BANCFIRST CORP /OK/
10-Q, 1998-05-15
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                   FORM 10-Q



(Mark One)


[X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR
      15(d) OF THE SECURITIES EXCHANGE ACT OF 1934



FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1998



                                       OR


[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR
      15(d) OF THE SECURITIES EXCHANGE ACT OF 1934


FOR THE TRANSITION PERIOD
FROM_________________________to________________________



COMMISSION FILE NUMBER 0-14384


                             BANCFIRST CORPORATION
              (Exact name of registrant as specified in charter)


                  Oklahoma                                 73-1221379
       (State or other Jurisdiction of                   (I.R.S. Employer
       incorporation or organization)                   Identification No.)


              101 N. Broadway, Suite 200, Oklahoma City, Oklahoma
                                  73102-8401
                   (Address of principal executive offices)
                                  (Zip Code)



                                (405) 270-1086
             (Registrant's telephone number, including area code)


                 ---------------------------------------------
                (Former name, former address and former fiscal
                      year, if changed since last report)


  Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes  X  No 
                                               ---    ---


  As of April 30, 1998 there were 6,363,179 shares of the registrant's Common
Stock outstanding.

                                       1
<PAGE>
                        PART I - FINANCIAL INFORMATION
 
                             BANCFIRST CORPORATION
                          CONSOLIDATED BALANCE SHEET
                            (DOLLARS IN THOUSANDS)
<TABLE> 
<CAPTION> 
                                                                            MARCH 31,                DECEMBER 31,
                                                                ---------------------------------                              
                                                                      1998             1997              1997
                                                                ----------------  ---------------   ---------------
<S>                                                             <C>               <C>               <C> 
 ASSETS
 Cash and due from banks                                            $   102,916      $    67,421       $    69,652
 Interest-bearing deposits with banks                                       100               62               147
 Securities (market value: $397,675, $302,985
  and $311,013, respectively)                                           396,911          302,760           310,343
 Federal funds sold                                                      29,000           32,670            40,600
 Loans:
   Total loans (net of unearned interest)                               926,769          783,296           857,896
   Allowance for possible loan losses                                   (12,699)         (11,925)          (12,284)
                                                                    -----------      -----------       -----------  
     Loans, net                                                         914,070          771,371           845,612
 Premises and equipment, net                                             35,719           33,556            33,598
 Other real estate owned                                                    684            1,239               915
 Intangible assets, net                                                  22,364           13,889            12,500
 Accrued interest receivable                                             14,000           11,043            11,357
 Other assets                                                            17,091           17,903            21,065 
                                                                    -----------      -----------       -----------  
     Total assets                                                   $ 1,532,855      $ 1,251,914       $ 1,345,789 
                                                                    ===========      ===========       ===========  

 LIABILITIES AND STOCKHOLDERS' EQUITY
 Deposits:
   Noninterest-bearing                                              $   287,597      $   235,844       $   269,089
   Interest-bearing                                                   1,070,056          860,442           906,021 
                                                                    -----------      -----------       -----------  
     Total deposits                                                   1,357,653        1,096,286         1,175,110
 Short-term borrowings                                                    5,061            1,291             6,016
 Long-term borrowings                                                     7,024            6,587             7,051
 9.65% Capital Securities                                                25,000           25,000            25,000
 Accrued interest payable                                                 6,159            4,734             5,722
 Other liabilities                                                        5,465            5,056             3,956 
                                                                    -----------      -----------       -----------  
     Total liabilities                                                1,406,364        1,138,954         1,222,855 
                                                                    -----------      -----------       -----------  
 Commitments and contingent liabilities
 Stockholders' equity:
   Common stock                                                           6,363            6,339             6,345
   Capital surplus                                                       36,157           35,083            36,008
   Retained earnings                                                     82,238           71,862            79,032
   Accumulated other comprehensive income                                 1,733             (324)            1,549 
                                                                    -----------      -----------       -----------  
     Total stockholders' equity                                         126,491          112,960           122,934 
                                                                    -----------      -----------       -----------  
     Total liabilities and stockholders' equity                     $ 1,532,855      $ 1,251,914       $ 1,345,789 
                                                                    ===========      ===========       ===========  
</TABLE> 

 See accompanying notes to consolidated financial statements.

                                       2
<PAGE>
 
                             BANCFIRST CORPORATION
                       CONSOLIDATED STATEMENT OF INCOME
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<TABLE> 
<CAPTION> 
                                               THREE MONTHS ENDED
                                                    MARCH 31,
                                              --------------------
                                                1998        1997
                                              --------    --------
<S>                                           <C>         <C> 
INTEREST INCOME
Loans, including fees                         $ 20,897    $ 18,164
Interest-bearing deposits with banks                 2          19
Securities:
  Taxable                                        4,795       4,513
  Tax-exempt                                       283         153
Federal funds sold                                 497         350
                                              --------    --------
    Total interest income                       26,474      23,199
                                              --------    --------
INTEREST EXPENSE
Deposits                                        10,200       8,847
Short-term borrowings                              153          21
Long-term borrowings                               107          96
9.65% Capital Securities                           614         373
                                              --------    --------
    Total interest expense                      11,074       9,337
                                              --------    --------
Net interest income                             15,400      13,862
Provision for possible loan losses                 577          96
                                              --------    --------
    Net interest income after provision for
      possible loan losses                      14,823      13,766
                                              --------    --------
NONINTEREST INCOME
Service charges on deposits                      2,597       2,481
Securities transactions                              -           -
Other                                            1,779       1,326
                                              --------    --------
    Total noninterest income                     4,376       3,807
                                              --------    --------
NONINTEREST EXPENSE
Salaries and employee benefits                   7,587       6,550
Occupancy and fixed assets expense, net            765         763
Depreciation                                       819         709
Amortization                                       552         533
Data processing services                           380         370
Net expense from other real estate owned            23          62
Other                                            2,747       2,527
                                              --------    --------
    Total noninterest expense                   12,871      11,514
                                              --------    --------
Income before taxes                              6,328       6,059
Income tax expense                              (2,358)     (2,298)
                                              --------    --------
    Net income                                   3,970       3,761
Other comprehensive income, net of tax:
  Unrealized gains on securities                   184      (1,060)
                                              --------    --------
     Comprehensive income                     $  4,154    $  2,701
                                              ========    ========
NET INCOME PER COMMON SHARE
Basic                                         $   0.62    $   0.59
                                              ========    ========
Diluted                                       $   0.60    $   0.57
                                              ========    ========
</TABLE> 
See accompanying notes to consolidated financial statements.

                                       3
<PAGE>
 
                             BANCFIRST CORPORATION
                     CONSOLIDATED STATEMENT OF CASH FLOWS
                            (DOLLARS IN THOUSANDS)
<TABLE> 
<CAPTION> 
                                                                          THREE MONTHS ENDED
                                                                               MARCH 31,
                                                                        ----------------------
                                                                           1998         1997
                                                                        ---------    ---------
<S>                                                                     <C>          <C> 
CASH FLOWS FROM OPERATING ACTIVITIES                                    $   3,791    $  11,872
                                                                        ---------    ---------
INVESTING ACTIVITIES
Cash and due from banks used for acquisitions                              93,486       (4,954)
Purchases of securities:
  Held for investment                                                     (95,254)        (157)
  Available for sale                                                       (2,391)     (37,305)
Maturities of securities:
  Held for investment                                                         767        1,054
  Available for sale                                                       10,520       16,000
Proceeds from sales of securities:
  Held for investment                                                         187          105
  Available for sale                                                            -            -
Net decrease in federal funds sold                                         11,600       12,115
Purchases of loans                                                         (3,934)      (2,023)
Proceeds from sales of loans                                               21,667       23,843
Net other increase in loans                                               (56,245)     (41,810)
Purchases of premises and equipment                                        (1,201)      (1,624)
Proceeds from sales of other real estate owned and repossessed assets         492          307
Other, net                                                                     83        1,279
                                                                        ---------    ---------
    Net cash used for investing activities                                (20,223)     (33,170)
                                                                        ---------    ---------
FINANCING ACTIVITIES
Net increase (decrease) in demand, transaction and savings deposits        21,903      (27,356)
Net increase in certificates of deposit                                    29,322       18,189
Net decrease in short-term borrowings                                        (955)      (2,123)
Net decrease in long-term borrowings                                          (26)         (49)
Issuance of 9.65% Capital Securities                                            -       25,000
Issuance of common stock                                                      166           98
Purchase and retirement of common stock                                         -       (1,277)
Cash dividends paid                                                          (761)        (640)
                                                                        ---------    ---------
    Net cash provided by financing activities                              49,649       11,842
                                                                        ---------    ---------
Net increase (decrease) in cash and due from banks                         33,217       (9,456)
Cash and due from banks at the beginning of the period                     69,799       76,939
                                                                        ---------    ---------
Cash and due from banks at the end of the period                        $ 103,016    $  67,483
                                                                        ---------    ---------

SUPPLEMENTAL DISCLOSURE
Cash paid during the period for interest                                $  10,636    $   8,543
                                                                        =========    =========
Cash paid during the period for income taxes                            $      23    $    --   
                                                                        =========    =========
</TABLE> 
See accompanying notes to consolidated financial statements.

                                       4
<PAGE>
 
                             BANCFIRST CORPORATION
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                 (Dollars in thousands, except per share data)


(1)  GENERAL

     The accompanying consolidated financial statements include the accounts of
BancFirst Corporation, BFC Capital Trust I, BancFirst, BancFirst Investment
Corporation, Lenders Collection Corporation and Express Financial Corporation
(formerly National Express Corporation).  All significant intercompany accounts
and transactions have been eliminated.  Assets held in a fiduciary or agency
capacity are not assets of the Company and, accordingly, are not included in the
consolidated financial statements.

     The unaudited interim financial statements contained herein reflect all
adjustments which are, in the opinion of management, necessary to provide a fair
statement of the financial position and results of operations of the Company for
the interim periods presented.  All such adjustments are of a normal and
recurring nature.  There have been no significant changes in the accounting
policies of the Company since December 31, 1997, the date of the most recent
annual report.  Certain amounts in the 1997 financial statements have been
reclassified to conform to the 1998 presentation.


     The preparation of financial statements in conformity with generally
accepted accounting principles inherently involves the use of estimates and
assumptions that affect the amounts reported in the financial statements and the
related disclosures. Such estimates and assumptions may change over time and
actual amounts may differ from those reported.

(2)  MERGERS, ACQUISITIONS AND DISPOSALS

     In December 1996, the Company's money order subsidiary, Express Financial
Corporation (formerly National Express Corporation) entered into an agreement
for the sale of its business.  Under the terms of the agreement, Express
Financial Corporation received cash of $600 in January 1997, and may receive
additional payments of up to $500 over a two-year period based upon specified
levels of business retained by the purchaser.  The business and intangible
assets of Express Financial Corporation were transferred to the purchaser in
January and February 1997.  The purchaser did not assume any liabilities of
Express Financial Corporation.  The sale was accounted for as a disposal of a
segment of business.  Consequently, the expected net gain from the disposal will
be recognized in the Company's consolidated statement of income when the final
proceeds are received.  The operations of Express Financial Corporation were not
material in relation to the consolidated operations of the Company.  In March
1998, the first additional payment from the sale of $243 was received.  The
final payment is due in January 1999.  The following assets and liabilities of
Express Financial Corporation are included in the Company's consolidated balance
sheet:
<TABLE> 
<CAPTION> 
  
                                                                                   MARCH 31,                    
                                                                         ---------------------------   DECEMBER 31,
                                                                             1998           1997           1997
                                                                         ------------   ------------   ------------
<S>                                                                      <C>            <C>            <C> 
        Cash and due from BancFirst                                      $      1,077   $      2,281   $      2,290
        Interest-bearing deposit with BancFirst                                 3,684          3,674          3,674
        Securities held for investment                                          2,261            786            508
        Premises and equipment, net                                                 5            167              6
        Intangible assets, net                                                     --             --             --
        Receivables from money order sales, net                                    --            261            283
        Other assets                                                                3             11              9
                                                                         ------------   ------------   ------------
            Total assets                                                 $      7,030   $      7,180   $      6,770
                                                                         ============   ============   ============
        
        Outstanding money orders                                         $      1,669   $      2,008   $      1,693
        Other liabilities                                                          --              5             16
                                                                         ------------   ------------   ------------
            Total liabilities                                            $      1,669   $      2,013   $      1,709
                                                                         ------------   ------------   ------------
</TABLE> 

                                       5
<PAGE>
 
     In March 1998, BancFirst completed the purchase 13 branches from
NationsBank, N.A and concurrently sold three of the branches to another Oklahoma
financial institution. The purchase and sale resulted in BancFirst purchasing
loans and other assets of approximately $32,800, assuming deposits of
approximately $132,100 and paying a premium on deposits of approximately $9,100.
The transaction was accounted for as a purchase. Accordingly, the effects of the
purchase are included in the Company's consolidated financial statements from
the date of the purchase forward. In April 1998, BancFirst entered into
agreements to sell four additional branches to other Oklahoma financial
institutions on substantially the same terms as BancFirst's purchase of the
branches from NationsBank, N.A. These branches have loans and other assets of
approximately $11,000 and deposits of approximately $59,100. The sales of these
branches are expected to be completed in June and July of 1998.

     In May 1998, the Company completed a merger with Lawton Security
Bancshares, Inc. ("Lawton Security Bancshares"), which had approximately $92,000
in total assets. The merger was effected through the exchange of 414,790 shares
of BancFirst Corporation common stock for all of the Lawton Security Bancshares
common stock outstanding, and will be accounted for as a pooling of interests.
Accordingly, for periods reported subsequent to the completion of the merger,
the consolidated accounts of Lawton Security Bancshares will be combined with
the accounts of the Company and will be included in the Company's consolidated
financial statements for all periods presented.

