad package of products and
services to its customers and growth potential to its shareholders. In 1989,
the Company acquired its initial eight locations having total assets of $156
million. Since that time, Vectra has grown significantly through a combination
of internal growth and acquisitions. At September 30, 1997, Vectra had total
assets of approximately $690 million.
 
 
                                      19
<PAGE>
 
  In November 1995, Vectra completed a merger of FDC, a bank holding company
whose primary operating subsidiary was First National Bank of Denver, into
Vectra. This acquisition added approximately $44 million in deposits and $17
million in loans. In June 1996, Vectra acquired Bank Land Company, a bank
holding company whose primary operating subsidiary was Southwest. This
acquisition added approximately $96 million in deposits and $74 million in
loans. In April 1997, Vectra opened a loan production office in Longmont,
Colorado. In August 1997, Vectra acquired Professional Bank, a Denver based
bank with two locations, loans of $52 million and deposits of $68 million.
Also in August 1997, Vectra opened a branch in Commerce City, Colorado. The
addition of the FDC, Southwest, Professional Bank, Longmont and Commerce City
banking locations has allowed Vectra to serve a broader base of households and
businesses within its market and to achieve growth in assets and revenue
without a proportionate growth in expenses.
 
  Vectra's operating strategy has been to continue to build a growing,
profitable community banking network. The principal elements of this strategy
have been to (i) focus on the financial service needs of consumers and small
to medium sized businesses by combining the elements of service traditionally
found in community banks with product lines typically found in large banks,
(ii) emphasize high quality customer service in all aspects of operations,
(iii) maintain high asset quality and (iv) achieve efficiencies through
centralized administrative and support functions.
 
  The Company's principal executive office is located at 1650 South Colorado
Boulevard, Suite 320, Denver, Colorado 80222 (telephone: (303) 782-7440).
 
ZIONS LOAN TO VECTRA
 
  It is currently expected that Zions will loan Vectra up to $10 million prior
to the Effective Date. Vectra intends to use up to $4,050,000 of the net
proceeds from that loan to repay the NationsBank Loan. Pursuant to the
NationsBank Loan and related agreements, Vectra had pledged all the
outstanding shares of capital stock of Vectra Bank to NationsBank, N.A. In
connection with the loan from Zions, that pledge arrangement will be
terminated and Vectra will pledge the shares of capital stock of Vectra Bank
to Zions. The remainder of the net proceeds from the loan from Zions will be
used for general corporate purposes, including the possible repurchase by
Vectra of shares of Vectra Common Stock prior to the Effective Date.
 
                                      20
<PAGE>
 
                              THE SPECIAL MEETING
 
DATE, TIME AND PLACE
 
  The Special Meeting is scheduled to be held in the lobby of the headquarters
of Vectra, 1650 South Colorado Boulevard, on Monday, December 29, 1997 at 8:00
a.m., local time.
 
  VECTRA SHAREHOLDERS ARE REQUESTED TO PROMPTLY SIGN, DATE AND RETURN THE
ACCOMPANYING PROXY CARD IN THE ENCLOSED POSTAGE-PAID PRE-ADDRESSED ENVELOPE.
FAILURE TO RETURN A PROPERLY EXECUTED PROXY CARD OR TO VOTE AT THE MEETING
WILL HAVE THE SAME EFFECT AS A VOTE AGAINST THE MERGER.
 
MATTERS TO BE CONSIDERED AT THE SPECIAL MEETING
 
  The purposes of the Special Meeting are (a) to consider and vote upon the
approval of the Merger and (b) to transact such other business as may properly
come before the Special Meeting or any adjournments or postponements thereof.
 
  FOR THE REASONS SET FORTH HEREIN, THE VECTRA BOARD HAS, BY UNANIMOUS VOTE,
APPROVED THE MERGER AGREEMENT AND RECOMMENDS A VOTE "FOR" APPROVAL OF THE
MERGER.
 
RECORD DATE; STOCK ENTITLED TO VOTE
 
  Only holders of record of Vectra Stock on the Record Date will be entitled
to receive notice of, and to vote at, the Special Meeting and any
postponements or adjournments thereof.
 
VOTES REQUIRED; QUORUM
 
  The affirmative vote of the holders of at least a majority of the total
number of outstanding shares of Vectra Common Stock entitled to vote at the
Special Meeting and the affirmative vote of the holders of at least a majority
of the total number of shares of Vectra Preferred Stock entitled to vote at
the Special Meeting, each voting as a separate group, are required to approve
the Merger.
 
  As of the Record Date, there were 4,865,692 shares of Vectra Common Stock
and 108,754 shares of Vectra Preferred Stock outstanding. Each holder of
shares of Vectra Stock outstanding on the Record Date will be entitled to one
vote for each share held of record upon each matter properly submitted at the
Special Meeting and any postponement or adjournment thereof. A majority of all
shares of Vectra Common Stock entitled to vote, represented in person or by
proxy, constitutes a quorum with respect to the Vectra Common Stock. A
majority of all shares of Vectra Preferred Stock entitled to vote, represented
in person or by proxy, constitutes a quorum with respect to the Vectra
Preferred Stock. The Vectra Common Stock and the Vectra Preferred Stock
comprise separate voting groups with respect to the matters to be acted upon
at the Special Meeting. Abstentions and broker non-votes are each included in
the determination of the number of shares present; however, they are not
counted as votes in favor of the Merger. THE FAILURE TO VOTE, AN ABSTENTION OR
A BROKER NON-VOTE, THUS, HAS THE SAME EFFECT AS A VOTE AGAINST THE MERGER.
 
  If a quorum is not obtained, or fewer shares of Vectra Common Stock or
Vectra Preferred Stock, as the case may be, are voted in favor of the Merger
than the number required for approval, it is expected that the Special Meeting
will be postponed or adjourned for the purpose of allowing additional time for
obtaining additional proxies or votes, and at any subsequent reconvening of
the Special Meeting, all proxies will be voted in the same manner as such
proxies would have been voted at the original convening of the Special Meeting
(except for any proxies which have theretofore effectively been revoked or
withdrawn).
 
VOTING OF PROXIES
 
  Shares represented by proxies properly executed and received in time to be
voted at the Special Meeting will be voted in accordance with the instructions
indicated on the proxies. Proxies which do not contain voting instructions
will be voted "FOR" the proposal to approve the Merger. All proxies voted
"FOR" such matters,
 
                                      21
<PAGE>
 
including proxies on which no instructions are indicated, may, at the
discretion of the proxy holder, be voted "FOR" a motion to adjourn or postpone
the Special Meeting to another time and/or place for the purpose of soliciting
additional proxies or otherwise; provided, however, that no proxy which is
voted against approval of the Merger or on which the relevant shareholder
specifically abstains from voting with respect to such approval will be voted
in favor of any such adjournment or postponement.
 
  It is not expected that any matters other than as described herein will be
brought before the Special Meeting. If, however, other matters are properly
brought before the Special Meeting, persons appointed as proxies will have
discretion to vote or act thereon in their best judgment.
 
REVOCABILITY OF PROXIES
 
  The presence of a Vectra Shareholder at the Special Meeting (or at any
postponement or adjournment thereof) will not automatically revoke such Vectra
Shareholder's proxy. However, a Vectra Shareholder may revoke a proxy at any
time prior to its exercise by (a) delivery to the Secretary of Vectra of a
written notice of revocation prior to the Special Meeting (or, if the Special
Meeting is adjourned or postponed, prior to the time the adjourned or
postponed meeting is actually held); (b) delivery to the Secretary of Vectra
of a duly executed proxy bearing a later date prior to the Special Meeting
(or, if the Special Meeting is adjourned or postponed, prior to the time the
adjourned or postponed meeting is actually held); or (c) attending the Special
Meeting (or, if the Special Meeting is adjourned or postponed, by attending
the adjourned or postponed meeting) and voting in person. Any written
revocation of proxy or other related communications should be addressed to Ray
L. Nash, Secretary, Vectra Banking Corporation, 1650 South Colorado Boulevard,
Suite 320, Denver, Colorado 80222.
 
SOLICITATION OF PROXIES
 
  In addition to solicitation by mail, directors, officers and employees of
Vectra may solicit proxies from Vectra Shareholders personally or by telephone
or other means without additional remuneration therefor. Vectra will also
provide persons, firms, banks and corporations holding shares in their names
or in the names of nominees, which in any case are beneficially owned by
others, with proxy materials for transmittal to such beneficial owners and
will reimburse such record owners for their expenses in doing so. Vectra will
bear the cost of solicitation of proxies from Vectra Shareholders.
 
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
  As of the Record Date, the directors and officers of Vectra beneficially
held, in the aggregate, the ability to direct the voting with respect to
886,795 shares of Vectra Common Stock, comprising approximately 17.9% of the
voting power of the Vectra Common Stock outstanding on the Record Date. In
addition, pursuant to the Shareholder Agreements, all of the directors and one
non-director executive officer of Vectra, in their capacity as shareholders,
together holding or controlling an aggregate of 845,150 shares of Vectra
Common Stock (or approximately 17.4% of the shares of Vectra Common Stock
outstanding on the Record Date), and 31,709 shares of Vectra Preferred Stock
(or approximately 28.6% of the shares of Vectra Preferred Stock outstanding on
the Record Date) have agreed to vote their shares in favor of the Merger. See
"The Shareholder Agreements."
 
                                      22
<PAGE>
 
                                  THE MERGER
 
  This section of the Proxy Statement-Prospectus describes certain aspects of
the proposed Merger, and such information is qualified in its entirety by
reference to the other information contained elsewhere in this Proxy
Statement-Prospectus, including the Appendices hereto, and the documents
incorporated herein by reference. A copy of the Merger Agreement is set forth
as Appendix A to this Proxy Statement-Prospectus, and the text thereof is
incorporated herein by reference; reference is made thereto for a complete
description of the terms of the Merger. Vectra Shareholders are urged to read
carefully the Merger Agreement and each of the other Appendices hereto in
their entirety.
 
BACKGROUND OF THE MERGER
 
  Merger activity among financial institutions has continued at a heightened
level during the past several years. From time to time during this period,
Vectra was approached informally by various parties to see if it would
consider a business combination. No substantive discussions resulted from
these approaches and Vectra continued its strategy of enhancing shareholder
value through internal growth and acquisitions of other financial
institutions, including its acquisitions of First Denver Corporation in
November 1995, Southwest State Bank in June 1996, and Professional Bank in
August 1997.
 
  During the fourth quarter of 1996, Zions entered into a definitive agreement
to acquire Aspen Bancshares, Inc. ("Aspen"), a bank holding company with
operations in Colorado. The business combination with Aspen, which marked
Zions' first commercial banking entry into Colorado, was consummated in May
1997. A principal shareholder of Aspen, who is also a significant shareholder
of Vectra, met with Mr. Harris H. Simmons, the Chief Executive Officer of
Zions, on more than one occasion prior to the closing of the Aspen transaction
and, during their visits, they discussed the future plans of Zions in the
Colorado market, including Zions' desire to increase its presence in the
market. In discussing the need for an experienced management team to manage
the growing operations in Colorado, the shareholder suggested that Mr. Simmons
meet with Mr. Gary S. Judd, Chief Executive Officer of Vectra. Mr. Judd agreed
to meet with Mr. Simmons.
 
  Mr. Simmons called Mr. Judd in late March 1997, and they met in Denver,
Colorado on March 28, 1997, and discussed, among other things, trends in the
financial services industry and in very general terms the potential benefits
of a possible combination of their respective organizations. Mr. Simmons
subsequently invited Mr. Judd to visit him in Salt Lake City, Utah and Mr.
Judd did so on May 27, 1997, in connection with other business. Messrs.
Simmons and Judd, at this second meeting, again discussed in generalities a
possible combination of their respective organizations but, again, no
substantive discussions took place and no offers or other proposals were made.
 
  Within several weeks after his visit to Salt Lake City, Mr. Judd and
Vectra's Chief Financial Officer, in preparation for a meeting with the Vectra
Board, began an in-depth evaluation of the various strategic alternatives
available to Vectra to enhance shareholder value and to determine, generally,
whether the short-term and long-term interests of Vectra Shareholders would
best be served by the continued independence of Vectra or through a business
combination with a larger, more geographically diversified and technologically
advanced financial institution. The evaluation focused on certain factors
regarding Vectra and its current and future prospects, financial measures and
performance, and technological capabilities and requirements. The evaluation
also included a general analysis regarding the nine financial institutions,
one of which was Zions, that they considered likely to be interested in
acquiring Vectra (based upon, among other things, the total amount each
potential acquiror could afford to pay for Vectra under various assumptions).
 
  It was noted, as part of the evaluation process, that smaller and mid-sized
banking organizations such as Vectra were adversely affected by the high cost
of technology required to stay competitive with larger, more cost efficient
competitors--including large, experienced, non-bank financial service
providers, many of which enjoy the benefits of advanced technology, fewer
regulatory constraints and lower cost structures. It was determined that
Vectra would require significant additional investments in technology in the
near future and that
 
                                      23
<PAGE>
 
such additional investments may have little or no value to a future acquiror.
The evaluation process also considered the relatively high recent stock prices
of potential acquirors, Vectra's current strong credit quality and earnings,
and the perceived need to offer new products such as investments and insurance
products to remain competitive in the market, and the effort, expense and
opportunity costs associated with the introduction of new products.
 
  On July 1, 1997, the Vectra Board met with representatives of Wallach who
had also been advisors to Aspen in its transaction with Zions, who gave a
general presentation regarding merger and acquisition activity in Colorado and
discussed in detail the final terms and value of Zions' acquisition of Aspen.
His analysis of the stock valuations for the leading regional banks active in
Colorado showed significant increases from earlier in the year. The Vectra
Board discussed, in some detail, various valuation methodologies, current
Vectra stock multiples, future Vectra earnings estimates, and the analysis
prepared by senior management referred to above. The Vectra Board agreed to
continue the discussion at a meeting scheduled for July 24, 1997.
 
  During the first few weeks in July 1997, Messrs. Judd and Simmons had an
informal telephone conversation regarding their respective operations and
continued to discuss, in very general and preliminary terms, Zions' interest
in a combination of their respective organizations. No substantive discussions
took place and no offers or other proposals were made during this
conversation.
 
  On July 24, 1997, the Vectra Board reviewed the strategic alternatives
available to Vectra and discussed the recent informal and preliminary
discussions between Messrs. Judd and Simmons. At the meeting, the Vectra Board
approved the retention of special legal counsel, Lewis, Rice & Fingersh, L.C.,
to represent Vectra in the event it should determine to pursue a business
combination with a third party. Representatives of the law firm were present
at the meeting and reviewed with the Vectra Board its legal responsibilities
when considering sales and other strategic alternatives. The Vectra Board also
determined to retain Wallach to advise it in connection with any future
transaction with a third party. The Vectra Board then reviewed an update of
the information previously prepared by senior management that was originally
presented at the meeting on July 1, 1997. The Vectra Board concluded that
Zions appeared to be the most appropriate merger partner in the event that
such a transaction were to be pursued. The Vectra Board then discussed whether
to continue the corporation's present independent course or to explore seeking
a sale or merger transaction with a larger institution. It was determined that
a decision as to whether to remain independent could only be made in the
context of a careful consideration of all options, so Mr. Judd was encouraged
to meet with Zions and report back to the Vectra Board as appropriate.
 
  On July 29, 1997, Mr. Judd and Mr. W. James Tozer, Jr., a Director of Vectra
and its largest private shareholder, met with Mr. Simmons in Salt Lake City,
Utah. A confidentiality agreement was executed and Mr. Judd provided Mr.
Simmons with certain information regarding Vectra, including some of the
financial analyses of a possible transaction previously prepared by Vectra
senior management. The parties discussed a possible business combination
transaction and the range of pricing Vectra would need if a proposal were to
be forthcoming. The parties determined to talk again later in August.
 
  On August 19, 1997, Mr. Judd telephoned Mr. Simmons and Mr. Simmons
expressed Zions' interest in pursuing a business combination with Vectra. Mr.
Simmons asked Mr. Judd to telephone him again on August 20, 1997, before the
Vectra Board meeting to discuss Zions' interest further. They spoke in general
terms regarding a purchase price and Mr. Simmons indicated that, subject to
discussions with the Zions Board, an exchange of 4.3 million shares of Zions
Common Stock in a transaction with Vectra could be possible.
 
  Mr. Judd then discussed his conversation with Mr. Simmons and the July 29,
1997, contact with Zions at a meeting of the Vectra Board on August 20, 1997.
Also present at the meeting were representatives of Wallach. The Wallach
representatives discussed, among other things, certain material Wallach had
prepared to support the negotiations with Zions and confirmed Vectra's
analysis that Zions appeared to be in the best position to offer an attractive
price for the Vectra franchise. The Vectra Board determined that Mr. Judd
should continue his discussions with representatives of Zions, based upon the
possible exchange of 4.3 million shares of Zions Common Stock in a transaction
with Vectra, and also suggested that any possible transaction include a
"floor"
 
                                      24
<PAGE>
 
provision whereby the exchange ratio would adjust in the event that the Zions
Common Stock price should decline by more than certain parameters.
 
  Mr. Judd met with Mr. Simmons in Denver, Colorado on August 22, 1997 to
update Mr. Simmons on the reaction of the Vectra Board to the possibility of a
business combination with Zions. Messrs. Judd and Simmons discussed a possible
structure involving the exchange of 4.3 million shares of Zions Common Stock
in a business combination with Vectra, subject, however, to the approval of
the Vectra and Zions Boards, and also discussed the "floor" provision
suggested by the Vectra Board.
 
  The Vectra Board authorized the continuation of discussions with Zions using
an exchange ratio of 0.685 of a share of Zions Common Stock for each share of
Vectra Common Stock. During the first week of September, 1997, Zions and
Vectra and their respective advisors began the preparation and negotiation of
the definitive documentation for the proposed transaction and discussed due
diligence reviews of the business and financial condition of the other, which
began on September 9, 1997.
 
  Negotiations continued and, on September 19, 1997, a special meeting of the
Vectra Board was held to consider the proposed transaction with Zions. The
Vectra Board reviewed in detail with Vectra's legal advisors the terms of the
Merger and the proposed Merger Agreement, including the Stock Option
Agreement, the Employment Agreement with Mr. Judd and the agreements of the
Directors and one non-director executive officer to vote in favor of the
Merger. See "The Merger Agreement," "The Stock Option Agreement," and "The
Shareholder Agreements." The Vectra Board also discussed the results of the
due diligence review of Zions conducted by senior management of Vectra.
Wallach then rendered its opinion that the Merger Consideration to be received
in the Merger by holders of Vectra Stock was fair to such holders. The Vectra
Board, with one director absent, then unanimously approved the Merger
Agreement and the Stock Option Agreement and the other agreements described in
this Proxy Statement-Prospectus as being in the best interests of Vectra, its
shareholders and other constituencies.
 
  On September 2, 1997, a special meeting of the Zions Board was held to
consider the proposed transaction with Vectra. After a comprehensive
discussion of the terms of the proposed Merger including the Common Conversion
Number and the terms of the merger agreement and other agreements to be
drafted by Zions' special counsel, and subject to the completion by management
of due diligence with respect to Vectra and the preparation and finalization
of the definitive agreements under the supervision of Zions' management, the
Zions Board, with one director absent, unanimously approved the Merger and the
transactions contemplated thereby as being in the best interests of Zions and
its shareholders. On September 23, 1997, Zions' management approved the form
of definitive agreements.
 
  On September 23, 1997, the Merger Agreement, the Stock Option Agreement and
the other agreements described in this Proxy Statement-Prospectus were
executed by Zions and Vectra and the other parties thereto, and the proposed
Merger transaction was publicly announced before the market opened on
September 24, 1997.
 
EFFECT OF MERGER
 
  At the Effective Time, Vectra will merge with and into Zions, and Zions will
be the Surviving Corporation in the Merger and will continue its corporate
existence under Utah law. The separate corporate existence of Vectra will then
cease.
 
  Upon the Merger becoming effective, (a) each share of Vectra Common Stock
issued and outstanding at the Effective Time (other than Treasury Stock) will
be converted automatically into the right to receive 0.685 of a share of Zions
Common Stock, with any rights attached thereto under or by virtue of the Zions
Rights Plan, and (b) each share of Vectra Preferred Stock issued and
outstanding at the Effective Time (other than (i) Treasury Stock and (ii)
shares which have not been voted in favor of the approval of the Merger and
with respect to which Dissenters' Rights shall have been perfected in
accordance with the CBCA) will be converted automatically into the right to
receive 7.755 shares of Zions Common Stock, with any rights attached thereto
under or by virtue of the Zions Rights Plan. Each of the Common Conversion
Number and the Preferred Conversion Number is subject to upward (but not
downward) adjustment under certain circumstances, as described herein. See
"The Merger Agreement--Termination; Conversion Number Adjustment."
 
                                      25
<PAGE>
 
REASONS FOR THE MERGER; RECOMMENDATION OF THE BOARD OF DIRECTORS
 
 Zions
 
  The Board of Directors of Zions has unanimously approved the Merger
Agreement and has determined that the Merger and the issuance of the Zions
Common Stock pursuant thereto are fair to, and in the best interests of, the
shareholders of Zions. The approval of the Merger Agreement by the
shareholders of Zions is not required.
 
 Vectra
 
  The Vectra Board has unanimously approved the Merger Agreement and the
transactions contemplated thereby and has determined that the Merger is fair
to, and in the best interests of, Vectra and the Vectra Shareholders. As a
consequence, the Vectra Board unanimously recommends that the Vectra
Shareholders vote to approve the Merger Agreement. The Vectra Board believes
that the Merger will enable holders of Vectra Stock to realize both increased
value and liquidity. The Vectra Board also believes that this business
combination will provide additional opportunities for the continued growth of
Vectra Bank, expansion of its services to its customers and expansion of
opportunities for its employees. In considering its decision to approve the
Merger Agreement, the Vectra Board consulted with its outside counsel
regarding the legal terms of the Merger and the Vectra Board's fiduciary
obligations in its consideration of the proposed Merger. The Vectra Board also
consulted with its financial advisor, Wallach, regarding the financial aspects
and fairness of the proposed Merger.
 
  In reaching its determination to approve the terms of the Merger, the Vectra
Board considered the following material factors from both a short-term and
long-term perspective:
 
    (i) Financial and Other Terms. The Vectra Board considered the terms of
  the Merger Agreement and the transactions contemplated thereby, including
  the Stock Option Agreement. The Vectra Board took into account the
  historical trading ranges for Vectra's Common Stock and Zions Common Stock,
  the Common Conversion Number and the Preferred Conversion Number (noting,
  in particular, that such consideration reflected a 13.5% premium for the
  shareholders of Vectra and which would result in a purchase price
  equivalent to a multiple of Vectra June 30, 1997 book value as described
  below under "--Opinion of Financial Advisor"), the potential impact of the
  Merger on the price of Zions Common Stock over the short- and medium-term,
  and the amount of the Merger consideration in comparison to other Zions'
  acquisitions as well as recent comparably sized transactions. The Vectra
  Board also noted that its outstanding series of Vectra Preferred Stock
  would be exchanged for Zions Common Stock based upon an exchange ratio that
  took into account the Common Conversion Number and the current conversion
  terms for the Vectra Preferred Stock. The Vectra Board considered that
  under the Merger Agreement it would have the right to terminate the Merger
  Agreement in the event of a specified significant decline in the price of
  Zions Common Stock prior to the consummation of the Merger unless Zions
  then elected to increase the Common Conversion Number and the Preferred
  Conversion Number in the manner specified in the Merger Agreement. With
  respect to the Stock Option Agreement, the Vectra Board was aware that the
  existence of such agreement might discourage third parties from seeking to
  acquire Vectra, and might also preclude any third party from being able to
  effect a merger with Vectra that would qualify for pooling of interests
  accounting treatment. See "The Merger Agreement--Termination; Conversion
  Number Adjustment" and "The Stock Option Agreement."
 
    (ii) Advice of Financial Advisor and Fairness Opinion. The Vectra Board
  considered the advice of its financial advisor, Wallach, and reviewed the
  detailed financial analyses and other information presented by Wallach. The
  Vectra Board considered the opinion of Wallach (including the assumptions
  and financial information and projections relied upon by them in arriving
  at such opinion) that, as of September 23, 1997 and based upon the matters
  set forth in its written opinion as of that date, the Merger Consideration
  was fair to the holders of Vectra Stock from a financial point of view. The
  Vectra Board also took into account the advice of Wallach that the
  multiples of earnings and book value represented by the Common Conversion
  Number and the Preferred Conversion Number were among the highest observed
  in recent mergers of bank holding companies. For a discussion of the
  opinion of Wallach, including a summary of the procedures
 
                                      26
<PAGE>
 
  followed, the matters considered, the scope of the review undertaken, and
  the assumptions made with respect thereto, see "--Opinion of Financial
  Advisor."
 
    (iii) Opportunity for Increased Revenue and Cost Savings. The Vectra
  Board considered the opportunity for revenue enhancement by offering Zions'
  extensive array of commercial and consumer products through Vectra's branch
  network. The Vectra Board took into account the expectation that the Merger
  would result in economies of scale and cost synergies.
 
    (iv) Increased Resources and Market Presence. The Vectra Board considered
  that Vectra Bank would be combined with Zions' other recent bank
  acquisitions in Colorado to create a Colorado based banking operation with
  approximately $1.4 billion in total assets. The Vectra Board also
  considered that the combined organization would have total assets of
  approximately $10 billion and operations in Utah, Nevada, Arizona, Idaho,
  California, Colorado and New Mexico, thus greatly increasing Vectra's
  geographic diversity. The Vectra Board recognized that such an institution
  would be likely to possess the financial resources to compete more
  effectively in the rapidly changing marketplace for banking and financial
  services and would be effective in fulfilling Vectra's long-term objective
  of increasing its overall size and enhancing its market presence, while
  maintaining its asset quality and credit standards. The Vectra Board also
  considered the substantial technological capabilities of Zions and its
  ability to provide improved products and services to Vectra's customers,
  and the likelihood that such capabilities and ability would enhance the
  ability of the combined company to compete in the future with other banks
  and non-banking providers of financial services.
 
    (v) Continuity of Management. The Vectra Board considered that current
  Vectra Bank management would be expected to play a continuing role in the
  combined entity and the Employment Agreement that would be entered into
  with Gary S. Judd, Chief Executive Officer of Vectra and Vectra Bank. See
  "The Merger--Interests of Certain Persons in the Merger."
 
    (vi) Impact on Vectra Constituencies. The Vectra Board considered the
  general impact the Merger would have on the various constituencies served
  by Vectra, including its customers, employees, and others. The Vectra Board
  took into account that the combined entity would be able to offer a more
  extensive range of products and banking services.
 
    (vii) Due Diligence Review. The Vectra Board considered the results of
  the due diligence investigations conducted by Vectra senior management,
  including, among other things, assessments of Zions' credit policies, asset
  quality, adequacy of loan loss reserves, and interest rate risk.
 
    (viii) Tax and Accounting Treatment. The Vectra Board considered that the
  Merger is expected to be tax-free (other than with respect to cash paid in
  lieu of fractional shares and with respect to holders of Vectra Preferred
  Stock who exercise Dissenters' Rights under the CBCA) to Vectra
  Shareholders for federal income tax purposes and to be accounted for under
  the pooling of interests method of accounting for business combinations.
  See "--Certain Federal Income Tax Consequences" and "--Accounting
  Treatment."
 
    (ix) Regulatory Approvals. The Vectra Board considered the nature of, and
  likelihood of obtaining, the regulatory approvals that would be required
  with respect to the Merger. See "--Regulatory Approvals."
 
    (x) Economic and Competitive Environment. The Vectra Board took into
  account the current and prospective economic and competitive environment
  facing the financial services industry generally and each institution in
  particular.
 
    (xi) Alternatives to the Merger Agreement. The Vectra Board considered
  the effect on shareholder value of Vectra continuing as a stand-alone
  entity or combining with other potential merger partners, compared to the
  effect of its combining with Zions pursuant to the proposed Merger
  Agreement, and determined that the merger with Zions presented the best
  opportunity for maximizing shareholder value and achieving Vectra's other
  strategic objectives.
 
                                      27
<PAGE>
 
  The foregoing discussion of the information and factors considered by the
Vectra Board is not intended to be exhaustive, but constitutes the material
factors considered by the Vectra Board. In reaching its determination to
approve and recommend the Merger, the Vectra Board did not assign relative or
specific weights to the foregoing factors and individual directors may have
weighed such factors differently.
 
  FOR THE REASONS SET FORTH ABOVE, THE VECTRA BOARD HAS UNANIMOUSLY APPROVED
THE MERGER AS FAIR TO AND IN THE BEST INTERESTS OF VECTRA AND THE VECTRA
SHAREHOLDERS AND UNANIMOUSLY RECOMMENDS THAT VECTRA SHAREHOLDERS VOTE FOR THE
APPROVAL OF THE MERGER.
 
OPINION OF FINANCIAL ADVISOR
 
  Vectra has received an opinion from Wallach that, as of the date of this
Proxy Statement-Prospectus, the Merger Consideration is fair to the holders of
Vectra Stock from a financial point of view. The full text of Wallach's
opinion dated as of the date of this Proxy Statement-Prospectus, which sets
forth matters considered in connection with such opinion, is attached hereto
as Appendix C and should be read in its entirety by Vectra Shareholders. This
summary of the opinion is qualified in its entirety by reference to the full
text of the opinion.
 
  The Vectra Board retained Wallach as its financial advisor on the basis of
the firm's experience and expertise with the financial services and banking
industry and with transactions similar to the Merger.
 
  In connection with delivering its fairness opinion, Wallach, among other
things, did the following:
 
    (i) reviewed certain publicly available financial statements and other
  financial information not publicly available for Vectra;
 
    (ii) reviewed the current condition and growth prospects for Vectra and
  its subsidiary operations, including financial projections prepared by
  Vectra's management;
 
    (iii) discussed the past and current operations and financial conditions
  and the prospects of Vectra with Vectra's management;
 
    (iv) reviewed Vectra's historical stock trading activity and considered
  the prospect for value, liquidity, dividend yield and growth if Vectra were
  to remain independent;
 
    (v) evaluated the economic, banking and competitive climate for banking
  institutions in Colorado, with special consideration given to recent
  transactions that may have increased the competitive environment in the
  financial services and banking industry;
 
    (vi) compared the Zions offer to recent transactions involving other
  institutions of similar size, to the extent publicly available;
 
    (vii) examined the price and trading activity for Zions;
 
    (viii) reviewed the implications for Vectra Shareholders receiving Zions
  Common Stock with regards to prospects for value, liquidity, dividend yield
  and growth;
 
    (ix) met with Zions' management and reviewed certain publicly available
  financial statements of Zions; and
 
    (x) reviewed the Merger Agreement.
 
  Neither Zions nor Vectra imposed any limitations upon the scope of the
investigation performed by Wallach in formulating its opinion. In rendering
its opinion, Wallach did not independently verify the asset quality and
financial condition of Zions or Vectra, but instead relied upon the data
provided by or on behalf of Zions and Vectra to be true and accurate in all
material respects.
 
                                      28
<PAGE>
 
  Wallach relied without independent verification upon the accuracy and
completeness of all the financial and other information reviewed by it for
purposes of the fairness opinion. The fairness opinion is necessarily based on
information as of the date thereof. The fairness opinion is directed only to
the consideration to be received by Vectra Shareholders for their shares of
Vectra Stock if the Merger is consummated and does not constitute a
recommendation to any Vectra Shareholder as to how such shareholder should
vote at the Special Meeting.
 
  Following is a brief summary of the material analyses utilized by Wallach in
arriving at its fairness opinion. This summary does not purport to be a
complete description of the analyses performed by Wallach.
 
  Implied Zions Offer Price. The closing stock price of Zions was $40.00 on
September 19, 1997, the date for which the Vectra Board evaluated Zions' final
proposal. Based on the Common Conversion Number of 0.685, the resulting Zions
offer price for each share of Vectra Common Stock was $27.40. The implied
multiple of trailing 12-month earnings of Vectra for the year ended June 30,
1997, was 27.1. The implied multiple of book value at June 30, 1997, was
412.7%.
 
  Analysis of Selected Bank Mergers. Wallach also reviewed publicly available
information on nine national bank merger and acquisition transactions known by
Wallach to have occurred since January 1, 1997, for which Wallach believed the
sellers were similar to Vectra in size, market and financial performance.
Wallach compared certain percentages and multiples implied by the Zions offer
with comparable percentages and multiples for these transactions. The average
price offered in these transactions as a multiple of trailing earnings was
20.2 as compared to 27.1 associated with the Zions offer at the time of the
September 19 Vectra Board meeting. Since several of the acquired companies had
higher capital levels than Vectra, Wallach chose to use the adjusted capital
method when comparing price to book value ratios. The adjusted capital method
adjusts the banks capital level to a normalized level of 7.5% of assets, under
the assumption that an acquirer will not assign a multiple of value for excess
capital. The average multiple of adjusted book value in these transactions was
271.6%, as compared to 412.7% associated with the Zions offer at the time of
the September 19 Vectra Board meeting.
 
  Wallach is not aware of any merger or acquisition transactions involving the
sale of commercial banks which it believes are comparable to Vectra and for
which information is publicly available since September 19, 1997.
 
  Zions Common Stock Trading History and Valuation. Wallach examined the
history of trading prices for Zions compared to a select group of eight other
large regional bank holding companies who are active in acquisitions in the
Rocky Mountain region. The "Index Group" is comprised of Banc One Corporation,
Community First Bankshares, First Security Corporation, KeyCorp, Norwest
Corporation, TCF Financial Corporation, US Bancorp and Wells Fargo & Co.
Wallach also examined the valuation of Zions relative to the Index Group in
relation to earnings, book value, dividend yield and other factors. For
projected earnings Wallach used the average of published analyst estimates.
The analysis showed, among other things, that for the trailing 12-month period
ended June 30, 1997, and projected 1997 and 1998 calendar years, based on
stock prices at September 19, 1997, the price to earnings ratio for Zions was
22.2, 21.1 and 18.2 respectively, compared to 21.4, 18.1 and 15.2 for the
Index Group, respectively. Based on Zions stock price on September 19, 1997,
the price to book value for Zions was 407% compared to 320% for the Index
Group and the common dividend yield for Zions was 1.2% compared to 2.1% for
the Index Group. As of September 19, 1997, the consensus of research analysts'
projections of five years' earnings growth rate was 13% for Zions compared to
12.2% for the Index Group. The return on average equity for the six months
ended June 30, 1997, was 24.7% for Zions compared to 18.5% for the Index
Group. The ratio of equity to assets for Zions was 7.3% compared to 8.6% for
the Index Group.
 
  Subsequent Zions Offer Price. The closing stock price of Zions was $41.125
on September 23, 1997, the date of Wallach's initial fairness opinion. Based
on the Common Conversion Number of 0.685, the resulting Zions offer price for
each share of Vectra Common Stock was $28.17. The implied multiple of trailing
12-month earnings of Vectra for the year ended June 30, 1997, was 27.9. The
implied multiple of book value at June 30, 1997, was 424.3%.
 
                                      29
<PAGE>
 
  Recent Zions Offer Price. Based on the closing price of Zions Common Stock
on November 18, 1997, of $39.75 and the Common Conversion Number of 0.685, the
resulting exchange offer price for Vectra was $27.23. The implied multiple of
trailing 12-month earnings for the period ended June 30, 1997, was 27.0. The
implied multiple of book value per share at June 30, 1997 was 410.1%.
 
  Wallach is of the opinion that the Merger Consideration is fair to Vectra
Shareholders from a financial point of view.
 
  Wallach believes that its analyses and the summary set forth above must be
considered as a whole and that selecting portions of its analyses and the
factors considered by them could create an incomplete view of the process
underlying the preparation of its fairness opinion. No company or transaction
used in the company comparable transaction analysis is identical to Vectra,
Zions or the Merger. Accordingly, in its analysis Wallach used complex
considerations and judgments concerning differences in financial and operating
characteristics of the companies and other factors that could affect the
public trading value or the acquisition value of the companies to which they
are being compared.
 
  For Wallach's services in connection with rendering its opinion as to the
fairness of the Merger to Vectra's Shareholders from a financial point of view
and for certain other advisory services in connection therewith, Vectra has
agreed to pay Wallach certain fees. Wallach will receive a cash fee for
advisory and other services of the following: (i) $50,000 payable upon the
signing of a purchase agreement, plus (ii) 1% of the excess in the acquisition
price per share of Vectra (at the time the Merger was announced) over $23 per
share, times the fully diluted shares outstanding payable at the Effective
Date, plus (iii) $150,000 for the issuance of a fairness opinion payable at
the Effective Date. Wallach has also received reimbursement of its actual out-
of-pocket expenses and Vectra has agreed to indemnify Wallach against certain
liabilities, including liabilities under securities laws.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
  The following summary of the material federal income tax consequences of the
Merger to holders who hold shares of Vectra Stock as capital assets deals only
with holders who are (i) citizens or residents of the United States, (ii)
domestic corporations or (iii) otherwise subject to United States federal
income tax on a net income basis in respect of shares of Vectra Stock ("U.S.
Holders"). This summary may not apply to certain classes of taxpayers,
including, without limitation, insurance companies, tax-exempt organizations,
financial institutions, dealers in securities, persons who acquired or acquire
shares of Vectra Stock pursuant to the exercise of employee stock options or
otherwise as compensation and persons who hold shares of Vectra Stock in a
hedging transaction or as part of a straddle or conversion transaction. Also,
the summary does not address state, local or foreign tax consequences of the
Merger. Consequently, each holder should consult such holder's own tax adviser
as to the specific tax consequences of the Merger to such holder.
 
  This summary is based on current law and represents the opinion of Sullivan
& Cromwell, special counsel to Zions, and the opinion of Lewis, Rice &
Fingersh, L.C., special counsel to Vectra. Future legislative, judicial or
administrative changes or interpretations, which may be retroactive, could
alter or modify the statements set forth herein. This summary is based on,
among other things, assumptions relating to certain facts and circumstances
of, and the intentions of the parties to, the Merger, which assumptions have
been made with the consent of Zions. Zions does not intend to request any
ruling from the Internal Revenue Service as to the United States federal
income tax consequences of the Merger.
 
  It is intended that the Merger would be treated as a reorganization within
the meaning of Section 368(a) of the Code, and that, accordingly, for federal
income tax purposes no gain or loss would be recognized by either Vectra or
Zions as a result of the Merger.
 
  Zions' obligation to consummate the Merger is conditioned upon, among other
things, the receipt of an opinion of Sullivan & Cromwell, dated the Effective
Date, to the effect that the Merger constitutes a "reorganization" under
Section 368 of the Code. Vectra's obligation to consummate the Merger is
conditioned
 
                                      30
<PAGE>
 
upon, among other things, the receipt of an opinion of Lewis, Rice & Fingersh,
L.C., dated the Effective Date, to the effect that (i) the Merger constitutes
a "reorganization" within the meaning of Section 368 of the Code and (ii) no
gain or loss will be recognized by Vectra Shareholders who receive shares of
Zions Common Stock in exchange for shares of Vectra Stock, except with respect
to cash received in lieu of fractional share interests and, in the case of the
Vectra Preferred Shareholders, with respect to cash received upon the exercise
of Dissenters' Rights. Such opinions will be based upon facts, representations
and assumptions set forth therein. In rendering such opinions, counsel may
require and rely upon representations contained in letters to be received from
Vectra, Zions and certain Vectra Shareholders.
 
  Assuming the Merger qualifies as a "reorganization" within the meaning of
Section 368(a) of the Code, the material federal income tax consequences of
the Merger to each of Zions, Vectra and U.S. Holders who exchange shares of
Vectra Stock for shares of Zions Common Stock pursuant to the Merger will be
as follows:
 
    (i) no gain or loss will be recognized by Zions or Vectra as a result of
  the consummation of the Merger;
 
    (ii) no gain or loss will be recognized by a U.S. Holder, except as
  described below with respect to a U.S. Holder who receives cash either in
  lieu of a fractional share interest in Zions Common Stock or, in the case
  of U.S. Holders who are Vectra Preferred Shareholders, upon the exercise of
  Dissenters' Rights;
 
    (iii) the aggregate adjusted tax basis of shares of Zions Common Stock
  (including a fractional share interest in Zions Common Stock deemed
  received and redeemed as described below) received by a U.S. Holder will be
  the same as the aggregate adjusted tax basis of the shares of Vectra Stock
  exchanged therefor;
 
    (iv) the holding period of shares of Zions Common Stock (including a
  fractional share interest in Zions Common Stock deemed received and
  redeemed as described below) received by a U.S. Holder will include the
  holding period of the Vectra Stock exchanged therefor; and
 
    (v) a U.S. Holder of Vectra Stock who receives cash in lieu of a
  fractional share interest in Zions Common Stock will be treated as having
  received such fractional share interest and then as having received the
  cash in redemption of such fractional share interest. Accordingly, a U.S.
  Holder will generally recognize capital gain or loss equal to the
  difference between the amount of cash received and the U.S. Holder's
  adjusted tax basis in the fractional share interest (determined as
  described in (iii) above, unless the cash received is considered
  "essentially equivalent to a dividend" within the meaning of Section 302 of
  the Code). Such capital gain or loss will be long-term capital gain or loss
  if the U.S. Holder's holding period in the fractional share interest
  (determined as described in (iv) above) is more than one year. Long-term
  capital gain of an individual U.S. Holder is subject to a maximum tax rate
  of 28% in respect of property held for more than one year. The maximum rate
  is reduced to 20% for property held for more than 18 months.
 