     In May 1998, the Company entered into a merger agreement with AmQuest
Financial Corp. ("AmQuest") of Duncan, Oklahoma.  The merger is expected to be
completed in September 1998 and would be effected through the exchange of a
maximum of 2,625,000 shares of BancFirst Corporation common stock for all of the
AmQuest common stock outstanding, with AmQuest being merged into the Company.
AmQuest has approximately $568,000 in total assets and operates two subsidiary
banks, AmQuest Bank, N.A. and Exchange National Bank & Trust Company.  The
merger is subject to shareholder and regulatory approvals and will be accounted
for as a pooling of interests.   Accordingly, for periods reported subsequent to
the completion of the merger, the consolidated accounts of AmQuest will be
combined with the accounts of the Company and will be included in the Company's
consolidated financial statements for all periods presented.

(3)  SECURITIES

     The table below summarizes securities held for investment and securities
available for sale.
<TABLE> 
<CAPTION> 

                                                                                   MARCH 31,                    
                                                                         ---------------------------   DECEMBER 31,
                                                                             1998           1997           1997
                                                                         ------------   ------------   ------------
<S>                                                                      <C>            <C>            <C> 
        Held for investment, at cost (market value:
          $40,273, $32,527 and $38,705, respectively)                    $     39,509   $     32,302   $     38,035
        Available for sale, at market value                                   357,402        270,458        272,308
                                                                         ------------   ------------   ------------
            Total securities                                             $    396,911   $    302,760   $    310,343
                                                                         ============   ============   ============
</TABLE> 

(4)  COMPREHENSIVE INCOME

     The Company adopted Statement of Financial Accounting Standards No. 130,
"Reporting Comprehensive Income" effective January 1, 1998.  This Statement
establishes standards for reporting and display of comprehensive income and its
components (revenues, expenses, gains and losses) in a full set of general-
purpose financial statements.  The only component of comprehensive income
reported by the Company is the unrealized gain or loss on securities available
for sale.  The amount of this unrealized gain or loss, net of tax, has been
presented in the statement of income for each period as a component of other
comprehensive income.  Below is a summary of the tax effects of this unrealized
gain or loss.

                                       6
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                        THREE MONTHS ENDED
                                                                             MARCH 31,
                                                                    ---------------------------
                                                                        1998           1997
                                                                    ------------   ------------
<S>                                                                 <C>            <C> 
     Unrealized gain (loss) during the period:
     Before-tax amount                                              $       254    $     (1,581)
     Tax expense                                                            (70)            521 
                                                                    ------------   ------------
     Net-of-tax amount                                              $       184    $     (1,060)
                                                                    ============   ============
</TABLE> 

     The amount of unrealized gain or loss included in accumulated other
comprehensive income is summarized below.

<TABLE> 
<CAPTION> 
                                                                        THREE MONTHS ENDED
                                                                             MARCH 31,
                                                                    ---------------------------
                                                                        1998           1997
                                                                    ------------   ------------
<S>                                                                 <C>            <C> 
     Unrealized gain (loss) on securities:   
     Beginning balance                                              $      1,549   $        736
     Current period change                                                   184         (1,060)
                                                                    ------------   ------------
     Ending balance                                                 $      1,733   $       (324)
                                                                    ============   ============
</TABLE> 


(5)  NET INCOME PER COMMON SHARE

     Basic and diluted net income per common share are calculated as follows:
<TABLE> 
<CAPTION> 

                                                                  INCOME            SHARES           PER SHARE
                                                                (NUMERATOR)      (DENOMINATOR)         AMOUNT
                                                              --------------   -----------------    ------------
<S>                                                           <C>              <C>                  <C> 
     THREE MONTHS ENDED MARCH 31, 1998 
     ---------------------------------
     BASIC:
     Income available to common stockholders                  $        3,970           6,355,273    $       0.62
                                                                                                    ============
     Effect of stock options                                              --             216,809
                                                              --------------   -----------------    

     DILUTED:
     Income available to common stockholders
      plus assumed exercises of stock options                 $        3,970           6,572,082    $       0.60
                                                              ==============   =================    ============   

     THREE MONTHS ENDED MARCH 31, 1997
     ---------------------------------
     BASIC:
     Income available to common stockholders                  $        3,761           6,360,359    $       0.59
                                                                                                    ============   
     Effect of stock options                                              --             277,003
                                                              --------------   -----------------    
     DILUTED:
     Income available to common stockholders
      plus assumed exercises of stock options                 $        3,761           6,637,362    $       0.57
                                                              ==============   =================    ============   

</TABLE> 

 

                                       7
<PAGE>
 
   Below is the number and average exercise prices of options that were excluded
from the computation of diluted net income per share for each year because the
options' exercise prices were greater than the average market price of the
common shares.
<TABLE> 
<CAPTION> 
                                                                                                 AVERAGE
                                                                                                 EXERCISE
                                                                                   SHARES         PRICE
                                                                                ------------   -----------
<S>                                                                             <C>            <C> 
      Three Months Ended March 31, 1998                                            10,000       $  40.00
      Three Months Ended March 31, 1997                                             7,500       $  29.25
</TABLE> 

(6)  STOCK REPURCHASE PROGRAM

   In April 1998, the Company terminated its Stock Repurchase Program.  No
repurchases were made under the program during 1998.

                                       8
<PAGE>
 
                             BANCFIRST CORPORATION
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS



SUMMARY


   The Company reported net income of $3.97 million for the quarter ended
March 31, 1998, compared to net income of $3.76 million for the same quarter of
1997. Diluted net income per share was $0.60 for the first quarter of 1998,
compared to $0.57 per share for the first quarter of 1997.

   Total assets were $1.53 billion, an increase of $187 million from December
31, 1997 and $281 million from March 31, 1997.  The growth since year-end 1997
and the first quarter of 1997 was due to the acquisition of ten branches from
NationsBank, N.A. and internal growth.  Stockholders' equity rose to $126
million, an increase of $3.56 million compared to December 31, 1997 and $13.5
million compared to March 31, 1997.

RESULTS OF OPERATIONS

   Net interest income increased for the first quarter of 1998 by $1.54 million,
or 11.1%, as compared to the same quarter of 1997, primarily as a result of
earning asset growth.  Net interest spread was 4.22% for the quarter compared to
4.30% for the first quarter of 1997, while average net earning assets increased
$25.4 million, or 11.7%.  Net interest margin on a taxable equivalent basis was
5.09% for the first quarter, compared to 5.18% for the same quarter of 1997.

   The Company provided $577,000 for possible loan losses for the quarter,
compared to $96,000 for the first quarter of 1997, reflecting higher net
charge-offs and loan growth in 1998. Net loan charge-offs were $453,000 for the
first quarter of 1998, compared to $115,000 for the first quarter of 1997. The
net charge-offs in 1998 represent an annualized rate of 0.20% of total loans,
compared to a rate of 0.06% for the same quarter of 1997. While net charge-offs
increased in the first quarter over recent periods, asset quality remains high.

   Noninterest income increased $569,000, or 14.9%, compared to the first
quarter of 1997 due to higher service charges on deposits and other income, such
as trust fees and income from the origination and sale of residential mortgages.
Noninterest expense increased $1.36 million, or 11.8%, due largely to increased
staffing and other costs of expanding the Company's management and operational
infrastructure.

   Income tax expense increased $60,000 compared to the first three months of
1997.  The effective tax rate on income before taxes was 37%, down slightly from
38% in 1997.

FINANCIAL POSITION

   Total securities increased $86.6 million compared to December 31, 1997 and
$94.2 million compared to March 31, 1997, primarily due to cash received for the
assumption of net liabilities for the branches acquired from NationsBank, N.A.
The net unrealized gain on securities available for sale was $2.67 million at
the end of the first quarter of 1998, compared to a gain of $2.41 million at
December 31 and a loss of $469,000 at March 31, 1997.  The average taxable
equivalent yield on the securities portfolio for the first quarter increased to
6.48% from 6.45% for the same quarter of 1997.

   Total loans increased $68.9 million from December 31, 1997 and $143 million
from March 31, 1997, due to $30 million of loans acquired with the NationsBank
branches and internal growth.   The allowance for possible loan losses increased
$415,000 from year-end 1997 and $774,000 from the first quarter of 1997.  The
allowance as a percentage of total loans was 1.37%, 1.43% and 1.55% at March 31,
1998, December 31, 1997 and March 31, 1997, respectively.  The allowance to
nonperforming and restructured loans ratios at the same dates were 260.60%,
248.01% and 216.90%, respectively.

   Nonperforming and restructured assets totaled $5.69 million, compared to
$6.04 million at year-end 1997 and 

                                       9
<PAGE>
 
$5.9 million at March 31, 1997. Although the ratio of nonperforming and
restructured assets to total assets is only 0.37%, it is reasonable to expect
nonperforming loans and loan losses to rise over several years to historical
norms as a result of economic and credit cycles.

   Total deposits increased $183 million as compared to December 31, 1997 and
$261 million compared to March 31, 1997. The increases reflect the acquisition
of the NationsBank branches, which added approximately $132 million in deposits,
and internal growth.  The Company's deposit base continues to be comprised
substantially of core deposits, with large denomination certificates of deposit
being only 12.6% of total deposits at March 31, 1998.

   Short-term borrowings decreased $955,000 from December 31, 1997 and increased
$3.77 million from March 31, 1997. Fluctuations in short-term borrowings are a
function of liquidity needs and customer demand for repurchase agreements.

   Long-term borrowings decreased $27,000 from year-end 1997, and increased
$437,000 from the third quarter of 1997 due to principal payments in 1998 and
additional Federal Home Loan Bank borrowings during 1997.

   Stockholders' equity rose to $126 million from $123 million at year-end 1997
and $113 million at March 31, 1997. These increases were primarily the result of
accumulated earnings.  In April 1998, the Company terminated its Stock
Repurchase Program.  No repurchases were made under the program during 1998.
Average stockholders' equity to average assets for the quarter was 8.96%,
compared to 9.14% for the same quarter of 1997.  The Company's leverage ratio
and total risk-based capital ratio were 8.43% and 14.94%, respectively, at March
31, 1998, well in excess of the regulatory minimums.

                                       10
<PAGE>
 
                             BANCFIRST CORPORATION
                  SELECTED CONSOLIDATED FINANCIAL STATISTICS
                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)
<TABLE> 
<CAPTION> 
                                                                                                         THREE MONTHS ENDED
                                                                                                              MARCH 31,
                                                                                                     --------------------------- 
                                                                                                        1998            1997   
PERFORMANCE STATISTICS                                                                               -----------    ------------ 
<S>                                                                                                  <C>            <C> 
Net income per share - basic                                                                         $      0.62    $       0.59
Net income per share - diluted                                                                              0.60            0.57
Cash dividends per share                                                                                    0.12            0.10
Return on average assets                                                                                    1.15%           1.23%
Return on average stockholders' equity                                                                     12.83           13.51
Efficiency ratio                                                                                           65.08           65.16
</TABLE> 
<TABLE> 
<CAPTION> 
                                                                                               MARCH 31,            DECEMBER 31,
                                                                                      --------------------------                 
BALANCE SHEET AND ASSET QUALITY                                                          1998           1997            1997
  STATISTICS                                                                          -----------    -----------    ------------ 
<S>                                                                                   <C>            <C>            <C> 
Book value per share                                                                  $     19.88    $     17.82    $      19.37
Tangible book value per share                                                               16.37          15.63           17.40
Average loans to deposits (year-to-date)                                                    72.32%         70.59%          71.47%
Nonperforming and restructured assets to total assets                                        0.37           0.44            0.45
Allowance for possible loan losses to total loans                                            1.37           1.55            1.43
Allowance for possible loan losses to nonperforming                                                                     
  and restructured loans                                                                   260.60         216.90          248.01
</TABLE> 
<TABLE> 
<CAPTION> 
                                                                                     THREE MONTHS ENDED MARCH 31,
                                                                        -------------------------------------------------------- 
                                                                                  1998                         1997
                                                                        -------------------------    --------------------------- 
                                                                                        AVERAGE                       AVERAGE
CONSOLIDATED AVERAGE BALANCE SHEETS                                       AVERAGE        YIELD/         AVERAGE        YIELD/
  AND INTEREST MARGIN ANALYSIS                                            BALANCE         RATE          BALANCE         RATE
  TAXABLE EQUIVALENT BASIS                                              -----------   -----------    -----------    ------------ 
<S>                                                                     <C>           <C>            <C>            <C> 
Earning assets:
  Loans                                                                 $   884,580          9.61%   $   769,296            9.60%
  Securities                                                                327,249          6.48        298,672            6.45
  Federal funds sold                                                         33,576          6.00         28,183            5.31
                                                                        -----------                  ----------- 
    Total earning assets                                                  1,245,405          8.69      1,096,151            8.61
                                                                        -----------                  ----------- 
Nonearning assets:                                                                                                    
  Cash and due from banks                                                    87,599                       75,482      
  Interest recievable and other assets                                       79,918                       75,671      
  Allowance for possible loan losses                                        (12,389)                     (11,937)     
                                                                        -----------                  ----------- 
    Total nonearning assets                                                 155,128                      139,216      
                                                                        -----------                  ----------- 
    Total assets                                                        $ 1,400,534                  $ 1,235,367      
                                                                        ===========                  =========== 
Interest-bearing liabilities:                                                                                         
  Interest-bearing deposits                                             $   959,358          4.31%   $   854,642            4.17%
  Short-term borrowings                                                      11,419          5.44          2,131            4.00
  Long-term borrowings                                                        7,037          6.14          6,625            5.88
  9.65% Capital Securities                                                   25,000          9.96         15,602            9.70
                                                                        -----------                  ----------- 
    Total interest-bearing liabilities                                    1,002,814          4.48        879,000            4.31
                                                                        -----------                  ----------- 
Interest-free funds:                                                                    
  Noninterest-bearing deposits                                              263,836                      235,162
  Interest payable and other liabilities                                      8,383                        8,316
  Stockholders' equity                                                      125,501                      112,889 
                                                                        -----------                  ----------- 
    Total interest-free funds                                               397,720                      356,367 
                                                                        -----------                  ----------- 
    Total liabilities and stockholders' equity                          $ 1,400,534                  $ 1,235,367 
                                                                        ===========                  =========== 
Net interest spread                                                                          4.22%                          4.30%
                                                                                      ===========                   ============ 
Net interest margin                                                                          5.09%                          5.15%
                                                                                      ===========                   ============ 
</TABLE> 

                                       11
<PAGE>
 
                          PART II  OTHER INFORMATION


ITEM 5.  OTHER INFORMATION.

   In May 1998, the Company entered into a merger agreement with AmQuest
Financial Corp. ("AmQuest") of Duncan, Oklahoma.  The merger is expected to be
completed in September 1998 and would be effected through the exchange of a
maximum of 2,625,000 shares of BancFirst Corporation common stock for all of the
AmQuest common stock outstanding. The authorized common stock of the Company
would be increased and the shares for the exchange would be issued from the
authorized and unissued shares of the Company. AmQuest would be merged into
BancFirst Corporation, which would be the surviving company.  A Form S-4
Registration Statement would be filed to register the transaction.  In addition,
the merger agreement requires that a Form S-8 Registration Statement be filed
subsequent to the merger to allow certain shareholders who will be affiliates of
the Company to sell in the public markets the Company common stock that they
receive in the exchange.  The terms of the merger were negotiated through
AmQuest's financial advisor and with AmQuest's senior management and principal
stockholders.  During the negotiations, the Company's management considered a
number of factors relating to AmQuest, including its historical and projected
earnings, its asset quality, fair values of certain of its assets, its level of
capital, and potential efficiencies that might be achieved after the merger.
AmQuest has approximately $568,000 in total assets and operates two subsidiary
banks, AmQuest Bank, N.A. and Exchange National Bank & Trust Company.  These
AmQuest subsidiaries would become wholly-owned subsidiaries of BancFirst
Corporation.  The merger is subject to shareholder and regulatory approvals and
will be accounted for as a pooling of interests.

ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K.
     (a)  Exhibits

<TABLE>
<CAPTION>
 
 
 
     EXHIBIT
     NUMBER                                        EXHIBIT
    --------    ----------------------------------------------------------------------------
    <S>         <C>
      2.1       Purchase and Assumption Agreement between NationsBank, N.A. and BancFirst
                dated September 26, 1997 (filed as exhibit 2.4 to the Company's Quarterly
                Report on Form 10-Q for the quarter ended September 30, 1997 and
                incorporated herein by reference).

     2.2*       Merger Agreement dated May 6, 1998 between BancFirst Corporation and
                AmQuest Financial Corp.

     3.1        Amended and Restated Certificate of Incorporation (filed as Exhibit No. 33 to the
                Company's Registration Statement on form S-2, File No. 33-58804, and incorporated herein
                by reference).

     3.2        Certificate of Amendment to the Amended and Restated Certificate of Incorporation (filed
                as Exhibit 3.2 to the Company's Annual Report on Form 10-K for the fiscal year ended
                December 31, 1993 and incorporated herein by reference).

     3.3        Certificate of Amendment to the Amended and Restated Certificate of Incorporation (filed
                as Exhibit 3.0 to the Company's Quarterly Report on Form 10-Q for the quarter ended
                September 30, 1996 and incorporated herein by reference).

     3.4        Amended By-Laws (filed as Exhibit 3.2 to the Company's Annual Report on Form 10-K for the
                fiscal year ended December 31, 1992 and incorporated herein by reference).

     4.1        Amended and Restated Declaration of Trust of BFC Capital Trust I dated as
                of February 4, 1997 (filed as Exhibit 4.1 to the Company's Current Report
                on Form 8-K dated February 4, 1997 and incorporated herein by reference.)

     4.2        Indenture dated as of February 4, 1997 (filed as Exhibit 4.2 to the
                Company's Current Report on Form 8-K dated February 4, 1997 and
                incorporated herein by reference.)

     4.3        Series A Capital Securities Guarantee Agreement dated as of February 4,
                1997 (filed as Exhibit 4.3 to the Company's Current Report on Form 8-K
                dated February 4, 1997 and incorporated herein by reference.)

</TABLE> 

                                       12
<PAGE>
 
<TABLE> 
<CAPTION> 

     EXHIBIT
     NUMBER                                        EXHIBIT
    --------    ----------------------------------------------------------------------------
    <S>         <C>
     27.1*      Financial Data Schedule.
    ---------------------------------------------------------------------------------------- 
    *Filed
     herewith
</TABLE>
   (b) No reports on Form 8-K have been filed by the Company during the quarter
       ended March 31, 1998.

                                       13
<PAGE>
 
                                 SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                    BANCFIRST CORPORATION
                                    ---------------------
                                        (Registrant)



Date May 15, 1998                   /s/Randy P. Foraker
     ------------                   --------------------------------------
                                           (Signature)
                                    Randy P. Foraker
                                    Senior Vice President and Controller;
                                    Assistant Secretary/Treasurer
                                    (Principal Accounting Officer)

                                       14

<PAGE>
 
                                                                     EXHIBIT 2.2


                               MERGER AGREEMENT


MERGER AGREEMENT dated as of May 6, 1998 (hereinafter called the "Merger
Agreement"), between AmQuest Financial Corp. (hereinafter called "AMQUEST") and
BancFirst Corporation (hereinafter called "BANCFIRST").

                                  WITNESSETH:

AMQUEST is a corporation duly organized under the laws of the State of Oklahoma.
As of March 31, 1998, AMQUEST had authorized capital stock consisting of
6,000,000 shares of common stock having a par value of $1.67 per share ("AMQUEST
Common"), of which a total of 3,160,751 shares were issued and outstanding and
154,902 of which were shares subject to purchase options.   Except as set forth
in Exhibit A hereto, AMQUEST, or a subsidiary of AMQUEST, owns, beneficially and
of record, all of the issued and outstanding capital stock of the banks (the
"Banks") and of the corporations and/or limited liability companies (together,
the "Companies") listed in Exhibit A hereto.  The Banks and the Companies are
hereinafter sometimes referred to collectively as "Subsidiaries" and each,
sometimes, as a "Subsidiary."

BANCFIRST is a corporation duly organized under the laws of the State of
Oklahoma.  As of the date of this Agreement, BANCFIRST had capital stock of $22
million divided into $7.5 million shares of common stock having a par value of
$1.00 per share ("BANCFIRST Common"), of which 6,777,969 are issued and
outstanding and 900,000 shares of 10% cumulative Preferred Stock, $5.00 par
value, of which no shares are issued and outstanding and 10 million shares of 10
million Preferred Stock, $1.00 par value, of which no shares are issued and
outstanding.

The respective Boards of Directors of AMQUEST and BANCFIRST have each approved
this Merger Agreement and the consummation of the transactions contemplated
hereby and have approved the execution and delivery of this Merger Agreement.
This Merger Agreement provides for the merger of AMQUEST with and into BANCFIRST
upon the terms and conditions of this Merger Agreement (the "Merger").
BANCFIRST will be the surviving corporation of the Merger. From and after the
time the Merger shall become effective as set forth in Section 4 of this Merger
Agreement, and as and when required by this Merger Agreement, BANCFIRST will
issue shares of BANCFIRST Common and in exchange for all of the issued and
outstanding shares of AMQUEST 

                                      -1-
<PAGE>
 
Common. It is understood by each of the parties hereto that BANCFIRST seeks, as
a result of the Merger, to acquire AMQUEST, the Banks and the Companies and all
of their respective operating assets and liabilities.

Subject to the terms and conditions of this Merger Agreement, all parties will
exert their reasonable best efforts to obtain such regulatory approvals and to
effect such other actions as are necessary or appropriate to consummate the
Merger.  In no event will BANCFIRST issue more than 2,625,000 Shares of
BANCFIRST Common in connection with the transactions contemplated by this Merger
Agreement.

BANCFIRST and AMQUEST intend that the Merger be a tax-free reorganization within
the meaning of Section 368(a) of the Internal Revenue Code and to be accounted
for as a pooling of interests pursuant to APB Opinion No.16.

In consideration of the premises, AMQUEST and BANCFIRST hereby make this Merger
Agreement and prescribe the terms and conditions of the Merger and the mode of
carrying the Merger into effect as follows:

1.   Merger.  Subject to the terms and conditions hereinafter set forth in this
     Merger Agreement, AMQUEST shall be merged with and into BANCFIRST pursuant
     to and in accordance with applicable provisions of the Oklahoma General
     Corporation Act ("Oklahoma GCA").

2.   Name.  The name of the surviving corporation (hereinafter called the
     "Surviving Corporation" whenever reference is made to it as of the
     Effective Time or thereafter) shall be "BancFirst Corporation."

3.   Business.  The business of BANCFIRST as the Surviving Corporation shall be
     that of a bank holding company.  The Surviving Corporation shall exist by
     virtue of, and be governed by, the laws of the State of Oklahoma and shall
     have its principal office at 101 North Broadway, Oklahoma City, Oklahoma.

4.   Effective Time of Merger; Certificate of Incorporation.  The Merger shall
     become effective in accordance with applicable provisions of Section 1081
     of the Oklahoma GCA upon the later of (i) the time a certificate of merger,
     certified copy of the Merger Agreement or other document or documents
     effecting the Merger under the Oklahoma GCA are filed with the 

                                      -2-
<PAGE>
 
     Secretary of State of the State of Oklahoma (the "Oklahoma State Filing")
     and (ii) that time, if any, subsequent to the time of the Oklahoma State
     Filing, designated in the Oklahoma State Filing as the time the merger
     shall become effective (the "Effective Time").

     The Certificate of Incorporation of BANCFIRST in effect as of the Effective
     Time shall be the Certificate of Incorporation of the Surviving Corporation
     and the By-laws of BANCFIRST in effect as of the Effective Time shall be
     the By-laws of the Surviving Corporation.

5.   Effect of Merger.  At the Effective Time, the separate corporate existence
     of AMQUEST and BANCFIRST, respectively, shall, as provided in applicable
     provisions of the Oklahoma GCA be merged into and continued in BANCFIRST as
     the Surviving Corporation, which shall be deemed to be the same corporation
     as AMQUEST and BANCFIRST.  All rights, franchises and interests of AMQUEST
     and BANCFIRST, respectively, in and to every type of property, real,
     personal and mixed, and chooses in action, shall be transferred to and
     vested in BANCFIRST as the Surviving Corporation by virtue of the Merger
     without any deed or other transfer in the same manner and to the same
     extent as such rights, franchises and interests were held or enjoyed by
     AMQUEST and BANCFIRST, respectively, at the Effective Time, as provided in
     applicable provisions of the Oklahoma GCA.

6.   Liabilities upon Merger.  The Surviving Corporation shall be responsible
     for all of the liabilities of every kind and description of AMQUEST and
     BANCFIRST existing as of the Effective Time, except as may be specifically
     provided otherwise in this Merger Agreement.

7.   Conversion of Shares.

     (a)  At the Effective Time:

      (i)   Each of the not more than 3,315,653 shares of AMQUEST Common that
            shall be issued and outstanding immediately prior to the Effective
            Time, including shares issued as a result of the exercise of stock
            options, except for shares of AMQUEST Common subject to the rights
            of a dissenting shareholder, shall thereupon and without further
            action be converted into .7917 shares of BANCFIRST Common, subject,
            however, to the provisions set forth in Section 7(c) herein relative
            to 

                                      -3-
<PAGE>
 
            fractional shares and to possible adjustments as set forth in
            Section 17(f) herein (the "Exchange Rate").

       (ii) Any shares of AMQUEST Common held by AMQUEST as treasury stock
            immediately prior to the Effective Time shall be canceled and shall
            not represent capital stock of the Surviving Corporation and shall
            not be exchanged for shares of BANCFIRST Common.

   (b) AMQUEST's shareholders of record at the Effective Time, for the shares of
       AMQUEST Common then held by them, respectively, shall be allocated and be
       entitled to receive (upon surrender of certificates formerly representing
       shares of AMQUEST Common for cancellation) certificates for shares of
       BANCFIRST Common as shall be equal to (x) the number of shares of AMQUEST
       Common outstanding immediately prior to the Effective Time multiplied by
       (y) the Exchange Rate.

   (c) No certificate for fractional shares of BANCFIRST Common will be issued
       by BANCFIRST in connection with the exchange contemplated by the Merger,
       but in lieu thereof, any holder of AMQUEST Common shall, upon surrender
       of the certificate or certificates representing such AMQUEST Common, be
       paid cash, without interest, by BANCFIRST for such fractional shares on
       the basis of the average of the closing prices of BANCFIRST Common as
       reported in The Wall Street Journal for each of the days included in the
       Valuation Period.  The term "Valuation Period" shall mean the ten
       consecutive NASD trading days ending on the sixth NASD trading day
       immediately prior to the proposed Effective Time, as designated by
       BANCFIRST pursuant to Section 10(c) of this Merger Agreement.

   (d) As soon as practicable after the Effective Time, holders of certificates
       formerly representing shares of AMQUEST shall be instructed to tender
       such certificates to BANCFIRST pursuant to a letter of transmittal which
       shall be delivered to such shareholders by BANCFIRST and, subject to the
       provisions set forth above relating to fractional shares, BANCFIRST, or
       BancTrust, a division of BancFirst, as Exchange Agent for BANCFIRST, will
       distribute to such holders of certificates formerly representing shares
       of AMQUEST Common in exchange for and upon surrender for cancellation by
       such holders of a certificate or certificates formerly representing
       shares of AMQUEST Common the certificate(s) for shares of BANCFIRST
       Common in accordance with the 

                                      -4-
<PAGE>
 
       Exchange Rate. Each certificate formerly representing AMQUEST Common
       (other than certificates representing shares of AMQUEST Common subject to
       the rights of dissenting shareholders) shall be deemed for all purposes
       to evidence the ownership of the number of shares of BANCFIRST Common and
       cash for fractional shares into which such shares have been converted,
       except, however, and notwithstanding the foregoing, that, until such
       surrender of the certificate or certificates formerly representing shares
       of AMQUEST Common, the holder thereof shall not be entitled to receive
       any dividend or other payment or distribution payable to holders of
       BANCFIRST Common. Upon such surrender (or, in lieu of surrender, other
       provisions reasonably satisfactory to BANCFIRST as are made as set forth
       in the next following paragraph), there shall be paid to the person
       entitled thereto the aggregate amount of dividends or other payments or
       distributions (in each case without interest) which became payable after
       the Effective Time on the whole shares of BANCFIRST Common represented by
       the certificates issued upon such surrender and exchange or in accordance
       with such other provisions, as the case may be. After the Effective Time,
       the holders of certificates formerly representing shares of AMQUEST
       Common shall cease to have rights with respect to such shares (except
       such rights, if any, as they may have as dissenting shareholders), and
       except as aforesaid, their sole rights shall be to exchange said
       certificates for shares of BANCFIRST Common and cash for fractional
       shares in accordance with this Merger Agreement.