  Vectra Preferred Shareholders who exercise their Dissenters' Rights and who
receive cash in exchange for their respective shares will be treated as having
received such payment in redemption of such shares. In general, if such shares
are held as a capital asset at the Effective Time and no other Vectra Stock is
constructively owned, the holder will recognize capital gain or loss measured
by the difference between the amount of cash received and the holder's
adjusted tax basis for the shares. If, however, the holder owns, either
actually or constructively, any Vectra Stock that is exchanged in the Merger
for Zions Common Stock, the payment for dissenting shares to such holder
could, in certain circumstances, be treated as dividend income. In general,
under the constructive ownership rules of the Code, a holder may be considered
to own stock that is owned, and in some cases constructively owned, by certain
related individuals or entities, as well as stock that the holder (or related
individuals or entities) has the right to acquire by exercising an option or
converting a convertible security. Each holder who contemplates exercising
Dissenters' Rights should consult such holder's own tax advisor as to the
possibility that any payment to such holder will be treated as dividend
income.
 
  Under the terms of the Merger Agreement, the conditions to the Merger,
including receipt by each party of opinions of counsel relating to tax
matters, may generally be waived by Zions or Vectra, as applicable. As of the
 
                                      31
<PAGE>
 
date of this Proxy Statement-Prospectus, neither Zions nor Vectra intends to
waive the conditions as to the receipt of opinions of counsel on tax matters.
In the event of a failure to obtain tax opinions, and a party's determination
to waive such condition to the consummation of the Merger, Vectra will
resolicit the votes of its shareholders to approve the Merger without such
conditions and update the information contained herein with respect to the tax
consequences of the Merger as necessary. See "The Merger Agreement--
Conditions," "--Waiver and Amendment" and "--Termination; Conversion Number
Adjustment."
 
  BECAUSE CERTAIN TAX CONSEQUENCES OF THE MERGER MAY VARY DEPENDING UPON THE
PARTICULAR CIRCUMSTANCES OF EACH HOLDER OF VECTRA STOCK AND OTHER FACTORS,
EACH SUCH HOLDER IS URGED TO CONSULT SUCH HOLDER'S OWN TAX ADVISER AS TO THE
SPECIFIC TAX CONSEQUENCES OF THE MERGER TO SUCH HOLDER (INCLUDING THE
APPLICATION AND EFFECT OF STATE AND LOCAL INCOME AND OTHER TAX LAWS).
 
REGULATORY APPROVALS
 
 Federal Reserve Board Approval
 
  The Merger is subject to prior approval by the Federal Reserve Board under
Section 3 of the BHCA, which requires that the Federal Reserve Board take into
consideration, among other things, competition, the financial and managerial
resources and future prospects of the holding companies and banks concerned
and the convenience and needs of the communities to be served. The BHCA
prohibits the Federal Reserve Board from approving the Merger if (a) it would
result in a monopoly or would be in furtherance of any combination or
conspiracy to monopolize or attempt to monopolize the business of banking in
any part of the United States; or (b) its effect in any section of the country
may be substantially to lessen competition or tend to create a monopoly, or if
it would in any other manner be in restraint of trade, unless the Federal
Reserve Board finds that the anti-competitive effects of the Merger are
clearly outweighed in the public interest by the probable effect of the
transaction in meeting the convenience and needs of the communities to be
served. The Federal Reserve Board has the authority to deny an application if
it concludes that the combined organization would have an inadequate capital
structure, taking into account, among other factors, the nature of the
business and operations and plans for expansion. Furthermore, the Federal
Reserve Board must also assess the records of the depository institution
subsidiaries of Zions and Vectra under the Community Reinvestment Act of 1977,
as amended (the "CRA"). The CRA requires that the Federal Reserve Board
evaluate, when evaluating an application, each depository institution's record
of meeting the credit needs of its local communities, including low- and
moderate-income neighborhoods, consistent with safe and sound operation and
take such record into account when evaluating certain regulatory applications.
 
  Under the BHCA, the Merger may not be consummated until the thirtieth day
following the date of Federal Reserve Board approval. With the approval of the
Federal Reserve Board and the concurrence of the United States Department of
Justice, the waiting period may be reduced to no less than 15 days. If the
United States Department of Justice were to commence an action challenging the
Merger on antitrust grounds during such period, commencement of such action
would stay the effectiveness of the Federal Reserve Board approval, unless a
court specifically orders otherwise.
 
  Zions submitted the FRB Notice seeking approval of the Merger and related
matters to the Federal Reserve Board on October 23, 1997.
 
 Colorado Banking Board
 
  Because Vectra Bank is a state-chartered bank, Zions must obtain the
approval of the State Board pursuant to Sections 11-2-109 and 11-6.4-103 of
the Colorado Financial Institutions Code. Zions submitted an application for
change of control with respect to Vectra Bank and a copy of the FRB Notice in
accordance with the Colorado Financial Institutions Code with the State Board
on October 23, 1997.
 
                                      32
<PAGE>
 
  Zions and Vectra are not aware of any material governmental approvals or
actions that are required for consummation of the Merger, except as described
above. Should any such approval or action be required, it is currently
contemplated that such approval or action would be sought.
 
  The Merger cannot proceed in the absence of the required regulatory
approvals. Zions and Vectra have agreed in the Merger Agreement to use their
reasonable best efforts in good faith to take or cause to be taken all actions
necessary, proper, desirable or advisable under applicable laws to permit
consummation of the Merger. There can be no assurance that any required
regulatory approvals will be obtained, nor can there be assurance as to the
date of any such approval. There can also be no assurance that any such
approval will not contain a condition or requirement which causes such
approval to fail to satisfy the conditions set forth in the Merger Agreement
as described below under "The Merger Agreement--Conditions."
 
RESALE OF ZIONS COMMON STOCK
 
  All shares of Zions Common Stock received by Vectra Shareholders in the
Merger will be freely transferrable, except that shares of Zions Common Stock
received by such Vectra Shareholders who are deemed to be "affiliates" (as
defined for purposes of Rule 145 under the Securities Act) of Vectra as of the
date of the Special Meeting may be resold by them only pursuant to an
effective registration statement under the Securities Act covering resales of
such shares or in transactions permitted by the resale provisions of Rule 145
of the Securities Act (or pursuant to Rule 144 under the Securities Act in the
case of such persons who become affiliates of Zions) or as otherwise permitted
under the Securities Act. Persons who may be deemed to be affiliates of Vectra
generally include individuals or entities that control, are controlled by, or
are under common control with, such entities and may include certain officers
and directors of such entities as well as principal shareholders of such
entities.
 
  Vectra has agreed in the Merger Agreement to use its reasonable best efforts
to obtain a written agreement from each person who may be deemed to be an
"affiliate" of Vectra providing that such person will not sell, transfer or
otherwise dispose of any shares of Zions Common Stock to be received by such
person in the Merger, except in compliance with the applicable provisions of
the Securities Act, and not to sell, transfer, pledge or otherwise dispose of
(i) any shares of Vectra Stock during the period commencing 30 days prior to
the Effective Date or (ii) any shares of Zions Common Stock received by such
person in the Merger until after such time as results covering at least 30
days of combined operations of Vectra and Zions have been published by Zions,
in the form of a quarterly earnings report, a report to the Commission on Form
10-K, 10-Q, or 8-K, or any other public filing or announcement which includes
such combined results of operations. Certain of the persons likely to be
deemed affiliates have pledged their shares of Vectra Stock. Any such
agreement not to sell shares of Vectra Stock would, of course, be subject to
such pledge arrangements. See "Shareholder Agreements."
 
  Commission guidelines indicate that the pooling-of-interests method
generally will not be challenged on the basis of selling of shares by
affiliates of the acquiring or the acquired company if such affiliates do not
dispose of any shares (other than a "de minimis" number of shares) of the
stock they received in connection with the Merger during the period beginning
30 days before the Merger and ending when financial results covering at least
30 days of post-merger operations of the combined enterprise have been
published. See "--Accounting Treatment."
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
 General
 
  In considering the recommendation of the Vectra Board, Vectra Shareholders
should be aware that certain members of the Board of Directors and management
of Vectra have certain interests in the transactions contemplated by the
Merger Agreement that are in addition to the interests of shareholders
generally and which may create potential conflicts of interest. These
interests include, among other things, the following: (i) in connection with
the Merger, Vectra Bank entered into an employment agreement and a non-
competition
 
                                      33
<PAGE>
 
agreement with Gary S. Judd, President and Chief Executive Officer of Vectra;
(ii) Zions will indemnify the directors and officers of Vectra and Vectra Bank
from certain liabilities and provide them with directors' and officers'
liability insurance. These interests are more fully described below; (iii)
stock options with respect to Vectra Common Stock held by directors and
certain officers of Vectra will be converted into stock options with respect
to Zions Common Stock; and (iv) change of control provisions in an existing
non-competition agreement with a Vectra director and executive officer will be
triggered.
 
 Employment Agreement
 
  In connection with the execution of the Merger Agreement, Gary S. Judd
entered into an employment agreement with Vectra Bank (the "Employment
Agreement") pursuant to which Mr. Judd will be employed by Vectra Bank as
President and Chief Executive Officer of Vectra Bank with the duties and
responsibilities as are specified in the by-laws of Vectra Bank, for a period
of three years commencing on the Effective Date (the "Period of Employment").
Vectra Bank agreed to pay Mr. Judd, at a minimum, a base annual salary equal
to the base annual salary paid to Mr. Judd as of September 1, 1997, payable in
monthly installments during each fiscal year, or portion thereof, in the
Period of Employment. The Employment Agreement also provides that if Mr. Judd
is terminated by Vectra Bank prior to the end of the Period of Employment,
other than for a material breach of his Employment Agreement or for just
cause, or if Mr. Judd terminates his employment prior to the end of the Period
of Employment because he is not elected or re-elected to or is removed from
his position as President and Chief Executive Officer, he is not vested with
the power and authority of his position as President and Chief Executive
Officer, or if he loses significant duties and responsibilities attending such
office (a "Justified Self-Termination") (provided, however, that if Vectra
Bank is merged with another subsidiary bank of Zions, Mr. Judd may not so
terminate his employment so long as Mr. Judd shall be serving as the chief
executive officer for the banking operations of Zions in the State of Colorado
which were formerly those of Vectra Bank), Vectra Bank shall pay him an amount
equal to the sum of (a) the result of multiplying Mr. Judd's base annual
salary paid to Mr. Judd as of September 1, 1997 by the number of years (and
fractions thereof) remaining in the Period of Employment and (b) the result of
multiplying the bonuses payable to Mr. Judd pursuant to the Employment
Agreement or otherwise during the three fiscal years immediately preceding the
date of termination by the number of years (and fractions thereof) remaining
in the Period of Employment. In addition, under the Employment Agreement, Mr.
Judd will be entitled to other employee benefits, including vacation and sick
leave, participation in Zions' value-sharing plan and incentive stock plan and
participation in Zions' benefit plans.
 
  In connection with his Employment Agreement, Mr. Judd has agreed during the
Non-Competition Period (as defined herein) not to engage in the banking
business other than on behalf of Vectra Bank or its affiliates within the
counties of the State of Colorado, (ii) directly or indirectly own, manage,
operate, control, be employed by, or provide management or consulting services
in any capacity to any firm, corporation, or other entity (other than Vectra
Bank or its affiliates) engaged in the banking business in the counties of the
State of Colorado, or (iii) directly or indirectly solicit or otherwise
intentionally cause any employee, officer, or member of the respective Boards
of Directors of Vectra Bank or Zions or any of their affiliates to engage in
any action prohibited under (i) or (ii) above. In addition, during the Non-
Competition Period, following Mr. Judd's termination (i) in the event of a
Justified Self-Termination, Vectra Bank will pay Mr. Judd an annual amount of
$50,000 payable in monthly installments and (ii) if Vectra Bank terminates the
Period of Employment for other than material breach or just cause, Vectra Bank
will pay Mr. Judd an annual amount of $100,000 payable in monthly
installments. As used herein, the Non-Competition Period means the period of
time from the Effective Date until the fifth anniversary of the Effective Date
or the second anniversary of the date of termination of Mr. Judd's employment,
whichever is the first to occur. See "The Merger Agreement--Conditions."
 
                                      34
<PAGE>
 
 Indemnification; Directors' and Officers' Insurance
 
  The Merger Agreement provides that from and after the Effective Time through
the fourth anniversary of the Effective Time, Zions will indemnify each
director and officer of Vectra and Vectra Bank, determined as of the Effective
Time, against certain liabilities arising out of matters existing or occurring
at or prior to the Effective Time to the extent to which such indemnified
parties were entitled under Colorado law, the Vectra Charter and the Vectra
Bylaws in effect on September 23, 1997. Zions will also advance expenses as
incurred to the extent permitted under Colorado law, the Vectra Charter and
the Vectra Bylaws. In addition, for a period of three years after the
Effective Time, Zions has agreed to use its reasonable best efforts to
maintain in effect the current policies of directors' and officers' liability
insurance maintained by Vectra, provided that Zions is in no event obligated
to spend in connection therewith any amount per annum in excess of 125% of the
amount of annual premiums paid by Vectra for such insurance as of the date of
the Merger Agreement.
 
 Stock Option Plans
 
  The directors and certain officers and employees of Vectra have previously
received Vectra Stock Options, which entitle them to purchase shares of Vectra
Common Stock, under Vectra's Employees' Equity Incentive Plan, Vectra's Non-
Employee Directors' Stock Option Plan, Vectra's 1989 Non-Statutory Stock
Option Plan and Vectra's Incentive Stock Purchase Plan (the "Vectra Stock
Plans"). At the Effective Time, each outstanding Vectra Stock Option, whether
vested or unvested, would be converted into an option to acquire, on the same
terms and conditions as were applicable under such Vectra Stock Option, such
number of full shares of Zions Common Stock as the holder of such Vectra Stock
Option would have been entitled to receive pursuant to the Merger had such
holder exercised such Vectra Stock Option in full immediately prior to the
Effective Time, at an exercise per share equal to the aggregate exercise price
per share of the shares of Vectra Common Stock otherwise purchasable pursuant
to such Vectra Stock Option divided by the number of full shares of Zions
Common Stock subject to the option. The Vectra Stock Options which are
presently unexercisable and unvested would, pursuant to the terms of the stock
option plans under which they were granted, automatically become exercisable
and vested upon the occurrence of a "change of control," as defined in the
applicable Vectra Stock Plans. The Merger would constitute a "change of
control" for purposes of the applicable stock option plans.
 
 Change of Control Provisions
 
  Vectra Bank and Gary A. Mosko, an executive vice president of Vectra Bank
and a director of Vectra, are parties to a non-competition agreement. The non-
competition agreement provides that, upon a change of control (as defined in
such non-competition agreement), Mr. Mosko may give notice directing that the
balance of the payments due to him under the non-competition agreement be
accelerated. Thereafter, Vectra must promptly pay such balance. Mr. Mosko is
entitled to a total of $540,000 under such non-competition agreement, $180,000
of which had been paid to Mr. Mosko as of November 18, 1997. The Merger will
constitute a change of control under Mr. Mosko's non-competition agreement.
 
DISSENTERS' RIGHTS'
 
  In connection with the Merger, Vectra Preferred Shareholders may be entitled
to dissenters' rights under Article 113 of the CBCA Dissenters' Rights the
text of which is attached hereto as Appendix D. Vectra Preferred Shareholders
who do not vote in favor of the Merger and who fully comply with the
applicable provisions of Article 113 of the CBCA have the right to require the
purchase of the shares of Vectra Preferred Stock held by them for cash at the
fair market value of those shares immediately before the Effective Date of the
Merger, excluding any appreciation or depreciation in anticipation of the
Merger except to the extent that exclusion would be inequitable. FAILURE TO
COMPLY STRICTLY WITH THE PROVISIONS OF ARTICLE 113 OF THE CBCA MAY RESULT IN A
WAIVER OR FORFEITURE OF SUCH DISSENTERS' RIGHTS. SEE "DISSENTERS' RIGHTS."
 
                                      35
<PAGE>
 
ACCOUNTING TREATMENT
 
  For accounting and financial reporting purposes, it is expected that the
Merger will be accounted for as a pooling-of-interests in accordance with
generally accepted accounting principles. Under this method of accounting, the
previously recorded assets and liabilities of Zions and Vectra would be
carried forward to the Surviving Corporation at their recorded amounts; income
and expenses of the Surviving Corporation would include income and expenses of
Zions and Vectra for the entire fiscal year in which the Merger occurs; and
the reported results of the separate corporations for prior periods would, if
material, be combined and restated as the results of the Surviving
Corporation.
 
                                      36
<PAGE>
 
                             THE MERGER AGREEMENT
 
  Set forth below is a description of certain of the terms and conditions of
the Merger Agreement and related matters. This summary of the terms and
conditions of the Merger Agreement does not purport to be complete and is
qualified in its entirety by reference to the full text of the Merger
Agreement as set forth in Appendix A hereto and the text thereof is
incorporated by reference herein.
 
THE MERGER
 
  The Merger Agreement was entered into by and between Zions and Vectra as of
September 23, 1997. Pursuant to the Merger Agreement, at the Effective Time,
Vectra will merge with and into Zions, and Zions will be the Surviving
Corporation in the Merger. The separate corporate existence of Vectra will
then cease.
 
CONVERSION OF VECTRA STOCK
 
  Under the terms of the Merger Agreement, (a) each share of Vectra Common
Stock issued and outstanding at the Effective Time (other than Treasury Stock)
will be converted automatically into the right to receive 0.685 of a share of
Zions Common Stock, with any rights attached thereto under or by virtue of the
Zions Rights Plan, and (b) each share of Vectra Preferred Stock issued and
outstanding at the Effective Time (other than (i) Treasury Stock and (ii)
shares which have not been voted in favor of the Merger and with respect to
which Dissenters' Rights shall have been perfected in accordance with the
CBCA) will be converted automatically at the Effective Time into the right to
receive 7.755 shares of Zions Common Stock, with any rights attached thereto
under or by virtue of the Zions Rights Plan. Each of the Common Conversion
Number and the Preferred Conversion Number is subject to upward (but not
downward) adjustment under certain circumstances, as described herein. See "--
Termination; Conversion Number Adjustment."
 
EFFECTIVE TIME
 
  The Merger will become effective upon the filing of articles of merger and
related documents with the Utah Division of Corporation and Commercial Code
and the Secretary of State of the State of Colorado, or on such later date as
may be specified in such articles. At the Effective Time, Vectra shall be
merged with and into Zions. Vectra's separate corporate existence will
thereupon cease.
 
EXCHANGE OF STOCK CERTIFICATES
 
  At or prior to the Effective Time, Zions will deposit, or will cause to be
deposited, with a bank or trust company selected by Zions (which may be a
subsidiary of Zions) (the "Exchange Agent"), certificates representing the
shares of Zions Common Stock ("New Certificates") and an estimated amount of
cash in lieu of fractional shares to be paid in exchange for outstanding
shares of Vectra Stock.
 
  As soon as practicable after the Effective Date, but not more than five
business days thereafter, Zions will send or cause to be sent to each Vectra
Shareholder who holds of record immediately prior to the Effective Time shares
of Vectra Stock (excluding any shares of dissenting Vectra Preferred
Shareholders) a letter of transmittal (the "Letter of Transmittal"), and
instructions for use in effecting the exchange of the certificates
representing shares of Vectra Stock (a "Certificate") for the Merger
Consideration.
 
  Upon delivery to the Exchange Agent of a Certificate or Certificates, Zions
will cause New Certificates and/or any check in respect of any fractional
share interests or dividends or distributions which such holder is entitled to
receive to be delivered to such holder. After the Effective Date and until
surrendered, each Certificate will be deemed to represent only the right to
receive the Merger Consideration.
 
  At the election of Zions, no dividends or other distributions with respect
to Zions Common Stock with a record date occurring after the Effective Time
will be paid with respect to any shares of Vectra Stock represented
 
                                      37
<PAGE>
 
by a Certificate until such Certificate is delivered for exchange. Following
delivery of any such Certificate, the holder of such Certificate will be
entitled to receive only such dividends or other distributions, without
interest thereon, which theretofore had become payable with respect to shares
of Zions Common Stock such holder had the right to receive upon delivery of
the Certificate.
 
CONDUCT OF BUSINESS PRIOR TO THE MERGER
 
 Vectra
 
  Vectra has agreed in the Merger Agreement, without the prior written consent
of Zions not to, and to cause each of its subsidiaries not to:
 
    (a) conduct the business of Vectra and its subsidiaries other than in the
  ordinary and usual course or fail to use reasonable best efforts to
  preserve intact their business organizations and assets and maintain their
  rights, franchises and existing relations with customers, suppliers,
  employees and business associates, take any action that would adversely
  affect or delay the ability of Vectra, Zions or any of their subsidiaries
  to perform any of their obligations on a timely basis under the Merger
  Agreement, or take any action reasonably likely to have a Material Adverse
  Effect (as defined in the Merger Agreement) on Vectra or its subsidiaries,
  taken as a whole.
 
    (b)(i) issue, sell or otherwise permit to become outstanding, or
  authorize the creation of, any additional shares of, or rights to acquire,
  Vectra Common Stock, (ii) enter into any agreement with respect to the
  foregoing or (iii) permit any additional shares of Vectra Common Stock to
  become subject to new grants of employee or director stock options, other
  rights or similar stock-based employee rights;
 
    (c)(i) make, declare, pay or set aside for payment any dividend (other
  than (A) quarterly cash dividends on Vectra Preferred Stock in an amount
  not to exceed $1.75 per share with record and payment dates consistent with
  past practice, (B) dividends from wholly owned subsidiaries to Vectra or
  another wholly owned subsidiary of Vectra or (C) dividends required to be
  paid by a trust subsidiary of Vectra with respect to its trust preferred
  securities on or in respect of, or declare or make any distribution on, any
  shares of Vectra stock or (ii) directly or indirectly adjust, split,
  combine, redeem, reclassify, purchase or otherwise acquire, any shares of
  its capital stock;
 
    (d) enter into or amend or renew any employment, consulting, severance or
  similar agreements or arrangements with any director, officer or employee
  of Vectra or its subsidiaries, or grant any salary or wage increase or
  increase any employee benefit, except (i) for normal individual increases
  in compensation to employees in the ordinary course of business consistent
  with post practices, (ii) for other changes that are required by applicable
  law, (iii) to satisfy previously disclosed contractual obligations existing
  as of the date of the Merger Agreement or (iv) for grants of awards to
  newly hired employees consistent with past practice;
 
    (e) enter into, establish, adopt or amend (except as may be required by
  applicable law or to satisfy previously disclosed contractual obligations)
  any benefit plan in respect of any director, officer or employee of Vectra
  or its subsidiaries, or take any action to accelerate the vesting or
  exercisability of stock options, restricted stock or other compensation or
  benefits payable thereunder;
 
    (f) sell, transfer, mortgage, encumber or otherwise dispose of or
  discontinue any of its assets, deposits, business or properties except in
  the ordinary course of business and in a transaction that is not material;
 
    (g) acquire all or any portion of the assets, business, deposits or
  properties of any other entity except in the ordinary course of business
  and in a transaction that is not material;
 
    (h) make any capital expenditures other than capital expenditures in the
  ordinary course of business consistent with past practice and not to exceed
  specified amounts;
 
    (i) amend its or any subsidiary's articles or certificate of
  incorporation or bylaws;
 
 
                                      38
<PAGE>
 
    (j) implement or adopt any change in its accounting principles, practices
  or methods, other than as may be required by generally accepted accounting
  principles;
 
    (k) except in the ordinary course of business consistent with past
  practice, enter into or terminate any material contract or amend or modify
  in any material respect any of its existing material contracts;
 
    (l) except in the ordinary course of business consistent with past
  practice, generally settle any material claim, action or proceeding;
 
    (m)(i) take any action while knowing that such action would or is
  reasonably likely to prevent or impede the Merger from qualifying (A) for
  "pooling-of-interests" accounting treatment or (B) as a reorganization for
  tax purposes; or (ii) knowingly take any action that is intended or is
  reasonably likely to result in (A) any of its representations and
  warranties set forth in the Merger Agreement being or becoming untrue, (B)
  any of the conditions to the Merger not being satisfied or (C) a material
  violation of any provision of the Merger Agreement except, in each case, as
  may be required by applicable law or regulation;
 
    (n) except as required by applicable law or regulation, (i) implement or
  adopt any material change in its interest rate and other risk management
  policies, procedures or practices; (ii) fail to follow its existing
  policies or practices with respect to managing its exposure to interest
  rate and other risk; or (iii) fail to use commercially reasonable means
  recommended by Zions to avoid any material increase in its aggregate
  exposure to interest rate risk;
 
    (o) incur any indebtedness for borrowed money other than in the ordinary
  course of business; or
 
    (p) agree or commit to do any of the foregoing.
 
 Zions
 
  Zions has agreed in the Merger Agreement, without the prior written consent
of Vectra, not to, and cause each of its subsidiaries not to:
 
    (a) take any action that would adversely affect or delay the ability of
  Vectra or Zions to perform any of their obligations on a timely basis under
  the Merger Agreement, or take any action that is reasonably likely to have
  a Material Adverse Effect on Zions or its subsidiaries, taken as a whole;
  or
 
    (b)(i) take any action while knowing that such action would or is
  reasonably likely to prevent or impede the Merger from qualifying (A) for
  "pooling-of-interests" accounting treatment or (B) as a reorganization for
  tax purposes; or (ii) knowingly take any action that is intended or is
  reasonably likely to result in (A) any of its representations and
  warranties set forth in the Merger Agreement being or becoming untrue, (B)
  any of the conditions to the Merger not being satisfied or (C) a material
  violation of any provision of the Merger Agreement except, in each case, as
  may be required by applicable law or regulation.
 
CERTAIN COVENANTS
 
 Shareholder Meeting
 
  Vectra has agreed to take, in accordance with applicable law and the Vectra
Charter and the Vectra Bylaws, all action necessary to convene an appropriate
meeting of Vectra Shareholders to consider and vote upon the approval and
adoption of the Merger Agreement and any other matters required to be approved
by the Vectra Shareholders for consummation of the Merger. Except to the
extent legally required for the discharge by the Vectra Board of its fiduciary
duties as advised by counsel to the Vectra Board, the Vectra Board will
recommend that Vectra Shareholders approve the Merger and any other matters
required to be approved by the Vectra Shareholders for consummation of the
Merger.
 
 Acquisition Proposals
 
  Vectra has agreed that it will not, and it will cause its subsidiaries and
its subsidiaries' officers, directors, agents, advisors and affiliates not to,
solicit or encourage inquiries or proposals with respect to, or engage in any
 
                                      39
<PAGE>
 
negotiations concerning, or provide any confidential information to, or have
any discussions with, any person relating to, any tender or exchange offer,
proposal for a merger, consolidation or other business combination involving
Vectra or any of its subsidiaries or any proposal or offer to acquire in any
manner a substantial equity interest in, or a substantial position of the
assets or deposits of, Vectra or any of its subsidiaries (other than as
contemplated by the Merger Agreement), except to the extent legally required
for the discharge by the Vectra Board of its fiduciary duties as advised by
counsel to the Vectra Board.
 
 Indemnification of Directors and Officers; Insurance
 
  Zions has agreed that from and after the Effective Date through the fourth
anniversary of the Effective Date, Zions will indemnify and hold harmless each
present and former director and officer of Vectra or any subsidiary of Vectra
determined as of the Effective Time (the "Indemnified Parties"), against any
costs or expenses, including reasonable attorneys' fees, judgments, fines,
losses, claims, damages or liabilities, incurred in connection with any claim,
action, suit, proceeding or investigation, whether civil, criminal,
administrative or investigative, arising out of matters existing or occurring
at or prior to the Effective Time (including with respect to the Merger
Agreement or any of the transactions contemplated thereby), whether asserted,
claimed or arising prior to, at or after the Effective Time, to the extent to
which such Indemnified Parties were entitled under Colorado law and the Vectra
Charter and the Vectra Bylaws in effect on the date of the Merger Agreement.
 
  In addition, for a period of three years after the Effective Time, Zions has
agreed to use its reasonable best efforts to cause to be maintained in effect
the current policies of directors' and officers' liability insurance
maintained by Vectra (provided that Zions may substitute therefor policies of
comparable coverage with respect to claims arising from facts or events which
occurred before the Effective Time); provided, however, that in no event will
Zions be obligated to expend in connection therewith any amount per annum in
excess of 125% of the amount of the annual premiums paid as of the date of the
Merger Agreement by Vectra for such insurance (the "Maximum Amount"). If the
amount of the annual premiums necessary to maintain or procure such insurance
coverage exceeds the Maximum Amount, Zions has agreed to use all reasonable
efforts to maintain the most advantageous policies of directors' and officers'
insurance obtainable for an annual premium equal to the Maximum Amount.
Notwithstanding the foregoing, prior to the Effective Time, Zions may request
Vectra to, and Vectra shall, purchase insurance coverage, on such terms and
conditions as shall be acceptable to Zions, extending for a period of three
years Vectra's directors' and officers' liability insurance coverage in effect
as of the date of the Merger Agreement (covering past or future claims with
respect to periods before the Effective Time).
 
 Certain Filings, Consents and Arrangements
 
  Pursuant to the Merger Agreement, Zions and Vectra have made filings and
applications with the Federal Reserve Board and the State Board in order to
obtain all approvals, consents and waivers of governmental agencies or
regulatory authorities necessary or appropriate for the consummation of the
transactions contemplated by the Merger Agreement.
 
 Access to Information
 
  Upon reasonable notice, each party has agreed to afford to the other party
and its representatives access during normal business hours throughout the
period prior to the Effective Time to the books, records, properties,
personnel and to such other information as the requesting party may reasonably
request; provided, however, that no investigation pursuant to such access
shall affect or be deemed to modify any representation or warranty made in the
Merger Agreement. Each party has agreed that it will not, and will cause its
representatives not to, use any information obtained pursuant to the access
described above for any purpose unrelated to the consummation of the
transactions contemplated by the Merger Agreement. In addition, subject to the
requirements of law, each party has agreed to keep confidential, and to cause
its representatives to keep confidential, all information and documents
obtained pursuant to the access described above, subject to customary
exceptions.
 
                                      40
<PAGE>
 
CONDITIONS
 
  The obligation of Zions and Vectra to consummate the Merger is subject to
the fulfillment or written waiver prior to the Effective Time of certain
conditions, including (a) the approval of Vectra Shareholders of the Merger by
no less than the requisite percentage of the outstanding voting stock of each
class of Vectra; (b) all regulatory approvals required to consummate the
transactions contemplated by the Merger Agreement having been obtained and
remaining in full force and effect and all statutory waiting periods in
respect thereof having expired and no such approvals containing any
conditions, restrictions or requirements which the Board of Directors of Zions
reasonably determines would (i) following the Effective Time, have a Material
Adverse Effect (as defined in the Merger Agreement) on the Surviving
Corporation and its subsidiaries taken as a whole or (ii) reduce the benefits
of the transactions contemplated by the Merger Agreement to such a degree that
Zions would not have entered into the Merger Agreement had such conditions,
restrictions or requirements been known at the date of the Merger Agreement;
(c) no court, administrative agency or commission or other federal, state or
local governmental authority or instrumentality (a "Governmental Authority")
of competent jurisdiction having enacted, issued, promulgated, enforced or
entered any statute, rule, regulation, judgment, decree, injunction or other
order (whether temporary, preliminary or permanent) which is in effect at the
Effective Time and which prohibits consummation of the transactions
contemplated by the Merger Agreement; (d) the Registration Statement having
become effective under the Securities Act and no stop order suspending the
effectiveness of the Registration Statement having been issued and no
proceedings for that purpose having been initiated or threatened by the
Commission; (e) all permits and other authorizations under state securities
laws necessary to consummate the transactions contemplated by the Merger
Agreement and to issue the shares of Zions Common Stock to be issued in the
Merger having been received and being in full force and effect; and (f) the
Zions Common Stock to be issued in the Merger having been approved for listing
on NASDAQ, subject to official notice of issuance.
 
  The obligation of Zions to consummate the Merger is also subject to the
fulfillment or written waiver prior to the Effective Time of certain
additional conditions, including (a) subject to a materiality standard set
forth in the Merger Agreement, each of the representations and warranties of
Vectra contained in the Merger Agreement being true and correct as of the date
of the Merger Agreement and the Effective Time (except that representations
and warranties that by their terms speak only as of the date of the Merger
Agreement or some other date need be true and correct as of such date); and
Zions having received a certificate, dated the Effective Date, signed on
behalf of Vectra by the Chief Executive Officer and the Chief Financial
Officer of Vectra to such effect; (b) Vectra having performed in all material
respects all obligations required to be performed by it under the Merger
Agreement at or prior to the Effective Time, and Zions having received a
certificate, dated the Effective Date, signed on behalf of Vectra by the Chief
Executive Officer and the Chief Financial Officer of Vectra to such effect;
(c) Zions' having received an opinion of Sullivan & Cromwell, special counsel
to Zions, dated the Effective Date, to the effect that, on the basis of facts,
representations and assumptions set forth in such opinion, the Merger
constitutes a reorganization under Section 368 of the Code; (d) Zions' having
received letters from KPMG Peat Marwick LLP, Vectra's independent auditors,
dated (i) the date on which the Registration Statement shall become effective
and (ii) a date shortly prior to the Effective Date, addressed to Zions and
Zions' directors and officers, in form and substance customary for "comfort"
letters delivered by independent accountants in accordance with Statement of
Accounting Standards No. 72; and (e) Zions' having received from KPMG Peat
Marwick LLP, Zions' independent auditors, letters, dated the date of or
shortly prior to each of the mailing date of this Proxy Statement-Prospectus
and the Effective Date, stating its opinion that the Merger shall qualify for
pooling-of-interests accounting treatment. Zions will waive the condition to
consummation referred to in clause (e) of the immediately preceding sentence,
but only in the event and to the extent that the loan described under "The
Companies--Zions Loan to Vectra" and certain related transactions would
prevent Zions from obtaining the letters referred to in such clause (e). Zions
does not believe that the loan and related transactions will prevent it from
obtaining such letters.
 
  The obligation of Vectra to consummate the Merger is also subject to the
fulfillment or written waiver prior to the Effective Time of certain
additional conditions, including (a) subject to a materiality standard set
forth in the Merger Agreement, each of the representations and warranties of
Zions contained in the Merger Agreement
 
                                      41
<PAGE>
 
being true and correct as of the date of the Merger Agreement and as of the
Effective Date as though made on and as of the Effective Date (except that
representations and warranties that by their terms speak only as of the date
of the Merger Agreement or some other date need only be true and correct as of
such date), and Vectra having received a certificate, dated the Effective
Date, signed on behalf of Zions by the Chief Executive Officer and the Chief
Financial Officer of Zions to such effect; (b) Zions' having performed in all
material respects all obligations required to be performed by it under the
Merger Agreement at or prior to the Effective Time, and Vectra's having
received a certificate, dated the Effective Date, signed on behalf of Zions by
the Chief Executive Officer and the Chief Financial Officer of Zions to such
effect; (c) Vectra's having received an opinion of Lewis, Rice & Fingersh,
L.C. special counsel to Vectra, dated the Effective Date, to the effect that,
on the basis of facts, representations and assumptions set forth in such
opinion, (i) the Merger constitutes a "reorganization" within the meaning of
Section 368 of the Code and (ii) no gain or loss will be recognized by Vectra
Shareholders who receive shares of Zions Common Stock in exchange for shares
of Vectra Stock, except with respect to cash received in lieu of fractional
share interests and, in the case of Vectra Preferred Shareholders, with
respect to cash received upon exercise of Dissenters' Rights; (d) Vectra's
having received letters from KPMG Peat Marwick LLP, Zions' independent
auditors, dated (i) the date on which the Registration Statement becomes
effective and (ii) a date shortly prior to the Effective Date, addressed to
Vectra, in form and substance customary for "comfort" letters delivered by
independent accountants in accordance with Statement of Accounting Standards
No. 72; (e) no Stock Acquisition Date (as such term is defined in Zions'
Shareholder Protection Rights Plan) having occurred under the Shareholder
Protection Rights Plan prior to the Effective Time; (f) Vectra's having
received the written opinion of Wallach to the effect that, as of the date of
the mailing of this Proxy Statement-Prospectus to the Vectra Shareholders in
connection with the Special Meeting, the consideration to be received by the
holders of Vectra Stock in the Merger is fair to the holders of Vectra Stock
from a financial point of view; and (g) Vectra's having received from KPMG
Peat Marwick LLP, Vectra's independent auditors, letters, dated the date of or
shortly prior to each of the mailing date of this Proxy Statement-Prospectus
and the Effective Date, stating its opinion that the Merger shall qualify for
pooling-of-interests accounting treatment.
 
WAIVER AND AMENDMENT
 
  Prior to the Effective Time, any provision of the Merger Agreement may be
(i) waived by the party benefitted by the provision, or (ii) amended or
modified at any time, by an agreement in writing between Zions and Vectra,
except that after the Special Meeting, the Merger Agreement may not be amended
if it would violate the CBCA or reduce the consideration to be received by
Vectra Shareholders in the Merger.
 
TERMINATION; CONVERSION NUMBER ADJUSTMENT
 
 Termination
 
  The Merger Agreement may be terminated, and the Merger abandoned, prior to
the Effective Time, either before or after its approval by the Vectra
Shareholders (a) at any time prior to the Effective Time, by the mutual
consent of Zions and Vectra; (b) at any time prior to the Effective Time, by
Zions or Vectra, in the event of either: (i) a breach by the other party of
any representation or warranty contained in the Merger Agreement, which breach
cannot be or has not been cured within 30 days after the giving of written
notice to the breaching party of such breach; or (ii) a breach by the other
party of any of the covenants or agreements contained in the Merger Agreement,
which breach cannot be or has not been cured within 30 days after the giving
of written notice to the breaching party of such breach, provided that such
breach (whether under (i) or (ii)) would be reasonably likely, individually or
in the aggregate with other breaches, to result in a Material Adverse Effect;
(c) at any time prior to the Effective Time, by Zions or Vectra, in the event
that the Merger is not consummated by March 31, 1998, except to the extent
that the failure of the Merger to be consummated by March 31, 1998 arises out
of or results from the knowing action or inaction of the party seeking to
terminate the Merger Agreement pursuant to this clause; (d) by Vectra or
Zions, in the event (i) the approval of any Governmental Authority required
for consummation of the Merger and the other transactions contemplated by the
Merger Agreement shall have been denied by final nonappealable action of such
Governmental Authority or (ii) the Vectra Shareholder approval solicited
hereby is not obtained at the Special Meeting; (e) at any time prior to the
 
                                      42
<PAGE>
 
Special Meeting, by Zions if the Vectra Board fails to recommend approval of
the Merger Agreement and any other matters required to be approved by Vectra
Shareholders for consummation of the Merger, withdraws such recommendation or
modifies or changes such recommendation in a manner adverse in any respect to
the interests of Zions.
 
 Conversion Number Adjustment
 
  The Merger Agreement may also be terminated, and the Merger abandoned, prior
to the Effective Time by Vectra, either before or after its approval by the
Vectra Shareholders if:
 
    (1) The Average Closing Price on the Determination Date of shares of
  Zions Common Stock shall be less than the Starting Price; and
 
    (2)(i) the number obtained by dividing the Average Closing Price on such
  Determination Date by the Starting Price (such number being referred to
  herein as the "Zions Ratio") shall be less than (ii) the number obtained by
  dividing the KBW Average Index by the KBW Starting Index and multiplying
  the quotient in this clause (2) (ii) by 0.82 (such number being referred to
  herein as the "Index Ratio"):
 
  If, however, Vectra elects to exercise its termination right for the
foregoing reason, Vectra must give written notice to Zions within 24 hours of
the Determination Date. Moreover, prior to the Effective Date, Zions will have
the opportunity to adjust upward (x) the Common Conversion Number to equal the
lesser of (i) a number equal to a quotient (rounded to the nearest one-
thousandth), the numerator of which is the product of the Starting Price and
the Common Conversion Number (as then in effect) and the denominator of which
is the Average Closing Price, and (ii) a number equal to a quotient (rounded
to the nearest one-thousandth), the numerator of which is the Index Ratio
multiplied by the Common Conversion Number (as then in effect) and the
denominator of which is the Zions Ratio and (y) the Preferred Conversion
Number to equal the lesser of (i) a number equal to a quotient (rounded to the
nearest one-thousandth), the numerator of which is the product of the Starting
Price and the Preferred Conversion Number (as then in effect) and the
denominator of which is the Average Closing Price, and (ii) a number equal to
a quotient (rounded to the nearest one-thousandth), the numerator of which is
the Index Ratio multiplied by the Preferred Conversion Number (as then in
effect) and the denominator of which is the Zions Ratio.
 