       Certificates formerly representing shares of AMQUEST Common surrendered
       for cancellation by each shareholder entitled to exchange shares of
       AMQUEST Common for shares of BANCFIRST Common by reason of the Merger
       shall be appropriately endorsed or accompanied by such appropriate
       instruments of transfer as BANCFIRST may reasonably require; provided,
       however, that if there be delivered to BANCFIRST by any person who is
       unable to produce any such certificate formerly representing shares of
       AMQUEST Common for transfer (i) evidence to the reasonable satisfaction
       of BANCFIRST that any such certificate has been lost, wrongfully taken or
       destroyed, and (ii) such security or indemnity as reasonably may be
       requested by BANCFIRST to save it and BancTrust harmless, and (iii)
       evidence to the reasonable satisfaction of BANC FIRST that such person is
       the owner of the shares theretofore represented by each certificate
       claimed by him to be lost, wrongfully taken or destroyed and that he is
       the person who would be entitled to present each such certificate and to
       receive shares of BANCFIRST Common pursuant to this Merger Agreement,
       then BANCFIRST, in the absence of actual notice to it that any shares
       theretofore represented by any such certificate 

                                      -5-
<PAGE>
 
       have been acquired by a bona fide purchaser, shall deliver to such person
       the certificate(s) representing shares of BANCFIRST Common which such
       person would have been entitled to receive upon surrender of each such
       lost, wrongfully taken or destroyed certificate formerly representing
       shares of AMQUEST Common.

   (e) Prior to the Effective Time neither BANCFIRST nor AMQUEST shall declare a
       stock dividend or make distributions upon or subdivide, split up,
       reclassify or combine its shares of common stock or declare a dividend or
       make a distribution on its common stock in any security convertible into
       or exchangeable for its common stock.

8. Board of Directors and Employees; Name Changes.  The directors of BANCFIRST
   immediately prior to the Effective Time shall serve as the directors of the
   Surviving Corporation immediately following the Effective Time and until the
   next annual meeting of shareholders at which their respective successors are
   elected and qualified.  The officers and employees of the Surviving
   Corporation immediately following the Effective Time shall be the officers
   and employees of BANCFIRST immediately before the Effective Time.  The
   directors, officers and employees of the Subsidiaries immediately following
   the Effective Time shall be the directors, officers and employees of the
   respective Subsidiaries immediately before the Effective Time.

   AMQUEST will cooperate with BANCFIRST in the procurement of requisite
   corporate and regulatory approvals and will use its reasonable best efforts
   to take such other steps as are appropriate and necessary to effect, when and
   if requested by BANCFIRST, changes in the name of each of the Subsidiaries to
   include the words "BANCFIRST" so that such name changes will become effective
   at the Effective Time or such later dates as may be designated by BANCFIRST.

9. Stock Options.

   (a) As of the date of the Merger Agreement, there are outstanding and
       unexercised stock options for shares of AMQUEST Common held by directors,
       officers and employees of AMQUEST and its Subsidiaries.  Immediately
       following the Effective Time, all unexercised stock options for shares of
       AMQUEST Common issued to and held by directors, officers and employees of
       AMQUEST and its Subsidiaries immediately prior to the Effective Time
       shall be assumed by BANCFIRST and converted into options to 

                                      -6-
<PAGE>
 
        purchase that number of shares of BANCFIRST Common equal to the number
        of shares of AMQUEST Common subject to such unexercised options
        immediately prior to the Effective Time multiplied by the Exchange Rate.
        The per share exercise price of such options for shares of BANCFIRST
        Common shall be the exercise price applicable to the options for shares
        of AMQUEST Common converted into options for BANCFIRST shares divided by
        the Exchange Rate. Except as set forth herein, all terms and conditions
        of the stock option agreements for options for AMQUEST Common shall
        continue in full force and effect.

10. Undertakings of the Parties.  AMQUEST and BANCFIRST further agree as
    follows:

    (a) This Merger Agreement shall be submitted to the shareholders of AMQUEST
        and BANCFIRST for approval at meetings to be called and held in
        accordance with applicable law and the respective Certificates of
        Incorporation and By-laws of AMQUEST and BANCFIRST. Such shareholders'
        meetings will be scheduled to be held approximately 30 days following
        the mailing by AMQUEST and BANCFIRST of their proxy statements to their
        respective shareholders, which mailing will promptly follow the
        effective date of the registration statement to be filed by BANCFIRST
        with the Securities and Exchange Commission (the " SEC") as provided in
        Section 10(d). AMQUEST and BANCFIRST will cooperate with each other in
        order to facilitate the preparation, filing and clearance of the
        registration statement and the proxy statement under federal and state
        securities laws to be used with respect to such shareholders' meeting
        and the exchange of shares as contemplated by this Merger Agreement.

    (b) BANCFIRST will promptly prepare and file an application (believed in
        good faith by BANCFIRST to be substantially complete in form and
        substance) with the Board of Governors of the Federal Reserve System
        (the "Board") under appropriate provisions of Section 3 of the Bank
        Holding Company Act of 1956, as amended, and, if necessary, to the
        Oklahoma State Banking Board (the "Oklahoma Board") for prior approval
        of the Merger and/or the proposed acquisition of AMQUEST and/or one or
        more of the Subsidiaries by BANCFIRST. AMQUEST will furnish BANCFIRST
        such information, appropriate representations and documents as may be
        reasonably requested by BANCFIRST in connection therewith and will
        cooperate with BANCFIRST in the procurement of requisite corporate and
        regulatory approvals to effect the Merger. BANCFIRST will provide
        AMQUEST and its counsel with reasonable opportunity to

                                      -7-
<PAGE>
 
       comment on the applications which it proposes to file in connection with
       such regulatory approvals and will give due consideration to any comments
       of AMQUEST and its counsel before making such filings. BANCFIRST will use
       its reasonable best efforts to cause such applications to be approved by
       the Board and, if required, the Oklahoma Board and to obtain such other
       regulatory consents and approvals as may be necessary to facilitate the
       Merger, in each case as soon as possible, and will promptly provide
       AMQUEST with copies of all such applications together with correspondence
       to or from the Board and the Oklahoma Board related thereto.

   (c) The Effective Time shall occur, subject to Section 24 of this Merger
       Agreement, at such time as shall be designated by BANCFIRST which shall
       be a date not later than thirty (30) days following the latter of (A)
       receipt of all approvals of the Board and the Oklahoma Board and the
       expiration of any required waiting periods with respect thereto; (B)
       approval of the Merger by the shareholders of AMQUEST; and (C) approval
       of the Merger by the shareholders of BANCFIRST; provided, however, the
       Effective Time may be such other day as shall be agreed to by BANCFIRST
       and AMQUEST.  BANCFIRST and AMQUEST shall use their best efforts to cause
       the Effective Time to occur on or before September 30, 1998.

   (d) BANCFIRST will promptly prepare and file with the SEC and use its
       reasonable best efforts to cause to become effective as soon as possible,
       a registration statement, including the related prospectus and proxy
       statement referred to in Section 10(a) above (the "Proxy Statement"), and
       any required amendments thereto or supplements to any prospectus
       contained therein, relating to the exchange of BANCFIRST Common
       contemplated by this Merger Agreement.  BANCFIRST will provide AMQUEST
       and its counsel a reasonable opportunity to comment on such proposed
       filings and will give due consideration to any comments of AMQUEST and
       its counsel before making any such filings.  Such registration statement
       will not cover resales by any persons who may be considered
       "underwriters" under Rule 145(c) of the Securities Act of 1933, as
       amended (the "1933 Act").  BANCFIRST shall use its reasonable best
       efforts to have the shares of BANCFIRST Common qualified or exempted from
       qualification under all applicable state securities laws as soon as
       possible.  In the event that a stop order has been issued, or threatened,
       by the SEC, that suspends or would suspend the effectiveness of the
       registration statement, BANCFIRST shall use its reasonable best efforts
       to promptly remove, or cause not to be issued, any such stop order.

                                      -8-
<PAGE>
 
   (e) BANCFIRST will assume and pay all expenses incident to the obtaining of
       the requisite regulatory consents and approvals.  Without limiting the
       generality of the foregoing, the expenses to be assumed and paid by
       BANCFIRST shall include (i) all legal and other expenses and taxes
       incurred by BANCFIRST incident to the consummation of the Merger
       contemplated by this Merger Agreement, (ii) all legal and other expenses
       incurred by BANCFIRST incident to the preparation and filing of the
       applications to the Board, the Oklahoma Board and other requests for
       regulatory consents and approvals with the appropriate bank regulatory
       agencies as set forth in or contemplated by this Merger Agreement and
       (iii) all legal and other expenses, if any, incurred in connection with
       the registration and qualification of BANCFIRST Common under federal and
       state securities laws.  The expenses to be assumed and paid by BANCFIRST
       shall not include any legal, accounting or other expenses incurred by
       AMQUEST in the negotiation of the Merger, associated with the Proxy
       Statement, the examination or review of documents for its own benefit, in
       connection with its own corporate proceedings or with respect to any
       investment banker or advisor for services rendered on its behalf, all of
       which will be assumed and paid by AMQUEST.  BANCFIRST will pay the
       expenses of reproducing the Proxy Statement.

   (f) All information furnished by or on behalf of AMQUEST to BANCFIRST or any
       of its representatives in connection with this Merger Agreement (whether
       before or after the date of this Merger Agreement) will be kept
       confidential by BANCFIRST in accordance with the terms of that certain
       agreement dated March 6, 1998 (the "Confidentiality Agreement") between
       BANCFIRST and AMQUEST.

   (g) BANCFIRST will provide AMQUEST with copies of all filings made by
       BANCFIRST with the SEC under the Securities Exchange Act of 1934, as
       amended (the "1934 Act"), and the 1933 Act and the respective rules and
       regulations of the SEC thereunder at the time such filings are made at
       any time prior to the Effective Time.

   (h) BANCFIRST will furnish to AMQUEST all information concerning BANCFIRST
       reasonably required by AMQUEST in connection with the preparation of
       proxy solicitation materials for use in soliciting proxies in connection
       with the meeting of AMQUEST's shareholders called for the purpose of
       voting on the Merger and will promptly advise AMQUEST if BANCFIRST
       determines that any of such information is 

                                      -9-
<PAGE>
 
       or becomes false or misleading in any material respect. AMQUEST will
       furnish to BANCFIRST all information concerning AMQUEST and the
       Subsidiaries reasonably required by BANCFIRST in connection with
       BANCFIRST's preparation of the registration statement (including the
       related prospectus) and any required amendments or supplements thereto,
       or in connection with other filings by BANCFIRST relating to the
       registration of its shares and will promptly advise BANCFIRST if AMQUEST
       determines that any such information is or becomes false or misleading in
       any material respect.

   (i) No press release or other public disclosure of matters related to this
       Merger Agreement or any of the transactions contemplated hereby shall be
       made by AMQUEST or BANCFIRST unless the other party shall have provided
       its prior consent to the form and substance thereof; provided, however,
       that nothing herein shall be deemed to prohibit any party hereto from
       making any disclosure which its counsel deems necessary or advisable in
       order to fulfill such party's disclosure obligations imposed by law.

   (j) For not less than the three-year period immediately following the
       Effective Time, BANCFIRST shall make available adequate current public
       information about itself as that terminology is used in and as required
       by Rule 144(c) of the SEC under the 1933 Act.

   (k) AMQUEST will use its reasonable best efforts to cause each person who, in
       the joint opinion of counsel for BANCFIRST and AMQUEST, is at the
       Effective Time or was, at the time of AMQUEST's shareholders' meeting
       referred to in Section 10 hereof, an "affiliate" of AMQUEST  (as that
       term is used in Rules 144 and 145 promulgated by the SEC under the 1933
       Act), to execute and deliver to BANCFIRST the written undertakings in the
       form attached hereto as Exhibit B.

   (l) AMQUEST shall provide BANCFIRST with adequate opportunity to conduct such
       further reviews and examinations of the business, properties and
       conditions (financial and otherwise) of AMQUEST, as BANCFIRST shall deem
       prudent, provided that such investigations shall not interfere
       unreasonably with the normal operations of AMQUEST.

   (m) Prior to the Effective Time, BANCFIRST will file with the SEC and use its
       reasonable best efforts to cause to become effective not later than the
       Effective Time, a registration statement on Form S-8 or other appropriate
       form to register with the SEC the shares of BANCFIRST Common which may be
       issued to individuals upon the exercise of stock 

                                      -10-
<PAGE>
 
       options and/or other stock-related benefits assumed by BANCFIRST pursuant
       to this Merger Agreement and/or the Benefits Agreement and will use its
       reasonable best efforts to cause such registration statement to remain in
       effect until the exercise or expiration of all such options and/or other
       stock-related benefits. BANCFIRST shall use its reasonable best efforts
       to have the shares of BANCFIRST Common which may be issued upon the
       exercise of such options qualified or exempted from qualification from
       all applicable state securities laws.