  If Zions elects to so adjust the Common Conversion Number and the Preferred
Conversion Number, Zions must give prompt written notice to Vectra of such
election and the revised Common Conversion Number and Preferred Conversion
Number. In such event, the Merger Agreement will not be terminated but will
remain in effect in accordance with its terms (except as the Common Conversion
Number and the Preferred Conversion Number shall have been so modified).
 
 Effect of Termination
 
  In the event of the termination of the Merger Agreement by either Zions or
Vectra, as provided above, neither Zions nor Vectra will have any liability or
further obligation to the other party except to the extent the Merger
Agreement specifically provides that certain covenants survive such
termination and except that such termination will not relieve a breaching
party from liability for any willful breach of the Merger Agreement giving
rise to such termination.
 
                                      43
<PAGE>
 
                          THE STOCK OPTION AGREEMENT
 
GENERAL
 
  As an inducement and condition to Zions entering into the Merger Agreement,
Vectra entered into the Stock Option Agreement with Zions. Pursuant to the
Stock Option Agreement, Vectra granted to Zions an unconditional, irrevocable
option, exercisable only under certain limited and specifically defined
circumstances, none of which, to the best of Vectra's and Zions' knowledge,
has occurred as of the date hereof, to purchase up to 959,462 authorized but
theretofore unissued shares of Vectra Common Stock (or such lesser amount as
shall constitute 19.9% of the shares of Vectra Common Stock, outstanding on
the date of exercise), for a purchase price of $23.39 per share, subject to
adjustment in certain circumstances. The purchase of Vectra Common Stock
pursuant to the Stock Option Agreement is subject to compliance with
applicable law, including receipt of any necessary approvals under the BHCA.
 
  The Stock Option Agreement and the Option are intended to increase the
likelihood that the Merger will be consummated according to the terms set
forth in the Merger Agreement, and may be expected to discourage offers by
third parties to acquire Vectra prior to the Merger.
 
THE OPTION
 
  Provided that (i) Zions is not in material breach of the agreements or
covenants contained in the Stock Option Agreement or the Merger Agreement and
(ii) no preliminary or permanent injunction or other order against delivery of
shares covered by the Option issued by any court of competent jurisdiction in
the United States is in effect, Zions may exercise the Option, in whole or
part, at any time and from time to time following the occurrence of a Purchase
Event, including (a) the acquisition by any person other than Zions of any
subsidiary of Zions of beneficial ownership (as such term is defined in the
Exchange Act and the rules and regulations thereunder) of shares of Vectra
Common Stock, such that, upon the consummation of such acquisition, such
person would have beneficial ownership, in the aggregate, of 25% or more of
the then outstanding shares of Vectra Common Stock; or (b) Vectra or any of
its subsidiaries' having entered into an agreement to engage in an Acquisition
Transaction (as defined below) with any person other than Zions or any of its
subsidiaries or the Vectra Board's having recommended that the Vectra
Shareholders approve or accept any Acquisition Transaction with any person
other than Zions or any subsidiary of Zions. As used herein, "Acquisition
Transaction" shall mean (x) a merger or consolidation, or any similar
transaction, involving Vectra or any of its subsidiaries, (y) a purchase,
lease or other acquisition of all or substantially all of the assets of or
assumption of all or substantially all the deposits of Vectra or any of its
subsidiaries or (z) a purchase or other acquisition (including by way of
merger, consolidation, share exchange or otherwise) of securities representing
25% or more of the voting power of Vectra or any of its subsidiaries, provided
that the term "Acquisition Transaction" does not include any internal merger
or consolidation involving only Vectra and/or its subsidiaries.
 
TERMINATION OF OPTION
 
  The Option shall terminate and be of no further force and effect upon the
earliest to occur of (i) the time immediately prior to the Effective Time,
(ii) 12 months after the first occurrence of a Purchase Event, (iii) 18 months
after the termination of the Merger Agreement following the occurrence of a
Preliminary Purchase Event (as defined below), (iv) termination of the Merger
Agreement in accordance with the terms thereof prior to the occurrence of a
Purchase Event or a Preliminary Purchase Event (other than a termination of
the Merger Agreement by Zions pursuant to Section 8.01(b)(i) or (ii) thereof
(breach of the Merger Agreement by either party entitling the other party to
terminate the Merger Agreement) or by Grantee and Issuer pursuant to Section
8.01(a) thereof (mutual agreement to terminate the Merger Agreement) thereof
if Zions shall at that time have been entitled to terminate the Merger
Agreement pursuant to Section 8.01(b)(i) or (ii) thereof (provided that the
breach of Vectra giving rise to such termination or such right to terminate
was willful)), or (v) 18 months after the termination of the Merger Agreement
by Zions pursuant to Section 8.01(b)(i) or (ii) thereof or by Zions and Vectra
pursuant to Section 8.01(a) thereof if Zions shall at that time have been
entitled to terminate the
 
                                      44
<PAGE>
 
Merger Agreement pursuant to Section 8.01(b)(i) or (ii) thereof (provided that
the breach of Vectra giving rise to such termination or such right to
terminate was willful).
 
  "Preliminary Purchase Event" means any of the following events or
transactions occurring after the date of the Stock Option Agreement:
 
    (i) Vectra or any of its subsidiaries having entered into an agreement to
  engage in an Acquisition Transaction with any person other than Zions or
  any of its subsidiaries or the Vectra Board's having recommended that the
  Vectra Shareholders approve or accept any Acquisition Transaction with any
  person other than Zions or any subsidiary of Zions;
 
    (ii) any person's (other than Zions or any subsidiary of Zions or any
  subsidiary of Vectra acting in a fiduciary capacity in the ordinary course
  of business) having acquired beneficial ownership or the right to acquire
  beneficial ownership, of shares of Vectra Common Stock such that, upon the
  consummation of such acquisition, such person would have beneficial
  ownership, in the aggregate, of 10% or more of the then outstanding shares
  of Vectra Common Stock;
 
    (iii) any person's, other than that of Zions or any subsidiary of Zions,
  having made a bona fide proposal to Vectra or the Vectra Shareholders by
  public announcement or written communication that is or becomes the subject
  of public disclosure, to engage in an Acquisition Transaction (including,
  without limitation, any situation in which any person's, other than that of
  Zions or subsidiary of Zions, having commenced (as such term is defined in
  Rule 14d-2 under the Exchange Act) or having filed a registration statement
  under the Securities Act with respect to, a tender offer or exchange offer
  to purchase any shares of Vectra Common Stock such that, upon consummation
  of such offer, such person would own or control 10% or more of the then
  outstanding shares of Vectra Common Stock (such an offer being referred to
  herein as a "Tender Offer" or an "Exchange Offer", respectively));
 
    (iv) after a proposal is made by a third party to Vectra or the Vectra
  Shareholders to engage in an Acquisition Transaction, or such third party
  states its intention to make such a proposal if the Merger Agreement
  terminates and/or the Option expires, Vectra shall have breached any
  covenant or obligation contained in the Merger Agreement and such breach
  would entitle Zions to terminate the Merger Agreement (without regard to
  the cure period provided for therein unless such cure is promptly effected
  without jeopardizing consummation of the Merger pursuant to the terms of
  the Merger Agreement);
 
    (v) Vectra Shareholders' not having approved the Merger Agreement by the
  requisite vote at the meeting of the Vectra Shareholders held for the
  purpose of voting on the Merger Agreement, or such meeting shall not have
  been held or shall have been canceled prior to termination of the Merger
  Agreement, in each case after it shall have been publicly announced that
  any person (other than Zions or any subsidiary of Zions) shall have (A)
  made, or disclosed an intention to make, a bona fide proposal to engage in
  an Acquisition Transaction, (B) commenced a Tender Offer or filed a
  registration statement under the Securities Act with respect to an Exchange
  Offer or (C) filed an application (or given a notice) with, whether in
  draft of final form, the Federal Reserve Board or any other governmental
  authority or regulatory or administrative agency or commission (each, a
  "Governmental Entity"), for approval to engage in an Acquisition
  Transaction;
 
    (vi) any Person's (other than Zions or any subsidiary of Zions), other
  than in connection with a transaction to which Zions has given its prior
  written consent, having filed an application or notice with the Federal
  Reserve Board or other Governmental Entity for approval to engage in an
  Acquisition Transaction; or
 
    (vii) Vectra Board's having withdrawn or modified (or publicly announced
  its intention to withdraw or modify) in any manner adverse in any respect
  to Zions its recommendation that the Vectra Shareholders approve the
  transactions contemplated by the Merger Agreement, or Vectra or any of its
  subsidiaries' having authorized, recommended, proposed (or publicly
  announced its intention to authorize, recommend or propose) an agreement to
  engage in an Acquisition Transaction with any person other than Zions or a
  subsidiary of Zions.
 
                                      45
<PAGE>
 
                          THE SHAREHOLDER AGREEMENTS
 
  Zions has entered into Shareholder Agreements with Messrs. Gary S. Judd, Ray
L. Nash, Gary A. Mosko, Robert A. Silverberg, Robert D. Greene, Richard B.
Tucker, W. James Tozer, Jr. and James L. Rumsey and Ms. Mary Gittings Cronin
(the "Inside Shareholders"), each a director and/or officer of Vectra. The
Inside Shareholders, holding in the aggregate shares representing
approximately 17.4% of the total voting power of Vectra Common Stock and 28.6%
of the total voting power of Vectra Preferred Stock as of the Record Date,
each agreed, in consideration of the substantial expenses incurred by Zions in
connection with the Merger Agreement and as a condition to Zions entering into
the Merger Agreement, to vote or to cause to be voted, or execute a written
consent with respect to, all of such Inside Shareholder's shares of Vectra
Stock in favor of adoption and approval of the Merger Agreement and the Merger
at every meeting of Vectra Shareholders at which such matters are considered
and at every adjournment thereof and in connection with every proposal to take
action by written consent with respect thereto.
 
  Each Shareholder Agreement also provides that the Inside Shareholder will
not, and will not permit any entity under its control to, deposit any of such
Inside Shareholder's shares of Vectra Common Stock in a voting trust or
subject any such shares to any agreement, arrangement or understanding with
respect to the voting of such shares inconsistent with the Shareholder
Agreement entered into by that Inside Shareholder. In addition, the Inside
Shareholders each agreed not to sell, assign, pledge, encumber, transfer or
otherwise dispose of any of his or her shares of Vectra Common Stock during
the term of the relevant Shareholder Agreement except in connection with the
exercise of rights. However, certain of the Inside Shareholders had, prior to
the time of entering into the Shareholder Agreements, pledged their shares of
Vectra Stock to secure certain obligations of such Inside Shareholders to
various financial institutions. The pledge arrangements pursuant to which such
Inside Shareholders had pledged their shares may restrict the ability of the
Inside Shareholders to vote their shares or otherwise comply with the
foregoing obligations contemplated by the Shareholder Agreements. Each of the
Inside Shareholders have represented to Zions in the Shareholder Agreements
that (i) until such time as there may exist a default under the relevant
pledge arrangement, the pledge arrangement would not prohibit or otherwise
prevent such Inside Shareholder from executing and delivering the Shareholder
Agreement and consummating the transactions contemplated thereby and (ii) such
Inside Shareholder is not currently in default under the relevant pledge
arrangement and that no event has occurred that, with the lapse of time or
giving of notice (or both), would constitute a default under the pledge
arrangement.
 
  The Shareholder Agreements will terminate upon the earlier to occur of the
Effective Time or the date on which the Merger Agreement is terminated in
accordance with its terms.
 
  The Shareholder Agreements bind the actions of the signatories thereto only
in their capacity as Vectra Shareholders. Those directors of Vectra who signed
Shareholder Agreements are not and could not be contractually bound to
abrogate their fiduciary duties as directors of Vectra. Accordingly, while
such shareholders/directors are, under the Shareholder Agreements executed by
them, contractually bound to vote as a Vectra Shareholder in favor of the
Merger, their fiduciary duties as directors of Vectra nevertheless required
them to act in their capacity as directors in the best interest of Vectra when
they decided to approve the Merger. In addition, such shareholders/directors
will continue to be bound by their fiduciary duties as directors of Vectra
with respect to any decisions they may take in connection with the Merger or
otherwise.
 
                                      46
<PAGE>
 
             VOTING SECURITIES AND PRINCIPAL SHAREHOLDERS OF ZIONS
 
  The following table sets forth as of June 30, 1997 the record and beneficial
ownership of Zions Common Stock by the principal shareholders of Zions Common
Stock.
 
<TABLE>
<CAPTION>
                                                                 COMMON STOCK
                                                                ---------------
                                                                 NO. OF   % OF
         NAME AND ADDRESS                   TYPE OF OWNERSHIP    SHARES   CLASS
         ----------------                   -----------------   --------- -----
     <S>                                  <C>                   <C>       <C>
     Roy W. Simmons...................... Record and Beneficial 2,291,911 3.82%
       One South Main Street              Beneficial(1)         1,991,376 3.32%
                                                                --------- ----
       Salt Lake City, Utah 84111                               4,283,287 7.14%
     Zions First National Bank........... Record(2)             4,581,822 7.60%
       One South Main Street
       Salt Lake City, Utah 84111
</TABLE>
- --------
(1) Represents Roy W. Simmons' beneficial ownership interest in 1,991,376
    shares held by a company in which Mr. Simmons serves as a director.
 
(2) These shares are owned of record as of June 30, 1997 by ZFNB in its
    capacity as fiduciary for various trust and advisory accounts. Of the
    shares shown, ZFNB has sole voting power with respect to a total of
    3,286,821 shares (5.45% of the class) it holds as trustee for the Zions
    Bancorporation Employee Stock Savings Plan, the Zions Bancorporation
    Employee Investment Savings Plan, and the Zions Bancorporation Profit
    Sharing Plan. ZFNB also acts as trustee for the Zions Bancorporation
    Dividend Reinvestment Plan, which holds 998,864 shares (1.66% of the
    class) and the Zions Bancorporation PAYSOP Plan, which holds 296,137
    shares (.49% of the class) as to which ZFNB does not have or share voting
    power.
 
  The following table sets forth as of June 30, 1997 the amount and percent of
beneficial ownership of Zions Common Stock held by each of Zions' directors
and all directors and officers as a group.
 
<TABLE>
<CAPTION>
                                                      NO. OF SHARES    % OF
        DIRECTORS                                   BENEFICIALLY OWNED CLASS
        ---------                                   ------------------ -----
       <S>                                          <C>                <C>
       Jerry C. Atkin..............................         8,800           (1)
       R. D. Cash..................................        26,000           (1)
       Grant R. Caldwell...........................         6,000           (1)
       Richard H. Madsen...........................       197,372           (1)
       Roger B. Porter.............................         2,000           (1)
       Robert G. Sarver............................       300,194           (1)
       Harris H. Simmons...........................     2,400,179(2)    4.00
       L. E. Simmons...............................     2,219,837(2)    3.70
       Roy W. Simmons..............................     4,283,287(2)    7.14
       I. J. Wagner................................       284,000           (1)
       Dale W. Westergard(3).......................       163,022           (1)
       All directors and officers as a group (31
        persons)...................................     7,243,523      12.02
</TABLE>
- --------
(1) Immaterial percentage of ownership.
 
(2) Totals include 1,991,376 shares attributed to each individual through
    serving as a director in a company holding such shares in Zions. Of such
    1,991,376 shares attributed to Harris H. Simmons, Mr. Simmons holds an
    option to acquire 186,792 shares, of all which are vested and presently
    exercisable.
 
(3) Mr. Westergard died October 9, 1997.
 
                                      47
<PAGE>
 
                     CERTAIN DIFFERENCES IN THE RIGHTS OF
                  ZIONS SHAREHOLDERS AND VECTRA SHAREHOLDERS
 
GENERAL
 
  Upon consummation of the Merger, Vectra Shareholders will become
shareholders of Zions, a Utah corporation. Thus, the Utah Revised Business
Corporation Act and the Zions Charter and Zions Bylaws will govern the rights
of the Vectra Shareholders who become shareholders of Zions. Because the Zions
Charter and the Zions Bylaws and the Vectra Charter and the Vectra Bylaws are
not the same, the Merger will result in certain differences in the rights of
the holders of Vectra Common Stock. The following is a summary of certain of
the more significant differences.
 
VOTING RIGHTS
 
 General
 
  The holders of Zions Common Stock, like the holders of Vectra Common Stock,
are generally entitled to one vote for each share held of record on all
matters submitted to a shareholder vote. The holders of Zions Common Stock and
Vectra Common Stock do not have cumulative voting rights. The absence of
cumulative voting means that a nominee for director must receive the votes of
a plurality of the shares voted in order to be elected. In general, the
holders of Vectra Preferred Stock have no voting rights.
 
 Special Votes for Certain Transactions
 
  The Zions Charter contains provisions requiring special shareholder votes to
approve certain types of transactions. In the absence of these provisions,
either the transactions would require approval by a majority of the shares
voted at a meeting or no shareholder vote would be required.
 
  The Zions Charter requires that certain "business transactions" between
Zions or a subsidiary and a "related person" be approved by the affirmative
votes of the holders of not less than 80% of the voting power of all
outstanding voting stock of Zions. A "related person" is generally defined by
the Zions Charter to mean a person, corporation, partnership, or group acting
in concert that beneficially owns 10% or more of the voting power of Zions'
outstanding stock.
 
  The business transactions subject to Zions' special vote requirements
include (1) a merger or consolidation involving Zions or a subsidiary of Zions
with a related person; (2) the sale, lease, exchange, transfer or other
disposition of all or any substantial part of the assets of either Zions or a
subsidiary of Zions to, with or for the benefit of a related person; (3) the
issuance, sale, exchange or other disposition by Zions or a subsidiary of
Zions to a related person of securities of Zions or a subsidiary of Zions
having an aggregate fair market value of $5 million or more; (4) any
liquidation, spinoff, split-off, split-up, or dissolution of Zions by or on
behalf of a related person; (5) any recapitalization or reclassification of
the securities of Zions or other transaction that would have the effect of
increasing the voting power of a related person or reducing the number of
shares of each class of voting securities outstanding; and (6) any agreement,
contract, or other arrangement providing for any of the transactions set forth
above.
 
  Such special shareholder vote requirements do not apply to any transaction
approved by a majority of the "continuing directors," or if various specified
conditions are met. A continuing director is any member of the Zions Board who
is not a related person or an interested shareholder or an affiliate or
associate of a related person and who (1) was a director on February 21, 1986
or (2) became a director subsequent to that date and whose election or
nomination for election by Zions' shareholders was approved by a majority of
the continuing directors then on the Board.
 
  The Vectra Charter and Vectra Bylaws contain no similar provision.
 
 
                                      48
<PAGE>
 
SHAREHOLDER RIGHTS PLAN
 
  In September 1996, Zions entered into the Shareholder Protection Rights
Agreement, dated September 27, 1996 (the "Zions Rights Plan"), with Zions
First National Bank, as rights agent, and the Zions Board declared a dividend
of one right (the "Rights") on each outstanding share of Zions Common Stock.
The Zions Rights Plan was not adopted in response to any specific effort to
acquire control of Zions. Rather, it was adopted to deter abusive takeover
tactics that can be used to deprive shareholders of the full value of their
investment.
 
  Until it is announced that a person or group has acquired 10% or more of
Zions Common Stock (an "Acquiring Person") or commences a tender offer that
will result in such person or group owning 10% or more of Zions Common Stock,
the Rights will be evidenced by the Zions Common Stock certificates, will
automatically trade with the Zions Common Stock and will not be exercisable.
Thereafter, separate Rights certificates will be distributed and each Right
will entitle its holder to purchase Participating Preferred Stock of Zions
having economic and voting terms similar to those of one share of Common Stock
for an exercise price of $90.00.
 
  Upon announcement that any person or group has become an Acquiring Person,
10 days thereafter (or such earlier or later date as the Zions Board may
decide) (the "Flip-in Date") each Right (other than Rights beneficially owned
by any Acquiring Person or transferees thereof, which Rights become void) will
entitle its holder to purchase, for the exercise price, a number of shares of
Zions Common Stock or Participating Preferred Stock having a market value of
twice the exercise price.
 
  In addition, if, after an Acquiring Person controls Zions' Board, Zions is
involved in a merger or sells more than 50% of its assets or earning power (or
has entered into an agreement to do any of the foregoing) and, in the case of
a merger, the Acquiring Person will receive different treatment than all other
shareholders or the person with whom the merger occurs is the Acquiring Person
or a person affiliated or associated with the Acquiring Person, each Right
will entitle its holder to purchase, for the exercise price, a number of
shares of common stock of the Acquiring Person having a market value of twice
the exercise price. If any person or group acquires between 10% and 50% of the
Zions Common Stock, Zions Board may, at its option, exchange one share of
Zions Common Stock for each Right.
 
  Vectra has no such shareholder protection rights plan.
 
BOARD OF DIRECTORS
 
 Director Liability
 
  As permitted by Utah law, the Zions Charter provides that directors shall
not be liable for monetary damages to the corporation or its shareholders for
a breach of fiduciary duty as a director other than (i) a breach of a
director's duty of loyalty, (ii) acts or omissions not taken in good faith or
which involve intentional misconduct or a knowing violation of law, (iii)
authorizing the unlawful payment of dividends, and (iv) transactions in which
a director receives an improper benefit.
 
  Colorado law provides that a corporation's articles of incorporation may set
forth a provision that eliminates or limits the liability of a director to the
corporation for money damages for any action taken or any failure to take any
action as a director, except that any such provision shall not eliminate or
limit the liability of a director to the corporation or to its shareholders
for monetary damages for any breach of the director's duty of loyalty to the
corporation or to its shareholders, acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, voting for
or assenting to a distribution made in violation of Colorado law or such
corporation's articles of incorporation, or any transaction from which the
director directly or indirectly derived an improper personal benefit. The
Vectra Charter limits directors' personal liability to the corporation or its
shareholders for breach of fiduciary duty as a director to the full extent
provided for by Colorado law.
 
 
                                      49
<PAGE>
 
 Classified Board
 
  Zions Charter divides the Zions Board into three classes, each consisting of
one-third (or as near as may be) of the whole number of the Board of
Directors. Utah law requires that each class contain as equal a number of
directors as possible. One class of directors is elected at each annual
meeting of shareholders, and each class serves for a term of three years.
 
  The number of directors which constitute Zions' full Board of Directors may
be increased or decreased only by amendment of the Zions Bylaws, which
requires the affirmative vote of two-thirds of the total number of directors
constituting the entire Zions Board, or by the shareholders of Zions at a
regular or special meeting by the affirmative vote of two-thirds of the
outstanding and issued shares entitled by statute to vote. Except as otherwise
required by law, vacancies on the Zions Board, including vacancies resulting
from an increase in the size of the Zions Board, may be filled by the
affirmative vote of a majority of the remaining directors even though less
than a quorum of the Zions Board. Zions' directors elected by the Zions Board
to fill vacancies serve for the full remainder of the term of the class to
which they have been elected.
 
  The Vectra Charter and Vectra Bylaws do not provide for a classified Board
of Directors. The Vectra Bylaws provide that vacancies occurring on the Vectra
Board, including vacancies resulting from an increase in the size of the
Vectra Board, are to be filled by the affirmative vote of a majority of the
remaining directors even though less than a quorum. A Vectra director elected
by the Vectra Board to fill a vacancy serves for the full remainder of the
term of such director's predecessor.
 
 Removal of Directors
 
  The Zions Charter provides that any director (or the entire Zions Board) may
be removed from office by shareholder vote only if such removal is approved by
the holders of two-thirds of the issued and outstanding shares then entitled
to vote at an election of directors.
 
  The Vectra Bylaws provide that, at a meeting of shareholders called
expressly for that purpose, any or all directors may be removed with or
without cause by a majority vote of the shares entitled to vote.
 
SHAREHOLDER MEETINGS
 
  Utah law provides that special meetings of a corporation's shareholders may
be called by the board of directors or such other persons authorized by the
bylaws to call a special meeting or by the holders of at least 10% of all the
votes entitled to be cast on any issue proposed to be considered at the
special meeting. Under the Zions Bylaws, special meetings may also be called
by the president.
 
  Under the Vectra Bylaws, special meetings of shareholders may be called by
the president, the Vectra Board or holders of at least 10% of all shares
entitled to vote at the meeting.
 
AMENDMENT OF ARTICLES AND BYLAWS
 
  The Zions Charter requires the affirmative vote of the holders of two-thirds
of all outstanding voting stock of Zions to approve any amendment to the Zions
Charter, provided that the provisions regarding a special shareholder vote for
business transactions may only be repealed or amended by the affirmative vote
of 80% of the issued and outstanding stock entitled to vote. The Zions Bylaws
may be amended by an affirmative vote of two-thirds of the total number of
directors constituting the entire Zions Board or by the affirmative vote of
two-thirds of the issued and outstanding shares entitled to vote.
 
  Under Colorado law, the Vectra Charter may be amended at an annual or
special shareholder meeting by an affirmative majority vote of all votes cast.
The Vectra Bylaws provide that they may be amended by the affirmative vote of
a majority of the Vectra Board at the annual meeting of the Vectra Board or at
any special
 
                                      50
<PAGE>
 
meeting of the Vectra Board called for that purpose, subject to repeal or
change by action of the Vectra Shareholders.
 
DISSENTERS' RIGHTS
 
  Utah law provides for dissenters' rights in a variety of transactions
including: (i) any plan of merger to which a corporation is a party (other
than mergers or consolidations not requiring a shareholder vote); (ii) certain
sales, leases, exchanges or other dispositions of all or substantially all of
the assets of a corporation; and (iii) certain share exchanges. However,
shareholders of a Utah business corporation are not entitled to dissenters'
rights in any of the transactions mentioned above if their stock is either
listed on a national securities exchange or on the NASDAQ National Market
System or held of record by 2,000 or more shareholders. The aforementioned
provisions do not apply if the shareholder will receive for his shares
anything except (a) shares of the corporation surviving the consummation of
the plan of merger or share exchange, (b) shares of a corporation whose shares
are listed on a national securities exchange or the NASDAQ National Market
System or held of record by not less than 2,000 holders, or (c) cash in lieu
of fractional shares. Zions Common Stock currently is listed for trading in
the NASDAQ National Market System and has more than 2,000 shareholders of
record.
 
  Colorado law provides that any shareholder of a Colorado corporation shall
have the right to dissent from any of the following corporate actions in which
such shareholder is entitled to vote: (1) consummation of a plan of merger to
which the corporation is a party if either (i) shareholder approval is
required by Colorado laws or the corporation's articles or (ii) the
corporation is a subsidiary that is merged with its parent under Colorado law;
(2) consummation of a sale, lease, exchange or other disposition of all, or
substantially all, of the property of the corporation or property of an entity
controlled by the Corporation not made in the usual and regular course of
business; and (3) consummation of a plan of share exchange to which the
corporation is a party as the corporation whose shares will be acquired.
 
  Shareholders of a Colorado corporation are not entitled to dissent from a
plan of merger if the shares held by the shareholders are part of a class or
series of shares registered on a national securities exchange, were listed on
the NASDAQ National Market System or were held of record by at least 2,000
shareholders on the date fixed to determine the shareholders entitled to vote
on the proposed corporate action. Vectra Common Stock is listed on the NASDAQ
National Market System. As a result, Vectra Common Shareholders are not
entitled to exercise any rights of dissenting shareholders under Colorado law,
but Vectra Preferred Shareholders are entitled to exercise such rights. See
"Dissenters' Rights."
 
DIVIDEND RIGHTS
 
  Utah law generally allows a corporation, subject to restrictions in its
certificate of incorporation, to declare and pay dividends in cash or
property, but only if the corporation is solvent and payment would not render
the corporation insolvent. The Zions Charter places no further restrictions on
distributions. Thus, the holders of Zions Common Stock are entitled to
dividends when, as and if declared by the Zions Board out of funds legally
available therefor. However, if Zions preferred stock is issued, the Zions
Board may grant preferential dividend rights to the holders of such stock
which would prohibit payment of dividends on Zions Common Stock unless and
until specified dividends on the preferred stock had been paid.
 
  Colorado law prohibits corporations from paying dividends when, after giving
the dividend effect, the corporation would not be able to pay its debts as
they become due in the usual course of business or the corporation's total
assets would be less than the sum of its total liabilities plus the amount
that would be needed, if the corporation were to be dissolved at the time of
the distribution, to satisfy the preferential rights upon dissolution of
shareholders whose preferential rights are superior to those of the
shareholders receiving the distribution, and allows Colorado corporations to
impose additional restrictions in its articles. The Vectra Charter places no
further restrictions on dividends. Vectra Preferred Shareholders are entitled
to receive quarterly cash dividends in the amount of $1.75 per share when, as
and if declared by the Vectra Board. Generally, if Vectra is
 
                                      51
<PAGE>
 
in default or in arrears with respect to payment of dividends declared on the
Vectra Preferred Stock or with respect to the mandatory or optional redemption
provisions of the Vectra Preferred Stock, then Vectra may not declare
dividends or otherwise make any distribution with respect to any shares of
Vectra Common Stock.
 
LIQUIDATION RIGHTS
 
  Upon liquidation, dissolution or winding up of Zions, whether voluntary or
involuntary, the holders of Zions Common Stock are entitled to share ratably
in the assets of the corporation available for distribution after all
liabilities of the corporation have been satisfied. However, if preferred
stock is issued by Zions, the Zions Board may grant preferential liquidation
rights to the holders of such stock which would entitle them to be paid out of
the assets of Zions available for distribution before any distribution is made
to the holders of Zions Common Stock.
 
  The rights of Vectra Common Shareholders in the event of a liquidation are
substantially similar to those applicable to holders of Zions Common Stock.
Under Colorado law, upon dissolution or liquidation by a court, after all
liabilities and obligations of the corporation have been satisfied, any
remaining assets or proceeds shall be distributed among its shareholders
according to their respective rights and interests. In addition, in the event
of any voluntary or involuntary liquidation, dissolution or winding up of
Vectra, the Vectra Preferred Shareholders are entitled to receive out of the
assets of Vectra before any distribution of assets is made to the Vectra
Common Shareholders an amount equal to $100 per share, plus an amount equal to
all accumulated and unpaid dividends on such shares.
 
                              DISSENTERS' RIGHTS
 
  The following is a summary of Article 113 of the CBCA and the procedures for
Vectra Preferred Shareholders dissenting from the Merger Agreement and
exercising Dissenters' Rights. This summary is qualified in its entirety by
reference to Article 113 of the CBCA, which is attached hereto as Appendix D.
Appendix D should be reviewed carefully by any Vectra Preferred Shareholders
who wish to exercise statutory dissenters' rights or who wish to preserve the
right to do so. FAILURE STRICTLY TO COMPLY WITH THE PROCEDURES SET FORTH IN
ARTICLE 113 OF THE CBCA WILL RESULT IN THE LOSS OF DISSENTERS' RIGHTS.
 
DISSENTERS' RIGHTS
 
  Under Article 113 of the CBCA ("Article 113"), if the Merger Agreement is
approved and the Merger is consummated, holders of Vectra Preferred Stock who
exercise their Dissenters' Rights in accordance with Article 113 will be
entitled to have the "fair value" of their shares paid to them in cash by
complying with the provisions of Article 113. The term "fair value" is defined
in Article 113 to mean the value of the shares immediately before the
Effective Date, excluding any appreciation or depreciation in anticipation of
the Merger except to the extent that exclusion would be inequitable. Reference
herein to "dissenters' rights" is a general reference to a shareholder's right
to dissent to the Merger and obtain payment for the shareholder's shares in
accordance with Article 113.
 
                                      52
<PAGE>
 
WHO MAY DISSENT
 
  Each Vectra Preferred Shareholder may dissent to the Merger and obtain
payment of the fair value of the shareholder's shares by following the
procedures provided in Article 113 and summarized herein. The rights of the
Vectra Preferred Shareholder may differ depending on whether the Vectra
Preferred Shareholder is a Vectra Preferred Shareholder of record holding
shares for two or more beneficial shareholders or the Vectra Preferred
Shareholder is a beneficial shareholder whose shares are held of record by one
or more record shareholders, as follows:
 
    (a) A record shareholder may assert Dissenters' Rights as to fewer than
  all the shares registered in the record shareholder's name only if the
  record shareholder dissents with respect to all shares beneficially owned
  by any one person and causes Vectra to receive written notice which states
  (1) such dissent and (2) the name, address, and federal taxpayer
  identification number, if any, of each person on whose behalf the record
  shareholder asserts dissenters' rights.
 
    (b) A beneficial shareholder may assert Dissenters' Rights as to the
  shares held on the beneficial shareholder's behalf only if (1) the
  beneficial shareholder causes Vectra to receive the record shareholder's
  written consent to the dissent not later than the time the beneficial
  shareholder asserts Dissenters' Rights, and (2) the beneficial shareholder
  dissents with respect to all shares beneficially owned by the beneficial
  shareholder.
 
  Vectra may require that, when a record shareholder dissents with respect to
the shares held by any one or more beneficial shareholders, each such
beneficial shareholder must certify to Vectra that the beneficial shareholder
and the record shareholder or record shareholders of all shares owned
beneficially by the beneficial shareholder have asserted, or will timely
assert, Dissenters' Rights as to all such shares as to which there is no
limitation on the ability to exercise Dissenter's Rights. Any such requirement
will be stated in the "Dissenters' Notice" that is referred to below.
 
REQUIREMENTS TO BE MET
 
  A Vectra Preferred Shareholder who wishes to assert Dissenters' Rights must
(a) cause Vectra to receive, before the vote is taken on the Merger Agreement,
written notice of the shareholders' intention to demand payment for the
shareholder's shares if the Merger Agreement is approved (the "Shareholder's
Notice of Intent to Dissent") and (b) not vote the shares in favor of the
Merger Agreement. A Vectra Preferred Shareholder who does not satisfy the
foregoing requirements is not entitled to demand payment for the Vectra
Preferred Shareholder's shares under Article 113.
 
NOTICE REQUIRED TO BE GIVEN BY VECTRA
 
  If the Merger Agreement is approved, Vectra will give a written dissenters'
notice (the "Dissenters' Notice") to each Vectra Preferred Shareholder who has
complied with the provisions summarized above and who is entitled to demand
payment for shares under Article 113. The Dissenters' Notice may be given
before the Effective Date of the Merger and will in any event be given no
later than ten days after the Effective Date of the Merger. The Dissenters'
Notice will (a) state that the Merger Agreement was approved and state the
Effective Date or the proposed Effective Date of the Merger; (b) state an
address at which Vectra will receive a Payment Demand (as defined below) and
the address of a place where certificates for certificated shares must be
deposited; (c) supply a Payment Demand form for demanding payment for shares,
which form will request the shareholder to state an address to which payment
is to be made; (d) set the date (the "Payment Demand Date") by which Vectra
must receive the Payment Demand and certificates for shares, which Payment
Demand Date will not be less than thirty days after the date the Dissenters'
Notice is given; (e) if Vectra has chosen to impose such a requirement, state
that, when a record shareholder dissents with respect to the shares held by
any one or more beneficial shareholders, each shareholder, and the record
shareholder or record shareholders of all shares owned beneficially by the
beneficial shareholder, have asserted, or will timely assert, Dissenter's
Rights as to all such
 
                                      53
<PAGE>
 
shares as to which there is no limitation on the ability to exercise
Dissenters' Rights; and (f) be accompanied by a copy of Article 113.
 
DISSENTER'S PROCEDURES TO DEMAND PAYMENT
 
  If the Vectra Preferred Shareholder has given a Shareholder's Notice of
Intent to Dissent in accordance with the provisions summarized above and
wishes to assert the Vectra Preferred Shareholder's Dissenters' Rights (such a
person being referred to in this summary as a "Dissenter"), the Dissenter must
(a) cause Vectra to receive a payment demand (the "Payment Demand," which may,
but need not, be on the Payment Demand form provided by Vectra with the
Dissenter's Notice), duly completed, and (b) deposit the Dissenter's
certificates for shares. A Dissenter will have all rights of a Vectra
Preferred Shareholder, except the right to transfer the shares, until the
Effective Date of the Merger but will have, after the Effective Date of the
Merger, only the right to receive payment of the shares as to which payment
has been demanded.
 
  The Payment Demand and deposit of certificates by a Dissenter will be
irrevocable unless (1) the Effective Date has not occurred within sixty days
after the Payment Demand Date, or (2) Vectra fails to make payment to the
Dissenter, within sixty days after the Payment Demand Date, of the amount
Vectra estimates to be the fair value of the Dissenter's shares, plus accrued
interest. If the Effective Date of the Merger is more than sixty days after
the Payment Demand Date, then Vectra will be required to send a new
Dissenters' Notice and the provisions summarized above will again be
applicable.
 
  If a Dissenter fails to demand payment and deposit certificates representing
the shares as to which dissent is made, as required by the Dissenter's Notice,
by the Payment Demand Date, the Dissenter will not be entitled to payment for
the shares under Article 113 and will become a shareholder in Zions as if the
Dissenter has not exercised any Dissenters' Right.
 
PAYMENT FOR SHARES
 
  Upon the Effective Date of the Merger, or upon receipt of a Payment Demand
given in accordance with the provisions of Article 113, whichever is later,
Vectra will pay each Dissenter who has complied with the requirements for
demanding payment stated in Article 113, at the address stated in the Payment
Demand, or, if no such address is stated in the Payment Demand, at the address
shown on Vectra's current record of Vectra Preferred Shareholders for the
record shareholder holding the Dissenter's shares, the amount Vectra estimates
to be the fair value of the Dissenter's shares, plus accrued interest. The
payment will be accompanied by: (a) Vectra's balance sheet, statement of
changes in shareholders' equity, statement of cash flow and other financial
statements complying with the requirements of Section 7-113-206(2)(a); (b) a
statement of Vectra's estimate of the fair value of the shares; (c) an
explanation of how the interest was calculated; (d) a statement of the
Dissenter's right to demand payment in accordance with the provisions of
Article 113 regarding the Dissenter's Responsive Notice summarized below; and
(e) a copy of Article 113.
 
FAILURE TO EFFECT MERGER
 
  If the Effective Date of the Merger does not occur within sixty days after
the Payment Demand Date, Vectra will return the deposited certificates. If the
Effective Date of the Merger occurs more than sixty days after Payment Demand
Date, then Vectra shall send a new Dissenters' Notice, as provided in Section
7-113-203, and the appropriate provisions of Article 113 shall again be
applicable.
 
SHARES ACQUIRED AFTER ANNOUNCEMENT OF MERGER AGREEMENT
 
  Vectra may, in or with the Dissenters' Notice, state the date of the first
announcement to news media or to shareholders of the terms of the Merger
Agreement (the "Announcement Date") and state that the Dissenter must certify
in writing, in or with the Payment Demand, whether or not the Dissenter (or
the person on whose behalf the Dissenter asserts Dissenters' Rights) acquired
beneficial ownership of the shares before the
 
                                      54
<PAGE>
 
Announcement Date. With respect to any Dissenter who does not so certify in
writing, in or with the Payment Demand, that the Dissenter or the person on
whose behalf the Dissenter asserts Dissenters' Rights acquired beneficial
ownership of the shares before the Announcement Date, Vectra may, in lieu of
making payment for the shares, offer to make such payment if the Dissenter
agrees to accept the payment in full satisfaction of the demand. Any such
offer will include: (A) Vectra's balance sheet, statement of changes in
shareholders' equity, statement of cash flow and other financial statements
complying with the requirements of Section 7-133-206(2)(a); (b) a statement of
Vectra's estimate of the fair value of the shares; (c) an explanation of how
the interest was calculated; (d) a statement of the Dissenter's right to
demand payment in accordance with the provisions of Article 113 regarding the
Dissenter's Responsive Notice summarized below; and (3) a copy of Article 113.
 
DISSENTER'S PROCEDURE IF DISSATISFIED WITH VECTRA PAYMENT OR OFFER
 
  A Dissenter may give notice (the "Dissenter's Response Notice") to Vectra in
writing of the Dissenter's estimate of the fair value of the Dissenter's
shares and of the amount of interest due and may demand payment of such
estimate (less any payment made by Vectra as contemplated above) or may reject
Vectra's offer made as contemplated above with respect to shares acquired
after the Announcement Date and may demand payment of the fair value of the
shares and interest due, if: (a) the Dissenter believes that the amount paid
or offered by Vectra, as the case may be, is less than the fair value of the
shares or that the interest due was incorrectly calculated; (b) Vectra fails
to make payment within sixty days after the Payment Demand Date, or (c) Vectra
does not return the deposited certificates or release the transfer
restrictions imposed on uncertificated shares as required if the Effective
Date of the Merger has not occurred within sixty days after the Payment Demand
Date. A Dissenter waives the right to demand payment as outlined above unless
the Dissenter causes Vectra to receive the Dissenter's Responsive Notice
within thirty days after Vectra made or offered payment for the Dissenter's
shares.
 
COURT ACTION FOR APPROVAL
 
  If the Dissenter's demand for payment pursuant to the Dissenter's Responsive
Notice remains unresolved, Vectra may, within sixty days after receiving the
Dissenter's Responsive Notice, commence a proceeding and petition the district
court of Denver County, Colorado to determine the fair value of the
Dissenter's shares and accrued interest. If the Dissenter's demand for payment
remains unresolved within that sixty day period and Vectra does not commence
the proceeding within that period, Vectra must pay to the Dissenter the amount
demanded in the Dissenter's Responsive Notice.
 
  Vectra shall make all Dissenters whose demands remain thus unresolved
parties to the proceeding as in an action against their shares, and all
parties shall be served with a copy of the petition in the manner provided in
Article 113. The court may appoint one or more persons as appraisers to
receive evidence and recommend a decision on the question of fair value. The
appraisers have the powers described in the order appointing them, or in any
amendment to such order. The parties to the proceeding are entitled to the
same discovery rights as parties in other civil proceedings. Each Dissenter
made a party to the proceeding will be entitled to judgment for the amount, if
any, by which the court finds the fair value of the Dissenter's shares, plus
interest, exceeds the amount paid by Vectra, or for the fair value, plus
interest, of the Dissenter's shares for which Vectra elected to withhold
payment under the provisions outlined above.
 
  The court will determine all costs of the proceeding, including the
reasonable compensation and expenses of appraisers appointed by the court, and
will assess the costs against Vectra; except that the court may assess costs
against all or some of the Dissenters, in amounts the court finds equitable,
to the extent the court finds the Dissenters acted arbitrarily, vexatiously or
not in good faith in demanding payment. The court may also assess the fees and
expenses of counsel and experts for the respective parties, in amounts the
court finds equitable, (a) against Vectra and in favor of any Dissenters if
the court finds Vectra did not substantially comply with the requirements of
part 2 of Article 113; or (b) against either Vectra or one or more Dissenters,
in favor of any other party, if the court finds that the party against whom
the fees and expenses are assessed acted arbitrarily,
 
                                      55
<PAGE>
 
vexatiously, or not in good faith with respect to the rights provided in
Article 113. If the court finds that the services of counsel for any Dissenter
were of substantial benefit to other Dissenters similarly situated, and that
the fees for those services should not be assessed against Vectra, the court
may award to said counsel reasonable fees to be paid out of the amounts
awarded to the Dissenters who were benefitted.
 
  THE ABOVE IS MERELY A SUMMARY OF ARTICLE 113 OF THE CBCA. THIS SUMMARY IS
QUALIFIED BY REFERENCE TO THOSE SECTIONS, WHICH ARE SET FORTH IN THEIR
ENTIRETY AS ANNEX D TO THIS PROXY STATEMENTCPROSPECTUS. VECTRA PREFERRED
SHAREHOLDERS DESIRING TO EXERCISE DISSENTERS' RIGHTS SHOULD REFER TO THE FULL
TEXT OF ANNEX D AND SHOULD CONSULT COUNSEL SINCE FAILURE TO COMPLY STRICTLY
WITH THE PROVISIONS OF THE STATUTE WILL RESULT IN THE LOSS OF DISSENTERS'
RIGHTS.
 
                        VALIDITY OF ZIONS COMMON STOCK
 
  The validity of the shares of Zions Common Stock to be issued in the Merger
has been passed upon by Sullivan & Cromwell, Los Angeles, California, counsel
for Zions.
 
                                    EXPERTS
 
  The consolidated financial statements of Zions as of December 31, 1996 and
1995, and for each of the years in the three year period ended December 31,
1996, incorporated by reference herein have been incorporated by reference
herein in reliance upon the report of KPMG Peat Marwick LLP, independent
certified public accountants, incorporated by reference herein, and upon the
authority of such firm as experts in accounting and auditing.
 
  The consolidated financial statements of Vectra Banking Corporation at
December 31, 1996 and 1995, and for each of the years in the three year period
ended December 31, 1996, incorporated by reference herein have been
incorporated by reference herein in reliance upon the report of KPMG Peat
Marwick LLP, independent certified public accountants, incorporated by
reference herein, and upon the authority of such firm as experts in accounting
and auditing.
 
                                      56
<PAGE>
 
                                                                      APPENDIX A
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                          AGREEMENT AND PLAN OF MERGER
 
                         DATED AS OF SEPTEMBER 23, 1997
 
                                 BY AND BETWEEN
 
                              ZIONS BANCORPORATION
 
                                      AND
 
                              VECTRA BANKING CORP.
 
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
 <C>  <S>                                                                  <C>
 RECITALS.................................................................  A-1
 
                                   ARTICLE I
 
                              CERTAIN DEFINITIONS
 
 1.01 Certain Definitions................................................   A-1
 
                                   ARTICLE II
 
                                   THE MERGER
 
 2.01 The Merger.........................................................   A-7
 2.02 Effective Date and Effective Time..................................   A-6
 2.03 Plan of Merger.....................................................   A-6
 
                                  ARTICLE III
 
                       CONSIDERATION; EXCHANGE PROCEDURES
 
 3.01 Merger Consideration...............................................   A-6
 3.02 Rights as Stockholders; Stock Transfers............................   A-6
 3.03 Fractional Shares..................................................   A-6
 3.04 Exchange Procedures................................................   A-7
 3.05 Anti-Dilution Provisions...........................................   A-8
 3.06 Options............................................................   A-8
 3.07 Warrant............................................................   A-8
 3.08 Dissenters' Rights.................................................   A-8
 
                                   ARTICLE IV
 
                          ACTIONS PENDING ACQUISITION
 
 4.01 Forebearances of Company...........................................   A-9
 4.02 Forebearances of Zions.............................................  A-11
 
                                   ARTICLE V
 
                         REPRESENTATIONS AND WARRANTIES
 
 5.01 Disclosure Schedules...............................................  A-11
 5.02 Standard...........................................................  A-11
 5.03 Representations and Warranties of Company..........................  A-11
 5.04 Representations and Warranties of Zions............................  A-18
 
                                   ARTICLE VI
 
                                   COVENANTS
 
 6.01 Reasonable Best Efforts............................................  A-19
 6.02 Stockholder Approval...............................................  A-19
 6.03 Registration Statement.............................................  A-19
 6.04 Press Releases.....................................................  A-20
 6.05 Access; Information................................................  A-20
</TABLE>
 
                                       i
<PAGE>
 
                         TABLE OF CONTENTS--(CONTINUED)
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
 <C>  <S>                                                                   <C>
 6.06 Acquisition Proposals...............................................  A-21
 6.07 Affiliate Agreements................................................  A-21
 6.08 Takeover Laws.......................................................  A-21
 6.09 Certain Policies....................................................  A-21
 6.10 NASDAQ Listing......................................................  A-21
 6.11 Regulatory Applications.............................................  A-22
 6.12 Indemnification; Director and Officers' Insurance...................  A-22
 6.13 Benefit Plans.......................................................  A-23
 6.14 Accountants' Letters................................................  A-23
 6.15 Notification of Certain Matters.....................................  A-23
 6.16 Conversion of Company Convertible Stock and Exercise of Warrant.....  A-23
 6.17 Shareholder Agreements..............................................  A-23
 
                                  ARTICLE VII
 
                    CONDITIONS TO CONSUMMATION OF THE MERGER
 
 7.01 Conditions to Each Party's Obligation to Effect the Merger..........  A-24
 7.02 Conditions to Obligation of Company.................................  A-24
 7.03 Conditions to Obligation of Zions...................................  A-25
 
                                  ARTICLE VIII
 
                                  TERMINATION
 
 8.01 Termination.........................................................  A-26
 8.02 Effect of Termination and Abandonment...............................  A-27
 
                                   ARTICLE IX
 
                                 MISCELLANEOUS
 
 9.01 Survival............................................................  A-27
 9.02 Waiver; Amendment...................................................  A-27
 9.03 Counterparts........................................................  A-27
 9.04 Governing Law; Waiver of Jury Trial.................................  A-27
 9.05 Expenses............................................................  A-27
 9.06 Notices.............................................................  A-28
 9.07 Entire Understanding; No Third Party Beneficiaries..................  A-28
 9.08 Interpretation; Effect..............................................  A-28
</TABLE>
 
EXHIBIT A Form of Affiliate Agreement
EXHIBIT B Form of Shareholder's Agreement
 
                                       ii
<PAGE>
 
  AGREEMENT AND PLAN OF MERGER, dated as of September 23, 1997 (this
"Agreement"), by and between Vectra Banking Corp. ("Company") and Zions
Bancorporation ("Zions").
 
                                   RECITALS
 
  A. Vectra Banking Corp. Vectra Banking Corp. is a Colorado corporation,
having its principal place of business in Denver, Colorado.
 
  B. Zions Bancorporation. Zions Bancorporation is a Utah corporation, having
its principal place of business in Salt Lake City, Utah.
 
  C. Stock Option Agreement. Concurrently herewith, Company and Zions are
entering into a stock option agreement (the "Stock Option Agreement"), to be
dated the date hereof, whereby Company will grant to Zions the option to
purchase up to 19.9% of the outstanding shares of the Company Common Stock
upon the occurrence of certain events.
 
  D. Intentions of the Parties. It is the intention of the parties to this
Agreement that the business combination contemplated hereby be accounted for
under the "pooling-of-interests" accounting method and be treated as a
"reorganization" under Section 368 of the Internal Revenue Code of 1986 as
amended (the "Code").
 
  E. Board Action. The respective Boards of Directors of each of Zions and
Company have determined that it is in the best interests of their respective
companies and their stockholders to consummate the strategic business
combination transaction provided for herein.
 
  NOW, THEREFORE, in consideration of the premises and of the mutual
covenants, representations, warranties and agreements contained herein, the
parties agree as follows:
 
                                   ARTICLE I
 
                              CERTAIN DEFINITIONS
 
  1.01 Certain Definitions. The following terms are used in this Agreement
with the meanings set forth below:
 
  "Acquisition Proposal" means any tender or exchange offer, proposal for a
merger, consolidation or other business combination involving Company or any
of its Subsidiaries or any proposal or offer to acquire in any manner a
substantial equity interest in, or a substantial portion of the assets or
deposits of, Company or any of its Subsidiaries, other than the transactions
contemplated by this Agreement.
 
  "Agreement" means this Agreement, as amended or modified from time to time
in accordance with Section 9.02.
 
  "Average Closing Price" means the average of the daily closing prices of
Zions Common Stock on NASDAQ (as reported in The Wall Street Journal or, if
not reported therein, in another mutually agreed upon authoritative source)
for the fifteen consecutive full trading days in which such shares are traded
on NASDAQ ending at the close of trading on the Determination Date.
 
  "Benefit Plans" has the meaning set forth in Section 5.03(m).
 
  "Business Combination" has the meaning set forth in Section 3.05.
 
  "CBCA" means the Colorado Business Corporation Act.
 
                                      A-1
<PAGE>
 
  "Code" has the meaning set forth in the recitals.
 
  "Colorado Secretary" means the Colorado Secretary of State.
 
  "Common Exchange Ratio" has the meaning set forth in Section 3.01.
 
  "Company" has the meaning set forth in the preamble to this Agreement.
 
  "Company Affiliate" has the meaning set forth in Section 6.07(a).
 
  "Company Board" means the Board of Directors of Company.
 
  "Company Bank" means Vectra Bank, a Colorado banking corporation and a
wholly owned subsidiary of Company.
 
  "Company By-Laws" means the By-laws of Company.
 
  "Company Certificate" means the Amended and Restated Articles of
Incorporation of Company.
 
  "Company Common Stock" means the common stock, par value $.01 per share, of
Company.
 
  "Company Convertible Preferred Stock" means the Convertible Preferred Stock,
par value $0.10 per share, of Company.
 
  "Company Meeting" has the meaning set forth in Section 6.02.
 
  "Company Stock" means, collectively, Company Common Stock and Company
Convertible Preferred Stock.
 
  "Company Stock Option" has the meaning set forth in Section 3.06.
 
  "Company Stock Plans" means the Employees' Equity Incentive Plan, the
Nonemployee Directors' Stock Option Plan, the 1989 Non-Statutory Stock Option
Plan and the Incentive Stock Purchase Plan.
 
  "Corporation Division" has the meaning set forth in Section 2.01(b).
 
  "Costs" has the meaning set forth in Section 6.12(a).
 
  "Covered Transactions" has the meaning set forth in Section 5.03(o).
 
  "Determination Date" means the date that is five NASDAQ trading days prior
to the Effective Date.
 
  "Disclosure Schedule" has the meaning set forth in Section 5.01.
 
  "Dissenters' Preferred Shares" has the meaning set forth in Section 3.01(b).
 
  "Dissenting Preferred Shareholder" has the meaning set forth in Section
3.01(b).
 
  "DOL" has the meaning set forth in Section 5.03(m).
 
  "Effective Date" means the date on which the Effective Time occurs.
 
  "Effective Time" means the effective time of the Merger, as provided for in
Section 2.02.
 
  "Employees" has the meaning set forth in Section 5.03(m).
 
  "Environmental Law" has the meaning set forth in Section 5.03(p).
 
                                      A-2
<PAGE>
 
  "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.
 
  "ERISA Affiliate" has the meaning set forth in Section 5.03(m).
 
  "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
the rules and regulations thereunder.
 
  "Exchange Agent" has the meaning set forth in Section 3.04.
 
  "Exchange Fund" has the meaning set forth in Section 3.04.
 
  "FDIC" means the Federal Deposit Insurance Corporation.
 
  "Federal Reserve" means the Board of Governors of the Federal Reserve
System.
 
  "Governmental Authority" means any court, administrative agency or
commission or other federal, state or local governmental authority or
instrumentality.
 
  "Hazardous Substance" has the meaning set forth in Section 5.03(p).
 
  "Indemnified Party" has the meaning set forth in Section 6.12(a).
 
  "Index Ratio" has the meaning set forth in Section 8.01(f).
 
  "Insurance Policy" has the meaning set forth in Section 5.03(t).
 
  "KBW Average Index" means the average of the KBW Index for the ten
consecutive full New York Stock Exchange trading days ending on the
Determination Date.
 
  "KBW Index" means the KBW 50 Index of Keefe, Bruyette & Woods, Inc. (as
provided by Keefe, Bruyette & Woods, Inc. upon request).
 
  "KBW Starting Index" means the average of the KBW Index for the ten
consecutive full New York Stock Exchange trading days commencing on the day
five full New York Stock Exchange trading days before the first public
announcement of the Merger.
 
  "Liens" means any charge, mortgage, pledge, security interest, restriction,
claim, lien or encumbrance.
 
  "Material Adverse Effect" means, with respect to Zions or Company, any
effect that (i) is material and adverse to the financial position, results of
operations or business of Zions and its Subsidiaries taken as a whole or
Company and its Subsidiaries taken as a whole, respectively, or (ii) would
materially impair the ability of either Zions or Company to perform its
obligations under this Agreement or otherwise materially threaten or
materially impede the consummation of the Merger and the other transactions
contemplated by this Agreement; provided, however, that Material Adverse
Effect shall not be deemed to include the impact of (a) changes in banking and
similar laws of general applicability or interpretations thereof by courts or
governmental authorities, (b) changes in generally accepted accounting
principles or regulatory accounting requirements applicable to banks and their
holding companies generally and (c) any modifications or changes to valuation
policies and practices in connection with the Merger or restructuring charges
taken in connection with the Merger, in each case in accordance with generally
accepted accounting principles.
 
  "Maximum Amount" has the meaning set forth in Section 6.12(c).
 
  "Merger" has the meaning set forth in Section 2.01.
 
  "Merger Consideration" has the meaning set forth in Section 2.01.
 
                                      A-3
<PAGE>
 
  "Multiemployer Plans" has the meaning set forth in Section 5.03(m).
 
  "NASDAQ" means The Nasdaq Stock Market, Inc.'s National Market System.
 
  "New Certificate" has the meaning set forth in Section 3.04.
 
  "Old Certificate" has the meaning set forth in Section 3.04.
 
  "Person" means any individual, bank, corporation, partnership, association,
joint-stock company, business trust or unincorporated organization.
 
  "Pension Plan" has the meaning set forth in Section 5.03(m).
 
  "Plans" has the meaning set forth in Section 5.03(m).
 
  "Preferred Exchange Ratio" has the meaning set forth in Section 3.01.
 
  "Previously Disclosed" by a party shall mean information set forth in its
Disclosure Schedule.
 
  "Proxy Statement" has the meaning set forth in Section 6.03.
 
  "Registration Statement" has the meaning set forth in Section 6.03.
 
  "Regulatory Authority" has the meaning set forth in Section 5.03(i).
 
  "Replacement Option" has the meaning set forth in Section 3.06.
 
  "Replacement Warrant" has the meaning specified in Section 3.07.
 
  "Representatives" means, with respect to any Person, such Person's
directors, officers, employees, legal or financial advisors or any
representatives of such legal or financial advisors.
 
  "Rights" means, with respect to any Person, securities or obligations
convertible into or exercisable or exchangeable for, or giving any person any
right to subscribe for or acquire, or any options, calls or commitments
relating to, or any stock appreciation right or other instrument the value of
which is determined in whole or in part by reference to the market price or
value of, shares of capital stock of such Person.
 
  "SEC" means the Securities and Exchange Commission.
 
  "SEC Documents" has the meaning set forth in Section 5.03(g).
 
  "Securities Act" means the Securities Act of 1933, as amended, and the rules
and regulations thereunder.
 
  "Shareholder Agreements" has the meaning set forth in Section 6.17.
 
  "Starting Price" means the average of the closing price for Zions Common
Stock as reported on NASDAQ (as reported in The Wall Street Journal or, if not
reported therein, in another mutually agreed upon authoritative source) for
the ten consecutive full trading days on which such shares are traded on
NASDAQ commencing on the day five full NASDAQ trading days before the first
public announcement of the Merger.
 
  "Stock Option Agreement" has the meaning set forth in the Recitals.
 
  "Subsidiary" and "Significant Subsidiary" have the meanings ascribed to them
in Rule 1-02 of Regulation S-X of the SEC.
 
  "Surviving Corporation" has the meaning set forth in Section 2.01.
 
                                      A-4
<PAGE>
 
  "Takeover Laws" has the meaning set forth in Section 5.03(o).
 
  "Tax" and "Taxes" means all federal, state, local or foreign taxes, charges,
fees, levies or other assessments, however denominated, including, without
limitation, all net income, gross income, gains, gross receipts, sales, use,
ad valorem, goods and services, capital, production, transfer, franchise,
windfall profits, license, withholding, payroll, employment, disability,
employer health, excise, estimated, severance, stamp, occupation, property,
environmental, unemployment or other taxes, custom duties, fees, assessments
or charges of any kind whatsoever, together with any interest and any
penalties, additions to tax or additional amounts imposed by any taxing
authority whether arising before, on or after the Effective Date.
 
  "Tax Returns" means any return, amended return or other report (including
elections, declarations, disclosures, schedules, estimates and information
returns) required to be filed with respect to any Tax.
 
  "Treasury Stock" shall mean shares of Company Stock held by Company or any
of its Subsidiaries or by Zions or any of its Subsidiaries, in each case other
than in a fiduciary (including custodial or agency) capacity or as a result of
debts previously contracted in good faith.
 
  "UBCA" means the Utah Business Corporation Act.
 
  "Warrant" means the warrant issued to the underwriter in Company's initial
public offering in 1994.
 
  "Zions" has the meaning set forth in the preamble to this Agreement.
 
  "Zions Board" means the Board of Directors of Zions.
 
  "Zions Common Stock" means the common stock, no par value per share, of
Zions together with any rights attached thereto under or by virtue of the
Shareholder Protection Rights Agreement, dated September 27, 1996, between
Zions and Zions First National Bank, as rights agent.
 
  "Zions Preferred Stock" means the preferred stock, no par value per share,
of Zions.
 
  "Zions Ratio" has the meaning set forth in Section 8.01(f).
 
                                  ARTICLE II
 
                                  THE MERGER
 
  2.01 The Merger. (a) At the Effective Time, Company shall merge with and
into Zions (the "Merger"), the separate corporate existence of Company shall
cease and Zions shall survive and continue to exist as a Utah corporation
(Zions, as the surviving corporation in the Merger, sometimes being referred
to herein as the "Surviving Corporation"). Zions may at any time prior to the
Effective Time change the method of effecting the combination with Company
(including, without limitation, the provisions of this Article II) if and to
the extent it deems such change to be necessary, appropriate or desirable;
provided, however, that no such change shall (i) alter or change the amount or
kind of consideration to be issued to holders of Company Stock as provided for
in this Agreement (the "Merger Consideration"), (ii) adversely affect the tax
treatment of Company's stockholders as a result of receiving the Merger
Consideration or (iii) materially impede or delay consummation of the
transactions contemplated by this Agreement.
 
  (b) Subject to the satisfaction or waiver of the conditions set forth in
Article VII, the Merger shall become effective upon the occurrence of the
filing in the office of the Utah Division of Corporation and Commercial Code
(the "Corporation Division") of articles of merger in accordance with Section
16-10a-1105 of the UBCA and the filing in the office of the Colorado Secretary
of articles of merger in accordance with Section 7-111-105 of the CBCA or such
later date and time as may be set forth in such articles and the issuance of
certificates of merger by the Corporation Division and the Colorado Secretary
under the UBCA and the CBCA, respectively. The Merger shall have the effects
prescribed in the UBCA and the CBCA.
 
                                      A-5
<PAGE>
 
  (c) Articles of Incorporation and By-Laws. The articles of incorporation and
by-laws of Zions immediately after the Merger shall be those of Zions as in
effect immediately prior to the Effective Time.
 
  (d) Directors and Officers of the Surviving Corporation. The directors and
officers of Zions immediately after the Merger shall be the directors and
officers of Zions immediately prior to the Effective Time, until such time as
their successors shall be duly elected and qualified.
 
  2.02 Effective Date and Effective Time. On such date as Zions selects (and
promptly provides notice thereof to the Company), which shall be within ten
days after the last to occur of the expiration of all applicable waiting
periods in connection with approvals of governmental authorities and the
receipt of all approvals of governmental authorities and all conditions to the
consummation of the Merger are satisfied or waived, or on such earlier or
later date as may be agreed in writing by the parties, articles of merger
shall be executed in accordance with all appropriate legal requirements and
shall be filed as required by law, and the Merger provided for herein shall
become effective upon such filing or on such date as may be specified in such
articles of merger. The date of such filing or such later effective date is
herein called the "Effective Date". The "Effective Time" of the Merger shall
be the time of such filing or as set forth in such articles of merger.
 
  2.03 Plan of Merger. At the request of Zions, Zions and Company shall enter
into a separate plan of merger or articles of merger reflecting the terms
hereof for purposes of any filing requirement of the CBCA or UBCA.
 
                                  ARTICLE III
 
                      CONSIDERATION; EXCHANGE PROCEDURES
 
  3.01 Merger Consideration. Subject to the provisions of this Agreement, at
the Effective Time, automatically by virtue of the Merger and without any
action on the part of any Person:
 
    (a) Outstanding Company Common Stock. Each share, excluding Treasury
  Stock, of Company Common Stock issued and outstanding immediately prior to
  the Effective Time shall become and be converted into 0.685 of a share of
  Zions Common Stock (the "Common Exchange Ratio"). The Common Exchange Ratio
  shall be subject to adjustment as set forth in Sections 3.05 and 8.01(f).
 
    (b) Outstanding Company Convertible Preferred Stock. Each share,
  excluding (i) Treasury Stock and (ii) shares held by holders (each, a
  "Dissenting Preferred Shareholder") who perfect their rights to dissent
  under the CBCA (the "Dissenters' Preferred Shares"), of Company Convertible
  Preferred Stock issued and outstanding immediately prior to the Effective
  Time shall become and be converted into 7.755 shares of Zions Common Stock
  (the "Preferred Exchange Ratio"). The Preferred Exchange Ratio shall be
  subject to adjustment as set forth in Sections 3.05 and 8.01(f).
 
    (c) Outstanding Zions Stock. Each share of Zions Common Stock issued and
  outstanding immediately prior to the Effective Time shall remain issued and
  outstanding and unaffected by the Merger.
 
    (d) Treasury Shares. Each share of Company Stock held as Treasury Stock
  immediately prior to the Effective Time shall be canceled and retired at
  the Effective Time and no consideration shall be issued in exchange
  therefor.
 
  3.02 Rights as Stockholders; Stock Transfers. At the Effective Time, holders
of Company Stock shall cease to be, and shall have no rights as, stockholders
of Company, other than to receive any dividend or other distribution with
respect to such Company Stock with a record date occurring prior to the
Effective Time and the consideration provided under this Article III. After
the Effective Time, there shall be no transfers on the stock transfer books of
Company or the Surviving Corporation of shares of Company Stock.
 
  3.03 Fractional Shares. Notwithstanding any other provision hereof, no
fractional shares of Zions Common Stock and no certificates or scrip therefor,
or other evidence of ownership thereof, will be issued in the
 
                                      A-6
<PAGE>
 
Merger; instead, Zions shall pay to each holder of Company Stock who would
otherwise be entitled to a fractional share of Zions Common Stock (after
taking into account all Old Certificates delivered by such holder) an amount
in cash (without interest) determined by multiplying such fraction by the
average of the closing prices of Zions Common Stock, as reported on NASDAQ (as
reported in The Wall Street Journal or, if not reported therein, in another
authoritative source), for the five NASDAQ trading days immediately preceding
the Effective Date.
 
  3.04 Exchange Procedures. (a) At or prior to the Effective Time, Zions shall
deposit, or shall cause to be deposited, with such bank or trust company as
Zions shall elect (in such capacity, the "Exchange Agent"), for the benefit of
the holders of certificates formerly representing shares of Company Stock
("Old Certificates"), for exchange in accordance with this Article III,
certificates representing the shares of Zions Common Stock ("New
Certificates") and an estimated amount of cash (such cash and New
Certificates, together with any dividends or distributions with a record date
occurring after the Effective Date with respect thereto (without any interest
on any such cash, dividends or distributions), being hereinafter referred to
as the "Exchange Fund") to be paid pursuant to this Article III in exchange
for outstanding shares of Company Stock.
 
  (b) As soon as practicable after the Effective Date but not more than five
business days thereafter, Zions shall send or cause to be sent to each former
holder of record of shares of Company Stock immediately prior to the Effective
Time transmittal materials for use in exchanging such stockholder's Old
Certificates for the consideration set forth in this Article III. Zions shall
cause the New Certificates into which shares of a stockholder's Company Stock
are converted on the Effective Date and/or any check in respect of any
fractional share interests or dividends or distributions which such person
shall be entitled to receive to be delivered to such stockholder upon delivery
to the Exchange Agent of Old Certificates representing such shares of Company
Stock (or an affidavit of lost certificate and, if required by the Exchange
Agent, indemnity reasonably satisfactory to Zions and the Exchange Agent, if
any of such certificates are lost, stolen or destroyed) owned by such
stockholder. No interest will be paid on any such cash to be paid in lieu of
fractional share interests or in respect of dividends or distributions which
any such person shall be entitled to receive pursuant to this Article III upon
such delivery. In the event of a transfer of ownership of any shares of
Company Stock not registered in the transfer records of Company, the exchange
described in this Section 3.04(b) may nonetheless be effected and a check for
the cash to be paid in lieu of fractional shares may be issued to the
transferee if the Old Certificate representing such Company Stock is presented
to the Exchange Agent, accompanied by documents sufficient, in the discretion
of Zions and the Exchange Agent, (i) to evidence and effect such transfer but
for the provisions of Section 3.02 hereof and (ii) to evidence that all
applicable stock transfer taxes have been paid.
 
  (c) If Old Certificates are not surrendered or the consideration therefor is
not claimed prior to the date on which such consideration would otherwise
escheat to or become the property of any governmental unit or agency, the
unclaimed consideration shall, to the extent permitted by abandoned property
and any other applicable law, become the property of the Surviving Corporation
(and to the extent not in its possession shall be paid over to the Surviving
Corporation), free and clear of all claims or interest of any person
previously entitled to such claims. Notwithstanding the foregoing, neither the
Exchange Agent nor any party hereto shall be liable to any former holder of
Company Stock for any amount properly delivered to a public official pursuant
to applicable abandoned property, escheat or similar laws.
 
  (d) At the election of Zions, no dividends or other distributions with
respect to Zions Common Stock with a record date occurring after the Effective
Time shall be paid to the holder of any unsurrendered Old Certificate
representing shares of Company Stock converted in the Merger into the right to
receive shares of such Zions Stock until the holder thereof shall be entitled
to receive New Certificates in exchange therefor in accordance with the
procedures set forth in this Section 3.04, and no such shares of Company
Common Stock shall be eligible to vote until the holder of Old Certificates is
entitled to receive New Certificates in accordance with the procedures set
forth in this Section 3.04. After becoming so entitled in accordance with this
Section 3.04, the record holder thereof also shall be entitled to receive any
such dividends or other distributions, without any interest thereon, which
theretofore had become payable with respect to shares of Zions Common Stock
such holder had the right to receive upon surrender of the Old Certificate.
 
                                      A-7
<PAGE>
 
  (e) Any portion of the Exchange Fund that remains unclaimed by the
stockholders of Company for six months after the Effective Time shall be
returned by the Exchange Agent to Zions. Any stockholders of Company who have
not theretofore complied with this Article III shall thereafter look only to
Zions for payment of the shares of Zions Common Stock, cash in lieu of any
fractional shares and unpaid dividends and distributions on Zions Common Stock
deliverable in respect of each share of Company Stock such stockholder holds
as determined pursuant to this Agreement, in each case, without any interest
thereon.
 
  3.05 Anti-Dilution Provisions. In the event Zions changes (or establishes a
record date for changing) the number of shares of Zions Common Stock issued
and outstanding prior to the Effective Date as a result of a stock split,
stock dividend, recapitalization or similar transaction with respect to the
outstanding Zions Common Stock and the record date therefor shall be prior to
the Effective Date, the Exchange Ratio shall be proportionately adjusted. If,
between the date hereof and the Effective Time, Zions shall consolidate with
or into any other corporation (a "Business Combination") and the terms thereof
shall provide that Zions Common Stock shall be converted into or exchanged for
the shares of any other corporation or entity, then provision shall be made as
part of the terms of such Business Combination so that (i) shareholders of
Company who would be entitled to receive shares of Zions Common Stock pursuant
to this Agreement shall be entitled to receive, in lieu of each share of Zions
Common Stock issuable to such shareholders as provided herein, the same kind
and amount of securities or assets as shall be distributable upon such
Business Combination with respect to one share of Zions Common Stock.
 
  3.06 Options. At the Effective Time, each outstanding option to purchase
shares of Company Common Stock under the Company Stock Plans (each, a "Company
Stock Option"), whether vested or unvested, shall be converted into an option
to acquire, on the same terms and conditions as were applicable under such
Company Stock Option, the number of shares of Zions Common Stock equal to (a)
the number of shares of Company Common Stock subject to the Company Stock
Option, multiplied by (b) the Common Exchange Ratio (such product rounded down
to the nearest whole number) (a "Replacement Option"), at an exercise price
per share (rounded down to the nearest whole cent) equal to (y) the aggregate
exercise price for the shares of Company Common Stock which were purchasable
pursuant to such Company Stock Option divided by (z) the number of full shares
of Zions Common Stock subject to such Replacement Option in accordance with
the foregoing. Notwithstanding the foregoing, each Company Stock Option which
is intended to be an "incentive stock option" (as defined in Section 422 of
the Code) shall be adjusted in accordance with the requirements of Section 424
of the Code. At or prior to the Effective Time, Company shall take all action,
if any, necessary with respect to the Company Stock Plans to permit the
replacement of the outstanding Company Stock Options by Zions pursuant to this
Section. At the Effective Time, Zions shall assume the Company Stock Plans;
provided, that such assumption shall be only in respect of the Replacement
Options and that Zions shall have no obligation with respect to any awards
under the Company Stock Plans other than the Replacement Options and shall
have no obligation to make any additional grants or awards under such assumed
Company Stock Plans.
 
  3.07 Warrant. At the Effective Time, the unexercised portion of the Warrant,
if any, shall be converted into a warrant (the "Replacement Warrant") to
acquire, on the same terms and conditions as were applicable under the
Warrant, the number of shares of Zions Common Stock equal to (a) the number of
shares of Company Common Stock subject to the Warrant, multiplied by (b) the
Common Exchange Ratio (such product rounded down to the nearest whole number),
at an exercise price per share (rounded down to the nearest whole cent) equal
to (y) the aggregate exercise price for the shares of Company Common Stock
that were purchasable pursuant to the Warrant divided by (z) the full number
of shares of Zions Common Stock subject to the Replacement Warrant in
accordance with the foregoing.
 
  3.08 Dissenters' Rights. Any Dissenting Preferred Shareholder who shall be
entitled to be paid the "fair value" of his or her Dissenters' Preferred
Shares, as provided in Section 7-113-102 of the CBCA, shall not be entitled to
the merger consideration in respect thereof provided for under Section 3.01(b)
unless and until such Dissenting Preferred Shareholder shall have failed to
perfect or shall have effectively withdrawn or lost such Dissenting Preferred
Shareholder's right to dissent from the Merger under the CBCA, and shall be
entitled to receive only the payment provided for by Section 7-113-102 of the
CBCA with respect to such Dissenters'
 
                                      A-8
<PAGE>
 
Preferred Shares. If any Dissenting Preferred Shareholder shall fail to
perfect or shall have effectively withdrawn or lost such right to dissent, the
Dissenters' Preferred Shares held by such Dissenting Preferred Shareholder
shall thereupon be treated as though such Dissenters' Preferred Shares had
been converted into the right to receive the merger consideration pursuant to
Section 3.01(b) hereof.
 
                                  ARTICLE IV
 
                          ACTIONS PENDING ACQUISITION
 
  4.01 Forebearances of Company. From the date hereof until the Effective
Time, except as expressly contemplated by this Agreement, without the prior
written consent of Zions, Company will not, and will cause each of its
Subsidiaries not to:
 
    (a) Ordinary Course. Conduct the business of Company and its Subsidiaries
  other than in the ordinary and usual course or fail to use reasonable best
  efforts to preserve intact their business organizations and assets and
  maintain their rights, franchises and existing relations with customers,
  suppliers, employees and business associates, take any action that would
  adversely affect or delay the ability of Company, Zions or any of their
  Subsidiaries to perform any of their obligations on a timely basis under
  this Agreement, or take any action that is reasonably likely to have a
  Material Adverse Effect on the Company or its Subsidiaries, taken as a
  whole.
 
    (b) Capital Stock. Other than pursuant to Rights Previously Disclosed,
  (i) issue, sell or otherwise permit to become outstanding, or authorize the
  creation of, any additional shares of Company Stock or any Rights, (ii)
  enter into any agreement with respect to the foregoing or (iii) permit any
  additional shares of Company Stock to become subject to new grants of
  employee or director stock options, other Rights or similar stock-based
  employee rights.
 
    (c) Dividends, Etc. (a) Make, declare, pay or set aside for payment any
  dividend (other than (A) quarterly cash dividends on Company Convertible
  Preferred Stock in an amount not to exceed $1.75 per share with record and
  payment dates consistent with past practice, (B) dividends from wholly
  owned Subsidiaries to Company or another wholly owned Subsidiary of Company
  and (C) dividends required to be paid by VBC Capital I pursuant to the
  terms of its 9.5% Cumulative Capital Securities issued in April 1997) on or
  in respect of, or declare or make any distribution on any shares of Company
  Stock or (b) directly or indirectly adjust, split, combine, redeem,
  reclassify, purchase or otherwise acquire, any shares of its capital stock.
 
    (d) Compensation; Employment Agreements; Etc. Enter into or amend or
  renew any employment, consulting, severance or similar agreements or
  arrangements with any director, officer or employee of Company or its
  Subsidiaries, or grant any salary or wage increase or increase any employee
  benefit (including incentive or bonus payments), except (i) for normal
  individual increases in compensation to employees in the ordinary course of
  business consistent with past practice, (ii) for other changes that are
  required by applicable law, (iii) to satisfy Previously Disclosed
  contractual obligations existing as of the date hereof or (iv) for grants
  of awards to newly hired employees consistent with past practice.
 
    (e) Benefit Plans. Enter into, establish, adopt or amend (except (i) as
  may be required by applicable law or (ii) to satisfy Previously Disclosed
  contractual obligations existing as of the date hereof) any pension,
  retirement, stock option, stock purchase, savings, profit sharing, deferred
  compensation, consulting, bonus, group insurance or other employee benefit,
  incentive or welfare contract, plan or arrangement, or any trust agreement
  (or similar arrangement) related thereto, in respect of any director,
  officer or employee of Company or its Subsidiaries, or take any action to
  accelerate the vesting or exercisability of stock options, restricted stock
  or other compensation or benefits payable thereunder.
 
                                      A-9
<PAGE>
 
    (f) Dispositions. Except as Previously Disclosed, sell, transfer,
  mortgage, encumber or otherwise dispose of or discontinue any of its
  assets, deposits, business or properties except in the ordinary course of
  business and in a transaction that is not material to it and its
  Subsidiaries taken as a whole.
 
    (g) Acquisitions. Except as Previously Disclosed, acquire (other than by
  way of foreclosures or acquisitions of control in a bona fide fiduciary
  capacity or in satisfaction of debts previously contracted in good faith,
  in each case in the ordinary and usual course of business consistent with
  past practice) all or any portion of, the assets, business, deposits or
  properties of any other entity except in the ordinary course of business
  consistent with past practice and in a transaction that is not material to
  the Company and its Subsidiaries, taken as a whole.
 
    (h) Capital Expenditures. Except as Previously Disclosed, make any
  capital expenditures other than capital expenditures in the ordinary course
  of business consistent with past practice in amounts not exceeding $50,000
  individually or $250,000 in the aggregate.
 
    (i) Governing Documents. Amend the Company Certificate, Company By-Laws
  or the certificate of incorporation or by-laws (or similar governing
  documents) of any of Company's Subsidiaries.
 
    (j) Accounting Methods. Implement or adopt any change in its accounting
  principles, practices or methods, other than as may be required by
  generally accepted accounting principles.
 
    (k) Contracts. Except in the ordinary course of business consistent with
  past practice, enter into or terminate any material contract (as defined in
  Section 5.03(k)) or amend or modify in any material respect any of its
  existing material contracts.
 
    (l) Claims. Except in the ordinary course of business consistent with
  past practice, settle any claim, action or proceeding, except for any
  claim, action or proceeding involving solely money damages in an amount,
  individually or in the aggregate for all such settlements, that is not
  material to Company and its Subsidiaries, taken as a whole.
 
    (m) Adverse Actions. (a) Take any action while knowing that such action
  would, or is reasonably likely to, prevent or impede the Merger from
  qualifying (i) for "pooling of interests" accounting treatment or (ii) as a
  reorganization within the meaning of Section 368 of the Code; or (b)
  knowingly take any action that is intended or is reasonably likely to
  result in (i) any of its representations and warranties set forth in this
  Agreement being or becoming untrue in any material respect at any time at
  or prior to the Effective Time, (ii) any of the conditions to the Merger
  set forth in Article VII not being satisfied or (iii) a material violation
  of any provision of this Agreement except, in each case, as may be required
  by applicable law or regulation.
 
    (n)  Risk Management. Except as required by applicable law or regulation,
  (i) implement or adopt any material change in its interest rate and other
  risk management policies, procedures or practices; (ii) fail to follow its
  existing policies or practices with respect to managing its exposure to
  interest rate and other risk; or (iii) fail to use commercially reasonable
  means recommended by Zions, to avoid any material increase in its aggregate
  exposure to interest rate risk.
 
    (o) Indebtedness. Incur any indebtedness for borrowed money other than in
  the ordinary course of business consistent with past practice.
 
    (p) Commitments. Agree or commit to do any of the foregoing.
 
                                     A-10
<PAGE>
 
  4.02 Forebearances of Zions. From the date hereof until the Effective Time,
except as expressly contemplated by this Agreement, without the prior written
consent of the Company, Zions will not, and will cause each of its
Subsidiaries not to:
 
    (a) Ordinary Course. Take any action that would adversely affect or delay
  the ability of Company or Zions to perform any of their obligations on a
  timely basis under this Agreement, or take any action that is reasonably
  likely to have a Material Adverse Effect on Zions or its Subsidiaries,
  taken as a whole.
 
    (b) Adverse Actions. (a) Take any action while knowing that such action
  would, or is reasonably likely to, prevent or impede the Merger from
  qualifying (i) for "pooling of interests" accounting treatment or (ii) as a
  reorganization within the meaning of Section 368 of the Code; or (b)
  knowingly take any action that is intended or is reasonably likely to
  result in (i) any of its representations and warranties set forth in this
  Agreement being or becoming untrue in any material respect at any time at
  or prior to the Effective Time, (ii) any of the conditions to the Merger
  set forth in Article VII not being satisfied or (iii) a material violation
  of any provision of this Agreement except, in each case, as may be required
  by applicable law or regulation.
 