   (n) BANCFIRST shall cause the shares of BANCFIRST Common Stock to be issued
       in the Merger and the shares of BANCFIRST Common Stock issuable upon
       exercise of the AMQUEST options assumed by BANCFIRST in connection with
       the Merger to be approved for listing on the NASDAQ NMS prior to the
       Closing Date.

   (o) As soon as reasonably practicable after the Effective Time, BANCFIRST
       shall provide employee benefit plans and arrangements to active employees
       of AMQUEST and its Subsidiaries that are the same as, or substantially
       the equivalent of, the employee benefit plans and arrangements of
       BANCFIRST as in effect immediately prior to the Effective Time or as may
       be modified or terminated from time to time thereafter by BANCFIRST.
       Pending such action, BANCFIRST shall maintain the effectiveness of the
       AMQUEST benefit plans. From and after the Effective Time, BANCFIRST shall
       also honor, and shall cause the AMQUEST Subsidiaries to honor, in
       accordance with their terms, all employment and severance agreements and
       arrangements which apply to employees of the AMQUEST as disclosed in the
       AMQUEST Disclosure Schedule. BANCFIRST further agrees that the employees
       of the AMQUEST shall be credited for their actual and credited service
       with the AMQUEST for purposes of eligibility, vesting and benefit accrual
       (except in the case of a defined benefit pension plan) in the employee
       plans provided by BANCFIRST. Such employees' benefits under BANCFIRST's
       medical benefit plan shall not be subject to any exclusions for any pre-
       existing conditions, and credit shall be received for any deductibles or
       out-of-pocket amounts previously paid. On or before the Effective Time,
       if the Board of Directors of AMQUEST so determine, AMQUEST may pay cash
       bonuses to its employees in an aggregate amount consistent with past
       practice. BANCFIRST will pay one week of severance pay for each year of
       service with a maximum of 26 weeks to any employee of AMQUEST terminated
       as a result of a position elimination within the first year.

                                      -11-
<PAGE>
 
    (p) AMQUEST and BANCFIRST shall each use its best efforts to cause the
        Merger to be treated as a reorganization within the meaning of Section
        368(a) of the Code and to obtain the opinion of counsel referred to in
        Section 12 to such effect. BANCFIRST and AMQUEST shall each use their
        best efforts to cause the Merger to be accounted for as a pooling of
        interests for financial accounting purposes pursuant to the provisions
        of APB 16 and the rules and interpretations of the SEC relating thereto
        and shall use their best efforts to cause their respective shareholders
        not to take any action that would adversely affect the ability of
        BANCFIRST to account for the Merger as a pooling of interests.

    (q) At the Effective Time or as soon thereafter as BANCFIRST shall change
        the name of the Banks, all rights to use the name "AmQuest Financial,"
        including, but not limited to, any federal or state trademarks or
        servicemarks related thereto, and any signage related thereto shall be
        assigned and conveyed by BANCFIRST and/or AMQUEST to the designees of
        AMQUEST without consideration, subject to the terms of a mutually
        acceptable agreement between the designees and BANCFIRST pursuant to
        which the designees agree that (i) "AmQuest Financial" will not be used
        anywhere in Oklahoma within one year following the Effective Time; and
        in any current AmQuest communication within two years following the
        Effective Time; and (ii) "AmQuest Financial" will not be used in
        commercial banking, savings bank or brokerage services in the state of
        Oklahoma for a period of three years following the Effective Time.

    (r) At the Effective Time, BANCFIRST shall enter into a registration rights
        agreement in the form attached hereto as Exhibit E with all of those
        shareholders of AMQUEST who, in the opinion of counsel to AMQUEST, may
        be considered affiliates of AMQUEST and who elect to be included in such
        agreement providing for the registration under the Securities Act of
        1933 of the shares of BANCFIRST issued to them in connection with the
        Merger on a Form S-3 shelf registration statement providing for sales
        and other dispositions from time to time in nonunderwritten
        transactions.

11. Dissenting Shareholders. Shareholders of AMQUEST Common who do not vote
    their shares in favor of the Merger and otherwise perfect applicable
    dissenters' rights will be entitled to applicable dissenters or appraisal
    rights, if any, under applicable provisions of the Oklahoma GCA.
    Consummation of the transactions contemplated by this Merger Agreement is

                                      -12-
<PAGE>
 
    specifically conditioned on the number of shares of AMQUEST Common as to
    which shareholder of AMQUEST exercise dissenting or appraisal rights, plus
    any "tainted" shares of AMQUEST Common held as treasury stock by AMQUEST,
    within the meaning of APB Opinion No. 16 totaling less than 10% of the
    number of shares of AMQUEST Common issued and outstanding at the Effective
    Time.

12. Tax Opinion.  BANCFIRST and AMQUEST shall use their respective reasonable
    best efforts to obtain from Crowe and Dunlevy a written opinion addressed to
    AMQUEST, its shareholders and BANCFIRST, that based upon the Internal
    Revenue Code of 1986, as amended (the "Internal Revenue Code"), the
    regulations thereunder and rulings issued by the Internal Revenue Service in
    transactions similar to those contemplated by this Merger Agreement:

    (a) The statutory Merger of AMQUEST with and into BANCFIRST will constitute
        a reorganization within the meaning of Section 368(a)(1)(A) of the
        Internal Revenue Code;

    (b) No gain or loss will be recognized by BANCFIRST or AMQUEST as a
        consequence of the transactions herein contemplated;

    (c) No gain or loss will be recognized by the shareholders of AMQUEST on the
        exchange of their shares of AMQUEST Common for shares of BANCFIRST
        Common (disregarding for this purpose any cash consideration received by
        such shareholders of AMQUEST Common, including any cash received
        pursuant to the exercise of statutory dissenters' rights or for
        fractional share interests to which they may be entitled);

    (d) The Federal income tax basis of the BANCFIRST Common (including
        fractional share interests to which they may be entitled) received by
        the shareholders of AMQUEST Common for their shares of AMQUEST Common
        will be the same as the Federal income tax basis of the AMQUEST Common
        surrendered in exchange therefor; and

    (e) The holding period of the BANCFIRST Common received by a shareholder of
        AMQUEST Common will include the period for which the AMQUEST Common
        exchanged therefor was held, provided the exchanged AMQUEST Common was
        held as a capital asset by such shareholder on the date of the exchange.

                                      -13-
<PAGE>
 
13. Representations and Warranties of BANCFIRST.  BANCFIRST represents and
    warrants to AMQUEST that, except as set forth in BANCFIRST's disclosure
    letter to AMQUEST dated May 6, 1998, and any attachments or schedules
    annexed thereto, and delivered to AMQUEST not later than the time of
    AMQUEST's execution of this Merger Agreement (the "BANCFIRST Disclosure
    Letter") and except as otherwise indicated below:

    (a) BANCFIRST is a corporation duly organized and validly existing in good
        standing under the laws of the State of Oklahoma, is a registered bank
        holding company under the Bank Holding Company Act of 1956, as amended,
        and is qualified to do business and is in good standing in the State of
        Oklahoma, together with all other jurisdictions where it is both
        required to so qualify and where the failure to so qualify would have a
        BANCFIRST Material Adverse Effect, as hereinafter defined. A BANCFIRST
        Material Adverse Effect is that which has or would have a material
        adverse effect on the business, operations, financial condition or
        results of operations of BANCFIRST and its subsidiaries, taken as a
        whole, or on the ability of BANCFIRST to consummate the transactions
        contemplated hereby. BANCFIRST has full power and authority (including
        all licenses, franchises, permits and other governmental authorizations
        which are legally required) to engage in the businesses and activities
        now conducted by it and its subsidiaries. BANCFIRST is not subject to
        any formal or informal agreement or understanding with, nor is it
        subject to any order of, any bank regulatory authority restricting or
        prohibiting or attempting to restrict or prohibit any activities or
        conduct of BANCFIRST. Subject only to obtaining the required regulatory
        and shareholder approvals, BANCFIRST is, and at all times after the date
        of this Merger Agreement to and including the Effective Time will be,
        authorized to effect the Merger under applicable law. As of March 31,
        1998 BANCFIRST had authorized capital stock of $22 million, divided into
        7.5 million shares of BANCFIRST Common, 6,362,699 of which shares of
        BANCFIRST Common were issued and outstanding, 900,000 shares of 10%
        Cumulative Preferred Stock par value $5.00 per share, of which no shares
        were issued and outstanding and 10 million shares of Senior Preferred
        Stock, $1.00 par value of which no shares are issued and outstanding.
        All of the issued and outstanding shares of BANCFIRST's capital stock
        are duly authorized, validly issued, fully paid, nonassessable and
        subject to no pre-emptive rights.

    (b) BANCFIRST has furnished to AMQUEST copies of the following financial
        statements relating to BANCFIRST and its consolidated subsidiaries: (i)
        the audited Consolidated Balance Sheets of BANCFIRST as of December 31,
        1996 and 1997 and the Consolidated 

                                      -14-
<PAGE>
 
        Statements of Income, Shareholders' Equity and Cash Flows for the years
        then ended, together with the notes thereto, as audited by Coopers &
        Lybrand, L.L.P., independent auditors; and (ii) the unaudited
        Consolidated Balance Sheet of BANCFIRST as at March 31, 1998 and the
        unaudited Consolidated Statements of Income for the period then ended,
        together with the notes thereto. Each of the aforementioned financial
        statements present fairly, in accordance with generally accepted
        accounting principles (applied on a consistent basis except as disclosed
        in the footnotes thereto), the consolidated financial p osition and
        results of operations of BANCFIRST as of the dates and for the periods
        therein set forth. Such financial statements do not, as of the dates
        thereof, include any material asset or omit any material liability,
        absolute or contingent, or other fact, the inclusion or omission of
        which renders such financial statements, in light of the circumstances
        under which they were made, misleading in any material respect. Since
        March 31, 1998, there has not been any change in the financial
        condition, results of operations or business of BANCFIRST and its
        subsidiaries that has had a BANCFIRST Material Adverse Effect.

    (c) Since December 31, 1994, BANCFIRST and each of its subsidiaries has
        filed all reports, registrations and statements, together with any
        required amendments thereto, that any of them was required to file with
        (i) the SEC, including, but not limited to, all Forms 10-K, Forms 10-Q,
        Forms 8-K, annual reports and proxy statements, (ii) the Board, (iii)
        the Federal Deposit Insurance Corporation (the "FDIC"), (iv) the
        Oklahoma Banking Department (the "OBD") and (v) any applicable state
        securities or banking authorities. All such reports and statements filed
        with any such regulatory body or authority are collectively referred to
        in this Merger Agreement as the BANCFIRST Reports. As of their
        respective dates, the BANCFIRST Reports complied in all material
        respects with the respective rules and regulations promulgated by the
        SEC, the Board, the FDIC, the OBD and state securities or banking
        authorities, and did not contain at the time filed any untrue statement
        of a material fact or omit to state a material fact required to be
        stated therein or necessary in order to make the statements therein, in
        light of the circumstances under which they were made, not misleading.

    (d) The Board of Directors of BANCFIRST has duly authorized (i) the
        execution and delivery of this Merger Agreement and approved the Merger
        as contemplated by said Merger Agreement and will recommend it to the
        BANCFIRST shareholders for adoption; and (ii) the increase in authorized
        common stock of BANCFIRST to 12 million shares and will 

                                      -15-
<PAGE>
 
        recommend such increase to the BANCFIRST shareholders. BANCFIRST has all
        requisite power and authority to enter into this Merger Agreement and,
        following the vote of its shareholders in favor of the Merger, and the
        authorization of additional shares to be issued in the Merger, BANCFIRST
        will have the authority to consummate the transactions contemplated
        hereby. Subject to the approval by the shareholders of BANCFIRST, this
        Merger Agreement constitutes the valid, legally binding and enforceable
        obligation of BANCFIRST and this Merger Agreement and the consummation
        of the Merger have been duly authorized and approved on behalf of
        BANCFIRST by all requisite corporate action. Provided the required
        approvals are obtained from the BANCFIRST shareholders, the Board and
        the Oklahoma Board, neither the execution and delivery of this Merger
        Agreement nor the consummation of the Merger will conflict with, result
        in the breach of, constitute a default under or accelerate the
        performance provided by the terms of any law, or any rule or regulation
        of any governmental agency or authority or any judgment, order or decree
        of any court, bank regulatory agency or other governmental agency to
        which BANCFIRST is subject, any contract, agreement or instrument to
        which BANCFIRST is a party or by which BANCFIRST is bound or committed,
        or the Certificate of Incorporation or By-laws of BANCFIRST, or
        constitute an event which with the lapse of time or action by a third
        party, could, to the best of the knowledge of BANCFIRST and its
        executive officers, after due inquiry, result in the default under any
        of the foregoing or result in the creation of any lien, charge or
        encumbrance upon any of the assets or properties of BANCFIRST or upon
        any of the stock of BANCFIRST or adversely affect the ability of
        BANCFIRST to consummate the transactions contemplated hereby, except, in
        the case of contracts, agreements or instruments, such defaults,
        conflicts or breaches which either (i) will be cured or waived prior to
        the Effective Time or (ii) if not so cured or waived would not, in the
        aggregate, have any BANCFIRST Material Adverse Effect.

    (e) The reserve for possible loan and lease losses shown on the March 31,
        1998 Consolidated Balance Sheet of BANCFIRST is adequate in all material
        respects under the requirements of generally accepted accounting
        principles to provide for possible losses, net of recoveries relating to
        loans previously charged off, on loans outstanding (including, without
        limitation, accrued interest receivable) as of March 31, 1998.