                                   ARTICLE V
 
                        REPRESENTATIONS AND WARRANTIES
 
  5.01 Disclosure Schedules. On or prior to the date hereof, Zions has
delivered to Company a schedule and Company has delivered to Zions a schedule
(respectively, its "Disclosure Schedule") setting forth, among other things,
items the disclosure of which is necessary or appropriate either in response
to an express disclosure requirement contained in a provision hereof or as an
exception to one or more representations or warranties contained in Section
5.03 or 5.04; provided, that (a) no such item is required to be set forth in a
Disclosure Schedule as an exception to a representation or warranty if its
absence would not be reasonably likely to result in the related representation
or warranty being deemed untrue or incorrect under the standard established by
Section 5.02, and (b) the mere inclusion of an item in a Disclosure Schedule
as an exception to a representation or warranty shall not be deemed an
admission by a party that such item represents a material exception or fact,
event or circumstance or that such item is reasonably likely to result in a
Material Adverse Effect.
 
  5.02 Standard. No representation or warranty of Company or Zions contained
in Section 5.03 or 5.04 shall be deemed untrue or incorrect, and no party
hereto shall be deemed to have breached a representation or warranty, as a
consequence of the existence of any fact, event or circumstance unless such
fact, circumstance or event, individually or taken together with all other
facts, events or circumstances inconsistent with any representation or
warranty contained in Section 5.03 or 5.04 has had or is reasonably likely to
have a Material Adverse Effect on the party making such representation or
warranty.
 
  5.03 Representations and Warranties of Company. Subject to Sections 5.01 and
5.02 and except as Previously Disclosed in a paragraph of its Disclosure
Schedule corresponding to the relevant paragraph below, Company hereby
represents and warrants to Zions:
 
    (a) Organization, Standing and Authority. Company is a corporation duly
  organized, validly existing and in good standing under the laws of the
  State of Colorado. Company is duly qualified to do business and is in good
  standing in the states of the United States and any foreign jurisdictions
  where its ownership or leasing of property or assets or the conduct of its
  business requires it to be so qualified.
 
    (b) Company Stock. As of the date hereof, the authorized capital stock of
  Company consists solely of (i) 25,000,000 shares of Company Common Stock,
  of which no more than 4,821,418 shares were outstanding as of the date
  hereof, and (ii) 5,000,000 shares of preferred stock, of which 109,709
  shares have been designated as Company Convertible Preferred Stock, of
  which no more than 109,709 shares are outstanding as of the date hereof. As
  of the date hereof, no shares of Company Common Stock and no shares
 
                                     A-11
<PAGE>
 
  of Company Convertible Preferred Stock were held in treasury by Company or
  otherwise owned by Company or its Subsidiaries. The outstanding shares of
  Company Stock have been duly authorized and are validly issued and
  outstanding, fully paid and nonassessable, and subject to no preemptive
  rights (and were not issued in violation of any preemptive rights). As of
  the date hereof, there are no shares of Company Stock authorized and
  reserved for issuance, Company does not have any Rights issued or
  outstanding with respect to Company Stock, and Company does not have any
  commitment to authorize, issue or sell any Company Stock or Rights, except
  pursuant to this Agreement, the Stock Option Agreement, the Company Stock
  Plans, the Company Convertible Preferred Stock and the Warrant. The number
  of shares of Company Common Stock which are issuable and reserved for
  issuance upon exercise of Company Stock Options as of the date hereof are
  Previously Disclosed in Company's Disclosure Schedule.
 
    (c) Subsidiaries. (i)(A) Company has Previously Disclosed a list of all
  of its Subsidiaries together with the jurisdiction of organization of each
  such Subsidiary, (B) Company owns, directly or indirectly, all the issued
  and outstanding equity securities of each of its Subsidiaries, (C) no
  equity securities of any of its Subsidiaries are or may become required to
  be issued (other than to it or its wholly owned Subsidiaries) by reason of
  any Right or otherwise, (D) there are no contracts, commitments,
  understandings or arrangements by which any of such Subsidiaries is or may
  be bound to sell or otherwise transfer any equity securities of any such
  Subsidiaries (other than to it or its wholly-owned Subsidiaries), (E) there
  are no contracts, commitments, understandings, or arrangements relating to
  its rights to vote or to dispose of such securities and (F) all the equity
  securities of each Subsidiary held by Company or its Subsidiaries are fully
  paid and nonassessable (except pursuant to applicable Colorado law) and are
  owned by Company or its Subsidiaries free and clear of any Liens.
 
    (ii) Company does not own beneficially, directly or indirectly, any
  equity securities or similar interests of any Person, or any interest in a
  partnership or joint venture of any kind, other than its Subsidiaries.
 
    (iii) Each of Company's Subsidiaries has been duly organized and is
  validly existing in good standing under the laws of the jurisdiction of its
  organization, and is duly qualified to do business and in good standing in
  the jurisdictions where its ownership or leasing of property or the conduct
  of its business requires it to be so qualified.
 
    (d) Corporate Power. Company and each of its Subsidiaries has the
  corporate power and authority to carry on its business as it is now being
  conducted and to own all its properties and assets; and Company has the
  corporate power and authority to execute, deliver and perform its
  obligations under this Agreement and the Stock Option Agreement and to
  consummate the transactions contemplated hereby and thereby.
 
    (e) Corporate Authority. Subject in the case of this Agreement to receipt
  of the requisite approval of the agreement of merger set forth in this
  Agreement by the holders of a majority of the outstanding shares of Company
  Common Stock entitled to vote thereon and a majority of the outstanding
  shares of Company Convertible Preferred Stock entitled to vote thereon each
  voting as a separate voting group (which are the only stockholder votes
  required thereon), this Agreement, the Stock Option Agreement and the
  transactions contemplated hereby and thereby have been authorized by all
  necessary corporate action of Company and the Company Board on or prior to
  the date hereof. This Agreement is a valid and legally binding obligation
  of Company, enforceable in accordance with its terms (except as
  enforceability may be limited by applicable bankruptcy, insolvency,
  reorganization, moratorium, fraudulent transfer and similar laws of general
  applicability relating to or affecting creditors' rights or by general
  equity principles). The Company Board of Directors has received the written
  opinion of The Wallach Company to the effect that as of the date hereof the
  consideration to be received by the holders of Company Stock in the Merger
  is fair to the holders of Company Stock from a financial point of view.
 
    (f) Regulatory Approvals; No Defaults. (i) No consents or approvals of,
  or filings or registrations with, any Governmental Authority or with any
  third party are required to be made or obtained by Company or any of its
  Subsidiaries in connection with the execution, delivery or performance by
  Company of this Agreement or the Stock Option Agreement or to consummate
  the Merger except for (A) filings of
 
                                     A-12
<PAGE>
 
  applications or notices with federal and Colorado banking authorities, (B)
  filings with the SEC and state securities authorities and the approval of
  this Agreement by the stockholders of Company, and (C) the filing of
  articles of merger with the Corporation Division pursuant to the UBCA and
  the Colorado Secretary pursuant to the CBCA and the issuance of related
  certificates of merger. As of the date hereof, Company is not aware of any
  reason why the approvals set forth in Section 7.01(b) will not be received
  without the imposition of a condition, restriction or requirement of the
  type described in Section 7.01(b).
 
    (ii) Subject to receipt of the regulatory approvals referred to in the
  preceding paragraph, and the expiration of related waiting periods, and
  required filings under federal and state securities laws, the execution,
  delivery and performance of this Agreement and the Stock Option Agreement
  and the consummation of the transactions contemplated hereby and thereby do
  not and will not (A) constitute a breach or violation of, or a default
  under, or give rise to any Lien, any acceleration of remedies or any right
  of termination under, any law, rule or regulation or any judgment, decree,
  order, governmental permit or license, or agreement, indenture or
  instrument of Company or of any of its Subsidiaries or to which Company or
  any of its Subsidiaries or properties is subject or bound, (B) constitute a
  breach or violation of, or a default under, the Company Certificate or the
  Company By-Laws, or (C) require any consent or approval under any such law,
  rule, regulation, judgment, decree, order, governmental permit or license,
  agreement, indenture or instrument.
 
    (g) Financial Reports and SEC Documents. (i) Company's Annual Reports on
  Form 10-K for the fiscal years ended December 31, 1994, 1995 and 1996, and
  all other reports, registration statements, definitive proxy statements or
  information statements filed or to be filed by it or any of its
  Subsidiaries subsequent to December 31, 1994 under the Securities Act, or
  under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act, in the form
  filed or to be filed (collectively, the Company's "SEC Documents") with the
  SEC, as of the date filed, (A) complied or will comply in all material
  respects as to form with the applicable requirements under the Securities
  Act or the Exchange Act, as the case may be, and (B) did not and will not
  contain any untrue statement of a material fact or omit to state a material
  fact required to be stated therein or necessary to make the statements
  therein, in the light of the circumstances under which they were made, not
  misleading; and each of the balance sheets contained in or incorporated by
  reference into any such SEC Document (including the related notes and
  schedules thereto) fairly presents, or will fairly present, the financial
  position of Company and its Subsidiaries as of its date, and each of the
  statements of income and changes in stockholders' equity and cash flows or
  equivalent statements in such SEC Documents (including any related notes
  and schedules thereto) fairly presents, or will fairly present, the results
  of operations, changes in stockholders' equity and changes in cash flows,
  as the case may be, of Company and its Subsidiaries for the periods to
  which they relate, in each case in accordance with generally accepted
  accounting principles consistently applied during the periods involved,
  except in each case as may be noted therein, subject to normal year-end
  audit adjustments in the case of unaudited statements.
 
    (ii) Since December 31, 1996, Company and its Subsidiaries have not
  incurred any liability other than in the ordinary course of business
  consistent with past practice.
 
    (iii) Since December 31, 1996, (A) Company and its Subsidiaries have
  conducted their respective businesses in the ordinary and usual course
  consistent with past practice (excluding the incurrence of expenses related
  to this Agreement and the transactions contemplated hereby) and (B) no
  event has occurred or circumstance arisen that, individually or taken
  together with all other facts, circumstances and events (described in any
  paragraph of Section 5.03 or otherwise), is reasonably likely to have a
  Material Adverse Effect with respect to Company.
 
    (h) Litigation. No litigation, claim or other proceeding before any court
  or governmental agency is pending against Company or any of its
  Subsidiaries and, to Company's knowledge, no such litigation, claim or
  other proceeding has been threatened.
 
    (i) Regulatory Matters. (i) Neither Company nor any of its Subsidiaries
  or any of their properties is a party to or is subject to any order,
  decree, agreement, memorandum of understanding or similar arrangement
 
                                     A-13
<PAGE>
 
  with, or a commitment letter or similar submission to, or extraordinary
  supervisory letter from, any federal or state governmental agency or
  authority charged with the supervision or regulation of financial
  institutions or issuers of securities or engaged in the insurance of
  deposits (including, without limitation, the Colorado Division of Banking,
  the Federal Reserve and the FDIC) or the supervision or regulation of it or
  any of its Subsidiaries (collectively, the "Regulatory Authorities").
 
    (ii) Neither it nor any of its Subsidiaries has been advised by any
  Regulatory Authority that such Regulatory Authority is contemplating
  issuing or requesting (or is considering the appropriateness of issuing or
  requesting) any such order, decree, agreement, memorandum of understanding,
  commitment letter, supervisory letter or similar submission.
 
    (j) Compliance with Laws. Company and each of its Subsidiaries:
 
      (i) is in compliance with all applicable federal, state, local and
    foreign statutes, laws, regulations, ordinances, rules, judgments,
    orders or decrees applicable thereto or to the employees conducting
    such businesses, including, without limitation, the Equal Credit
    Opportunity Act, the Fair Housing Act, the Community Reinvestment Act,
    the Home Mortgage Disclosure Act and all other applicable fair lending
    laws and other laws relating to discriminatory business practices;
 
      (ii) has all permits, licenses, authorizations, orders and approvals
    of, and has made all filings, applications and registrations with, all
    Governmental Authorities that are required in order to permit them to
    own or lease their properties and to conduct their businesses as
    presently conducted; all such permits, licenses, certificates of
    authority, orders and approvals are in full force and effect and, to
    Company's knowledge, no suspension or cancellation of any of them is
    threatened; and
 
      (iii) has received, since December 31, 1995, no notification or
    communication from any Governmental Authority (A) asserting that
    Company or any of its Subsidiaries is not in compliance with any of the
    statutes, regulations or ordinances which such Governmental Authority
    enforces or (B) threatening to revoke any license, franchise, permit or
    governmental authorization (nor, to Company's knowledge, do any grounds
    for any of the foregoing exist).
 
    (k) Material Contracts; Defaults. Except for those agreements and other
  documents filed as exhibits to its SEC Documents, neither it nor any of its
  Subsidiaries is a party to, bound by or subject to any agreement, contract,
  arrangement, commitment or understanding (whether written or oral) (i) that
  is a "material contract" within the meaning of Item 601(b)(10) of the SEC's
  Regulation S-K or (ii) that materially restricts the conduct of business by
  it or any of its Subsidiaries. Neither it nor any of its Subsidiaries is in
  default under any contract, agreement, commitment, arrangement, lease,
  insurance policy or other instrument to which it is a party, by which its
  respective assets, business, or operations may be bound or affected, or
  under which it or its respective assets, business, or operations receives
  benefits, and there has not occurred any event that, with the lapse of time
  or the giving of notice or both, would constitute such a default.
 
    (l) No Brokers. No action has been taken by Company that would give rise
  to any valid claim against any party hereto for a brokerage commission,
  finder's fee or other like payment with respect to the transactions
  contemplated by this Agreement, excluding a Previously Disclosed fee to be
  paid to The Wallach Company.
 
    (m) Employee Benefit Plans.
 
      (i) All benefit and compensation plans, contracts, policies or
    arrangements covering current employees or former employees of Company
    and its subsidiaries (the "Employees") and current or former directors
    of Company, including, but not limited to, "employee benefit plans"
    within the meaning of Section 3(3) of ERISA, and deferred compensation,
    stock option, stock purchase, stock appreciation rights, stock based,
    incentive and bonus plans (the "Benefit Plans"), are Previously
    Disclosed in the Disclosure Letter. True and complete copies of all
    Benefit Plans, including, but not
 
                                     A-14
<PAGE>
 
    limited to, any trust instruments and insurance contracts forming a
    part of any Benefit Plans, and all amendments thereto have been
    provided or made available to Zions.
 
      (ii) All employee benefit plans, other than "multiemployer plans"
    within the meaning of Section 3(37) of ERISA, covering Employees (the
    "Plans"), to the extent subject to ERISA, are in substantial compliance
    with ERISA. The Company is not a party to any "employee pension benefit
    plan" within the meaning of Section 3(2) of ERISA ("Pension Plan") and
    which is intended to be qualified under Section 401(a) of the Code.
    There is no material pending or threatened litigation relating to the
    Plans. Neither Company nor any of its Subsidiaries has engaged in a
    transaction with respect to any Plan that, assuming the taxable period
    of such transaction expired as of the date hereof, could subject
    Company or any Subsidiary to a tax or penalty imposed by either Section
    4975 of the Code or Section 502(i) of ERISA in an amount which would be
    material.
 
      (iii) No liability under Subtitle C or D of Title IV of ERISA has
    been or is expected to be incurred by Company or any of its
    Subsidiaries with respect to any ongoing, frozen or terminated "single-
    employer plan", within the meaning of Section 4001(a)(15) of ERISA,
    currently or formerly maintained by any of them, or the single-employer
    plan of any entity which is considered one employer with Company under
    Section 4001 of ERISA or Section 414 of the Code (an "ERISA
    Affiliate"). Neither Company, any of its Subsidiaries nor an ERISA
    Affiliate has contributed to a "multiemployer plan", within the meaning
    of Section 3(37) of ERISA, at any time on or after September 26, 1980.
    No notice of a "reportable event", within the meaning of Section 4043
    of ERISA for which the 30-day reporting requirement has not been
    waived, has been required to be filed for any Pension Plan or by any
    ERISA Affiliate within the 12-month period ending on the date hereof or
    will be required to be filed in connection with the transactions
    contemplated by this Plan.
 
      (iv) All contributions required to be made under the terms of any
    Plan have been timely made or have been reflected on the consolidated
    financial statements of Company included in the SEC Documents. Neither
    any Pension Plan nor any single-employer plan of an ERISA Affiliate has
    an "accumulated funding deficiency" (whether or not waived) within the
    meaning of Section 412 of the Code or Section 302 of ERISA and no ERISA
    Affiliate has an outstanding funding waiver. Neither Company nor any of
    its Subsidiaries has provided, or is required to provide, security to
    any Pension Plan or to any single-employer plan of an ERISA Affiliate
    pursuant to Section 401(a)(29) of the Code.
 
      (v) Under each Pension Plan which is a single-employer plan, as of
    the last day of the most recent plan year ended prior to the date
    hereof, the actuarially determined present value of all "benefit
    liabilities", within the meaning of Section 4001(a)(16) of ERISA (as
    determined on the basis of the actuarial assumptions contained in the
    Plan's most recent actuarial valuation), did not exceed the then
    current value of the assets of such Plan, and there has been no
    material change in the financial condition of such Plan since the last
    day of the most recent plan year.
 
      (vi) Neither Company nor any of its Subsidiaries has any obligations
    for retiree health and life benefits under any Benefit Plan. Company or
    its Subsidiaries may amend or terminate any such Benefit Plan at any
    time without incurring any liability thereunder.
 
      (vii) The consummation of the transactions contemplated by this
    Agreement will not (x) entitle any employees of Company or any of its
    Subsidiaries to severance pay, (y) accelerate the time of payment or
    vesting or trigger any payment of compensation or benefits under,
    increase the amount payable or trigger any other material obligation
    pursuant to, any of the Benefit Plans or (z) result in any breach or
    violation of, or a default under, any of the Benefit Plans. Without
    limiting the foregoing, as a result of the consummation of the
    transactions contemplated by this Agreement, none of Zions, Company, or
    any of its Subsidiaries will be obligated to make a payment to an
    individual that would be a "parachute payment" to a "disqualified
    individual" as those terms are defined in Section 280G of the Code,
    without regard to whether such payment is reasonable compensation for
    personal services performed or to be performed in the future.
 
                                     A-15
<PAGE>
 
    (n) Labor Matters. Neither Company nor any of its Subsidiaries is a party
  to or is bound by any collective bargaining agreement, contract or other
  agreement or understanding with a labor union or labor organization, nor is
  Company or any of its Subsidiaries the subject of a proceeding asserting
  that it or any such Subsidiary has committed an unfair labor practice
  (within the meaning of the National Labor Relations Act) or seeking to
  compel Company or any such Subsidiary to bargain with any labor
  organization as to wages or conditions of employment, nor is there any
  strike or other labor dispute involving it or any of its Subsidiaries
  pending or, to Company's knowledge, threatened, nor is Company aware of any
  activity involving its or any of its Subsidiaries' employees seeking to
  certify a collective bargaining unit or engaging in other organizational
  activity.
 
    (o) Takeover Laws; Dissenters' Rights. Company has taken all action
  required to be taken by it in order to exempt this Agreement, the Stock
  Option Agreement and the transactions contemplated hereby and thereby from,
  and this Agreement, the Stock Option Agreement and the transactions
  contemplated hereby and thereby (the "Covered Transactions") are exempt
  from, the requirements of any "moratorium", "control share", "fair price",
  "affiliate transaction", "business combination" or other antitakeover laws
  and regulations of the state of Colorado (collectively, "Takeover Laws").
  Holders of Company Common Stock do not have dissenters' rights in
  connection with the Merger. Holders of Company Convertible Preferred Stock
  do have dissenters' rights in connection with the Merger.
 
    (p) Environmental Matters.
 
      (i) Company and each of its Subsidiaries has complied at all times
    with applicable Environmental Laws; (ii) no real property (including
    buildings or other structures) currently or formerly owned or operated
    by Company or any of its Subsidiaries, or any property in which Company
    or any of its Subsidiaries has held a security interest, lien or a
    fiduciary or management role ("Loan Property"), has been contaminated
    with, or has had any release of, any Hazardous Substance; (iii) neither
    Company nor any of its Subsidiaries could be deemed the owner or
    operator of any Loan Property under any Environmental Law which such
    Loan Property has been contaminated with, or has had any release of,
    any Hazardous Substance; (iv) neither Company nor any of its
    Subsidiaries is subject to liability for any Hazardous Substance
    disposal or contamination on any third party property; (v) neither
    Company nor any of its Subsidiaries has received any notice, demand
    letter, claim or request for information alleging any violation of, or
    liability under, any Environmental Law; (vi) neither Company nor any of
    its Subsidiaries is subject to any order, decree, injunction or other
    agreement with any Governmental Authority or any third party relating
    to any Environmental Law; (vii) to the best of Company's knowledge,
    there are no circumstances or conditions (including the presence of
    asbestos, underground storage tanks, lead products, polychlorinated
    biphenyls, prior manufacturing operations, dry-cleaning, or automotive
    services) involving Company or any of its Subsidiaries, any currently
    or formerly owned or operated property, or any Loan Property, that
    could reasonably be expected to result in any claims, liability or
    investigations against Company or any of its Subsidiaries or result in
    any restrictions on the ownership, use, or transfer of any property
    pursuant to any Environmental Law; and (viii) Company has delivered to
    Zions copies of all environmental reports, studies, sampling data,
    correspondence, filings and other environmental information in its
    possession or reasonably available to it relating to Company, any
    Subsidiary of Company, any currently or formerly owned or operated
    property or any Loan Property.
 
      As used herein, the term "Environmental Law" means any federal, state
    or local law, regulation, order, decree, permit, authorization,
    opinion, common law or agency requirement relating to: (A) the
    protection or restoration of the environment, health, safety, or
    natural resources, (B) the handling, use, presence, disposal, release
    or threatened release of any Hazardous Substance or (C) noise, odor,
    wetlands, indoor air, pollution, contamination or any injury or threat
    of injury to persons or property in connection with any Hazardous
    Substance and the term "Hazardous Substance" means any substance in any
    concentration that is: (A) listed, classified or regulated pursuant to
    any Environmental Law; (B) any petroleum product or by-product,
    asbestos-containing material, lead-containing paint or
 
                                     A-16
<PAGE>
 
    plumbing, polychlorinated biphenyls, radioactive materials or radon; or
    (C) any other substance which is or may be the subject of regulatory
    action by any Governmental Authority in connection with any
    Environmental Law.
 
    (q) Tax Matters. (i)(A) All Tax Returns that are required to be filed
  (taking into account any extensions of time within which to file) by or
  with respect to Company and its Subsidiaries have been duly filed, (B) all
  Taxes shown to be due on the Tax Returns referred to in clause (A) have
  been paid in full, (C) the Tax Returns referred to in clause (A) have been
  examined by the Internal Revenue Service or the appropriate Tax authority
  or the period for assessment of the Taxes in respect of which such Tax
  Returns were required to be filed has expired, (D) all deficiencies
  asserted or assessments made as a result of such examinations have been
  paid in full, (E) no issues that have been raised by the relevant taxing
  authority in connection with the examination of any of the Tax Returns
  referred to in clause (A) are currently pending, and (F) no waivers of
  statutes of limitation have been given by or requested with respect to any
  Taxes of Company or its Subsidiaries. Company has made available to Zions
  true and correct copies of the United States federal income Tax Returns
  filed by Company and its Subsidiaries for each of the three most recent
  fiscal years ended on or before December 31, 1996. Neither Company nor any
  of its Subsidiaries has any liability with respect to income, franchise or
  similar Taxes that accrued on or before the end of the most recent period
  covered by Company's SEC Documents filed prior to the date hereof in excess
  of the amounts accrued with respect thereto that are reflected in the
  financial statements included in Company's SEC Documents filed on or prior
  to the date hereof. Neither Company nor any of its Subsidiaries is a party
  to any Tax allocation or sharing agreement, is or has been a member of an
  affiliated group filing consolidated or combined Tax returns (other than a
  group the common parent of which is or was Company) or otherwise has any
  liability for the Taxes of any person (other than Company and its
  Subsidiaries). As of the date hereof, neither Company nor any of its
  Subsidiaries has any reason to believe that any conditions exist that might
  prevent or impede the Merger from qualifying as a reorganization within the
  meaning of Section 368 of the Code.
 
    (ii) No Tax is required to be withheld pursuant to Section 1445 of the
  Code as a result of the transfer contemplated by this Agreement.
 
    (r) Risk Management Instruments. All interest rate swaps, caps, floors,
  option agreements, futures and forward contracts and other similar risk
  management arrangements, whether entered into for Company's own account, or
  for the account of one or more of Company's Subsidiaries or their customers
  (all of which are listed on Company's Disclosure Schedule), if any, were
  entered into (i) in accordance with prudent business practices and all
  applicable laws, rules, regulations and regulatory policies and (ii) with
  counterparties believed to be financially responsible at the time; and each
  of them constitutes the valid and legally binding obligation of Company or
  one of its Subsidiaries, enforceable in accordance with its terms (except
  as enforceability may be limited by applicable bankruptcy, insolvency,
  reorganization, moratorium, fraudulent transfer and similar laws of general
  applicability relating to or affecting creditors' rights or by general
  equity principles), and are in full force and effect. Neither Company nor
  its Subsidiaries, nor to Company's knowledge, any other party thereto, is
  in breach of any of its obligations under any such agreement or
  arrangement.
 
    (s) Books and Records. The books and records of Company and its
  Subsidiaries have been fully, properly and accurately maintained in all
  material respects, and there are no material inaccuracies or discrepancies
  of any kind contained or reflected therein, and they fairly present the
  financial position of Company and its Subsidiaries.
 
    (t) Insurance. Company has Previously Disclosed all of the insurance
  policies, binders, or bonds maintained by Company or its Subsidiaries
  ("Insurance Policies"). Company and its Subsidiaries are insured with
  reputable insurers against such risks and in such amounts as the management
  of Company reasonably has determined to be prudent in accordance with
  industry practices. All the Insurance Policies are in full force and
  effect; Company and its Subsidiaries are not in material default
  thereunder; and all claims thereunder have been filed in due and timely
  fashion.
 
                                     A-17
<PAGE>
 
    (u) Accounting Treatment. As of the date hereof, Company is not aware of
  any reason why the Merger will fail to qualify for "pooling of interests"
  accounting treatment.
 
  5.04 Representations and Warranties of Zions. Subject to Sections 5.01 and
5.02 and except as Previously Disclosed in a paragraph of its Disclosure
Schedule corresponding to the relevant paragraph below, Zions hereby
represents and warrants to Company as follows:
 
    (a) Organization, Standing and Authority. Zions is duly organized,
  validly existing and in good standing under the laws of the State of Utah.
  Zions is duly qualified to do business and is in good standing in the
  states of the United States and foreign jurisdictions where its ownership
  or leasing of property or assets or the conduct of its business requires it
  to be so qualified. Zions has in effect all federal, state, local, and
  foreign governmental authorizations necessary for it to own or lease its
  properties and assets and to carry on its business as it is now conducted.
 
    (b) Zions Stock. As of the date hereof, the authorized capital stock of
  Zions consists solely of 100,000,000 shares of Zions Common Stock, of which
  no more than 59,395,411 shares were outstanding as of the date hereof and
  3,000,000 shares of Zions Preferred Stock, of which no shares were
  outstanding as of the date hereof.
 
    (c) Corporate Power. Zions and each of its Significant Subsidiaries has
  the corporate power and authority to carry on its business as it is now
  being conducted and to own all its properties and assets; and Zions has the
  corporate power and authority to execute, deliver and perform its
  obligations under this Agreement and to consummate the transactions
  contemplated hereby.
 
    (d) Corporate Authority. This Agreement and the transactions contemplated
  hereby have been authorized by all necessary corporate action of Zions and
  its Board of Directors. This Agreement is a valid and legally binding
  agreement of Zions enforceable in accordance with its terms (except as
  enforceability may be limited by applicable bankruptcy, insolvency,
  reorganization, moratorium, fraudulent transfer and similar laws of general
  applicability relating to or affecting creditors' rights or by general
  equity principles).
 
    (e) Regulatory Approvals; No Defaults. (i) No consents or approvals of,
  or filings or registrations with, any court, administrative agency or
  commission or other governmental authority or instrumentality or with any
  third party are required to be made or obtained by Zions or any of its
  Subsidiaries in connection with the execution, delivery or performance by
  Zions of this Agreement or to consummate the Merger except for (A) the
  filing of applications and notices, as applicable, with the federal and
  state banking authorities; (B) approval of the listing on the NASDAQ of
  Zions Common Stock to be issued in the Merger; (C) the filing and
  declaration of effectiveness of the Registration Statement; (D) the filing
  of articles of merger with the Corporation Division pursuant to the UBCA
  and the Colorado Secretary pursuant to the CBCA and the issuance of related
  certificates of merger; (E) such filings as are required to be made or
  approvals as are required to be obtained under the securities or "Blue Sky"
  laws of various states in connection with the issuance of Zions Stock in
  the Merger; and (F) receipt of the approvals set forth in Section 7.01(b).
  As of the date hereof, Zions is not aware of any reason why the approvals
  set forth in Section 7.01(b) will not be received without the imposition of
  a condition, restriction or requirement of the type described in Section
  7.01(b).
 
    (ii) Subject to receipt of the regulatory approvals referred to in the
  preceding paragraph and expiration of the related waiting periods, and
  required filings under federal and state securities laws, the execution,
  delivery and performance of this Agreement and the consummation of the
  transactions contemplated hereby do not and will not (A) constitute a
  breach or violation of, or a default under, or give rise to any Lien, any
  acceleration of remedies or any right of termination under, any law, rule
  or regulation or any judgment, decree, order, governmental permit or
  license, or agreement, indenture or instrument of Zions or of any of its
  Subsidiaries or to which Zions or any of its Subsidiaries or properties is
  subject or bound, (B) constitute a breach or violation of, or a default
  under, the certificate of incorporation or by-laws (or similar governing
 
                                     A-18
<PAGE>
 
  documents) of Zions or any of its Subsidiaries, or (C) require any consent
  or approval under any such law, rule, regulation, judgment, decree, order,
  governmental permit or license, agreement, indenture or instrument.
 
    (f) Financial Reports and SEC Documents; Material Adverse
  Effect. (i) Zions's SEC Documents, as of the date filed, (A) complied or
  will comply in all material respects as to form with the applicable
  requirements under the Securities Act or the Exchange Act, as the case may
  be, and (B) did not and will not contain any untrue statement of a material
  fact or omit to state a material fact required to be stated therein or
  necessary to make the statements therein, in the light of the circumstances
  under which they were made, not misleading; and each of the balance sheets
  contained in or incorporated by reference into any such SEC Document
  (including the related notes and schedules thereto) fairly presents, or
  will fairly present, the financial position of Zions and its Subsidiaries
  as of its date, and each of the statements of income and changes in
  stockholders' equity and cash flows or equivalent statements in such SEC
  Documents (including any related notes and schedules thereto) fairly
  presents, or will fairly present, the results of operations, changes in
  stockholders' equity and changes in cash flows, as the case may be, of
  Zions and its Subsidiaries for the periods to which they relate, in each
  case in accordance with generally accepted accounting principles
  consistently applied during the periods involved, except in each case as
  may be noted therein, subject to normal year-end audit adjustments in the
  case of unaudited statements.
 
    (ii) Since December 31, 1996, no event has occurred or circumstance
  arisen that, individually or taken together with all other facts,
  circumstances and events (described in any paragraph of Section 5.04 or
  otherwise), is reasonably likely to have a Material Adverse Effect with
  respect to it.
 
    (g) No Brokers. No action has been taken by Zions that would give rise to
  any valid claim against any party hereto for a brokerage commission,
  finder's fee or other like payment with respect to the transactions
  contemplated by this Agreement.
 
    (h) Accounting Treatment; Tax Matters. As of the date hereof, it is aware
  of no reason why the Merger will fail to qualify for "pooling of interests"
  accounting treatment. As of the date hereof, neither Zions nor any of its
  Subsidiaries has any reason to believe that any conditions exist that might
  prevent or impede the Merger from qualifying as a reorganization within the
  meaning of Section 368 of the Code.
 
                                  ARTICLE VI
 
                                   COVENANTS
 
  6.01 Reasonable Best Efforts. Subject to the terms and conditions of this
Agreement, each of Company and Zions agrees to use its reasonable best efforts
in good faith to take, or cause to be taken, all actions, and to do, or cause
to be done, all things necessary, proper or desirable, or advisable under
applicable laws, so as to permit consummation of the Merger as promptly as
practicable and otherwise to enable consummation of the transactions
contemplated hereby and shall cooperate fully with the other party hereto to
that end.
 
  6.02 Stockholder Approval. Company agrees to take, in accordance with
applicable law and the Company Certificate and the Company By-Laws, all action
necessary to convene an appropriate meeting of its stockholders to consider
and vote upon the approval and adoption of this Agreement and any other
matters required to be approved by Company's stockholders for consummation of
the Merger (including any adjournment or postponement, the "Company Meeting"),
in each case as promptly as practicable after the Registration Statement is
declared effective. Except to the extent legally required for the discharge by
the Company Board of its fiduciary duties as advised by counsel to the Company
Board, the Company Board shall recommend such approval, and Company shall take
all reasonable, lawful action to solicit such approval by its stockholders.
 
  6.03 Registration Statement. (a) Zions agrees to prepare a registration
statement on Form S-4 or other applicable form (the "Registration Statement")
to be filed by Zions with the SEC in connection with the issuance
 
                                     A-19
<PAGE>
 
of Zions Common Stock in the Merger (including the proxy statement and
prospectus and other proxy solicitation materials of Company constituting a
part thereof (the "Proxy Statement") and all related documents). Company
agrees to cooperate, and to cause its Subsidiaries to cooperate, with Zions,
its counsel and its accountants, in preparation of the Registration Statement
and the Proxy Statement; and provided that Company and its Subsidiaries have
cooperated as required above, Zions agrees to file the Proxy Statement in
preliminary form with the SEC as soon as reasonably practicable but not later
than 30 days after the date hereof, and to file the Registration Statement
with the SEC as soon as reasonably practicable after any SEC comments with
respect to the preliminary Proxy Statement are resolved. Each of Company and
Zions agrees to use all reasonable efforts to cause the Registration Statement
to be declared effective under the Securities Act as promptly as reasonably
practicable after filing thereof. Zions also agrees to use all reasonable
efforts to obtain all necessary state securities law or "Blue Sky" permits and
approvals required to carry out the transactions contemplated by this
Agreement. Company agrees to furnish to Zions all information concerning
Company, its Subsidiaries, officers, directors and stockholders as may be
reasonably requested in connection with the foregoing.
 
  (b) Each of Company and Zions agrees, as to itself and its Subsidiaries,
that none of the information supplied or to be supplied by it for inclusion or
incorporation by reference in (i) the Registration Statement will, at the time
the Registration Statement and each amendment or supplement thereto, if any,
becomes effective under the Securities Act, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading, and (ii) the Proxy
Statement and any amendment or supplement thereto will, at the date of mailing
to stockholders and at the time of the Company Meeting, contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary to make the statements therein not misleading or
any statement which, in the light of the circumstances under which such
statement is made, will be false or misleading with respect to any material
fact, or which will omit to state any material fact necessary in order to make
the statements therein not false or misleading or necessary to correct any
statement in any earlier statement in the Proxy Statement or any amendment or
supplement thereto. Each of Company and Zions further agrees that if it shall
become aware prior to the Effective Date of any information furnished by it
that would cause any of the statements in the Proxy Statement to be false or
misleading with respect to any material fact, or to omit to state any material
fact necessary to make the statements therein not false or misleading,
promptly to inform the other party thereof and to take the necessary steps to
correct the Proxy Statement.
 
  (c) Zions agrees to advise Company, promptly after Zions receives notice
thereof, of the time when the Registration Statement has become effective or
any supplement or amendment has been filed, of the issuance of any stop order
or the suspension of the qualification of Zions Common Stock for offering or
sale in any jurisdiction, of the initiation or threat of any proceeding for
any such purpose, or of any request by the SEC for the amendment or supplement
of the Registration Statement or for additional information.
 
  6.04 Press Releases. Each of Company and Zions agrees that it will not,
without the prior approval of the other party, issue any press release or
written statement for general circulation relating to the transactions
contemplated hereby, except as otherwise required by applicable law or
regulation or NASDAQ rules (provided that the issuing party shall nevertheless
provide the other party with notice of, and the opportunity to review, any
such press release or written statement).
 
  6.05 Access; Information. (a) Company and Zions agrees that upon reasonable
notice and subject to applicable laws relating to the exchange of information,
each party shall afford the other party and the other party's officers,
employees, counsel, accountants and other authorized representatives, such
access during normal business hours throughout the period prior to the
Effective Time to the books, records (including, without limitation, tax
returns and work papers of independent auditors), properties, personnel and to
such other information as the requesting party may reasonably request and,
during such period, the providing party shall furnish promptly to the
requesting party (i) a copy of each material report, schedule and other
document filed by it pursuant to the requirements of federal or state
securities or banking laws, and (ii) all other information concerning the
business, properties and personnel of it as the requesting party may
reasonably request.
 
                                     A-20
<PAGE>
 
  (b) Each party agrees that it will not, and will cause its representatives
not to, use any information obtained pursuant to this Section 6.05 (as well as
any other information obtained prior to the date hereof in connection with the
entering into of this Agreement) for any purpose unrelated to the consummation
of the transactions contemplated by this Agreement. Subject to the
requirements of law, each party will keep confidential, and will cause its
representatives to keep confidential, all information and documents obtained
pursuant to this Section 6.05 (as well as any other information obtained prior
to the date hereof in connection with the entering into of this Agreement)
unless such information (i) was already known to such party, (ii) becomes
available to such party from other sources not known by such party to be bound
by a confidentiality obligation, (iii) is disclosed with the prior written
approval of the providing party or (iv) is or becomes readily ascertainable
from published information or trade sources. In the event that this Agreement
is terminated or the transactions contemplated by this Agreement shall
otherwise fail to be consummated, each party shall promptly cause all copies
of documents or extracts thereof containing information and data as to the
other party to be returned to the other party. No investigation by either
party of the business and affairs of the other party shall affect or be deemed
to modify or waive any representation, warranty, covenant or agreement in this
Agreement, or the conditions to either party's obligation to consummate the
transactions contemplated by this Agreement.
 
  6.06 Acquisition Proposals. Company agrees that it shall not, and shall
cause its Subsidiaries and its and its Subsidiaries' officers, directors,
agents, advisors and affiliates not to, solicit or encourage inquiries or
proposals with respect to, or engage in any negotiations concerning, or
provide any confidential information to, or have any discussions with, any
person relating to, any Acquisition Proposal, except to the extent legally
required for the discharge by the Company Board of its fiduciary duties as
advised by counsel to the Company Board. Company shall immediately cease and
cause to be terminated any activities, discussions or negotiations conducted
prior to the date of this Agreement with any parties other than Zions with
respect to any of the foregoing and shall use its reasonable best efforts to
enforce any confidentiality or similar agreement relating to an Acquisition
Proposal. Company shall promptly (within 24 hours) advise Zions following the
receipt by Company of any Acquisition Proposal and the substance thereof
(including the identity of the person making such Acquisition Proposal), and
advise Zions of any developments with respect to such Acquisition Proposal
immediately upon the occurrence thereof.
 
  6.07 Affiliate Agreements. (a) Not later than the 15th day prior to the
mailing of the Proxy Statement, Company shall deliver to Zions a schedule of
each person that, to the best of its knowledge, is or is reasonably likely to
be, as of the date of the Company Meeting, deemed to be an "affiliate" of
Company (each, a "Company Affiliate") as that term is used in Rule 145 under
the Securities Act or SEC Accounting Series Releases 130 and 135.
 
  (b) Company shall use its reasonable best efforts to cause each person who
may be deemed to be a Company Affiliate to execute and deliver to Zions on or
before the date of mailing of the Proxy Statement an agreement in the form
attached hereto as Exhibit A.
 
  6.08 Takeover Laws. No party hereto shall take any action that would cause
the transactions contemplated by this Agreement or the Stock Option Agreement
to be subject to requirements imposed by any Takeover Law and each of them
shall take all necessary steps within its control to exempt (or ensure the
continued exemption of) the transactions contemplated by this Agreement from,
or if necessary challenge the validity or applicability of, any applicable
Takeover Law, as now or hereafter in effect.
 
  6.09 Certain Policies. Prior to the Effective Date, Company shall,
consistent with generally accepted accounting principles and on a basis
mutually satisfactory to it and Zions, modify and change its loan, litigation
and real estate valuation policies and practices (including loan
classifications and levels of reserves) so as to be applied on a basis that is
consistent with that of Zions.
 
  6.10 NASDAQ Listing. Zions agrees to use its reasonable best efforts to
list, prior to the Effective Date, on the NASDAQ, subject to official notice
of issuance, the shares of Zions Common Stock to be issued to the holders of
Company Stock in the Merger.
 
                                     A-21
<PAGE>
 
  6.11 Regulatory Applications. (a) Zions and Company and their respective
Subsidiaries shall cooperate and use their respective reasonable best efforts
to prepare all documentation, to effect all filings and to obtain all permits,
consents, approvals and authorizations of all third parties and Governmental
Authorities necessary to consummate the transactions contemplated by this
Agreement. Zions and Company shall make all required bank regulatory filings,
including the appropriate filing with the Federal Reserve, within 30 days
after the date hereof. Each of Zions and Company shall have the right to
review in advance, and to the extent practicable each will consult with the
other, in each case subject to applicable laws relating to the exchange of
information, with respect to all material written information submitted to any
third party or any Governmental Authority in connection with the transactions
contemplated by this Agreement. In exercising the foregoing right, each of the
parties hereto agrees to act reasonably and as promptly as practicable. Each
party hereto agrees that it will consult with the other party hereto with
respect to the obtaining of all material permits, consents, approvals and
authorizations of all third parties and Governmental Authorities necessary or
advisable to consummate the transactions contemplated by this Agreement and
each party will keep the other party appraised of the status of material
matters relating to completion of the transactions contemplated hereby.
 