    (f) Except as disclosed in the financial statements referred to in Section
        13(b), there is no litigation, action, suit, investigation or proceeding
        pending or, to the best of the knowledge of BANCFIRST and its executive
        officers after due inquiry, overtly threatened against or 

                                      -16-
<PAGE>
 
        affecting BANCFIRST or its subsidiaries or involving any of their
        respective properties or assets, at law or in equity, before any
        federal, state, municipal, local or other governmental authority, which
        is reasonably likely to be resolved adversely to the interest of
        BANCFIRST or its subsidiaries and, if so resolved, would have a
        BANCFIRST Material Adverse Effect or materially impair its ability to
        perform under this Merger Agreement, and to the best of the knowledge
        and belief of BANCFIRST and its executive officers after due inquiry, no
        one has reasonable or valid g rounds on which it reasonably can be
        expected that anyone will assert or initiate any such litigation,
        action, suit, investigation or proceeding against BANCFIRST based upon
        the wrongful action or inaction of BANCFIRST or its subsidiaries or any
        of their respective officers, directors or employees.

    (g) At the Effective Time and on such subsequent dates when the former
        shareholders of AMQUEST surrender their certificates formerly
        representing shares of AMQUEST Common for cancellation and exchange, the
        shares of BANCFIRST Common to be exchanged with former shareholders of
        AMQUEST will be duly authorized and validly issued by BANCFIRST and will
        be fully paid and nonassessable and subject to no pre-emptive rights.

    (h) BANCFIRST and each of its subsidiaries have good and marketable title to
        all their respective assets and properties, whether real or personal,
        tangible or intangible, including without limitation the capital stock
        of its subsidiaries and all other assets and properties reflected in
        BANCFIRST's Balance Sheet as of March 31, 1998 or acquired subsequent
        thereto (except to the extent that such assets and properties have been
        disposed of for fair value in the ordinary course of business since
        March 31, 1998 ). Such assets and properties are subject to no liens,
        mortgages, security interests, encumbrances, pledges or charges of any
        kind, except (i) as noted in said Balance Sheet or the notes thereto;
        (ii) statutory liens for taxes not yet delinquent; (iii) landlord's
        liens; and (iv) minor defects and irregularities in title and
        encumbrances which do not materially impair the use thereof for the
        purposes for which they are held; and such liens, mortgages, security
        interests, encumbrances and charges do not, in the aggregate, have a
        BANCFIRST Material Adverse Effect. BANCFIRST and its subsidiaries as
        lessees have the unqualified right under valid and subsisting leases to
        occupy, use, possess and control all property leased by BANCFIRST and
        its subsidiaries. At the Effective Time all limitations affecting such
        properties will not, in the aggregate, have a BANCFIRST Material Adverse
        Effect.

                                      -17-
<PAGE>
 
   (i) To the best of the knowledge of BANCFIRST and its executive officers
       after due inquiry, BANCFIRST and its subsidiaries have complied with all
       laws, regulations and orders applicable to them and to the conduct of
       their businesses, including without limitation all statutes, rules and
       regulations pertaining to the conduct of banking activities except for
       violations which, together with any penalty which results therefrom, have
       not had and will not have a BANCFIRST Material Adverse Effect.  Neither
       BANCFIRST nor any of its subsidiaries is in default under, and no event
       has occurred which, to the best of the knowledge of BANCFIRST and its
       executive officers after due inquiry, is likely to result in a default
       under the terms of any judgment, decree, order, writ, rule or regulation
       of any governmental authority or court, whether federal, state or local
       and whether at law or in equity, in each case where the default has had
       or is likely to have a BANCFIRST Material Adverse Effect.

   (j) BANCFIRST has not incurred and will not incur directly or indirectly any
       liability for brokerage, finders', agents' or investment bankers' fees or
       commissions in connection with this Merger Agreement or the transactions
       contemplated hereby.

   (k) Each pension, stock bonus or purchase, profit-sharing, retirement, health
       and welfare plan maintained by or covering employees of BANCFIRST or any
       subsidiary of BANCFIRST (hereinafter referred to collectively as the
       "plans") which purports to be a qualified plan under Section 401(a) of
       the Internal Revenue Code is so qualified.  All of the plans which
       constitute employee benefit or employee welfare benefit plans subject to
       the Employee Retirement Income Security Act of 1974, as amended
       ("ERISA"), have been maintained in compliance in all material respects
       with the applicable requirements of ERISA.  All material notices, reports
       and other filings required under applicable law to be given or made to or
       with any governmental agency with respect to the plans have been timely
       filed or delivered.  BANCFIRST and its executive officers, after due
       inquiry, have no knowledge either of any circumstances which would
       adversely affect the qualification of the plans or their compliance with
       the applicable requirements of ERISA, would result or have resulted in
       liability under Title IV of ERISA or of any "reportable event" (as such
       term is defined in Section 4043(b) of ERISA) or any "prohibited
       transaction" (as such term is defined in Section 406 of ERISA and Section
       4975(c) of the Internal Revenue Code) which has occurred during the past
       five years and which could reasonably be expected to result in any
       material liability of BANCFIRST or any subsidiary to the Pension Benefit
       Guaranty Corporation (the "PBGC"), the Department of Treasury, the

                                      -18-
<PAGE>
 
       Department of Labor or any multiemployer plan.  Those plans which are
       defined benefit plans within the meaning of ERISA meet the minimum
       funding standards set forth in the Internal Revenue Code and ERISA and
       the assets of such plans equal or exceed the actual present value of
       accrued benefits under such plans determined on the basis of the
       actuarial assumptions contained in the plan's most recent actuarial
       valuation.  There are no pending or threatened claims (other than claims
       for benefits in the ordinary course), lawsuits or arbitrations which have
       been asserted or instituted against the plans, any fiduciaries thereof
       with respect to their duties to the plans or the assets of any of the
       trusts under any of the plans which could reasonably be expected to
       result in any material liability of BANCFIRST or any subsidiary to the
       PBGC, Department of Treasury, Department of Labor or any multiemployer
       plan.

   (l) Except where the failure to file would not have a BANCFIRST Material
       Adverse Effect on BANCFIRST and its subsidiaries, BANCFIRST and/or its
       subsidiaries have duly filed all federal, state, county and local income,
       franchise, bank, excise, real and personal property and other tax returns
       and reports (including, but not limited to, those relating to social
       security, withholding, unemployment insurance, and occupation (sales) and
       use taxes and those filed on a consolidated, combined or unitary basis)
       required to have been filed by BANCFIRST or its subsidiaries up to the
       date hereof.  All of the foregoing returns are true and correct in all
       material respects, and BANCFIRST and its subsidiaries have paid or, prior
       to the Effective Time, will pay all taxes, interest and penalties shown
       on such returns or reports as being due or (except to the extent the same
       are contested in good faith and, if material, summarized in the BANCFIRST
       Disclosure Letter) or claimed to be due to any federal, state, county,
       local or other taxing authority, and there is, and at the Effective Time
       will be, no basis for any additional claim or assessment which might have
       a BANCFIRST Material Adverse Effect, except for those being contested in
       good faith and summarized in the BANCFIRST Disclosure Letter.  BANCFIRST
       and its subsidiaries have paid or made adequate provision in its
       financial statements or its books and records for all taxes payable in
       respect of all periods ending on or before the date hereof.  BANCFIRST
       and its subsidiaries have, and at the Effective Time will have, no
       liability for any taxes, interest or penalties of any nature whatsoever,
       except for those taxes which may have arisen up to the Effective Time in
       the ordinary course of business and are properly accrued on the books of
       BANCFIRST as of the Effective Time or are being contested in good faith
       and have, if material, been summarized in the BANCFIRST Disclosure
       Letter.

                                      -19-
<PAGE>
 
   (m) BANCFIRST has in effect insurance coverage with reputable insurers, which
       in respect of amounts, premiums, types and risks insured, constitutes
       reasonably adequate coverage against all risks customarily insured
       against by bank holding companies comparable in size and operation to
       BANCFIRST.

   (n) Neither the Proxy Statement nor the related registration statement nor
       any amendment or supplement thereto that is filed with the SEC in
       connection with the transactions contemplated hereby (except for any
       information which has been or shall be supplied by AMQUEST for inclusion
       in the Proxy Statement and registration statement and is so included as
       so supplied) shall contain (in the case of information relating to the
       Proxy Statement, at the time it is mailed and in the case of information
       relating to the registration statement at the time it becomes effective
       and at the time of AMQUEST's shareholders' meeting) any untrue statement
       of a material fact or shall omit to state a material fact necessary to
       make the statements contained therein, in light of the circumstances in
       which they are made, not misleading.  The registration statement and any
       amendments or supplements thereto that are filed with the SEC in
       connection with the transactions contemplated hereby will comply as to
       form in all material respects with the provisions of the 1933 Act and the
       rules and regulations promulgated thereunder.

   (o) No employee of BANCFIRST or any of its subsidiaries is represented, for
       purposes of collective bargaining, by a labor organization of any type.
       BANCFIRST is unaware of any efforts during the past five years to
       unionize or organize any employees of BANCFIRST or any of its
       subsidiaries, and no claim related to such employees under the Fair Labor
       Standards Act, National Labor Relations Act, Civil Rights Act of 1964,
       Walsh-Healy Act, Davis Bacon Act, Civil Rights Act of 1866, Age
       Discrimination in Employment Act, Equal Pay Act of 1963, Executive Order
       No. 11246, Federal Unemployment Tax Act, Vietnam Era Veterans
       Readjustment Act, Occupational Safety and Health Act, or any state or
       local employment related law, order, ordinance or regulation, no unfair
       labor practice, discrimination or wage-and-hour claim is pending or, to
       the best of knowledge of BANCFIRST and its executive officers after due
       inquiry, threatened against BANCFIRST or any of its subsidiaries which
       claim has had or is reasonably likely to have a BANCFIRST Material
       Adverse Effect.

                                      -20-
<PAGE>
 
   (p) To the actual knowledge of BANCFIRST and its executive officers:  (i)
       with respect to any contaminant, pollutant, hazardous substance,
       hazardous waste, hazardous pollutant, toxic pollutant, toxic waste or
       toxic substance ("Contaminant"), there are no material actions,
       proceedings or investigations pending or threatened before any federal or
       state environmental regulatory body, or before any federal or state
       court, alleging non-compliance with or liability in connection with, by
       BANCFIRST or any of its subsidiaries, the Comprehensive Environmental
       Response, Compensation and Liability Act, 42 U.S.C. (S)(S)9601 et seq.
       ("CERCLA:), the Resource Conservation and Recovery Act, 42 U.S.C.
       (S)(S)6901 et seq. ("RCRA:), the Clean Water Act, 33 U.S.C. (S)(S)1251 et
       seq. ("CWA"), or the Clean Air Act, 42 U.S.C. (S)(S)7401 et seq. ("CAA"),
       as each is amended from time to time, or any other federal, state, local
       or municipal statute, ordinance or regulation, or order, ruling or other
       decision of any court, administrative agency or other governmental
       authority relating to health or safety or environmental protection (such
       statutes, ordinances, regulations, orders, rulings and decisions,
       together, "Environmental Laws"); (ii) neither BANCFIRST nor any of its
       subsidiaries is responsible in any material respect under any
       Environmental Law for any release by any person at or in the vicinity of
       real property of any Contaminant, including without limitation by
       spilling, leaking, pumping, pouring, emitting, emptying, discharging,
       injecting, escaping, leaching, dumping or disposing of any such
       Contaminant into the environment (collectively "Release"); (iii) neither
       BANCFIRST nor any of its subsidiaries is responsible for any material
       costs of any response action required by virtue of any Release of any
       Contaminant into the environment including, without limitation, costs
       arising from investigation, removal or remediation of Contaminants,
       security fencing, alternative water supplies, temporary evacuation and
       housing and other emergency assistance undertaken by any environmental
       regulatory body or any other person; (iv) BANCFIRST and its subsidiaries
       are, in all material respects, in compliance with all applicable
       Environmental Laws; and (v) no real property owned or used by BANCFIRST
       or any of its subsidiaries contains any Contaminant including, without
       limitation, any asbestos, PCBs or petroleum products or byproducts in any
       form, the presence, location or condition of which (a) is reasonably
       likely to require remediation or other corrective action pursuant to any
       Environmental Law in any material respect, or (b) otherwise would pose
       any significant health or safety risk unless remedial measures were
       taken.

                                      -21-
<PAGE>
 
    (q) The statements made in the BANCFIRST Disclosure Letter and any
        attachments thereto shall be deemed to constitute representations and
        warranties of BANCFIRST under this Merger Agreement to the same extent
        as if herein set forth in full. Anything disclosed in the BANCFIRST
        Disclosure Letter or the attachments thereto shall be considered to have
        been disclosed for purposes of all representations, warranties and
        covenants under this Merger Agreement.

14. Representations and Warranties of AMQUEST.  AMQUEST represents and warrants
    to BANCFIRST that, except as shall be set forth in AMQUEST's disclosure
    letter dated May 6, 1998, and any attachments or schedules annexed thereto,
    and delivered to BANCFIRST not later than the time of BANCFIRST's execution
    of this Merger Agreement (the "AMQUEST Disclosure Letter"), and except as
    indicated below:

    (a) AMQUEST is a corporation duly organized and validly existing in good
        standing under the laws of the State of Oklahoma, is a registered bank
        holding company under the Bank Holding Company Act of 1956, as amended,
        and is qualified to do business and is in good standing in the State of
        Oklahoma, together with all other jurisdictions where it is both
        required to so qualify and where the failure to so qualify would have a
        AMQUEST Material Adverse Effect, as hereinafter defined. An AMQUEST
        Material Adverse Effect is that which has or would have a material
        adverse effect on the business, operations, financial condition or
        results of operations of AMQUEST and the Subsidiaries taken as a whole,
        or on the ability of AMQUEST to consummate the transactions contemplated
        hereby. AMQUEST and the Subsidiaries each have full power and authority
        (including all licenses, franchises, permits and other governmental
        authorizations which are legally required) to engage in the businesses
        and activities now conducted by it. AMQUEST is not subject to any formal
        or informal agreement or understanding with, nor is it subject to any
        order of, any bank regulatory authority restricting or prohibiting or
        attempting to restrict or prohibit any activities or conduct of AMQUEST.
        Subject only to obtaining the required regulatory approvals and the
        approval of AMQUEST shareholders, AMQUEST is, and at all times after the
        date of this Merger Agreement to and including the Effective Time will
        be, authorized to effect the Merger under applicable law. As of March
        31, 1998, AMQUEST had authorized capital stock consisting of 6,000,000
        shares of AMQUEST Common, of which a total of 3,604,196 shares were
        issued and outstanding and 443,445 of which were shares of treasury
        stock owned by AMQUEST. All of the issued and outstanding shares of
        AMQUEST Common are duly authorized, validly issued, fully paid,

                                      -22-
<PAGE>
 
       nonassessable and subject to no pre-emptive rights. There are no
       outstanding options, warrants, stock appreciation rights or commitments
       of any kind related to AMQUEST's capital stock or the exchange of
       AMQUEST's capital stock except for outstanding stock options which have
       been granted related to the purchase of not more than 154,902 shares of
       AMQUEST Common.