  (b) Each party agrees, upon request, to furnish the other party with all
information concerning itself, its Subsidiaries, directors, officers and
stockholders and such other matters as may be reasonably necessary or
advisable in connection with any filing, notice or application made by or on
behalf of such other party or any of its Subsidiaries to any third party or
Governmental Authority.
 
  6.12 Indemnification; Director and Officers' Insurance. (a) From and after
the Effective Time through the fourth anniversary of the Effective Date, Zions
agrees to indemnify and hold harmless each present and former director and
officer of Company or any Subsidiary of Company determined as of the Effective
Time (the "Indemnified Parties"), against any costs or expenses (including
reasonable attorneys' fees), judgments, fines, losses, claims, damages or
liabilities (collectively,"Costs") incurred in connection with any claim,
action, suit, proceeding or investigation, whether civil, criminal,
administrative or investigative, arising out of matters existing or occurring
at or prior to the Effective Time (including with respect to this Agreement or
any of the transactions contemplated hereby), whether asserted, claimed or
arising prior to, at or after the Effective Time, to the extent to which such
Indemnified Parties were entitled under Colorado law and the Company
Certificate or the Company By-Laws in effect on the date hereof, and Zions
shall also advance expenses as incurred to the extent permitted under Colorado
law and the Company Certificate and the Company By-Laws.
 
  (b) Any Indemnified Party wishing to claim indemnification under Section
6.12(a), upon learning of any such claim, action, suit, proceeding or
investigation, shall as promptly as possible notify Zions thereof, but the
failure to so notify shall not relieve Zions of any liability it may have to
such Indemnified Party if such failure does not materially prejudice Zions. In
the event of any such claim, action, suit, proceeding or investigation
(whether arising before or after the Effective Time), (i) Zions shall have the
right to assume the defense thereof and Zions shall not be liable to such
Indemnified Parties for any legal expenses of other counsel or any other
expenses subsequently incurred by such Indemnified Parties in connection with
the defense thereof, except that if Zions elects not to assume such defense or
counsel for the Indemnified Parties advises in writing that there are issues
which raise conflicts of interest between Zions and the Indemnified Parties,
the Indemnified Parties may retain counsel satisfactory to them, and Zions
shall pay the reasonable fees and expenses of one such counsel for the
Indemnified Parties in any jurisdiction promptly as statements thereof are
received, (ii) the Indemnified Parties will cooperate in the defense of any
such matter and (iii) Zions shall not be liable for any settlement effected
without its prior written consent (which consent shall not be unreasonably
withheld); and provided, further, that Zions shall not have any obligation
hereunder to any Indemnified Party when and if a court of competent
jurisdiction shall ultimately determine, and such determination shall have
become final and nonappealable, that the indemnification of such Indemnified
Party in the manner contemplated hereby is not permitted or is prohibited by
applicable law.
 
  (c) For a period of three years after the Effective Time, Zions shall use
its reasonable best efforts to cause to be maintained in effect the current
policies of directors' and officers' liability insurance maintained by Company
(provided that Zions may substitute therefor policies of comparable coverage
with respect to claims
 
                                     A-22
<PAGE>
 
arising from facts or events which occurred before the Effective Time);
provided, however, that in no event shall Zions be obligated to expend, in
order to maintain or provide insurance coverage pursuant to this Section
6.12(c), any amount per annum in excess of 125% of the amount of the annual
premiums paid as of the date hereof by Company for such insurance (the
"Maximum Amount"). If the amount of the annual premiums necessary to maintain
or procure such insurance coverage exceeds the Maximum Amount, Zions shall use
all reasonable efforts to maintain the most advantageous policies of
directors' and officers' insurance obtainable for an annual premium equal to
the Maximum Amount. Notwithstanding the foregoing, prior to the Effective
Time, Zions may request Company to, and Company shall, purchase insurance
coverage, on such terms and conditions as shall be acceptable to Zions,
extending for a period of three years Company's directors' and officers'
liability insurance coverage in effect as of the date hereof (covering past or
future claims with respect to periods before the Effective Time) and such
coverage shall satisfy Zions' obligations under this Subsection (c).
 
  (d) If Zions or any of its successors or assigns (i) shall consolidate with
or merge into any other corporation or entity and shall not be the continuing
or surviving corporation or entity of such consolidation or merger or
(ii) shall transfer all or substantially all of its properties and assets to
any individual, corporation or other entity, then and in each such case,
proper provision shall be made so that the successors and assigns of Zions
shall assume the obligations set forth in this Section 6.12.
 
  6.13 Benefit Plans. Zions shall, from and after the Effective Time, provide
former employees of Company who remain as employees of Zions, with employee
benefit plans no less favorable in the aggregate than those provided to
similarly situated employees of Zions. If any employee of Company or any
subsidiary of Company becomes a participant in any employment benefit plan,
practice or policy of the Surviving Corporation, such employee shall be given
credit under such plan, practice or policy for all service prior to the
Effective Date with Company or such subsidiary of Company for purposes of
eligibility and vesting, but not for benefit accrual purposes, for which such
service is taken into account or recognized, provided that there be no
duplication of such benefits as are provided under any employee benefit plans,
practices, or policies of Company or any subsidiary of Company that continue
in effect following the Effective Time. In addition, Zions shall roll
Company's existing 401(k) plan into Zion's 401(k) plan.
 
  6.14 Accountants' Letters. Each of Company and Zions shall use its
reasonable best efforts to cause to be delivered to the other party, and to
Zions's directors and officers who sign the Registration Statement, a letter
of KPMG Peat Marwick LLP, independent auditors for each, dated (i) the date on
which the Registration Statement shall become effective and (ii) a date
shortly prior to the Effective Date, and addressed to such other party, and
such directors and officers, in form and substance customary for "comfort"
letters delivered by independent accountants in accordance with Statement of
Accounting Standards No. 72.
 
  6.15 Notification of Certain Matters. Each of Company and Zions shall give
prompt notice to the other of any fact, event or circumstance known to it that
(i) is reasonably likely, individually or taken together with all other facts,
events and circumstances known to it, to result in any Material Adverse Effect
with respect to it or (ii) would cause or constitute a material breach of any
of its representations, warranties, covenants or agreements contained herein.
 
  6.16 Conversion of Company Convertible Stock and Exercise of
Warrant. Company shall use its reasonable best efforts to cause all
outstanding shares of the Company Convertible Preferred Stock to be converted
and the Warrant to be exercised prior to the Effective Date.
 
  6.17 Shareholder Agreements. The directors and certain officers of Company,
in their capacities as shareholders, in exchange for good and valuable
consideration, have executed and delivered to Zions shareholder agreements
substantially in the form of Exhibit B hereto (the "Shareholder Agreements"),
committing such persons, among other things, (i) to vote their shares of
Company Common Stock in favor of the Agreement at the Company Meeting and (ii)
to certain representations concerning the ownership of Company Common Stock
and Zions Common Stock to be received in the Merger.
 
                                     A-23
<PAGE>
 
                                  ARTICLE VII
 
                   CONDITIONS TO CONSUMMATION OF THE MERGER
 
  7.01 Conditions to Each Party's Obligation to Effect the Merger. The
respective obligation of each of Zions and Company to consummate the Merger is
subject to the fulfillment or written waiver by Zions and Company prior to the
Effective Time of each of the following conditions:
 
    (a) Stockholder Approvals. This Agreement and the Merger shall have been
  duly adopted by the requisite vote of the stockholders of Company.
 
    (b) Regulatory Approvals. All regulatory approvals required to consummate
  the transactions contemplated hereby shall have been obtained and shall
  remain in full force and effect and all statutory waiting periods in
  respect thereof shall have expired and no such approvals shall contain any
  conditions, restrictions or requirements which the Zions Board reasonably
  determines would (i) following the Effective Time, have a Material Adverse
  Effect on the Surviving Corporation and its Subsidiaries taken as a whole
  or (ii) reduce the benefits of the transactions contemplated hereby to such
  a degree that Zions would not have entered into this Agreement had such
  conditions, restrictions or requirements been known at the date hereof.
 
    (c) No Injunction. No Governmental Authority of competent jurisdiction
  shall have enacted, issued, promulgated, enforced or entered any statute,
  rule, regulation, judgment, decree, injunction or other order (whether
  temporary, preliminary or permanent) which is in effect and prohibits
  consummation of the transactions contemplated by this Agreement.
 
    (d) Registration Statement. The Registration Statement shall have become
  effective under the Securities Act and no stop order suspending the
  effectiveness of the Registration Statement shall have been issued and no
  proceedings for that purpose shall have been initiated or threatened by the
  SEC.
 
    (e) Blue Sky Approvals. All permits and other authorizations under state
  securities laws necessary to consummate the transactions contemplated
  hereby and to issue the shares of Zions Common Stock to be issued in the
  Merger shall have been received and be in full force and effect.
 
    (f) Listing. The shares of Zions Common Stock to be issued in the Merger
  shall have been approved for listing on the NASDAQ, subject to official
  notice of issuance.
 
  7.02 Conditions to Obligation of Company. The obligation of Company to
consummate the Merger is also subject to the fulfillment or written waiver by
Company prior to the Effective Time of each of the following conditions:
 
    (a) Representations and Warranties. The representations and warranties of
  Zions set forth in this Agreement (subject to the standard set forth in
  Section 5.02) shall be true and correct as of the date of this Agreement
  and as of the Effective Date as though made on and as of the Effective Date
  (except that representations and warranties that by their terms speak only
  as of the date of this Agreement or some other date shall be true and
  correct as of such date), and Company shall have received a certificate,
  dated the Effective Date, signed on behalf of Zions by the Chief Executive
  Officer and the Chief Financial Officer of Zions to such effect.
 
    (b) Performance of Obligations of Zions. Zions shall have performed in
  all material respects all obligations required to be performed by it under
  this Agreement at or prior to the Effective Time, and Company shall have
  received a certificate, dated the Effective Date, signed on behalf of Zions
  by the Chief Executive Officer and the Chief Financial Officer of Zions to
  such effect.
 
    (c) Opinion of Company's Counsel. Company shall have received an opinion
  of Lewis, Rice & Fingersh, special counsel to Company, dated the Effective
  Date, to the effect that, on the basis of facts,
 
                                     A-24
<PAGE>
 
  representations and assumptions set forth in such opinion, (i) the Merger
  constitutes a "reorganization" within the meaning of Section 368 of the
  Code and (ii) no gain or loss will be recognized by stockholders of Company
  who receive shares of Zions Common Stock in exchange for shares of Company
  Common Stock, except with respect to cash received in lieu of fractional
  share interests. In rendering its opinion, Lewis, Rice & Fingersh may
  require and rely upon representations contained in letters from Company,
  Zions and stockholders of Company.
 
    (d) Accountants' Letters. Company shall have received the letters
  referred to in Section 6.14 from KPMG Peat Marwick LLP, Zions' independent
  auditors.
 
    (e) Rights Plan. No Stock Acquisition Date (as such term is defined in
  the Shareholder Protection Rights Plan) shall have occurred under the
  Shareholder Protection Rights Plan prior to the Effective Time.
 
    (f) Fairness Opinion. Company shall have received the written opinion of
  The Wallach Company to the effect that, as of the date of the mailing of
  the Proxy Statement to the shareholders of Company in connection with the
  Company Meeting, the consideration to be received by the holders of the
  Company Stock in the Merger is fair to the holders of the Company Stock
  from a financial point of view.
 
    (g) Accounting Treatment. Company shall have received from KPMG Peat
  Marwick LLP, Company's independent auditors, letters, dated the date of or
  shortly prior to each of the mailing date of the Proxy Statement and the
  Effective Date, stating its opinion that the Merger shall qualify for
  pooling-of-interests accounting treatment.
 
  7.03 Conditions to Obligation of Zions. The obligation of Zions to
consummate the Merger is also subject to the fulfillment or written waiver by
Zions prior to the Effective Time of each of the following conditions:
 
    (a) Representations and Warranties. The representations and warranties of
  Company set forth in this Agreement (subject to the standard set forth in
  Section 5.02) shall be true and correct as of the date of this Agreement
  and as of the Effective Date as though made on and as of the Effective Date
  (except that representations and warranties that by their terms speak only
  as of the date of this Agreement or some other date shall be true and
  correct as of such date) and Zions shall have received a certificate, dated
  the Effective Date, signed on behalf of Company by the Chief Executive
  Officer and the Chief Financial Officer of Company to such effect.
 
    (b) Performance of Obligations of Company. Company shall have performed
  in all material respects all obligations required to be performed by it
  under this Agreement at or prior to the Effective Time, and Zions shall
  have received a certificate, dated the Effective Date, signed on behalf of
  Company by the Chief Executive Officer and the Chief Financial Officer of
  Company to such effect.
 
    (c) Opinion of Zions' Counsel. Zions shall have received an opinion of
  Sullivan & Cromwell, special counsel to Zions, dated the Effective Date, to
  the effect that, on the basis of facts, representations and assumptions set
  forth in such opinion, the Merger constitutes a reorganization under
  Section 368 of the Code. In rendering its opinion, Sullivan & Cromwell may
  require and rely upon representations contained in letters from Company,
  Zions and stockholders of Company.
 
    (d) Accountants' Letters. Zions shall have received the letters referred
  to in Section 6.14 from KPMG Peat Marwick LLP, Company's independent
  auditors.
 
    (e) Accounting Treatment. Zions shall have received from KPMG Peat
  Marwick LLP, Zions' independent auditors, letters, dated the date of or
  shortly prior to each of the mailing date of the Proxy Statement and the
  Effective Date, stating its opinion that the Merger shall qualify for
  pooling-of-interests accounting treatment.
 
                                     A-25
<PAGE>
 
                                 ARTICLE VIII
 
                                  TERMINATION
 
  8.01 Termination. This Agreement may be terminated, and the Acquisition may
be abandoned:
 
    (a) Mutual Consent. At any time prior to the Effective Time, by the
  mutual consent of Zions and Company, if the Board of Directors of each so
  determines by vote of a majority of the members of its entire Board.
 
    (b) Breach. At any time prior to the Effective Time, by Zions or Company,
  if its Board of Directors so determines by vote of a majority of the
  members of its entire Board, in the event of either: (i) a breach by the
  other party of any representation or warranty contained herein (subject to
  the standard set forth in Section 5.02), which breach cannot be or has not
  been cured within 30 days after the giving of written notice to the
  breaching party of such breach; or (ii) a breach by the other party of any
  of the covenants or agreements contained herein, which breach cannot be or
  has not been cured within 30 days after the giving of written notice to the
  breaching party of such breach, provided that such breach (whether under
  (i) or (ii)) would be reasonably likely, individually or in the aggregate
  with other breaches, to result in a Material Adverse Effect.
 
    (c) Delay. At any time prior to the Effective Time, by Zions or Company,
  if its Board of Directors so determines by vote of a majority of the
  members of its entire Board, in the event that the Merger is not
  consummated by March 31, 1998, except to the extent that the failure of the
  Merger then to be consummated arises out of or results from the knowing
  action or inaction of the party seeking to terminate pursuant to this
  Section 8.01(c).
 
    (d) No Approval. By Company or Zions, if its Board of Directors so
  determines by a vote of a majority of the members of its entire Board, in
  the event (i) the approval of any Governmental Authority required for
  consummation of the Merger and the other transactions contemplated by this
  Agreement shall have been denied by final nonappealable action of such
  Governmental Authority or (ii) the stockholder approval required by Section
  7.01(a) herein is not obtained at the Company Meeting.
 
    (e) Failure to Recommend, Etc. At any time prior to the Company Meeting,
  by Zions if the Company Board shall have failed to make its recommendation
  referred to in Section 6.02, withdrawn such recommendation or modified or
  changed such recommendation in a manner adverse in any respect to the
  interests of Zions.
 
    (f) Possible Adjustment. By Company, if its Board of Directors so
  determines by a vote of a majority of the members of its entire Board, if
  both of the following conditions are satisfied:
 
      (1) The Average Closing Price on the Determination Date of shares of
    Zions Common Stock shall be less than the Starting Price; and
 
      (2)(i) the number obtained by dividing the Average Closing Price on
    such Determination Date by the Starting Price (such number being
    referred to herein as the "Zions Ratio") shall be less than (ii) the
    number obtained by dividing the KBW Average Index by the KBW Starting
    Index and multiplying the quotient in this clause (2) (ii) by 0.82
    (such number being referred to herein as the "Index Ratio"):
 
subject, however, to the following two sentences. If Company elects to
exercise its termination right pursuant to the immediately preceding sentence,
it shall give written notice to Zions within 24 hours of the Determination
Date. Prior to the Effective Date, Zions shall have the option of adjusting
(x) the Common Exchange Ratio to equal the lesser of (i) a number equal to a
quotient (rounded to the nearest one-thousandth), the numerator of which is
the product of the Starting Price and the Common Exchange Ratio (as then in
effect) and the denominator of which is the Average Closing Price, and (ii) a
number equal to a quotient (rounded to the nearest one-thousandth), the
numerator of which is the Index Ratio multiplied by the Common Exchange Ratio
(as then
 
                                     A-26
<PAGE>
 
in effect) and the denominator of which is the Zions Ratio and (y) the
Preferred Exchange Ratio to equal the lesser of (i) a number equal to a
quotient (rounded to the nearest one-thousandth), the numerator of which is
the product of the Starting Price and the Preferred Exchange Ratio (as then in
effect) and the denominator of which is the Average Closing Price, and (ii) a
number equal to a quotient (rounded to the nearest one-thousandth), the
numerator of which is the Index Ratio multiplied by the Preferred Exchange
Ratio (as then in effect) and the denominator of which is the Zions Ratio. If
Zions makes an election contemplated by the preceding sentence, it shall give
prompt written notice to Company of such election and the revised Common
Exchange Ratio and Preferred Exchange Ratio, whereupon no termination shall
have occurred pursuant to this Section 8.01(f) and this Agreement shall remain
in effect in accordance with its terms (except as the Common Exchange Ratio
and the Preferred Exchange Ratio shall have been so modified), and any
references in this Agreement to "Common Exchange Ratio" and the "Preferred
Exchange Ratio" shall thereafter be deemed to refer to the Common Exchange
Ratio and the Preferred Exchange Ratio as adjusted pursuant to this
Section 8.01(f).
 
  8.02 Effect of Termination and Abandonment. In the event of termination of
this Agreement and the abandonment of the Merger pursuant to this Article
VIII, no party to this Agreement shall have any liability or further
obligation to any other party hereunder except (i) as set forth in Section
9.01 and (ii) that termination will not relieve a breaching party from
liability for any willful breach of this Agreement giving rise to such
termination.
 
                                  ARTICLE IX
 
                                 MISCELLANEOUS
 
  9.01 Survival. No representations, warranties, agreements and covenants
contained in this Agreement shall survive the Effective Time (other than
Sections 6.12 and 6.13 and this Article IX which shall survive the Effective
Time) or the termination of this Agreement if this Agreement is terminated
prior to the Effective Time (other than Sections 6.03(b), 6.05(b), 8.02, and
this Article IX which shall survive such termination).
 
  9.02 Waiver; Amendment. Prior to the Effective Time, any provision of this
Agreement may be (i) waived by the party benefitted by the provision, or (ii)
amended or modified at any time, by an agreement in writing between the
parties hereto executed in the same manner as this Agreement, except that
after the Company Meeting, this Agreement may not be amended if it would
violate the CBCA or reduce the consideration to be received by Company
stockholders in the Merger.
 
  9.03 Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed to constitute an original.
 
  9.04 Governing Law; Waiver of Jury Trial. This Agreement shall be governed
by, and interpreted in accordance with, the laws of the State of Utah
applicable to contracts made and to be performed entirely within such State
(except to the extent that mandatory provisions of Federal law or of the CBCA
are applicable). Each of the parties hereto hereby irrevocably waives any and
all right to trial by jury in any legal proceeding arising out of or related
to this Agreement or the transactions contemplated hereby.
 
  9.05 Expenses. Each party hereto will bear all expenses incurred by it in
connection with this Agreement and the transactions contemplated hereby.
 
                                     A-27
<PAGE>
 
  9.06 Notices. All notices, requests and other communications hereunder to a
party shall be in writing and shall be deemed given if personally delivered,
telecopied (with confirmation) or mailed by registered or certified mail
(return receipt requested) to such party at its address set forth below or
such other address as such party may specify by notice to the parties hereto.
 
  If to Company, to:
 
    Vectra Banking Corporation
    1650 South Colorado Boulevard
    Denver, Colorado 80222
    Attention: Gary S. Judd, President
    Facsimile: (303) 759-5017
 
  With a copy to:
 
    Lewis, Rice & Fingersh, L.C.
    500 N. Broadway
    St. Louis, Missouri 63102-2147
    Attention: Thomas C. Erb
    Facsimile: (314) 241-6056
 
  If to Zions, to:
 
    Zions Bancorporation
    One South Main, Suite 1380
    Salt Lake City, Utah 84111
    Attention: Dale M. Gibbons
    Facsimile: (801) 524-2129
 
  With a copy to:
 
    Sullivan & Cromwell
    444 South Flower Street
    Los Angeles, California 90071
    Attention: Stanley F. Farrar
    Facsimile: (213) 683-0457
 
  9.07 Entire Understanding; No Third Party Beneficiaries. This Agreement, the
Confidentiality Agreement dated July 29, 1997 and any Stock Option Agreement
entered into represent the entire understanding of the parties hereto with
reference to the transactions contemplated hereby and thereby and this
Agreement supersedes any and all other oral or written agreements heretofore
made (other than any such Stock Option Agreement). Except for Sections 6.12
and 6.13 and as set forth in Company's Disclosure Schedule, nothing in this
Agreement expressed or implied, is intended to confer upon any person, other
than the parties hereto or their respective successors, any rights, remedies,
obligations or liabilities under or by reason of this Agreement.
 
  9.08 Interpretation; Effect. When a reference is made in this Agreement to
Sections, Exhibits or Schedules, such reference shall be to a Section of, or
Exhibit or Schedule to, this Agreement unless otherwise indicated. The table
of contents and headings contained in this Agreement are for reference
purposes only and are not part of this Agreement. Whenever the words
"include," "includes" or "including" are used in this Agreement, they shall be
deemed to be followed by the words "without limitation." No provision of this
Agreement shall be construed to require Company, Zions or any of their
respective Subsidiaries, affiliates or directors to take any action which
would violate applicable law (whether statutory or common law), rule or
regulation.
 
                                     A-28
<PAGE>
 
  IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in counterparts by their duly authorized officers, all as of the day
and year first above written.
 
                                          VECTRA BANKING CORP.
 
                                                    /s/ Gary S. Judd
                                          By: _________________________________
                                             Name: Gary S. Judd
                                             Title: President and Chief
                                              Executive Officer
 
                                          ZIONS BANCORPORATION
 
                                                  /s/ Dale M. Gibbons
                                          By: _________________________________
                                             Name: Dale M. Gibbons
                                             Title: Chief Financial Officer
 
                                     A-29
<PAGE>
 
                                                                      APPENDIX B
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                             STOCK OPTION AGREEMENT
 
                  DATED AS OF THE 23RD DAY OF SEPTEMBER, 1997
 
                                 BY AND BETWEEN
 
                              ZIONS BANCORPORATION
 
                                      AND
 
                              VECTRA BANKING CORP.
 
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
<PAGE>
 
                            STOCK OPTION AGREEMENT
 
  STOCK OPTION AGREEMENT, dated as of the 23rd day of September, 1997 (this
"Agreement"), between Zions Bancorporation, a Utah corporation ("Grantee"),
and Vectra Banking Corp., a Colorado corporation ("Issuer").
 
                                  WITNESSETH:
 
  WHEREAS, Grantee and Issuer are entering into an Agreement and Plan of
Merger dated as of the date hereof (the "Plan"), which is being executed by
the parties hereto simultaneously with the execution of this Agreement; and
 
  WHEREAS, as a condition and inducement to Grantee's entering into the Plan
and in consideration therefor, Issuer has agreed to grant Grantee the Option
(as defined below);
 
  NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
and agreements set forth herein and in the Plan, the parties hereto agree as
follows:
 
  Section 1. Grant of Option. (a) Issuer hereby grants to Grantee an
unconditional, irrevocable option (the "Option") to purchase, subject to the
terms hereof, up to 959,462 fully paid and nonassessable shares of Common
Stock, par value $.01 per share ("Common Stock"), of Issuer at a price per
share equal to the average of the closing prices per share of Common Stock
reported on the NASDAQ National Market System for the ten NASDAQ trading day
period ending on the date hereof (the "Initial Price"); provided, however,
that in the event Issuer issues or agrees to issue (other than pursuant to
options and warrants to issue Common Stock or shares of convertible stock
convertible into shares of Common Stock in effect or outstanding as of the
date hereof) any shares of Common Stock at a price less than the Initial Price
(as adjusted pursuant to Section 5(b)), such price shall be equal to such
lesser price (such price, as adjusted as hereinafter provided, the "Option
Price"); and, provided further, however, that in no event shall the number of
shares of Common Stock for which the Option is exercisable exceed 19.9% of the
number of shares of Common Stock then issued and outstanding without giving
effect to any shares subject or issued pursuant to the Option. The number of
shares of Common Stock that may be received upon the exercise of the Option
and the Option Price are subject to adjustment as herein set forth.
 
  (b) In the event that any additional shares of Common Stock are issued or
otherwise become outstanding after the date of this Agreement (other than
pursuant to this Agreement and other than pursuant to an event described in
Section 5(a) hereof), the number of shares of Common Stock subject to the
Option shall be increased so that after such issuance such number together
with any shares of Common Stock previously issued pursuant hereto, equals
19.9% of the number of shares of Common Stock then issued and outstanding
without giving effect to any shares subject or issued pursuant to the Option.
Nothing contained in this Section 1(b) or elsewhere in this Agreement shall be
deemed to authorize Issuer to issue shares in breach of any provision of the
Merger Agreement.
 
  Section 2. Exercise of Option.
 
  (a) Timing of Exercise, Termination. Provided that (i) Grantee shall not be
in material breach of the agreements or covenants contained in this Agreement
or the Plan and (ii) no preliminary or permanent injunction or other order
against delivery of shares covered by the Option issued by any court of
competent jurisdiction in the United States shall be in effect, Grantee may
exercise the Option, in whole or part, at any time and from time to time
following the occurrence of a Purchase Event (as defined below); provided that
the Option shall terminate and be of no further force and effect upon the
earliest to occur of (i) the time immediately prior to the Effective Time,
(ii) 12 months after the first occurrence of a Purchase Event, (iii) 18 months
after the termination of the Plan following the occurrence of a Preliminary
Purchase Event (as defined below), (iv) termination of the Plan in accordance
with the terms thereof prior to the occurrence of a Purchase Event or a
Preliminary Purchase
 
                                      B-1
<PAGE>
 
Event (other than a termination of the Plan by Grantee pursuant to Section
8.01(b)(i) or (ii) or by Grantee and Issuer pursuant to Section 8.01(a)
thereof if Grantee shall at that time have been entitled to terminate the Plan
pursuant to Section 8.01(b)(i) or (ii) thereof (provided that the breach of
Issuer giving rise to such termination or such right to terminate was
willful)), or (v) 18 months after the termination of the Plan by Grantee
pursuant to Section 8.01(b)(i) or (ii) or by Grantee and Issuer pursuant to
Section 8.01(a) thereof if Grantee shall at that time have been entitled to
terminate the Plan pursuant to Section 8.01(b)(i) or (ii) thereof (provided
that the breach of Issuer giving rise to such termination or such right to
terminate was willful). The events described in clauses (i)-(v) in the
preceding sentence are hereinafter collectively referred to as an "Exercise
Termination Event." Anything herein to the contrary notwithstanding, any
purchase of shares upon exercise of the Option shall be subject to compliance
with applicable law. The rights set forth in Section 7 hereof shall terminate
when the right to exercise the Option terminates (other than as a result of a
complete exercise of the Option) as set forth herein.
 
  (b) Preliminary Purchase Event. The term "Preliminary Purchase Event" shall
mean any of the following events or transactions occurring after the date
hereof:
 
    (i) Issuer or any of its subsidiaries (each, an "Issuer Subsidiary")
  shall have entered into an agreement to engage in an Acquisition
  Transaction (as defined below) with any Person (the term "Person" for
  purposes of this Agreement having the meaning assigned thereto in Sections
  3(a)(9) and 13(d)(3) of the Securities Exchange Act of 1934 (the "Exchange
  Act"), and the rules and regulations thereunder) other than Grantee or any
  of its subsidiaries (each a "Grantee Subsidiary") or the Board of Directors
  of Issuer shall have recommended that the shareholders of Issuer approve or
  accept any Acquisition Transaction with any Person other than Grantee or
  any Grantee Subsidiary. For purposes of this Agreement, "Acquisition
  Transaction" shall mean (x) a merger or consolidation, or any similar
  transaction, involving Issuer or any Issuer Subsidiary, (y) a purchase,
  lease or other acquisition of all or substantially all of the assets of or
  assumption of all or substantially all the deposits of Issuer or any Issuer
  Subsidiary or (z) a purchase or other acquisition (including by way of
  merger, consolidation, share exchange or otherwise) of securities
  representing 10% or more of the voting power of Issuer or any Issuer
  Subsidiary, provided that the term "Acquisition Transaction" does not
  include any internal merger or consolidation involving only Issuer and/or
  Issuer Subsidiaries;
 
    (ii) Any Person (other than Grantee or any Grantee Subsidiary or any
  Issuer Subsidiary acting in a fiduciary capacity in the ordinary course of
  business) shall have acquired Beneficial Ownership or the right to acquire
  Beneficial Ownership, of shares of Common Stock (the term "Beneficial
  Ownership" for purposes of this Agreement having the meaning assigned
  thereto in Section 13(d) of the Exchange Act, and the rules and regulations
  thereunder) such that, upon the consummation of such acquisition, such
  Person would have Beneficial Ownership, in the aggregate, of 10% or more of
  the then outstanding shares of Common Stock;
 
    (iii) Any Person other than Grantee or any Grantee Subsidiary shall have
  made a bona fide proposal to Issuer or its shareholders, by public
  announcement or written communication that is or becomes the subject of
  public disclosure, to engage in an Acquisition Transaction (including,
  without limitation, any situation in which any Person other than Grantee or
  any Grantee Subsidiary shall have commenced (as such term is defined in
  Rule 14d-2 under the Exchange Act) or shall have filed a registration
  statement under the Securities Act of 1933, as amended (the "Securities
  Act"), with respect to, a tender offer or exchange offer to purchase any
  shares of Common Stock such that, upon consummation of such offer, such
  Person would own or control 10% or more of the then outstanding shares of
  Common Stock (such an offer being referred to herein as a "Tender Offer" or
  an "Exchange Offer", respectively));
 
    (iv) After a proposal is made by a third party to Issuer or its
  shareholders to engage in an Acquisition Transaction, or such third party
  states its intention to make such a proposal if the Plan terminates and/or
  the Option expires, Issuer shall have breached any covenant or obligation
  contained in the Plan and such breach would entitle Grantee to terminate
  the Plan (without regard to the cure period provided for therein unless
  such cure is promptly effected without jeopardizing consummation of the
  Merger pursuant to the terms of the Plan);
 
                                      B-2
<PAGE>
 
    (v) The holders of Common Stock shall not have approved the Plan by the
  requisite vote at the meeting of such stockholders held for the purpose of
  voting on the Plan, or such meeting shall not have been held or shall have
  been canceled prior to termination of the Plan, in each case after it shall
  have been publicly announced that any Person (other than Grantee or any
  Grantee Subsidiary) shall have (A) made, or disclosed an intention to make,
  a bona fide proposal to engage in an Acquisition Transaction, (B) commenced
  a Tender Offer or filed a registration statement under the Securities Act
  with respect to an Exchange Offer or (C) filed an application (or given a
  notice) with, whether in draft of final form, the Board of Governors of the
  Federal Reserve System (the "Federal Reserve Board") or any other
  governmental authority or regulatory or administrative agency or commission
  (each, a "Governmental Authority"), for approval to engage in an
  Acquisition Transaction;
 
    (vi) Any Person (other than Grantee or any Grantee Subsidiary), other
  than in connection with a transaction to which Grantee has given its prior
  written consent, shall have filed an application or notice with the Federal
  Reserve Board or other Governmental Authority for approval to engage in an
  Acquisition Transaction; or
 
    (vii) The Issuer's Board of Directors shall have withdrawn or modified
  (or publicly announced its intention to withdraw or modify) in any manner
  adverse in any respect to Grantee its recommendation that the stockholders
  of Issuer approve the transactions contemplated by the Plan, or Issuer or
  any Issuer Subsidiary shall have authorized, recommended, proposed (or
  publicly announced its intention to authorize, recommend or propose) an
  agreement to engage in an Acquisition Transaction with any person other
  than Grantee or a Grantee Subsidiary.
 
  (c) Purchase Event. The term "Purchase Event" shall mean either of the
following events or transactions occurring after the date hereof:
 
    (i) The acquisition by any Person other than Grantee or any Grantee
  Subsidiary of Beneficial Ownership of shares of Common Stock, such that,
  upon the consummation of such acquisition, such Person would have
  Beneficial Ownership, in the aggregate, of 25% or more of the then
  outstanding shares of Common Stock; or
 
    (ii) The occurrence of a Preliminary Purchase Event described in Section
  2(b)(i) hereof except that the percentage referred to in clause (z) shall
  be 25%.
 
  (d) Notice by Issuer. Issuer shall notify Grantee promptly in writing of the
occurrence of any Preliminary Purchase Event or Purchase Event; provided,
however, that the giving of such notice by Issuer shall not be a condition to
the right of Grantee to exercise the Option.
 
  (e) Notice of Exercise. In the event that Grantee is entitled to and wishes
to exercise the Option, it shall send to Issuer a written notice (the "Option
Notice" and the date of which being hereinafter referred to as the "Notice
Date") specifying (i) the total number of shares of Common Stock it will
purchase pursuant to such exercise, (ii) the aggregate purchase price as
provided herein and (iii) a period of time (that shall not be less than three
business days nor more than thirty business days) running from the Notice Date
(the "Closing Date") and a place at which the closing of such purchase shall
take place; provided, that, if prior notification to or approval of the
Federal Reserve Board or any other Governmental Authority is required in
connection with such purchase (each, a "Notification" or an "Approval," as the
case may be), (a) Grantee shall promptly file, or cause to be filed, the
required notice or application for approval ("Notice/Application"), (b)
Grantee shall expeditiously process, or cause to be expeditiously processed,
the Notice/Application and (c) for the purpose of determining the Closing Date
pursuant to clause (iii) of this sentence, the period of time that otherwise
would run from the Notice Date shall instead run from the later of (x) in
connection with any Notification, the date on which any required notification
periods have expired or been terminated and (y) in connection with any
Approval, the date on which such approval has been obtained and any requisite
waiting period or periods shall have expired. For purposes of Section 2(a)
hereof, any exercise of the Option shall be deemed to occur on the Notice Date
relating thereto. On or prior to the Closing Date, Grantee shall have the
right to revoke its exercise of the Option in the
 
                                      B-3
<PAGE>
 
event that the transaction constituting a Purchase Event that gives rise to
such right to exercise shall not have been consummated.
 
  (f) Payments. At the closing referred to in Section 2(e) hereof, Grantee
shall present and surrender this Agreement and pay to Issuer the aggregate
Option Price for the shares of Common Stock specified in the Option Notice in
immediately available funds by wire transfer to a bank account designated by
Issuer; provided, however, that failure or refusal of Issuer to designate such
a bank account shall not preclude Grantee from exercising the Option.
 
  (g) Delivery of Common Stock. At such closing, simultaneously with the
delivery of immediately available funds as provided in Section 2(f) hereof,
Issuer shall deliver to Grantee a certificate or certificates representing the
number of shares of Common Stock specified in the Option Notice and, if the
Option should be exercised in part only, a new Option evidencing the rights of
Grantee thereof to purchase the balance of the shares of Common Stock
purchasable hereunder.
 
  (h) Common Stock Certificates. Certificates for Common Stock delivered at a
closing hereunder shall be endorsed with a restrictive legend substantially as
follows:
 
  The transfer of the shares represented by this certificate is subject to
  resale restrictions arising under the Securities Act of 1933, as amended,
  and to certain provisions of an agreement between Zions Bancorporation and
  Vectra Banking Corp. ("Issuer") dated as of the 23rd day of September,
  1997. A copy of such agreement is on file at the principal office of Issuer
  and will be provided to the holder hereof without charge upon receipt by
  Issuer of a written request therefor.
 
It is understood and agreed that: (i) the reference to the resale restrictions
of the Securities Act in the above legend shall be removed by delivery of
substitute certificate(s) without such reference if Grantee shall have
delivered to Issuer a copy of a letter from the staff of the Securities and
Exchange Commission (the "SEC"), or an opinion of counsel, in form and
substance reasonably satisfactory to Issuer, to the effect that such legend is
not required for purposes of the Securities Act; (ii) the reference to the
provisions of this Agreement in the above legend shall be removed by delivery
of substitute certificate(s) without such reference if the shares have been
sold or transferred in compliance with the provisions of this Agreement and
under circumstances that do not require the retention of such reference; and
(iii) the legend shall be removed in its entirety if the conditions in the
preceding clauses (i) and (ii) are both satisfied. In addition, such
certificates shall bear any other legend as may be required by law.
 
  (i) Holder of Record. Upon the giving by Grantee to Issuer of an Option
Notice and the tender of the applicable purchase price in immediately
available funds on the Closing Date, Grantee shall be deemed to be the holder
of record of the number of shares of Common Stock specified in the Option
Notice, notwithstanding that the stock transfer books of Issuer shall then be
closed or that certificates representing such shares of Common Stock shall not
then actually be delivered to Grantee. Issuer shall pay all expenses and any
and all United States federal, state and local taxes and other charges that
may be payable in connection with the preparation, issue and delivery of stock
certificates under this Section 2 in the name of Grantee.
 
  Section 3. Issuer's Covenants.
 
  (a) Available Shares. The Issuer agrees that it shall at all times until the
termination of this Agreement have reserved for issuance upon the exercise of
the Option that number of authorized and reserved shares of Common Stock equal
to the maximum number of shares of Common Stock at any time and from time to
time issuable hereunder, all of which shares will, upon issuance pursuant
hereto, be duly authorized, validly issued, fully paid, nonassessable, and
delivered free and clear of all claims, liens, encumbrances and security
interests and not subject to any preemptive rights.
 
  (b) Compliance. The Issuer agrees that it will not, by amendment of its
articles of incorporation or through reorganization, consolidation, merger,
dissolution or sale of assets, or by any other voluntary act, avoid or seek
 
                                      B-4
<PAGE>
 
to avoid the observance or performance of any of the covenants, stipulations
or conditions to be observed or performed hereunder by Issuer.
 
  (c) Certain Actions, Applications and Arrangements. Issuer shall promptly
take all action as may from time to time be required (including (i) complying
with all premerger notification, reporting and waiting period requirements
specified in 15 U.S.C. (S) 18a and regulations promulgated thereunder and (ii)
in the event, under the Bank Holding Company Act of 1956, as amended ("BHC
Act"), or the Change in Bank Control Act of 1978, as amended, or any state
banking law, prior approval of or notice to the Federal Reserve Board or to
any other Governmental Authority is necessary before the Option may be
exercised, cooperating with Grantee in preparing such applications or notices
and providing such information to each such Governmental Authority as it may
require) in order to permit Grantee to exercise the Option and Issuer duly and
effectively to issue shares of Common Stock pursuant hereto, and to protect
the rights of Grantee against dilution.
 
  Section 4. Exchange of Option. This Agreement and the Option granted hereby
are exchangeable, without expense, at the option of Grantee, upon presentation
and surrender of this Agreement at the principal office of Issuer, for other
agreements providing for Options of different denominations entitling the
holder thereof to purchase, on the same terms and subject to the same
conditions as are set forth herein, in the aggregate the same number of shares
of Common Stock purchasable hereunder. The terms "Agreement" and "Option" as
used in this Section 4 include any agreements and related options for which
this Agreement and the Option granted hereby may be exchanged. Upon receipt by
Issuer of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Agreement, and (in the case of loss, theft
or destruction) of reasonably satisfactory indemnification, and upon surrender
and cancellation of this Agreement, if mutilated, Issuer will execute and
deliver a new Agreement of like tenor and date. Any such new Agreement
executed and delivered shall constitute an additional contractual obligation
on the part of Issuer, whether or not the Agreement so lost, stolen, destroyed
or mutilated shall at any time be enforceable by anyone.
 