   (b) AMQUEST has furnished to BANCFIRST copies of the following financial
       statements relating to AMQUEST and the Subsidiaries on a consolidated
       basis:  (i) the audited Consolidated Balance Sheet of AMQUEST as of
       December 31, 1996 and 1997, and the Consolidated Statements of Income,
       Stockholders' Equity and Cash Flows for the years then ended, together
       with the notes thereto, as audited by Arthur Andersen, L.L.P., Certified
       Public Accountants; and (ii) the unaudited Consolidated Balance Sheet of
       AMQUEST as at March 31, 1998 and the unaudited Consolidated Statement of
       Income for the period then ended.  Each of the aforementioned financial
       statements presents fairly, in accordance with generally accepted
       accounting principles (applied on a consistent basis except as disclosed
       in the footnotes thereto), the consolidated financial position and
       results of operations of AMQUEST as of the dates and for the periods
       therein set forth.  Such financial statements do not, as of the dates
       thereof, include any material asset or omit any material liability,
       absolute or contingent, or other fact, the inclusion or omission of which
       renders such financial statements, in light of the circumstances under
       which they were made, misleading in any material respect.  Since March
       31, 1998, there has not been any change in the financial condition,
       results of operations or business of AMQUEST and the Subsidiaries that
       has had a AMQUEST Material Adverse Effect.

   (c) Since December 31, 1994, AMQUEST and each of the Subsidiaries has filed
       all reports, registrations and statements, together with any required
       amendments thereto, that any of them was required to file with (i) the
       Board, (ii) the FDIC, (iii) OCC and (iv) any applicable state securities
       or banking authorities.  All such reports and statements filed with any
       such regulatory body or authority are collectively referred to in this
       Merger Agreement as the "AMQUEST Reports."  As of their respective dates,
       the AMQUEST Reports complied in all material respects with the respective
       rules and regulations promulgated by the Board, the FDIC, the OCC and
       state securities or banking authorities, and did not contain at the time
       filed any untrue statement of a material fact or omit to state a material
       fact required to be stated therein or necessary in order to make the
       statements therein, in light of the circumstances under which they were
       made, not misleading.

                                      -23-
<PAGE>
 
   (d) The Board of Directors of AMQUEST has duly authorized the execution and
       delivery of this Merger Agreement and approved the Merger as contemplated
       by the Merger Agreement and, subject to the fiduciary duties of the Board
       of Directors, will recommend it to the AMQUEST shareholders for adoption.
       Subject to the approval by the shareholders of AMQUEST, this Merger
       Agreement constitutes the valid, legally binding and enforceable
       obligation of AMQUEST and AMQUEST has all requisite power and authority
       to enter into this Merger Agreement and AMQUEST has the authority to
       consummate the transactions contemplated hereby so that, provided all
       such shareholder and regulatory approvals are obtained, neither the
       execution and delivery of this Merger Agreement nor the consummation of
       the Merger will conflict with, result in the breach of, constitute a
       default under or accelerate the performance provided by the terms of any
       law, or any rule or regulation of any governmental agency or authority or
       any judgment, order or decree of any court, bank regulatory agency or
       other governmental agency to which AMQUEST is subject, any contract,
       agreement or instrument to which AMQUEST is a party or by which AMQUEST
       is bound or committed, or the Certificate of Incorporation or By-Laws of
       AMQUEST, or constitute an event which with the lapse of time or action by
       a third party, could, to the best of the knowledge of AMQUEST and its
       executive officers after due inquiry, result in the default under any of
       the foregoing or result in the creation of any lien, charge or
       encumbrance upon any of the assets or properties of AMQUEST or upon any
       of AMQUEST's capital stock; except, in the case of contracts, agreements
       or instruments, such defaults, conflicts or breaches which either (i)
       will be cured or waived prior to the Effective Time or (ii) if not so
       cured or waived would not, in the aggregate, have a AMQUEST Material
       Adverse Effect.

   (e) The reserve for possible loan and lease losses shown on the March 31,
       1998 Consolidated Balance Sheet of AMQUEST is adequate in all material
       respects under the requirements of generally accepted accounting
       principles to provide for possible losses, net of recoveries relating to
       loans previously charged off, on loans outstanding (including, without
       limitation, accrued interest receivable) as of March 31, 1998.

   (f) Except as disclosed in the financial statements referred to in Section
       14(b), there is no litigation, action, suit, investigation or proceeding
       pending or, to the best of the knowledge AMQUEST and its executive
       officers after due inquiry, overtly threatened, against or affecting
       AMQUEST or any of its Subsidiaries or involving any of their respective
       properties or assets, at law or in equity, before any federal, state,
       municipal, local or other 

                                      -24-
<PAGE>
 
       governmental authority which is reasonably likely to be resolved
       adversely to the interest of AMQUEST or its Subsidiaries and, if so
       resolved, would have a AMQUEST Material Adverse Effect, and to the best
       of the knowledge and belief of AMQUEST and its executive officers after
       due inquiry, no one has reasonable or valid grounds on which it
       reasonably can be expected that anyone will assert or initiate any such
       litigation, action, suit, investigation or proceeding against AMQUEST
       based upon the wrongful action or inaction of AMQUEST or any of its
       Subsidiaries or any of their respective officers, directors or employees.

   (g) AMQUEST and its Subsidiaries have good and marketable title to all their
       respective assets and properties, whether real or personal, tangible or
       intangible, including without limitation the capital stock of its
       Subsidiaries and all other assets and properties reflected in AMQUEST's
       Balance Sheet as of March 31, 1998 or acquired subsequent thereto (except
       to the extent that such assets and properties have been disposed of for
       fair value in the ordinary course of business since March 31, 1998). Such
       assets and properties are subject to no liens, mortgages, security
       interests, encumbrances, pledges or charges of any kind, except (i) as
       reflected in said Balance Sheet or the notes thereto; (ii) statutory
       liens for taxes not yet delinquent; (iii) landlord's liens; and (iv)
       minor defects and irregularities in title and encumbrances which do not
       materially impair the use thereof for the purposes for which they are
       held; and such liens, mortgages, security interests, encumbrances and
       charges do not, in the aggregate, have a AMQUEST Material Adverse Effect.
       AMQUEST and its Subsidiaries as lessee have the unqualified right under
       valid and subsisting leases to occupy,  use, possess and control all
       property leased by AMQUEST and its Subsidiaries.  At the Effective Time
       all limitations affecting such properties will not, in the aggregate,
       have a AMQUEST Material Adverse Effect.

   (h) To the best of the knowledge of AMQUEST and its executive officers after
       due inquiry, AMQUEST and its Subsidiaries have complied with all laws,
       regulations and orders applicable to them and to the conduct of their
       businesses, including without limitation, all statutes, rules and
       regulations pertaining to the conduct of banking activities except for
       violations which together with any penalty which results therefrom have
       not had and will not have a AMQUEST Material Adverse Effect.  Neither
       AMQUEST nor any of its Subsidiaries is in default under, and no event has
       occurred which, to the best of the knowledge of AMQUEST and its executive
       officers after due inquiry, is likely to result in the default under the
       terms of any judgment, decree, order, writ, rule or regulation of 

                                      -25-
<PAGE>
 
       any governmental authority or court, whether federal, state or local and
       whether at law or in equity, in each case when the default has had or is
       likely to have a AMQUEST Material Adverse Effect.

   (i) AMQUEST has not incurred and will not incur any liability for brokerage,
       finders', agents', or investment bankers' fees or commissions in
       connection with this Merger Agreement or the transactions contemplated
       hereby except for fees to Howe Barnes Investments, Inc. to be determined
       in accordance with the terms of that certain engagement letter dated
       January 27, 1998, which is annexed as an exhibit to the AMQUEST
       Disclosure Letter, which fees will be accrued as a liability of AMQUEST
       not later than the end of the month prior to the Effective Time.

   (j) Except as set forth in the AMQUEST Document List (the "AMQUEST Document
       List") attached to the AMQUEST Disclosure Letter, neither AMQUEST nor any
       of its Subsidiaries is a party to or bound by any written or oral (i)
       employment or consulting contract which is not terminable by AMQUEST or
       its Subsidiaries on 60 days or less notice, (ii) employee bonus, deferred
       compensation, pension, stock bonus or purchase, profit-sharing,
       retirement or stock option plan,  (iii) other employee benefit or welfare
       plan, or (iv) other executory material agreements as defined by the
       instructions to Exhibit 10 under Item 601 of SEC Regulation S-K.  All
       such pension, stock bonus, profit-sharing, retirement, health and welfare
       plans set forth in the AMQUEST Document List are hereinafter referred to
       collectively as the "Plans."  Each of those Plans which purports to be a
       qualified plan under Section 401(a) of the Internal Revenue Code is so
       qualified and nothing has occurred, to the knowledge of AMQUEST and its
       executive officers, whether by action or the failure to act, which could
       reasonably be expected to result in the loss of such qualification.  All
       of the plans which constitute employee pension benefit plans or employee
       welfare plans subject to ERISA have been maintained in compliance in all
       material respects with ERISA.  All material notices, reports and other
       filings required under applicable law to be given or made to or with any
       governmental agency with respect to the plans have been timely filed or
       delivered.  AMQUEST and its executive officers, after due inquiry, have
       no knowledge either of any circumstances which would adversely affect the
       qualification of the plans or their compliance with ERISA, would result
       or have resulted in liability under Title IV of ERISA or of any
       unreported "reportable event" (as such term is defined in Section 4043(b)
       of ERISA) or "prohibited transaction" (as such term is defined in Section
       406 of ERISA and Section 4975(c) of the Internal Revenue 

                                      -26-
<PAGE>
 
       Code) which has occurred during the past five years and which could
       reasonably be expected to result in any material liability of AMQUEST or
       any Subsidiary to the PBGC, the Department of Treasury, the Department of
       Labor or any multiemployer plan. Those plans which are defined benefit
       plans within the meaning of ERISA meet the minimum funding standards set
       forth in the Internal Revenue Code and ERISA and the assets of such plans
       equal or exceed the actual present value of accrued benefits under such
       plans as determined on the basis of the actuarial assumptions contained
       in the plan's most recent actuarial valuation. There are no pending or
       threatened claims (other than claims for benefits in the ordinary course
       and pursuant to domestic relations orders), lawsuits or arbitrations
       which have been asserted or instituted against the plans, any fiduciaries
       thereof with respect to their duties to the plans or the assets of any of
       the trusts under any of the plans which could reasonably be expected to
       result in any material liability of AMQUEST or any of its Subsidiaries to
       the PBGC, the Department of Treasury, the Department of Labor or any
       multiemployer plan.

   (k) Except where the failure to file would not have a AMQUEST Material
       Adverse Effect on AMQUEST and its Subsidiaries, AMQUEST and/or its
       Subsidiaries have duly filed all federal, state, county and local income,
       franchise, bank, excise, real and personal property and other tax returns
       and reports (including, but not limited to, those relating to social
       security, withholding, unemployment insurance, and occupation (sales) and
       use taxes and those filed on a consolidated, combined or unitary basis)
       required to have been filed by AMQUEST or its Subsidiaries up to the date
       hereof.  AMQUEST has made available to BANCFIRST a copy of its Federal
       income tax return for the years 1995 and 1996 and agrees to provide a
       copy of its Federal income tax return for the year 1997 when the same
       becomes available.  All of the foregoing returns are true and correct in
       all material respects, and AMQUEST and its Subsidiaries have paid or,
       prior to the Effective Time, will pay all taxes, interest and penalties
       shown on such returns or reports as being due or (except to the extent
       the same are contested in good faith and, if material, summarized in the
       AMQUEST Disclosure Letter) claimed to be due to any federal, state,
       county, local or other taxing authority, and there is, and at the
       Effective Time will be, no basis for any additional claim or assessment
       which might have a AMQUEST Material Adverse Effect, except for those
       being contested in good faith and summarized in the AMQUEST Disclosure
       Letter.  AMQUEST and its Subsidiaries have paid or made adequate
       provision in its financial statements or its books and records for all
       taxes payable in respect of all periods ending on or before the date
       hereof.  AMQUEST and its Subsidiaries have, and 

                                      -27-
<PAGE>
 
       at the Effective Time will have, no liability for any taxes, interest or
       penalties of any nature whatsoever, except for those taxes which may have
       arisen up to the Effective Time in the ordinary course of business and
       are properly accrued on the books of AMQUEST as of the Effective Time or
       are being contested in good faith and have, if material, been summarized
       in the AMQUEST Disclosure Letter.

   (l) AMQUEST has in effect insurance coverage with reputable insurers which in
       respect of amounts, premiums, types and risks insured, constitutes
       reasonably adequate coverage against all risks customarily insured
       against by bank holding companies comparable in size and operation to
       AMQUEST.