  Section 5. Adjustments. The number of shares of Common Stock purchasable
upon the exercise of the Option shall be subject to adjustment from time to
time as follows:
 
    (a) In the event of any change in the Common Stock by reason of stock
  dividends, split-ups, mergers, recapitalizations, combinations,
  subdivisions, conversions, exchanges of shares or the like, the type and
  number of shares of Common Stock purchasable upon exercise hereof shall be
  appropriately adjusted and proper provision shall be made so that, in the
  event that any additional shares of Common Stock are to be issued or
  otherwise to become outstanding as a result of any such change (other than
  pursuant to an exercise of the Option), the number of shares of Common
  Stock that remain subject to the Option shall be increased so that, after
  such issuance and together with shares of Common Stock previously issued
  pursuant to the exercise of the Option (as adjusted on account of any of
  the foregoing changes in the Common Stock), it represents the same
  proportion of the number of shares of Common Stock then issued and
  outstanding as such proportion before the applicable event described in
  this Section 5(a).
 
    (b) Whenever the number of shares of Common Stock purchasable upon
  exercise hereof is adjusted as provided in this Section 5, the Option Price
  shall be adjusted by multiplying the Option Price by a fraction, the
  numerator of which shall be equal to the number of shares of Common Stock
  purchasable prior to the adjustment and the denominator of which shall be
  equal to the number of shares of Common Stock purchasable after the
  adjustment.
 
  Section 6. Registration Rights. (a) Upon the occurrence of a Purchase Event
that occurs prior to an Exercise Termination Event, Issuer shall, at the
request of Grantee (whether on its own behalf or on behalf of any subsequent
holder of the Option (or part thereof) or any of the shares of Common Stock
issued pursuant hereto), promptly prepare, file and keep current a
registration statement under the Securities Act covering any shares issued and
issuable pursuant to the Option and shall use its best efforts to cause such
registration statement to become effective and remain current in order to
permit the sale or other disposition of any shares of Common Stock issued upon
total or partial exercise of the Option ("Option Shares") in accordance with
any plan of disposition requested by Grantee. The Issuer will use its best
efforts to cause such registration statement first to
 
                                      B-5
<PAGE>
 
become effective and then to remain effective for such period not in excess of
180 days from the day such registration statement first becomes effective.
Grantee shall have the right to demand two such registrations at the Issuer's
expense. The foregoing notwithstanding, if, at the time of any request by
Grantee for registration of Option Shares as provided above, Issuer is in the
process of registration with respect to an underwritten public offering of
shares of Common Stock, and if in the good faith judgment of the managing
underwriter or managing underwriters, or, if none, the sole underwriter or
underwriters, of such offering, the offering or inclusion of the Option Shares
would interfere materially with the successful marketing of the shares of
Common Stock offered by Issuer, the number of Option Shares otherwise to be
covered in the registration statement contemplated hereby may be reduced;
provided, however, that after any such required reduction, the number of
Option Shares to be included in such offering for the account of Grantee shall
constitute at least 33 1/3% of the total number of shares of Common Stock held
by Grantee and Issuer covered in such registration statement; provided
further, however, that if such reduction occurs, then Issuer shall file a
registration statement for the balance as promptly as practicable thereafter
as to which no reduction shall thereafter occur. In addition, if the Issuer
proposes to register its Common Stock or any other securities on a form that
would permit the registration of the Shares for public sale under the
Securities Act (whether proposed to be offered for sale by the Issuer or any
other Person) it will give prompt written notice to Grantee of its intention
to do so, specifying the relevant terms of such proposal, including the
proposed maximum offering price thereof. Upon the written notice of Grantee
(whether on its own behalf or on behalf of any subsequent holder of the Option
(or part thereof) or any of the shares of Common Stock issued pursuant hereto)
delivered to the Issuer within 20 business days after the giving of any such
notice, which request shall specify the number of Shares desired to be
disposed by Grantee, the Issuer will use its best efforts to effect, in
connection with its proposed registration, the registration under the
Securities Act of the Shares set forth in such request. Grantee shall be
entitled to two such registrations at the Issuer's expense. Grantee shall
provide all information reasonably requested by Issuer for inclusion in any
registration statement to be filed hereunder. In connection with any such
registration, Issuer and Grantee shall provide each other with
representations, warranties, indemnities and other agreements customarily
given in connection with such registrations. If requested by Grantee in
connection with such registration, Issuer and Grantee shall become a party to
any underwriting agreement relating to the sale of such shares, but only to
the extent of obligating themselves in respect of representations, warranties,
indemnities and other agreements customarily included in such underwriting
agreements.
 
  (b) In the event that Grantee requests Issuer to file a registration
statement following the failure to obtain any approval required to exercise
the Option as described in Section 9 hereof, the closing of the sale or other
disposition of the Common Stock or other securities pursuant to such
registration statement shall occur substantially simultaneously with the
exercise of the Option.
 
  (c) Except where applicable state law prohibits such payments, Issuer will
pay all expenses (including without limitation registration fees,
qualification fees, blue sky fees and expenses (including the fees and
expenses of counsel), legal expenses, including the reasonable fees and
expenses of one counsel to the holders whose Option Shares are being
registered, printing expenses and the costs of special audits or "cold
comfort" letters, expenses of underwriters, excluding discounts and
commissions but including liability insurance if Issuer so desires or the
underwriters so require, and the reasonable fees and expenses of any necessary
special experts) in connection with each registration pursuant to this Section
6 (including the related offerings and sales by holders of Option Shares) and
all other qualifications, notification or exemptions pursuant to this Section
6.
 
  (d) In connection with any registration under this Section 6, Issuer hereby
indemnifies the Grantee, and each officer, director and controlling person of
Grantee, and each underwriter thereof, including each person, if any who
controls such holder or underwriter within the meaning of Section 15 of the
Securities Act, against all expenses, losses, claims, damages and liabilities
caused by any untrue, or alleged untrue, statement contained in any
registration statement or prospectus or notification or offering circular
(including any amendments or supplements thereto) or any preliminary
prospectus, or caused by any omission, or alleged omission, to state therein a
material fact required to be stated therein or necessary to make the
statements therein not misleading, except insofar as such expenses, losses,
claims, damages or liabilities of such indemnified party are caused by
 
                                      B-6
<PAGE>
 
any untrue statement or alleged untrue statement that was included by Issuer
in any such registration statement or prospectus or notification or offering
circular (including any amendments or supplements thereto) in reliance upon
and in conformity with, information furnished in writing to Issuer by such
indemnified party expressly for use therein, and Issuer and each officer,
director and controlling person of Issuer shall be indemnified by such
Grantee, or by such underwriter, as the case may be, for all such expenses,
losses, claims, damages and liabilities caused by any untrue, or alleged
untrue, statement, that was included by Issuer in any such registration
statement or prospectus or notification or offering circular (including any
amendments or supplements thereto) in reliance upon, and in conformity with,
information furnished in writing to Issuer by such holder or such underwriter,
as the case may be, expressly for such use.
 
  Promptly upon receipt by a party indemnified under this Section 6(d) of
notice of the commencement of any action against such indemnified party in
respect of which indemnity or reimbursement may be sought against any
indemnifying party under this Section 6(d), such indemnified party shall
notify the indemnifying party in writing of the commencement of such action,
but the failure so to notify the indemnifying party shall not relieve it of
any liability which it may otherwise have to any indemnified party under this
Section 6(d). In case notice of commencement of any such action shall be given
to the indemnifying party as above provided, the indemnifying party shall be
entitled to participate in and, to the extent it may wish, jointly with any
other indemnifying party similarly notified, to assume the defense of such
action at its own expense, with counsel chosen by it and reasonably
satisfactory to such indemnified party. The indemnified party shall have the
right to employ separate counsel in any such action and participate in the
defense thereof, but the fees and expenses of such counsel (other than
reasonable costs of investigation) shall be paid by the indemnified party
unless (i) the indemnifying party either agrees to pay the same, (ii) the
indemnifying party fails to assume the defense of such action with counsel
reasonably satisfactory to the indemnified party, or (iii) the indemnified
party has been advised by counsel that one or more legal defenses may be
available to the indemnifying party that may be contrary to the interests of
the indemnified party. No indemnifying party shall be liable for the fees and
expenses of more than one separate counsel for all indemnified parties or for
any settlement entered into without its consent, which consent may not be
unreasonably withheld.
 
  If the indemnification provided for in this Section 6(d) is unavailable to a
party otherwise entitled to be indemnified in respect of any expenses, losses,
claims, damages or liabilities referred to herein, then the indemnifying
party, in lieu of indemnifying such party otherwise entitled to be
indemnified, shall contribute to the amount paid or payable by such party to
be indemnified as a result of such expenses, losses, claims, damages or
liabilities in such proportion as is appropriate to reflect the relative fault
of Issuer, the Grantee and the underwriters in connection with the statements
or omissions which resulted in such expenses, losses, claims, damages or
liabilities, as well as any other relevant equitable considerations. The
amount paid or payable by a party as a result of the expenses, losses, claims,
damages and liabilities referred to above shall be deemed to include any legal
or other fees or expenses reasonably incurred by such party in connection with
investigating or defending any action or claim; provided, however, that in no
case shall the Grantee be responsible, in the aggregate, for any amount in
excess of the net offering proceeds attributable to its Option Shares included
in the offering. No person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation. Any obligation by any Grantee to indemnify shall be several
and not joint with other holders of Option Shares.
 
  Section 7. Option Repurchase. (a) Upon the occurrence of a Purchase Event
that occurs prior to an Exercise Termination Event, (i) at the request (the
date of such request being the "Request Date") of Grantee, delivered within 30
days of the Purchase Event (or such later period as may be provided pursuant
to Section 9 hereof), Issuer shall repurchase the Option from Grantee at a
price (the "Option Repurchase Price") equal to (x) the amount by which (A) the
market/offer price (as defined below) exceeds (B) the Option Price, multiplied
by the number of shares for which the Option may then be exercised and (ii) at
the request (the date of such request being the "Request Date") of the owner
of Option Shares from time to time (the "Owner"), delivered within 30 days of
a Purchase Event (or such later period as may be provided pursuant to Section
9 hereof), Issuer shall repurchase such number of the Option Shares from the
Owner as the Owner shall designate at a price (the
 
                                      B-7
<PAGE>
 
"Option Share Repurchase Price") equal to (x) the market/offer price
multiplied by the number of Option Shares so designated. The term
"market/offer price" shall mean the highest of (i) the price per share of
Common Stock at which a tender offer or exchange offer therefor has been made
after the date hereof and on or prior to the Request Date, (ii) the price per
share of Common Stock paid or to be paid by any third party pursuant to an
agreement with Issuer (whether by way of a merger, consolidation or
otherwise), (iii) the highest closing price for shares of Common Stock within
the 90-day period ending on the Request Date as reported on NASDAQ (as
reported in The Wall Street Journal or, if not reported therein, in another
mutually agreed upon authoritative source) or (iv) in the event of a sale of
all or substantially all of Issuer's assets, the sum of the price paid in such
sale for such assets and the current market value of the remaining assets of
Issuer as determined by a nationally-recognized independent investment banking
firm mutually selected by Grantee or the Owner, as the case may be, on the one
hand, and Issuer, on the other hand, divided by the number of shares of Common
Stock of Issuer outstanding at the time of such sale. In determining the
market/offer price, the value of consideration other than cash shall be
determined by a nationally-recognized independent investment banking firm
mutually selected by Grantee or Owner, as the case may be, on the one hand,
and Issuer, on the other hand, whose determination shall be conclusive and
binding on all parties.
 
  (b) Grantee or the Owner, as the case may be, may exercise its right to
require Issuer to repurchase the Option and/or any Option Shares pursuant to
this Section 7 by surrendering for such purpose to Issuer, at its principal
office, a copy of this Agreement or certificates for Option Shares, as
applicable, accompanied by a written notice or notices stating that Grantee or
the Owner, as the case may be, elects to require Issuer to repurchase the
Option and/or the Option Shares in accordance with the provisions of this
Section 7. As immediately as practicable, and in any event within five
business days after the surrender of the Option and/or certificates
representing Option Shares and the receipt of such notice or notices relating
thereto, Issuer shall deliver or cause to be delivered to Grantee the Option
Repurchase Price or to the Owner the Option Share Repurchase Price or the
portion thereof that Issuer is not then prohibited from so delivering under
applicable law and regulation or as a consequence of administrative policy.
 
  (c) Issuer hereby undertakes to use its best efforts to obtain all required
regulatory and legal approvals and to file any required notices as promptly as
practicable in order to accomplish any repurchase contemplated by this Section
7. Nonetheless, to the extent that Issuer is prohibited under applicable law
or regulation, or as a consequence of administrative policy, from repurchasing
the Option and/or the Option Shares in full, Issuer shall
immediately so notify Grantee and/or the Owner and thereafter deliver or cause
to be delivered, from time to time, to Grantee and/or the Owner, as
appropriate, the portion of the Option Repurchase Price and the Option Share
Repurchase Price, respectively, that it is no longer prohibited from
delivering, within five business days after the date on which Issuer is no
longer so prohibited; provided, however, that if Issuer at any time after
delivery of a notice of repurchase pursuant to Section 7(b) is prohibited
under applicable law or regulation, or as a consequence of administrative
policy, from delivering to Grantee and/or the Owner, as appropriate, the
Option Repurchase Price and the Option Share Repurchase Price, respectively,
in full Grantee or Owner may revoke its notice of repurchase of the Option or
the Option Shares either in whole or in part whereupon, in the case of a
revocation in part, Issuer shall promptly (i) deliver to Grantee and/or the
Owner, as appropriate, that portion of the Option Purchase Price or the Option
Share Repurchase Price that Issuer is not prohibited from delivering after
taking into account any such revocation and (ii) deliver, as appropriate,
either (A) to Grantee, a new Agreement evidencing the right of Grantee to
purchase that number of shares of Common Stock equal to the number of shares
of Common Stock purchasable immediately prior to the delivery of the notice of
repurchase less the number of shares of Common Stock covered by the portion of
the Option repurchased or (B) to the Owner, a certificate for the number of
Option Shares covered by the revocation.
 
  (d) Issuer shall not enter into any agreement with any party (other than
Grantee or a Grantee Subsidiary) for an Acquisition Transaction unless the
other party thereto assumes all the obligations of Issuer pursuant to this
Section 7 in the event that a Grantee or Owner elects, in its sole discretion,
to require such other party to perform such obligations.
 
                                      B-8
<PAGE>
 
  Section 8. Substitute Option.
 
  (a) Grant of Substitute Option. In the event that prior to an Exercise
Termination Event, Issuer shall enter into an agreement (i) to consolidate or
merge with any Person, other than Grantee or a Grantee Subsidiary, and shall
not be the continuing or surviving corporation of such consolidation or
merger, (ii) to permit any Person, other than Grantee or a Grantee Subsidiary,
to merge into Issuer and Issuer shall be the continuing or surviving
corporation, but, in connection with such merger, the then outstanding shares
of Common Stock shall be changed into or exchanged for stock or other
securities of any other Person or cash or any other property or the then
outstanding shares of Common Stock shall after such merger represent less than
50% of the outstanding shares and share equivalents of the merged company, or
(iii) to sell or otherwise transfer all or substantially all of its or any
Issuer Subsidiary's assets to any Person, other than Grantee or a Grantee
Subsidiary, then, and in each such case, the agreement governing such
transaction shall make proper provision so that the Option shall, upon the
consummation of such transaction and upon the terms and conditions set forth
herein, be converted into, or exchanged for, an option (the "Substitute
Option"), at the election of Grantee, of either (x) the Acquiring Corporation
(as defined below) or (y) any Person that controls the Acquiring Corporation
(the Acquiring Corporation and any such controlling Person being hereinafter
referred to as the "Substitute Option Issuer").
 
  (b) Exercise of Substitute Option. The Substitute Option shall be
exercisable for such number of shares of the Substitute Common Stock (as is
hereinafter defined) as is equal to the market/offer price (as defined in
Section 7 hereof), multiplied by the number of shares of the Common Stock for
which the Option was theretofore exercisable, divided by the Average Price (as
is hereinafter defined). The exercise price of the Substitute Option per share
of the Substitute Common Stock (the "Substitute Purchase Price") shall then be
equal to the product of the Option Price multiplied by a fraction in which the
numerator is the number of shares of Common Stock for which the Option was
theretofore exercisable and the denominator is the number of shares for which
the Substitute Option is exercisable.
 
  (c) Terms of Substitute Option. The Substitute Option shall otherwise have
the same terms as the Option, provided, however, that if the terms of the
Substitute Option cannot, for legal reasons, be the same as the Option, such
terms shall be as similar as possible and in no event less advantageous to
Grantee.
 
  (d) Substitute Option Definitions. The following terms have the meanings
indicated:
 
    (i) "Acquiring Corporation" shall mean (i) the continuing or surviving
  corporation of a consolidation or merger with Issuer (if other than
  Issuer), (ii) Issuer in a merger in which Issuer is the continuing or
  surviving Person, and (iii) the transferee of all or any substantial part
  of the Issuer's assets (or the assets of any Issuer Subsidiary);
 
    (ii) "Substitute Common Stock" shall mean the common stock issued by the
  Substitute Option Issuer upon exercise of the Substitute Option; and
 
    (iii) "Average Price" shall mean the average closing price of a share of
  the Substitute Common Stock for the one year immediately preceding the
  consolidation, merger or sale in question, but in no event higher than the
  closing price of the shares of the Substitute Common Stock on the day
  preceding such consolidation, merger or sale; provided, however, that if
  such closing price is not ascertainable due to an absence of a public
  market for the Substitute Common Stock, "Average Price" shall mean the
  higher of (i) the price per share of Substitute Common Stock paid or to be
  paid by any third party pursuant to an agreement with the issuer of the
  Substitute Common Stock and (ii) the book value per share, calculated in
  accordance with generally accepted accounting principles, of the Substitute
  Common Stock immediately prior to exercise of the Substitute Option;
  provided, further, that if Issuer is the issuer of the Substitute Option,
  the Average Price shall be computed with respect to a share of common stock
  issued by Issuer, the Person merging into Issuer or by any company which
  controls or is controlled by such merging Person, as Grantee may elect.
 
  (e) Cap on Substitute Option. In no event, pursuant to any of the foregoing
paragraphs, shall the Substitute Option be exercisable for more than that
proportion of the outstanding Substitute Common Stock equal to the
 
                                      B-9
<PAGE>
 
proportion of the outstanding Common Stock of the Issuer which Grantee had the
right to acquire immediately prior to the issuance of the Substitute Option.
In the event that the Substitute Option would be exercisable for more than the
proportion of the outstanding Substitute Common Stock referred to in the
immediately preceding paragraph but for this clause (e), the Substitute Option
Issuer shall make a cash payment to Grantee equal to the excess of (i) the
value of the Substitute Option without giving effect to the limitation in this
clause (e) over (ii) the value of the Substitute Option after giving effect to
the limitation in this clause (e). This difference in value shall be
determined by a nationally recognized investment banking firm selected by
Grantee and reasonably acceptable to the Acquiring Corporation.
 
  Section 9. Extension of Exercise Right. Notwithstanding Sections 2, 6 and 7
and 11 hereof, if Grantee has given the notice referred to in one or more of
such Sections, the exercise of the rights specified in any such Section shall
be extended (a) if the exercise of such rights requires obtaining regulatory
approvals (including any required waiting periods) to the extent necessary to
obtain all regulatory approvals for the exercise of such rights, and (b) to
the extent necessary to avoid liability under Section 16(b) of the Exchange
Act by reason of such exercise; provided, however, that in no event shall any
closing date occur more than 6 months after the related Notice Date, and, if
the closing date shall not have occurred within such period due to the failure
to obtain any required approval by the Federal Reserve Board or any other
Governmental Authority despite the best efforts of Issuer or the Substitute
Option Issuer, as the case may be, to obtain such approvals, the exercise of
the Option shall be deemed to have been rescinded as of the related Notice
Date. In the event (a) Grantee receives official notice that an approval of
the Federal Reserve Board or any other Governmental Authority required for the
purchase and sale of the Option Shares will not be issued or granted or (b) a
closing date has not occurred within 6 months after the related Notice Date
due to the failure to obtain any such required approval, Grantee shall be
entitled to exercise the Option in connection with the resale of the Option
Shares pursuant to a registration statement as provided in Section 6.
 
  Section 10. Issuer's Representations and Warranties. Issuer hereby
represents and warrants to Grantee as follows:
 
  (a) Corporate Authority. Issuer has full corporate power and authority to
execute and deliver this Agreement and, subject to any approvals or consents
referred to herein, to consummate the transactions contemplated hereby. The
execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby have been duly authorized by the Board of
Directors of Issuer and no other corporate proceedings on the part of Issuer
are necessary to authorize this Agreement or to consummate the transactions so
contemplated. This Agreement has been duly authorized, executed and delivered
by the Issuer.
 
  (b) Availability of Shares. Issuer has taken all necessary corporate action
to authorize and reserve and to permit it to issue, and at all times from the
date hereof through the termination of this Agreement in accordance with its
terms will have reserved for issuance upon the exercise of the Option, that
number of shares of Common Stock equal to the maximum number of shares of
Common Stock at any time and from time to time issuable hereunder, and all
such shares, upon issuance pursuant hereto, will be duly authorized, validly
issued, fully paid, non-assessable, and will be delivered free and clear of
all claims, liens, encumbrances and security interests and not subject to any
preemptive rights.
 
  (c) No Violations. The execution, delivery and performance of this Agreement
does not or will not, and the consummation by Issuer of any of the
transactions contemplated hereby will not, constitute or result in (A) a
breach or violation of, or a default under, its articles of incorporation or
by-laws, or the comparable governing instruments of any of the Issuer
Subsidiaries, or (B) a breach or violation of, or a default under, any
agreement, lease, contract, note, mortgage, indenture, arrangement or other
obligation of it or any of the Issuer Subsidiaries (with or without the giving
of notice, the lapse of time or both) or under any law, rule, ordinance or
regulation or judgment, decree, order, award or governmental or non-
governmental permit or license to which it or any of the Issuer Subsidiaries
is subject, that would, in any case give any other person the ability to
prevent or enjoin Issuer's performance under this Agreement in any material
respect.
 
                                     B-10
<PAGE>
 
  Section 11. Grantee's Representations and Warranties. Grantee hereby
represents and warrants to issuer as follows:
 
  (a) Corporate Authority. Grantee has all requisite corporate power and
authority to enter into this Agreement and, subject to any approvals or
consents referred to herein, to consummate the transactions contemplated
hereby. The execution and deliver of this Agreement and the consummation of
the transactions contemplated hereby have been duly authorized by all
necessary corporate action on the part of Grantee. This Agreement has been
duly authorized, executed and delivered by Grantee.
 
  (b) Investment Intent. The Option is not being, and any shares of Common
Stock or other securities acquired by Grantee upon exercise of the Option will
not be, acquired with a view to the public distribution thereof and will not
be transferred or otherwise disposed of except in a transaction registered or
exempt from registration under the Securities Act.
 
  Section 12. Assignment. Neither of the parties hereto may assign any of its
rights or delegate any of its obligations under this Agreement or the Option
created hereunder to any other Person without the express written consent of
the other party, except that Grantee may assign this Agreement to a wholly
owned subsidiary of Grantee and Grantee may assign its rights hereunder in
whole or in part after the occurrence of a Preliminary Purchase Event;
provided, however, that until the date at which the Federal Reserve Board has
approved an application by Grantee under the BHC Act to acquire the shares of
Common Stock subject to the Option, other than to a wholly owned subsidiary of
Grantee, Grantee may not assign its rights under the Option except in (i) a
widely dispersed public distribution, (ii) a private placement in which no one
party acquires the right to purchase in excess of 2% of the voting shares of
Issuer, (iii) an assignment to a single party (e.g., a broker or investment
banker) for the purpose of conducting a widely dispersed public distribution
on Grantee's behalf, or (iv) any other manner approved by the Federal Reserve
Board. The term "Grantee" as used in this Agreement shall also be deemed to
refer to Grantee's permitted assigns. Any attempted assignment prohibited by
this Section 12 is void and without effect.
 
  Section 13. Filings and Consents. Each of Grantee and Issuer will use its
reasonable efforts to make all filings with, and to obtain consents of, all
third parties and Governmental Authorities necessary to the consummation of
the transactions contemplated by this Agreement, including, without
limitation, making application if necessary, for listing of the shares of
Common Stock issuable hereunder on any exchange or quotation system and
applying to the Federal Reserve Board under the BHC Act and to state banking
authorities for approval to acquire the shares issuable hereunder.
 
  Section 14. Remedies. The parties hereto acknowledge that damages would be
an inadequate remedy for a breach of this Agreement by either party hereto and
that the obligations of the parties shall hereto be enforceable by either
party hereto through injunctive or other equitable relief. Both parties
further agree to waive any requirement for the securing or posting of any bond
in connection with the obtaining of any such equitable relief and that this
provision is without prejudice to any other rights that the parties hereto may
have for any failure to perform this Agreement.
 
  Section 15. Severability. If any term, provision, covenant or restriction
contained in this Agreement is held by a court or a federal or state
regulatory agency of competent jurisdiction to be invalid, void or
unenforceable, the remainder of the terms, provisions and covenants and
restrictions contained in this Agreement shall remain in full force and
effect, and shall in no way be affected, impaired or invalidated.
 
  Section 16. Notices. All notices, requests, claims, demands and other
communications hereunder shall be deemed to have been duly given when
delivered in Person, by cable, telegram, telecopy or telex, or by registered
or certified mail (postage prepaid, return receipt requested) at the
respective addresses of the parties set forth in the Plan.
 
  Section 17. Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original, but all of
which shall constitute one and the same agreement and shall be effective at
the time of execution.
 
                                     B-11
<PAGE>
 
  Section 18. Expenses. Except as otherwise expressly provided herein, each of
the parties hereto shall bear and pay all costs and expenses incurred by it or
on its behalf in connection with the transactions contemplated hereunder,
including fees and expenses of its own financial consultants, investment
bankers, accountants and counsel.
 
  Section 19. Entire Agreement. Except as otherwise expressly provided herein
or in the Plan, this Agreement contains the entire agreement between the
parties with respect to the transactions contemplated hereunder and supersedes
all prior arrangements or understandings with respect thereof, written or
oral. The terms and conditions of this Agreement shall inure to the benefit of
and be binding upon the parties hereto and their respective successors and
permitted assigns. Nothing in this Agreement, expressed or implied, is
intended to confer upon any party, other than the parties hereto, and their
respective successors except as assigns, any rights, remedies, obligations or
liabilities under or by reason of this Agreement, except as expressly provided
herein.
 
  Section 20. Definitions. Capitalized terms used in this Agreement and not
defined herein but defined in the Plan shall have the meanings assigned
thereto in the Plan.
 
  Section 21. Effect on Plan. Nothing contained in this Agreement shall be
deemed to authorize Issuer or Grantee to breach any provision of the Plan.
 
  Section 22. Selections. In the event that any selection or determination is
to be made by Grantee hereunder and at the time of such selection or
determination there is more than one Grantee, such selection shall be made by
a majority in interest of such Grantees.
 
  Section 23. Further Assurances. In the event of any exercise of the option
by Grantee, Issuer and such Grantee shall execute and deliver all other
documents and instruments and take all other action that may be reasonably
necessary in order to consummate the transactions provided for by such
exercise.
 
  Section 24. Voting. Except to the extent Grantee exercises the Option,
Grantee shall have no rights to vote or receive dividends or have any other
rights as a shareholder with respect to shares of Common Stock covered hereby.
 
  Section 25. Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of the State of Utah.
 
  IN WITNESS WHEREOF, each of the parties has caused this Stock Option
Agreement to be executed on its behalf by their officers thereunto duly
authorized, all as of the date first above written.
 
                                          ZIONS BANCORPORATION
 
                                                    /s/ Dale M. Gibbons
                                          By: _________________________________
                                             Name: Dale M. Gibbons
                                             Title: Chief Financial Officer
 
                                          VECTRA BANKING CORP.
 
                                                      /s/ Gary S. Judd
                                          By: _________________________________
                                             Name: Gary S. Judd
                                             Title: President and Chief
                                              Executive Officer
 
 
                                     B-12
<PAGE>
 
                                                                     APPENDIX C
                         [LOGO OF THE WALLACH COMPANY]
 
                               November 21, 1997
 
The Board of Directors
Vectra Banking Corporation
1650 S. Colorado Blvd.
Suite 320
Denver, CO 80222
 
Members of the Board:
 
  You have requested our opinion as to the fairness, from a financial point of
view, to the shareholders of Vectra Banking Corporation (the "Company") of the
Merger Consideration (as defined below) in the proposed merger (the "Merger")
of the Company with and into Zions Bancorporation ("Zions"), pursuant to the
Merger Agreement dated as of September 23, 1997 (the "Agreement"). Under the
terms of the Agreement, each outstanding share of Company common stock, $0.01
par value, will be converted into 0.685 of a share of Zions common stock
("Zions Common Stock"), no par value, and each outstanding share of Company
preferred stock, $.01 par value, will be converted into 7.755 shares of Zions
Common Stock. The shares of Zions Common Stock to be issued in the Merger and
pursuant to the Agreement are herein referred to as the "Merger
Consideration."
 
  In arriving at our opinion, we have, among other things:
 
    i.   reviewed certain publicly available financial statements and other
         financial information not publicly available of the Company;
 
    ii.  reviewed the current condition and growth prospects for the Company
         and its subsidiary operations, including financial projections
         prepared by the Company management;
 
    iii. discussed the past and current operations and financial conditions
         and the prospects of the Company with Company management;
 
    iv.  reviewed the Company's historical stock trading activity and
         considered the prospect for value, liquidity, dividend yield and
         growth if the Company were to remain independent;
 
    v.   evaluated the economic, banking and competitive climate for banking
         institutions in Colorado, with special consideration given to recent
         transactions that may have increased the competitive environment in
         the financial services and banking industry;
 
    vi.  compared the Zions offer to recent transactions involving other
         institutions of similar size, to the extent publicly available;
 
    vii. examined the price and trading activity for Zions;
 
    viii. reviewed the implications for Company shareholders receiving Zions
          stock with regards to prospects for value, liquidity, dividend
          yield and growth;
 
    ix.  met with Zions' management and reviewed certain publicly available
         financial statements of Zions;
 
    x.   reviewed the Agreement.
 
  We have assumed without independent verification the accuracy and
completeness of the financial and other information regarding the Company that
was provided to us or obtained from publicly available sources. We have not
prepared or acquired an independent valuation or appraisal of any of the
assets of the Company and we have assumed without independent verification
that the aggregate allowances for loan losses of the Company
 
                                      C-1
<PAGE>
 
and Zions are adequate to cover such losses. With respect to business plans
and forecasts, we have assumed that they have been reasonably prepared on a
basis reflecting the best currently available estimates and judgments of
the management of the Company as to the future performance of the Company, its
subsidiaries and business units. Furthermore, we have assumed that the Merger
will be consummated on a timely basis in accordance with its terms and
pursuant to the Agreement. We have also taken into account our assessment of
general economic, market and financial conditions as they exist, as well as
our experience in connection with similar transactions and securities
valuations generally. Our opinion necessarily is based upon conditions as they
exist and can be evaluated as of the date of this opinion.
 
  The Wallach Company is an investment banking firm engaged in the valuation
of businesses and their securities in connection with mergers and
acquisitions, private placements, and valuations for corporate and other
purposes. The Wallach Company, as the Company's financial adviser, assisted
with the financial evaluation and negotiations leading to the Agreement for
which it has and will receive compensation.
 
  Based on our analysis of the foregoing, the assumptions described above and
upon such other factors we deem relevant, it is our opinion that, as of the
date hereof, the Merger Consideration is fair to the Company's shareholders
from a financial point of view.
                               LOGO
                                          The Wallach Company, Inc.
 
                                      C-2
<PAGE>
 
                                                                     APPENDIX D
 
                            ARTICLE 113 OF THE CBCA
 
                              DISSENTERS' RIGHTS
 
                                    PART 1
 
                     RIGHT OF DISSENT--PAYMENT FOR SHARES
 
7-113-101. DEFINITIONS. For purposes of this article:
 
  (1) "Beneficial shareholder" means the beneficial owner of shares held in a
voting trust or by a nominee as the record shareholder.
 
  (2) "Corporation" means the issuer of the shares held by a dissenter before
the corporate action, or the surviving or acquiring domestic or foreign
corporation, by merger or share exchange of that issuer.
 
  (3) "Dissenter" means a shareholder who is entitled to dissent from
corporate action under section 7-113-102 and who exercises that right at the
time and in the manner required by part 2 of this article.
 
  (4) "Fair value", with respect to a dissenter's shares, means the value of
the shares immediately before the effective date of the corporate action to
which the dissenter objects, excluding any appreciation or depreciation in
anticipation of the corporate action except to the extent that exclusion would
be inequitable.
 
  (5) "Interest" means interest from the effective date of the corporate
action until the date of payment, at the average rate currently paid by the
corporation on its principal bank loans or, if none, at the legal rate as
specified in section 5-12-101, C.R.S.
 
  (6) "Record shareholder" means the person in whose name shares are
registered in the records of a corporation or the beneficial owner of shares
that are registered in the name of a nominee to the extent such owner is
recognized by the corporation as the shareholder as provided in section 7-107-
204.
 
  (7) "Shareholder" means either a record shareholder or a beneficial
shareholder.
 
7-113-102. RIGHT TO DISSENT
 
  (1) A shareholder, whether or not entitled to vote, is entitled to dissent
and obtain payment of the fair value of the shareholder's shares in the event
of any of the following corporate actions:
 
    (a) Consummation of a plan of merger to which the corporation is a party
  if:
 
      (I) Approval by the shareholders of that corporation is required for
    the merger bysection 7-111-103 or 7-111-104 or by the articles of
    incorporation; or
 
      (II) The corporation is a subsidiary that is merged with its parent
    corporation undersection 7-111-104;
 
    (b) Consummation of a plan of share exchange to which the corporation is
  a party as the corporation whose shares will be acquired;
 
    (c) Consummation of a sale, lease, exchange, or other disposition of all,
  or substantially all, of the property of the corporation for which a
  shareholder vote is required under section 7-112-102(1); and
 
    (d) Consummation of a sale, lease, exchange, or other disposition of all,
  or substantially all, of the property of an entity controlled by the
  corporation if the shareholders of the corporation were entitled to vote
  upon the consent of the corporation to the disposition pursuant to section
  7-112-102(2).
 
                                      D-1
<PAGE>
 
  (1.3) A shareholder is not entitled to dissent and obtain payment, under
subsection (1) of this section, of the fair value of the shares of any class
or series of shares which either were listed on a national securities exchange
registered under the federal "Securities Exchange Act of 1934", as amended, or
on the national market system of the National Association of Securities
Dealers Automated Quotation System, or were held of record by more than two
thousand shareholders, at the time of:
 
    (a) The record date fixed under section 7-107-107 to determine the
  shareholders entitled to receive notice of the shareholders' meeting at
  which the corporate action is submitted to a vote;
 
    (b) The record date fixed under section 7-107-104 to determine
  shareholders entitled to sign writings consenting to the corporate action;
  or
 
    (c) The effective date of the corporate action if the corporate action is
  authorized other than by a vote of shareholders.
 
  (1.8) The limitation set forth in subsection (1.3) of this section shall not
apply if the shareholder will receive for the shareholder's shares, pursuant
to the corporate action, anything except:
 
    (a) Shares of the corporation surviving the consummation of the plan of
  merger or share exchange;
 
    (b) Shares of any other corporation which at the effective date of the
  plan of merger or share exchange either will be listed on a national
  securities exchange registered under the federal "Securities Exchange Act
  of 1934", as amended, or on the national market system of the National
  Association of Securities Dealers Automated Quotation System, or will be
  held of record by more than two thousand shareholders;
 
    (c) Cash in lieu of fractional shares; or
 
    (d) Any combination of the foregoing described shares or cash in lieu of
  fractional shares.
 
  (2.5) A shareholder, whether or not entitled to vote, is entitled to dissent
and obtain payment of the fair value of the shareholder's shares in the event
of a reverse split that reduces the number of shares owned by the shareholder
to a fraction of a share or to scrip if the fractional share or scrip so
credited is to be acquired for cash or the scrip is to be voided under section
7-106-104.
 
  (3) A shareholder is entitled to dissent and obtain payment of the fair
value of the shareholder's shares in the event of any corporate action to the
extent provided by the bylaws or a resolution of the board of directors.
 
  (4) A shareholder entitled to dissent and obtain payment for the
shareholder's shares under this article may not challenge the corporate action
creating such entitlement unless the action is unlawful or fraudulent with
respect to the shareholder or the corporation.
 
7-113-103. DISSENT BY NOMINEES AND BENEFICIAL OWNERS
 
  (1) A record shareholder may assert dissenters' rights as to fewer than all
the shares registered in the record shareholder's name only if the record
shareholder dissents with respect to all shares beneficially owned by any one
person and causes the corporation to receive written notice which states such
dissent and the name, address, and federal taxpayer identification number, if
any, of each person on whose behalf the record shareholder asserts dissenters'
rights. The rights of a record shareholder under this subsection (1) are
determined as if the shares as to which the record shareholder dissents and
the other shares of the record shareholder were registered in the names of
different shareholders.
 
  (2) A beneficial shareholder may assert dissenters' rights as to the shares
held on the beneficial shareholder's behalf only if:
 
    (a) The beneficial shareholder causes the corporation to receive the
  record shareholder's written consent to the dissent not later than the time
  the beneficial shareholder asserts dissenters' rights; and
 
                                      D-2
<PAGE>
 
    (b) The beneficial shareholder dissents with respect to all shares
  beneficially owned by the beneficial shareholder.
 
  (3) The corporation may require that, when a record shareholder dissents
with respect to the shares held by any one or more beneficial shareholders,
each such beneficial shareholder must certify to the corporation that the
beneficial shareholder and the record shareholder or record shareholders of
all shares owned beneficially by the beneficial shareholder have asserted, or
will timely assert, dissenters' rights as to all such shares as to which there
is no limitation on the ability to exercise dissenters' rights. Any such
requirement shall be stated in the dissenters' notice given pursuant to
section 7-113-203.
 
                                    PART 2
 
                 PROCEDURE FOR EXERCISE OF DISSENTERS' RIGHTS
 
7-113-201. NOTICE OF DISSENTERS' RIGHTS
 
  (1) If a proposed corporate action creating dissenters' rights under section
7-113-102 is submitted to a vote at a shareholder's meeting, the notice of the
meeting shall be given to all shareholders, whether or not entitled to vote.
The notice shall state that shareholders are or may be entitled to assert
dissenters' rights under this article and shall be accompanied by a copy of
this article and the materials, if any, that, under articles 101 to 117 of
this title, are required to be given to shareholders entitled to vote on the
proposed action at the meeting. Failure to give notice as provided by this
subsection (1) shall not affect any action taken at the shareholders' meeting
for which the notice was to have been given, but any shareholder who was
entitled to dissent but who was not given such notice shall not be precluded
from demanding payment for the shareholder's shares under this article by
reason of the shareholder's failure to comply with the provisions of section
7-113-202(1).
 
  (2) If a proposed corporate action creating dissenters' rights under section
7-113-102 is authorized without a meeting of shareholders pursuant to section
7-107-104, any written or oral solicitation of a shareholder to execute a
writing consenting to such action contemplated in section 7-107-104 shall be
accompanied or preceded by a written notice stating that shareholders are or
may be entitled to assert dissenters' rights under this article, by a copy of
this article, and by the materials, if any, that, under articles 101 to 117 of
this title, would have been required to be given to shareholders entitled to
vote on the proposed action if the proposed action were submitted to a vote at
a shareholders' meeting. Failure to give notice as provided by this subsection
(2) shall not affect any action taken pursuant to section 7-107-104 for which
the notice was to have been given, but any shareholder who was entitled to
dissent but who was not given such notice shall not be precluded from
demanding payment for the shareholder's shares under this article by reason of
the shareholder's failure to comply with the provisions of section 7-113-
202(2).
 
7-113-202. NOTICE OF INTENT TO DEMAND PAYMENT
 
  (1) If a proposed corporate action creating dissenters' rights under section
7-113-102 is submitted to a vote at a shareholders' meeting and if notice of
dissenters' rights has been given to such shareholder in connection with the
action pursuant to section 7-113-201(1), a shareholder who wishes to assert
dissenters' rights shall:
 
    (a) Cause the corporation to receive, before the vote is taken, written
  notice of the shareholder's intention to demand payment for the
  shareholder's shares if the proposed corporate action is effectuated; and
 
    (b) Not vote the shares in favor of the proposed corporate action.
 
  (2) If a proposed corporate action creating dissenters' rights under section
7-113-102 is authorized without a meeting of shareholders pursuant to section
7-107-104 and if notice of dissenters' rights has been given to such
shareholder in connection with the action pursuant to section 7-113-201(2) a
shareholder who wishes to assert dissenters' rights shall not execute a
writing consenting to the proposed corporate action.
 
                                      D-3
<PAGE>
 
  (3) A shareholder who does not satisfy the requirements of subsection (1) or
(2) of this section is not entitled to demand payment for the shareholder's
shares under this article.
 
7-113-203. DISSENTERS' NOTICE
 
  (1) If a proposed corporate action creating dissenters' rights under section
7-113-102 is authorized, the corporation shall give a written dissenters'
notice to all shareholders who are entitled to demand payment for their shares
under this article.
 
  (2) The dissenters' notice required by subsection (1) of this section shall
be given no later than ten days after the effective date of the corporate
action creating dissenters' rights under section 7-113-102 and shall:
 
    (a) State that the corporate action was authorized and state the
  effective date or proposed effective date of the corporate action;
 
    (b) State an address at which the corporation will receive payment
  demands and the address of a place where certificates for certificated
  shares must be deposited;
 
    (c) Inform holders of uncertificated shares to what extent transfer of
  the shares will be restricted after the payment demand is received;
 
    (d) Supply a form for demanding payment, which form shall request a
  dissenter to state an address to which payment is to be made;
 
    (e) Set the date by which the corporation must receive the payment demand
  and certificates for certificated shares, which date shall not be less than
  thirty days after the date the notice required by subsection (1) of this
  section is given;
 
    (f) State the requirement contemplated in section 7-113-103(3), if such
  requirement is imposed; and
 
    (g) Be accompanied by a copy of this article.
 
7-113-204. PROCEDURE TO DEMAND PAYMENT
 
  (1) A shareholder who is given a dissenters' notice pursuant to section 7-
113-203 and who wishes to assert dissenters' rights shall, in accordance with
the terms of the dissenters' notice:
 
    (a) Cause the corporation to receive a payment demand, which may be the
  payment demand form contemplated in section 7-113-203(2)(d), duly
  completed, or may be stated in another writing; and
 
    (b) Deposit the shareholder's certificates for certificated shares.
 
  (2) A shareholder who demands payment in accordance with subsection (1) of
this section retains all rights of a shareholder, except the right to transfer
the shares, until the effective date of the proposed corporate action giving
rise to the shareholder's exercise of dissenters' rights and has only the
right to receive payment for the shares after the effective date of such
corporate action.
 
  (3) Except as provided in section 7-113-207 or 7-113-209(1)(b), the demand
for payment and deposit of certificates are irrevocable.
 
  (4) A shareholder who does not demand payment and deposit the shareholder's
share certificates as required by the date or dates set in the dissenters'
notice is not entitled to payment for the shares under this article.
 
7-113-205. UNCERTIFICATED SHARES
 
  (1) Upon receipt of a demand for payment under section 7-113-204 from a
shareholder holding uncertificated shares, and in lieu of the deposit of
certificates representing the shares, the corporation may restrict the
transfer thereof.
 
                                      D-4
<PAGE>
 
  (2) In all other respects, the provisions of section 7-113-204 shall be
applicable to shareholders who own uncertificated shares.
 
7-113-206. PAYMENT.
 
  (1) Except as provided in section 7-113-208, upon the effective date of the
corporate action creating dissenters' rights under section 7-113-102 or upon
receipt of a payment demand pursuant to section 7-113-204, whichever is later,
the corporation shall pay each dissenter who complied with section 7-113-204,
at the address stated in the payment demand, or if no such address is stated
in the payment demand, at the address shown on the corporation's current
record of shareholders for the record shareholder holding the dissenter's
shares, the amount the corporation estimates to be the fair value of the
dissenter's shares, plus accrued interest.
 
  (2) The payment made pursuant to subsection (1) of this section shall be
accompanied by:
 
    (a) The corporation's balance sheet as of the end of its most recent
  fiscal year or, if that is not available, the corporation's balance sheet
  as of the end of a fiscal year ending not more than sixteen months before
  the date of payment, an income statement for that year, and, if the
  corporation customarily provides such statements to shareholders, a
  statement of changes in shareholders' equity for that year and a statement
  of cash flow for that year, which balance sheet and statements shall have
  been audited if the corporation customarily provides audited financial
  statements to shareholders, as well as the latest available financial
  statements, if any, for the interim or full-year period, which financial
  statements need not be audited;
 
    (b) A statement of the corporation's estimate of the fair value of the
  shares;
 
    (c) An explanation of how the interest was calculated;
 
    (d) A statement of the dissenters' right to demand payment under section
  7-113-209; and
 
    (e) A copy of this article.
 
7-113-207. FAILURE TO TAKE ACTION.
 
  (1) If the effective date of the corporate action creating dissenters'
rights under section 7-113-102 does not occur within sixty days after the date
set by the corporation by which the corporation must receive the payment
demand as provided in section 7-113-203, the corporation shall return the
deposited certificates and release the transfer restrictions imposed on
uncertificated shares.
 
  (2) If the effective date of the corporate action creating dissenters'
rights under section 7-113-102 occurs more than sixty days after the date set
by the corporation by which the corporation must receive the payment demand as
provided in section 7-113-203, then the corporation shall send a new
dissenters' notice, as provided in section 7-113-203, and the provisions of
sections 7-113-204 to 7-113-209 shall again be applicable.
 
7-113-208. SPECIAL PROVISIONS RELATING TO SHARES ACQUIRED AFTER ANNOUNCEMENT
        OF PROPOSED CORPORATE ACTION
 
  (1) The corporation may, in or with the dissenters' notice given pursuant to
section 7-113-203, state the date of the first announcement to news media or
to shareholders of the terms of the proposed corporate action creating
dissenters' rights under section 7-113-102 and state that the dissenter shall
certify in writing, in or with the dissenter's payment demand under section 7-
113-204, whether or not the dissenter (or the person on whose behalf
dissenters' rights are asserted) acquired beneficial ownership of the shares
before that date. With respect to any dissenter who does not so certify in
writing, in or with the payment demand, that the dissenter or the person on
whose behalf the dissenter asserts dissenters' rights acquired beneficial
ownership of the shares before such date, the corporation may, in lieu of
making the payment provided in section 7-113-206, offer to make such payment
if the dissenter agrees to accept it in full satisfaction of the demand.
 
  (2) An offer to make payment under subsection (1) of this section shall
include or be accompanied by the information required by section 7-113-206(2).
 
                                      D-5
<PAGE>
 
7-113-209. PROCEDURE IF DISSENTER IS DISSATISFIED WITH PAYMENT OR OFFER.
 
  (1) A dissenter may give notice to the corporation in writing of the
dissenter's estimate of the fair value of the dissenter's shares and of the
amount of interest due and may demand payment of such estimate, less any
payment made under section 7-113-206, or reject the corporation's offer under
section 7-113-208 and demand payment of the fair value of the shares and
interest due, if:
 
    (a) The dissenter believes that the amount paid under section 7-113-206
  or offered undersection 7-113-208 is less than the fair value of the shares
  or that the interest due was incorrectly calculated;
 
    (b) The corporation fails to make payment under section 7-113-206 within
  sixty days after the date set by the corporation by which the corporation
  must receive the payment demand; or
 
    (c) The corporation does not return the deposited certificates or release
  the transfer restrictions imposed on uncertificated shares as required by
  Section 7-113-207(1).
 
  (2) A dissenter waives the right to demand payment under this section unless
the dissenter causes the corporation to receive the notice required by
subsection (1) of this section within thirty days after the corporation made
or offered payment for the dissenter's shares.
 
                                    PART 3
 
                         JUDICIAL APPRAISAL OF SHARES
 
7-113-301. COURT ACTION
 
  (1) If a demand for payment under section 7-113-209 remains unresolved, the
corporation may, within sixty days after receiving the payment demand,
commence a proceeding and petition the court to determine the fair value of
the shares and accrued interest. If the corporation does not commence the
proceeding within the sixty-day period, it shall pay to each dissenter whose
demand remains unresolved the amount demanded.
 
  (2) The corporation shall commence the proceeding described in subsection
(1) of this section in the district court of the county in this state where
the corporation's principal office is located or, if the corporation has no
principal office in this state, in the district court of the county in which
its registered office is located. If the corporation is a foreign corporation
without a registered office, it shall commence the preceding in the county
where the registered office of the domestic corporation merged into, or whose
shares were acquired by, the foreign corporation was located.
 
  (3) The corporation shall make all dissenters, whether or not residents of
this state, whose demands remain unresolved parties to the proceeding
commenced under subsection (2) of this section as in an action against their
shares, and all parties shall be served with a copy of the petition. Service
on each dissenter shall be by registered or certified mail, to the address
stated in such dissenter's payment demand, or if no such address is stated in
the payment demand, at the address shown on the corporation's current record
of shareholders for the record shareholder holding the dissenter's shares, or
as provided by law.
 
  (4) The jurisdiction of the court in which the proceeding is commenced under
subsection (2) of this section is plenary and exclusive. The court may appoint
one or more persons as appraisers to receive evidence and recommend a decision
on the question of fair value. The appraisers have the powers described in the
order appointing them, or in any amendment to such order. The parties to the
proceeding are entitled to the same discovery rights as parties in other civil
proceedings.
 
  (5) Each dissenter made a party to the proceeding commenced under subsection
(2) of this section is entitled to judgment for the amount, if any, by which
the court finds the fair value of the dissenter's shares, plus interest,
exceeds the amount paid by the corporation, or for the fair value, plus
interest, of the dissenter's shares for which the corporation elected to
withhold payment under section 7-113-208.
 
                                      D-6
<PAGE>
 
7-113-302. COURT COSTS AND COUNSEL FEES.
 
  (1) The court in an appraisal proceeding commenced under section 7-113-301
shall determine all costs of the proceeding, including the reasonable
compensation and expenses of appraisers appointed by the court. The court
shall assess the costs against the corporation; except that the court may
assess costs against all or some of the dissenters, in amounts the court finds
equitable, to the extent the court finds the dissenters acted arbitrarily,
vexatiously, or not in good faith in demanding payment under section 7-113-
209.
 
  (2) The court may also assess the fees and expenses of counsel and experts
for the respective parties, in amounts the court finds equitable:
 
    (a) Against the corporation and in favor of any dissenters if the court
  finds the corporation did not substantially comply with the requirements of
  part 2 of this article; or
 
    (b) Against either the corporation or one or more dissenters, in favor of
  any other party, if the court finds that the party against whom the fees
  and expenses are assessed acted arbitrarily, vexatiously, or not in good
  faith with respect to the rights provided by this article.
 
  (3) If the court finds that the services of counsel for any dissenter were
of substantial benefit to other dissenters similarly situated, and that the
fees for those services should not be assessed against the corporation, the
court may award to said counsel reasonable fees to be paid out of the amounts
awarded to the dissenters who were benefitted.
 
                                      D-7
<PAGE>
 
                                    PART II
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  Utah law provides for indemnification of directors and officers as follows:
 
16-10a-902 AUTHORITY TO INDEMNIFY DIRECTORS.
 
  (1) Except as provided in Subsection (4), a corporation may indemnify an
individual made a party to a proceeding because he is or was a director,
against liability incurred in the proceeding if:
 
    (a) his conduct was in good faith; and
 
    (b) he reasonably believed that his conduct was in, or not opposed to,
  the corporation's best interests; and
 
    (c) in the case of any criminal proceeding, he had no reasonable cause to
  believe his conduct was unlawful.
 
  (2) A director's conduct with respect to any employee benefit plan for a
purpose he reasonably believed to be in or not opposed to the interests of the
participants in and beneficiaries of the plan is conduct that satisfies the
requirement of Subsection (1)(b).
 
  (3) The termination of a proceeding by judgment, order, settlement,
conviction, or upon a plea of nolo contendere or its equivalent is not, of
itself, determinative that the director did not meet the standard of conduct
described in this section.
 
  (4) A corporation may not indemnify a director under this section:
 
    (a) in connection with a proceeding by or in the right of the corporation
  in which the director was adjudged liable to the corporation; or
 
    (b) in connection with any other proceeding charging that the director
  derived an improper personal benefit, whether or not involving action in
  his official capacity, in which proceeding he was adjudged liable on the
  basis that he derived an improper personal benefit.
 
  (5) Indemnification permitted under this section in connection with a
proceeding by or in the right of the corporation is limited to reasonable
expenses incurred in connection with the proceeding.
 
16-10a-903 MANDATORY INDEMNIFICATION OF DIRECTORS.
 
  Unless limited by its articles of incorporation, a corporation shall
indemnify a director who was successful, on the merits or otherwise, in the
defense of any proceeding, or in the defense of any claim, issue, or matter in
the proceeding, to which he was a party because he is or was a director of the
corporation, against reasonable expenses incurred by him in connection with
the proceeding or claim with respect to which he has been successful.
 
16-10a-907 INDEMNIFICATION OF OFFICERS, EMPLOYEES, FIDUCIARIES, AND AGENTS.
 
  Unless a corporation's articles of incorporation provide otherwise:
 
  (1) an officer of the corporation is entitled to mandatory indemnification
under Section 16-10a-903, and is entitled to apply for court-ordered
indemnification under Section 16-10a-905, in each case to the same extent as a
director;
 
  (2) the corporation may indemnify and advance expenses to an officer,
employee, fiduciary, or agent of the corporation to the same extent as to a
director; and
 
                                     II-1
<PAGE>
 
  (3) a corporation may also indemnify and advance expenses to an officer,
employee, fiduciary, or agent who is not a director to a greater extent, if
not inconsistent with public policy, and if provided for by its articles of
incorporation, bylaws, general or specific action of its board of directors,
or contract.
 
16-10a-908 INSURANCE.
 
  A corporation may purchase and maintain liability insurance on behalf of
person who is or was a director, officer, employee, fiduciary, or agent of the
corporation, or who, while serving as a director, officer, employee,
fiduciary, or agent of the corporation, is or was serving at the request of
the corporation as a director, officer, partner, trustee, employee, fiduciary,
or agent of another foreign or domestic corporation or other person, or of an
employee benefit plan, against liability asserted against or incurred by him
in that capacity or arising from his status as a director, officer, employee,
fiduciary, or agent, whether or not the corporation would have power to
indemnify him against the same liability under Sections 16-10a-902, 16-10a-
903, or 16-10a-907. Insurance may be procured from any insurance company
designated by the board of directors, whether the insurance company is formed
under the laws of this state or any other jurisdiction of the United States or
elsewhere, including any insurance company in which the corporation has an
equity or any other interest through stock ownership or otherwise.
 
16-10a-909 LIMITATIONS OF INDEMNIFICATION OF DIRECTORS.
 
  (1) A provision treating a corporation's indemnification of, or advance for
expenses to, directors that is contained in its articles of incorporation or
bylaws, in a resolution of its shareholders or board of directors, or in a
contract (except an insurance policy) or otherwise, is valid only if and to
the extent the provision is not inconsistent with this part. If the articles
of incorporation limit indemnification or advance of expenses, indemnification
and advance of expenses are valid only to the extent not inconsistent with the
articles of incorporation.
 
  (2) This part does not limit a corporation's power to pay or reimburse
expenses incurred by a director in connection with the director's appearance
as a witness in a proceeding at a time when the director has not been made a
named defendant or respondent to the proceeding.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
  (a) Exhibits. An Exhibit Index, containing a list of all exhibits filed with
this Registration Statement, is included beginning on page II-7.
 
  (b) Financial Statement Schedules. Not applicable.
 
  (c) Report, Opinion or Appraisal. Not applicable.
 
ITEM 22. UNDERTAKINGS.
 
  The undersigned registrant hereby undertakes as follows:
 
  (1) that, for purposes of determining any liability under the Securities Act
of 1933, each filing of the registrant's annual report pursuant to Section
13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is
incorporated by reference in the registration statement shall be deemed to be
a new registration statement relating to the securities offered therein, and
the offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof.
 
  (2) to deliver or cause to be delivered with the prospectus, to each person
to whom the prospectus is sent or given, the latest annual report to security
holders that is incorporated by reference in the prospectus and furnished
pursuant to and meeting the requirements of Rule 14a-3 or Rule 14c-3 under the
Securities Exchange Act of 1934; and, where interim financial information
required to be presented by Article 3 of Regulation S-X is
 
                                     II-2
<PAGE>
 
not set forth in the prospectus, to deliver, or cause to be delivered to each
person to whom the prospectus is sent or given, the latest quarterly report
that is specifically incorporated by reference in the prospectus to provide
such interim financial information.
 
  (3) that prior to any public reoffering of the securities registered
hereunder through the use of a prospectus which is a part of this registration
statement, by any person or party who is deemed to be an underwriter within
the meaning of Rule 145(c), such reoffering prospectus will contain the
information called for by the applicable registration form with respect to
reofferings by persons who may be deemed underwriters, in addition to the
information called for by the other items of the applicable form.
 
  (4) that every prospectus (i) that is filed pursuant to paragraph (3)
immediately preceding, or (ii) that purports to meet the requirements of
Section 10(a)(3) of the Securities Act of 1933, as amended, and is used in
connection with an offering of securities subject to Rule 415, will be filed
as a part of an amendment to the registration statement and will not be used
until such amendment is effective, and that, for purposes of determining any
liability under the Securities Act of 1933, each such post-effective amendment
shall be deemed to be a new registration statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof.
 
  (5) that insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the registrant pursuant to the provisions described under Item 20
above, or otherwise, the registrant has been advised that in the opinion of
the Securities and Exchange Commission such indemnification is against public
policy as expressed in the Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the registrant of expenses incurred or paid by a director, officer
or controlling person of the registrant in the successful defense of any
action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, the
registrant will, unless in the opinion of its counsel the matter has been
settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication
of such issue.
 
  (6) to respond to requests for information that is incorporated by reference
into the Proxy Statement-Prospectus pursuant to Items 4, 10(b), 11 or 13 of
Form S-4, within one business day of receipt of such request, and to send the
incorporated documents by first class mail or other equally prompt means. This
includes information contained in documents filed subsequent to the Effective
Date of the registration statement through the date of responding to the
request.
 
  (7) to supply by means of a post-effective amendment all information
concerning a transaction, and the company being acquired involved therein,
that was not the subject of and included in the registration statement when it
became effective.
 
                                     II-3
<PAGE>
 
                                  SIGNATURES
 
  Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in Salt Lake City, Utah, on the 1st
day of October, 1997.
 
                                          ZIONS BANCORPORATION
 
                                                 /s/ Harris A. Simmons
                                          By: _________________________________
                                                    Harris H. Simmons,
                                               President and Chief Executive
                                                          Officer
 
                               POWER OF ATTORNEY
 
  KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Harris H. Simmons, Roy W. Simmons, and Dale M.
Gibbons, and each of them, his true and lawful attorneys-in-fact and agents,
with full power of substitution and resubstitution, for him and in his name,
place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this registration statement, and to
file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or either
of them, or their or his substitutes, may lawfully do or cause to be done by
virtue thereof.
 
  Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
             SIGNATURE                         CAPACITY                   DATE
             ---------                         --------                   ----
<S>                                  <C>                           <C>
      /s/ Harris H. Simmons          President, Chief Executive       October 1, 1997
____________________________________  Officer and Director
         Harris H. Simmons


      /s/ Dale M. Gibbons            Senior Vice President and        October 1, 1997
____________________________________  Chief Financial Officer
          Dale M. Gibbons


       /s/ Walter E. Kelly           Controller                       October 1, 1997
____________________________________
          Walter E. Kelly


        /s/ Roy W. Simmons           Chairman and Director            October 1, 1997
____________________________________
           Roy W. Simmons


        /s/ Jerry C. Atkin           Director                         October 1, 1997
____________________________________
           Jerry C. Atkin


          /s/ R.D. Cash              Director                         October 1, 1997
____________________________________
             R.D. Cash
</TABLE>
 
                                     II-4
<PAGE>
 
<TABLE>
<CAPTION>
             SIGNATURE                           TITLE                   DATE
             ---------                           -----                   ----
<S>                                  <C>                           <C>
         /s/ L.E. Simmons            Director                       October 1, 1997
____________________________________
            L.E. Simmons

      /s/ Grant R. Caldwell          Director                       October 1, 1997
____________________________________
         Grant R. Caldwell

          /s/ I.J. Wagner            Director                       October 1, 1997
____________________________________
            I.J. Wagner

                                     Director
____________________________________
          Roger B. Porter

                                     Director
____________________________________
         Dale W. Westergard

      /s/ Richard H. Madsen          Director                       October 1, 1997
____________________________________
         Richard H. Madsen

       /s/ Robert G. Sarver          Director                       October 1, 1997
____________________________________
          Robert G. Sarver
</TABLE>
 
 
                                      II-5
<PAGE>
 
                                 EXHIBIT INDEX
 
                    (PURSUANT TO ITEM 601 OF REGULATION S-K)
 
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                      DESCRIPTION AND METHOD OF FILING
 -------                    --------------------------------
 <C>     <S>
  2.1    Agreement and Plan of Merger, dated as of September 1997, between
         Zions Bancorporation and Vectra Banking Corporation (included as
         Appendix A to the Proxy Statement-Prospectus and incorporated by
         reference herein)
  3.1    Restated Articles of Incorporation of Zions Bancorporation dated
         November 8, 1993, and filed with the Department of Business
         Regulation, Division of Corporations of the State of Utah on November
         9, 1993 (incorporated by reference to Exhibit 3.1 to the Registrant's
         Form S-4 Registration Statement, File No. 33-51145, filed on November
         22, 1993)
  3.2    Restated Bylaws of Zions Bancorporation, dated November 8, 1993
         (incorporated by reference to Exhibit 3.2 to the Registrant's Form S-4
         Registration Statement, File No. 33-51145, filed November 22, 1993)
  3.3    Articles of Amendment to the Restated Articles of Incorporation of
         Zions Bancorporation dated April 30, 1997 and filed with the
         Department of Business Regulation, Division of Corporations of the
         State of Utah on May 2, 1997 (incorporated by reference to Exhibit 3.1
         of Zions Bancorporation's Quarterly Report on Form 10-Q for the
         quarter ended June 30, 1997, File No. 0-2610)
  4.1    Shareholder Protection Rights Agreement, dated as of September 27,
         1996, between Zions Bancorporation and Zions First National Bank
         (incorporated by reference to Exhibit 4 to the Registrant's Form 8-K,
         filed October 12, 1996)
  5.1    Opinion of Sullivan & Cromwell regarding the validity of the shares of
         Common Stock being registered (filed herewith)
  5.2    Opinion of Callister Nebeker & McCullough, a Professional Corporation,
         regarding the validity of the shares of Common Stock being registered
         (filed herewith)
  8.1    Opinion of Sullivan & Cromwell regarding tax matters (filed herewith)
  8.2    Opinion of Lewis, Rice & Fingersh, L.C. regarding tax matters (filed
         herewith)
 23.1    Consent of KPMG Peat Marwick LLP, independent certified public
         accountants for Zions Bancorporation (filed herewith)
 23.2    Consent of KPMG Peat Marwick LLP, independent certified public
         accountants for Vectra Banking Corporation (filed herewith)
 23.3    Consent of Sullivan & Cromwell (contained in their opinions filed as
         Exhibits 5.1 and 8.1)
 23.4    Consent of Lewis, Rice & Fingersh, L.C. (contained in their opinion
         filed as Exhibit 8.2)
 23.5    Consent of Callister Nebeker & McCullough, a Professional Corporation
         (contained in their opinion filed as Exhibit 5.2)
 23.6    Consent of The Wallach Company, Inc.
 24.1    Power of Attorney (set forth on Page II-4 of the Registration
         Statement)
 99.1    Stock Option Agreement, dated as of September 23, 1997, between Zions
         Bancorporation and Vectra Banking Corporation (included as Appendix B
         to the Proxy Statement-Prospectus and incorporated by reference
         herein)
 99.2    Form of Proxies for common stock and for preferred stock of Vectra
         Bancorporation (filed herewith)
</TABLE>
 
                                      II-6

<PAGE>
 
                                                                     EXHIBIT 5.1

                      [LETTERHEAD OF SULLIVAN & CROMWELL]

                                                               November 18, 1997


Zions Bancorporation,
One South Main, Suite 1380,
Salt Lake City, Utah 84111.


Dear Sirs:

     In connection with the registration under the Securities Act of 1933 (the
"Act") of 4,419,995 shares (the "Securities") of Common Stock, without par
value, of Zions Bancorporation, a Utah corporation (the "Company"), we, as your
counsel, have examined such corporate records, certificates and other documents,
and such questions of law, as we have considered necessary or appropriate for
the purposes of this opinion.  Upon the basis of such examination, we advise you
that, in our opinion when the registration statement relating to the Securities
(the "Registration Statement") has become effective under the Act, the terms of
the sale of the Securities have been duly established in conformity with the
Company's articles of 

<PAGE>
 
Zions Bancorporation                                                        -2-


incorporation, and the Securities have been duly issued and sold as contemplated
by the Registration Statement and the merger of Vectra Banking Caorporation with
and into the Company has been consummated, the Securities will be validly
issued, fully paid and nonassessable.

     The foregoing opinion is limited to the Federal laws of the United States
and the laws of the State of Utah, and we are expressing no opinion as to the
effect of the laws of any other jurisdiction. With respect to all matters of
Utah law, we have relied upon the opinion, dated November 18, 1997, of Callister
Nebeker & McCullough, a Professional Corporation, and our opinion is subject to
the same assumptions, qualifications and limitations with respect to such
matters as are contained in such opinion of Callister Nebeker & McCullough, a
Professional Corporation.

     Also, we have relied as to certain matters on information obtained from
public officials, officers of the Company and other sources believed by us to be
responsible.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to us under the heading "Validity of
Securities" 

<PAGE>
 
Zions Bancorporation                                                        -3-


in the Prospectus. In giving such consent, we do not thereby admit that we are
in the category of persons whose consent is required under Section 7 of the Act.

                                       Very truly yours,

                                    /s/ SULLIVAN & CROMWELL

                                        SULLIVAN & CROMWELL      


<PAGE>
 
                                                                     EXHIBIT 5.2

                [LETTERHEAD OF CALLISTER NEBEKER & MCCULLOUGH]


                               18 November 1997


VIA HAND DELIVERY
- ------------------
Zions Bancorporation
One South Main, Suite 1380
Salt Lake City, Utah 84111


Ladies and Gentlemen:

     We have acted as special Utah counsel to Zions Bancorporation, a Utah 
corporation (the "Company"), in providing this opinion with respect to the 
registration under the Securities Act of 1933 (the "Act") of 4,419,995 shares 
(the "Shares") of the Company's Common Stock, no par value.  This opinion is 
being delivered to you pursuant to your request.

     In connection with this representation, we have examined the original, or 
copies identified to our satisfaction, of such minutes, agreements, corporate 
records and filings and other documents necessary to or appropriate for our 
opinion contained in this letter (the "Transaction Documents").  We have also 
relied as to certain matters of fact upon representations made to us by public 
officials, officers and agents of the Company, and other sources we believe to 
be responsible.

     Based upon and in reliance on the foregoing, it is our opinion that the 
Shares will be, when issued in accordance with the Transaction Documents 
including the registration statement relating to the Shares (the "Registration 
Statement"), duly and validly issued and fully paid and nonassessable under the 
Utah Revised Business Corporation Act, and the shareholders of the Company have 
no pre-emptive right to acquire additional shares in respect of the Shares.

     Although we have reviewed the Transaction Documents, and have made such 
inquiries as we deem appropriate under the circumstances, we have not verified 
independently the existence or absence of all of the facts set forth in each 
such Transaction Document.

     Our opinion, as set forth herein, is subject to the following further 
qualifications:

      A.   This opinion speaks only as of its date and you understand that this 
firm has no obligation to advise you of any changes of law or fact that occur 
after the date of this opinion, even if the change may affect the legal 
analysis, a legal conclusion or any informational confirmation in this opinion.
<PAGE>
 
Zions Bancorporation
18 November 1997
Page 2
- --------------------


     B. Members of our firm are admitted to the Bar in the State of Utah.  This 
opinion is limited to the laws of the State of Utah (excluding the securities 
laws of the State of Utah), and we have not been asked to address nor have we 
addressed or expressed an opinion on the laws of any other jurisdiction, 
including federal laws and rules and regulations relating thereto.  Our opinion 
is rendered only with respect to Utah laws and the rules, regulations, and 
orders thereunder that are currently in effect.

     We consent to Sullivan & Cromwell's relying as to matters of Utah law upon 
this opinion in connection with the opinion to be rendered by them pursuant to 
the Registration Statement.  We also hereby consent to the filing of this 
opinion as an exhibit to the Registration Statement.  In giving such consent, we
do not thereby admit that we are in the category of persons whose consent is 
required under Section 7 of the Act.

     This opinion is furnished to you solely for your benefit in connection with
the closing of the transactions contemplated by the Registration Statement, may
not be relied upon by any other person, and is not to be used, circulated, 
quoted or otherwise referred to for any other purpose without our express prior 
written permission.

                                  Very truly yours,


                              /s/ CALLISTER NEBEKER, & McCULLOUGH

                                  CALLISTER NEBEKER, & McCULLOUGH

                                  A Professional Corporation



cc:  Dale M. Gibbons
     Stanley F. Farrar, Esq. (via Federal Express)
     Patrick S. Brown, Esq. (via Federal Express)
     Louis H. Callister, Esq.

<PAGE>
 


                                                                     EXHIBIT 8.1



                       [SULLIVAN & CROMWELL LETTERHEAD]



                                                             November 18, 1997



Zions Bancorporation,
   One South Main,
      Suite 1380,
         Salt Lake City, Utah 84111.

Dear Sirs:

         We have acted as special U.S. tax counsel to Zions Bancorporation
("Zions") in connection with the Registration Statement on Form S-4 of Zions
filed with the Securities and Exchange Commission on November 18, 1997 (the
"Registration Statement") and hereby confirm to you our opinion as set forth
under the heading "Certain Federal Income Tax Consequences" in the Prospectus
included in the Registration Statement.

         We hereby consent to the filing with the Securities and Exchange
Commission of this letter as an exhibit to the Registration Statement and the
reference to us under the heading "Certain Federal Income Tax Consequences". In
giving such consent, we do not thereby admit that we are within the category of
persons whose consent is required under Section 7 of the Securities Act of 1933.


                                                Very truly yours, 




























 

<PAGE>
 
                                                                     EXHIBIT 8.2

                 [LETTERHEAD OF LEWIS, RICE & FINGERSH, P.C.]

                               November 18, 1997


Board of Directors
Vectra Banking Corporation
1650 S. Colorado Boulevard
Denver, Colorado 80222

     Re:  Merger of Vectra Banking Corporation into Zions Bancorporation

Gentlemen:

     You have requested our opinion as to the federal income tax consequences of
the proposed merger (the "Merger") of Vectra Banking Corporation ("Vectra") into
Zions Bancorporation ("Zions") pursuant to the Agreement and Plan of Merger 
dated September 23, 1997 by and among Vectra and Zions (the "Merger Agreement").
In issuing this opinion letter, we have relied upon (1) the factual 
representations made by Vectra in a written statement dated October 22, 1997, 
Zions in a written statement dated October 22, 1997 and certain Vectra 
shareholders in written statements, respectively (the "Representations"), (2) 
the Merger Agreement, (3) the facts, information and documentation set forth in 
the Registration Statement on Form S-4 of Zions filed with the Securities and 
Exchange Commission in connection with the Merger (the "Registration 
Statement").

     Based on our review of the Merger Agreement, the Representations, and the 
Registration Statement, and assuming the transactions described therein are 
completed as described, our
<PAGE>
 
opinion as to the federal income tax consequences of the Merger is as follows:

     
     1.  Provided that the Merger qualifies as a statutory merger under 
applicable Colorado and Utah law, the Merger will constitute a reorganization 
within the meaning of section 368 of the Internal Revenue Code of 1986, as 
amended (the "Code").

     2.  Pursuant to section 354(a)(1) of the Code, no gain or loss will be 
recognized by Vectra shareholders who exchange all of their Vectra stock for 
shares of Zions common stock, except with respect to cash received in lieu of 
fractional share interests and, in the case of Vectra preferred shareholders, 
with respect to cash received upon the exercise of Dissenters' Rights.

     This opinion letter is predicated upon our understanding of the facts set 
forth in the Merger Agreement, the Representations and the Registration 
Statement.  Any change in such facts may adversely affect our opinion. 
Furthermore, our opinion is based upon our understanding of the existing 
provisions of the Code, currently applicable regulations promulgated under the 
Code, current published administrative positions of the Internal Revenue 
Service, such as revenue rulings and revenue procedures, and existing judicial 
decisions, all of which are subject to change either prospectively or 
retroactively. Any change in such authorities may adversely affect our opinion. 
We assume no

                                       2
<PAGE>
 
obligation to update our opinion for any deletions or additions to or 
modifications of any law applicable to the Merger.  In addition, we express no 
opinion as to any state or local tax consequences with respect to the Merger.  
Each shareholder of Vectra should consult with a qualified tax advisor for 
assurance as to the particular tax consequences of the Merger to that 
shareholder, any reporting requirements which may be applicable, or any other 
tax considerations more expressly mentioned herein.

     We consent to the use of this opinion as an exhibit to the Registration 
Statement.

                                  Very truly yours,


                               /s/Lewis, Rice & Fingersh, L.C.
                                  
                                  Lewis, Rice & Fingersh, L.C.


<PAGE>
 
                                                                   EXHIBIT 23.1
 
              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
The Board of Directors
Zions Bancorporation:
 
  We consent to the use of our report dated January 16, 1997, with respect to
the consolidated financial statements of Zions Bancorporation as of December
31, 1996 and 1995, and for each of the years in the three-year period ended
December 31, 1996 incorporated herein by reference, and to the reference to
our firm under the heading "Experts" in the prospectus.
 
                                          /s/ KPMG Peat Marwick LLP
                                          KPMG Peat Marwick LLP
 
November 18, 1997
Salt Lake City, Utah

<PAGE>
 
                                                                   EXHIBIT 23.2
 
              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
The Board of Directors
Vectra Banking Corporation:
 
  We consent to the use of our report dated January 31, 1997 on the
consolidated financial statements of Vectra Banking Corporation as of December
31, 1996 and 1995, and for each of the years in the three-year period ended
December 31, 1996 incorporated herein by reference, and to the reference to
our firm under the heading "Experts" in the prospectus.
 
                                          /s/ KPMG Peat Marwick LLP
                                          KPMG Peat Marwick LLP
 
November 18, 1997
Denver, Colorado

<PAGE>
 
                                                                   EXHIBIT 23.6
 
                   [LETTERHEAD OF THE WALLACH COMPANY, INC.]
 
PERSONAL AND CONFIDENTIAL
 
November 18, 1997
 
Board of Directors
Vectra Banking Corporation
1650 South Colorado Boulevard,
Suite 320
Denver, Colorado 80222
 
Re: Proxy Statement-Prospectus of Vectra Banking Corporation
 
Gentlemen:
 
  Reference is made to our opinion letter dated the date of the above-
mentioned Proxy Statement-Prospectus with respect to the fairness to the
holders of the outstanding shares of stock of Vectra Banking Corporation (the
"Company") of the Merger Consideration (as defined in the opinion letter) in
the proposed merger (the "Merger") of the Company with Zions Bancorporation
("Zions") pursuant to the Agreement and Plan of Merger dated as of September
23, 1997 by and between the Company and Zions.
 
  We hereby consent to the inclusion of such opinion in the above-mentioned
Proxy Statement-Prospectus and to the reference to the opinions of our firm
dated September 19, 1997 and dated the date of the above-mentioned Proxy
Statement-Prospectus under the captions "Summary--The Merger--OPINION OF
FINANCIAL ADVISOR", "The Merger--Background of the Merger", "The Merger--
Reasons for the Merger; Recommendation of the Board of Directors--Vectra" and
"The Merger--Opinion of Financial Advisor" in the above-mentioned Proxy
Statement-Prospectus. In providing such consent, except as may be required by
the federal securities laws, we do not admit that we are in the category of
persons whose consent is required under Section 7 of the Securities Act of
1933, as amended.
 
                                          Very truly yours,
 
 
                                          The Wallach Company, Inc.

<PAGE>
 
 
PROXY                                                               COMMON STOCK
 
                           VECTRA BANKING CORPORATION
                    1650 South Colorado Boulevard, Suite 320
                             Denver, Colorado 80222
 
  THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF VECTRA BANKING
CORPORATION FOR THE SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON DECEMBER 29,
1997.
 
  The undersigned hereby constitutes and appoints Gary S. Judd and Ray L. Nash
or either of them, with full power of substitution, attorneys and proxies of
the undersigned, to represent the undersigned and vote all shares of the common
stock of Vectra Banking Corporation ("Vectra") which the undersigned would be
entitled to vote if personally present at Vectra's Special Meeting of
Shareholders to be held in the lobby of the headquarters of Vectra, 1650 South
Colorado Boulevard, Denver, Colorado, on December 29, 1997 at 8:00 a.m., local
time, and at any postponement or adjournment thereof, in the following manner:
 
  1. APPROVAL OF THE MERGER
                   [_] FOR      [_] AGAINST      [_] ABSTAIN
 
  Other Matters. The proxies are authorized to vote upon such other business as
may properly come before the Special Meeting, or at any postponement or
adjournment thereof.
 
 THE BOARD OF DIRECTORS OF VECTRA RECOMMENDS THAT YOU VOTE FOR APPROVAL OF ITEM
                                       1.
 
                          (continued on reverse side)
 
 
 
  WHEN THIS PROXY IS PROPERLY EXECUTED AND RETURNED, THE SHARES IT REPRESENTS
WILL BE VOTED AT THE MEETING IN ACCORDANCE WITH THE CHOICES SPECIFIED ABOVE. IF
NO CHOICES ARE SPECIFIED, THIS PROXY WILL BE VOTED FOR PROPOSAL ONE. THE PROXY
WILL BE VOTED IN ACCORDANCE WITH THE BEST JUDGMENT OF THE DESIGNATED
INDIVIDUALS WITH RESPECT TO MATTERS INCIDENT TO THE CONDUCT OF THE MEETING AND
ANY OTHER MATTERS WHICH MAY PROPERLY COME BEFORE THE MEETING OR ANY
POSTPONEMENT OR ADJOURNMENT THEREOF.
 
  Please date and sign exactly as your name or names appear hereon. If more
than one owner exists, all should sign. When signing as attorney, executor,
administrator, trustee or guardian, give your full title as such. If the
signatory is a corporation or partnership, sign the full corporate or
partnership name by a duly authorized officer or partner.
 
                                       Dated: ___________________, 1997


                                       --------------------------------
                                                  Signature

                                       --------------------------------

                                                  Signature


                                       --------------------------------
                                                Type or Print
 
   PLEASE PROMPTLY COMPLETE, DATE, SIGN AND RETURN THIS PROXY CARD USING THE
                               ENCLOSED ENVELOPE
 
<PAGE>
 
 

                                       
 
PROXY                                                            PREFERRED STOCK
 
                           VECTRA BANKING CORPORATION
                    1650 South Colorado Boulevard, Suite 320
                             Denver, Colorado 80222
 
  THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF VECTRA BANKING
CORPORATION FOR THE SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON DECEMBER 29,
1997.
 
  The undersigned hereby constitutes and appoints Gary S. Judd and Ray L. Nash
or either of them, with full power of substitution, attorneys and proxies of
the undersigned, to represent the undersigned and vote all shares of the
preferred stock of Vectra Banking Corporation ("Vectra") which the undersigned
would be entitled to vote if personally present at Vectra's Special Meeting of
Shareholders to be held in the lobby of the headquarters of Vectra, 1650 South
Colorado Boulevard, Denver, Colorado, on December 29, 1997 at 8:00 a.m., local
time, and at any postponement or adjournment thereof, in the following manner:
 
  1. APPROVAL OF THE MERGER:
 
                  [_] FOR        [_] AGAINST        [_] ABSTAIN
 
  Other Matters. The proxies are authorized to vote upon such other business as
may properly come before the Special Meeting, or at any postponement or
adjournment thereof.
 
 THE BOARD OF DIRECTORS OF VECTRA RECOMMENDS THAT YOU VOTE FOR APPROVAL OF ITEM
                                       1.
 
                          (continued on reverse side)
 
 
 
  WHEN THIS PROXY IS PROPERLY EXECUTED AND RETURNED, THE SHARES IT REPRESENTS
WILL BE VOTED AT THE MEETING IN ACCORDANCE WITH THE CHOICES SPECIFIED ABOVE. IF
NO CHOICES ARE SPECIFIED, THIS PROXY WILL BE VOTED FOR PROPOSAL ONE. THE PROXY
WILL BE VOTED IN ACCORDANCE WITH THE BEST JUDGMENT OF THE DESIGNATED
INDIVIDUALS WITH RESPECT TO MATTERS INCIDENT TO THE CONDUCT OF THE MEETING AND
ANY OTHER MATTERS WHICH MAY PROPERLY COME BEFORE THE MEETING OR ANY
POSTPONEMENT OR ADJOURNMENT THEREOF.
 
  Please date and sign exactly as your name or names appear hereon. If more
than one owner exists, all should sign. When signing as attorney, executor,
administrator, trustee or guardian, give your full title as such. If the
signatory is a corporation or partnership, sign the full corporate or
partnership name by a duly authorized officer or partner.
 
                                       Dated: ___________________, 1997


                                       --------------------------------
                                                  Signature

                                       --------------------------------
                                                  Signature

                                       --------------------------------
                                                Type or Print
 
   PLEASE PROMPTLY COMPLETE, DATE, SIGN AND RETURN THIS PROXY CARD USING THE
                               ENCLOSED ENVELOPE
 


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