   (m) AMQUEST has not, since March 31, 1998 to the date hereof, (i) sold or
       issued any corporate debt securities or sold, issued, reissued or
       increased its shares of its capital stock; (ii) granted any option for
       the purchase of capital stock other than with respect to existing stock
       option plans; (iii) declared or set aside or paid any dividend or other
       distribution in respect of its capital stock, except as permitted
       pursuant to Section 15(a) hereof or directly or indirectly, purchased,
       redeemed or otherwise acquired any shares of such stock; (iv) incurred
       any obligation or liability (absolute or contingent) except obligations
       or liabilities incurred in the ordinary course of business, or mortgaged,
       pledged or subjected to lien or encumbrance (other than landlord's liens
       and statutory liens for taxes not yet delinquent and banking transactions
       conducted in the ordinary course of business) on any of its material
       assets or properties; (v) discharged or satisfied any material lien or
       encumbrance or paid any material obligation or liability (absolute or
       contingent), other than liabilities included in AMQUEST's financial
       statements as of March 31, 1998, liabilities incurred since the date
       thereof in the ordinary course of business and liabilities incurred in
       carrying out the transactions contemplated by this Merger Agreement; (vi)
       sold, exchanged or otherwise disposed of any material capital assets;
       (vii) made any extraordinary officers' salary increase or wage increase,
       entered into any employment contract with any officer or salaried
       employee or instituted any employee welfare, bonus, stock option,
       profit-sharing, retirement or similar plan or arrangement; (viii)
       suffered any damage, destruction or loss, whether or not covered by
       insurance, that has had a AMQUEST Material Adverse Effect or waived any
       rights of value which, in the aggregate, have had a AMQUEST Material
       Adverse Effect; (ix) entered or agreed to enter into any agreement or
       arrangement granting any preferential right to purchase any of its
       material assets, properties or rights or requiring the consent of any
       party to the transfer and

                                      -28-
<PAGE>
 
       assignment of any such material assets, properties or rights; or (x)
       entered into any other material transaction (other than in the ordinary
       course of business) except as expressly contemplated by this Merger
       Agreement.

   (n) AMQUEST has annexed to the AMQUEST Disclosure Letter a loan schedule
       identifying certain loan agreements, notes and borrowing arrangements
       (the "AMQUEST Loan Schedule") between its Subsidiaries and borrowers of
       its Subsidiaries. Except as specifically noted on the AMQUEST Loan
       Schedule, no Subsidiary was, as of March 31, 1998, a party to any written
       or oral (i) loan agreement, note or borrowing arrangement, other than
       credit card loans and other loans the unpaid balance of which does not
       exceed $250,000 per loan, under the terms of which the obligor is over 60
       days delinquent in payment of principal or interest or, to the best of
       AMQUEST's knowledge, in default of any other provision as of the dates
       shown thereon; (ii) loan agreement, note or borrowing arrangement which
       has been classified as "substandard," "doubtful," "loss," "other loans
       especially mentioned" or any comparable classifications by AMQUEST, a
       Subsidiary or banking regulator; (iii) loan agreement, note, or borrowing
       arrangement, including any loan guaranty, with any director, executive
       officer or ten percent shareholder of AMQUEST or, to the actual knowledge
       of AMQUEST and its executive officers after due inquiry, any person,
       corporation or enterprise controlling, controlled by or under common
       control with any of the foregoing; or, (iv) to the best of the knowledge
       of AMQUEST and its executive officers after due inquiry, loan agreement,
       note or borrowing arrangement in violation of any  law, regulation or
       rule of any governmental authority and which violation could, to the best
       of the knowledge of AMQUEST and its executive officers after due inquiry,
       have a AMQUEST Material Adverse Effect.

   (o) None of the information provided by AMQUEST to BANCFIRST for inclusion in
       the Proxy Statement or related registration statement or any amendment or
       supplement thereto (to the extent so included as so provided) shall
       contain (in the case of information relating to the Proxy Statement, at
       the time it is mailed and in the case of information relating to the
       registration statement, at the time it becomes effective) any untrue
       statement of a material fact or shall omit to state a material fact
       necessary to make the statements contained therein, in light of the
       circumstances in which they are made, not misleading.

                                      -29-
<PAGE>
 
  (p)  Neither AMQUEST nor any Subsidiary is, as of the date hereof, a party to
       any material contract and/or any material credit agreement as obligor,
       maker, issuer or guarantor and which contract or agreement contains
       covenants which make the acquisition of AMQUEST or any Subsidiary by or
       merger with another entity a condition of default or acceleration.

  (q)  Attached hereto as Exhibit A is AMQUEST's Subsidiaries List which sets
       forth the complete legal name of each Subsidiary, a designation of the
       laws under which each Subsidiary is incorporated and the activities
       conducted by each Subsidiary.  Except as set forth in Exhibit A, AMQUEST
       has no subsidiaries.  Each of the Subsidiaries is a corporation, limited
       liability company or similar entity duly organized and validly existing
       in good standing under the laws of the United States or the state of its
       incorporation or organization and has full power and authority (including
       all licenses, franchises, permits and other governmental authorizations
       which are legally required) to engage in the businesses and activities
       now conducted by it and is duly qualified to do business and is in good
       standing in all jurisdictions where the failure to so qualify (together
       with all such failures) would have a AMQUEST Material Adverse Effect.
       Except as may be set forth in Exhibit A, AMQUEST and/or one or more of
       its Subsidiaries owns beneficially and of record all the outstanding
       shares of capital stock of each Subsidiary, which stock is fully paid and
       non-assessable (except as provided in 12 U.S.C. (S)55 and similar state
       laws).  Neither AMQUEST nor any of its Subsidiaries is a party to any
       partnership or joint venture or owns more than 5% of the equity or voting
       interest in any entity or enterprise.

  (r)  No employee of AMQUEST or any of its Subsidiaries is represented, for
       purposes of collective bargaining, by a labor organization of any type.
       AMQUEST is unaware of any efforts during the past five years to unionize
       or organize any employees of AMQUEST or any of its Subsidiaries, and no
       claim related to such employees under the Fair Labor Standards Act,
       National Labor Relations Act, Civil Rights Act of 1964, Walsh-Healy Act,
       Davis Bacon Act, Civil Rights Act of 1866, Age Discrimination in
       Employment Act, Equal Pay Act of 1963, Executive Order No. 11246, Federal
       Unemployment Tax Act, Vietnam Era Veterans Readjustment Act, Occupational
       Safety and Health Act, or any state or local employment related law,
       order, ordinance or regulation, no unfair labor practice, discrimination
       or wage-and-hour claim is pending or, to the best of the knowledge of
       AMQUEST and its executive officers after due inquiry, threatened against
       AMQUEST 

                                      -30-
<PAGE>
 
       or its Subsidiaries, which claim has had or is reasonably likely to have
       a AMQUEST Material Adverse Effect.

   (s) To the actual knowledge of AMQUEST and its executive officers:  (i) with
       respect to any Contaminant, there are no material actions, proceedings or
       investigations pending or threatened before any federal or state
       environmental regulatory body, or before any federal or state court,
       alleging non-compliance with or liability in connection with, by AMQUEST
       or any Subsidiary, CERCLA or any other Environmental Laws; (ii) neither
       AMQUEST nor any Subsidiary is responsible in any material respect under
       any Environmental Law for any Release by any person at or in the vicinity
       of any real property of any Contaminant, including without limitation by
       spilling, leaking, pumping, pouring, emitting, emptying, discharging,
       injecting, escaping, leaching, dumping or disposing of any such
       Contaminant into the environment; (iii) neither AMQUEST nor any
       Subsidiary is responsible for any material costs of any response action
       required by virtue of any Release of any Contaminant into the environment
       including, without limitation, costs arising from investigation, removal
       or remediation of Contaminants, security fencing, alternative water
       supplies, temporary evacuation and housing and other emergency assistance
       undertaken by any environmental regulatory body or any other person; (iv)
       AMQUEST and each Subsidiary is, in all material respects, in compliance
       with all applicable Environmental Laws; and (v) no real property owned or
       used by AMQUEST or any Subsidiary contains any Contaminant including,
       without limitation, any asbestos, PCBs or petroleum products or
       byproducts in any form, the presence, location or condition of which (a)
       is reasonably likely to require remediation or other corrective action
       pursuant to any Environmental Law in any material respect, or (b)
       otherwise would pose any significant health or safety risk unless
       remedial measures were taken.

   (t) The statements made in the AMQUEST Disclosure Letter and any attachments
       thereto shall be deemed to constitute representations and warranties of
       AMQUEST under this Merger Agreement to the same extent as if herein set
       forth in full.  Anything disclosed in the AMQUEST Disclosure Letter or
       the attachments thereto shall be considered to have been disclosed for
       purposes of all representations, warranties and covenants under this
       Merger Agreement.

                                      -31-
<PAGE>
 
15. Action by AMQUEST Pending Effective Time.  AMQUEST agrees that from the date
    of this Merger Agreement until the earlier of the Effective Time or the time
    that this Merger Agreement is terminated, except as stated in AMQUEST's
    Disclosure Letter or except with prior written permission of BANCFIRST,
    which, in any case covered by Section 15(d) hereof, shall not be
    unreasonably withheld:

    (a) Beginning with the second quarter of 1998 and for each succeeding
        calendar quarter thereafter prior to the calendar quarter in which the
        Effective Time shall occur, AMQUEST

        (i)   will not declare or pay any dividends or make any distributions on
              shares of AMQUEST Common, except cash dividends of (A) $.04 per
              share for the second quarter of 1998 and (B) of not more than $.04
              per share for each quarter subsequent to the second quarter of
              1998; and

        (ii)  except as hereinbelow provided, will not declare or pay any
              dividends or make any distributions in any amount on AMQUEST
              Common in the quarter in which the Effective Time shall occur and
              in which the shareholders of AMQUEST Common are entitled to
              receive regular quarterly dividends on the shares of BANCFIRST
              Common into which the shares of AMQUEST Common have been
              converted. It is the intent of this part (ii) to provide that the
              holders of AMQUEST Common will receive either the payment of cash
              dividends on their shares of AMQUEST Common or the payment of cash
              dividends as the holders of shares of BANCFIRST Common received in
              exchange for the shares of AMQUEST Common for the calendar quarter
              during which the Effective Time shall occur, but will not receive
              and will not become entitled to receive for the same calendar
              quarter both the payment of a cash dividend as shareholders of
              AMQUEST and the payment of a cash dividend as the holders of the
              shares of BANCFIRST Common received in exchange for the shares of
              AMQUEST Common. In the event that AMQUEST does not declare and pay
              cash dividends on its AMQUEST Common in a particular calendar
              quarter because of AMQUEST's reasonable expectation that the
              Effective Time would occur in said calendar quarter and the
              Effective Time does not in fact occur effective in said calendar
              quarter, then, as a result thereof, AMQUEST shall be entitled to
              declare and pay a cash dividend 

                                      -32-
<PAGE>
 
              (within the limitations of this Section 15) on said shares of
              AMQUEST Common for said calendar quarter as soon as reasonably
              practicable.

       The declaration of any dividends within the limitations of this paragraph
       shall remain within the discretion of the Board of Directors of AMQUEST.

   (b) AMQUEST will not issue, sell or grant any warrant, option, phantom stock
       option, stock appreciation right or commitment of any kind for or related
       to or acquire for value any shares of its capital stock or otherwise
       effect any change in connection with its equity capitalization except as
       related to the outstanding stock options which have been granted related
       to the purchase of not more than 154,902 shares of AMQUEST Common.

   (c) Except as otherwise set forth in or contemplated by this Merger
       Agreement, AMQUEST will carry on its businesses in substantially the same
       manner as heretofore, keep in full force and effect insurance comparable
       in amount and scope of coverage to that now maintained by it and use its
       reasonable best efforts to maintain and preserve its business
       organization intact.

   (d) Neither AMQUEST nor any Subsidiary will (i) enter into any new line of
       business or incur or agree to incur any obligation or liability except
       liabilities and obligations (including corporate debt issuances) incurred
       in the ordinary course of business, except as may be directed by any
       regulatory agency; (ii) except as may be directed by any regulatory
       agency, change its or its Subsidiaries' lending, investment, liability
       management and other material banking policies in any material respect;
       (iii) except in the ordinary course of business and consistent with prior
       practice, grant any general or uniform increase in the rates of pay of
       employees; (iv) establish any new employee benefit plan or amend any
       existing plan (except as required by law) so as to increase by any
       significant amount the benefits payable thereunder; (v) sell any assets
       except in the ordinary course of business and in an aggregate amount not
       exceeding $50,000; (vi) incur or commit to any capital expenditures other
       than in the ordinary course of business (which will in no event include
       the establishment of new branches or any other facilities or any capital
       expenditures in excess of $100,000 for any individual project for any
       purpose); or (vii) merge into, consolidate with or permit any other
       corporation to be merged or consolidated with it or any Subsidiary or
       acquire outside of the ordinary course of business part of or all the
       assets or stock of any other corporation or person.

                                      -33-
<PAGE>
 
    (e) AMQUEST will not change its or its Subsidiaries' methods of accounting
        in effect at December 31, 1997, except as required by changes in
        generally accepted accounting principles as concurred in by Arthur
        Andersen, L.L.P. or change any of its methods of reporting income and
        deductions for Federal income tax purposes from those employed in the
        preparation of AMQUEST's Federal income tax returns for the taxable
        years ending December 31, 1996 and 1997, except as required by changes
        in law or regulation.

    (f) To the extent permitted by law, AMQUEST will afford BANCFIRST, its
        officers and other authorized representatives, such access to all books,
        records, bank examination reports, tax returns, leases, contracts and
        documents of AMQUEST and its Subsidiaries and will furnish to BANCFIRST
        such information with respect to the assets and business of AMQUEST and
        its Subsidiaries as BANCFIRST may from time to time reasonably request
        in connection with this Merger Agreement and the transactions
        contemplated hereby.

    (g) AMQUEST will promptly advise BANCFIRST in writing of all material
        corporate actions taken by the directors and shareholders of AMQUEST,
        furnish BANCFIRST with copies of all monthly and other interim financial
        statements of AMQUEST as they become available, and keep BANCFIRST fully
        informed concerning all trends and developments which in the opinion of
        AMQUEST may have a AMQUEST Material Adverse Effect.

    (h) AMQUEST will notify BANCFIRST prior to the origination of any new loan
        or an advance on an existing loan of $1,000,000 or greater.

16. Action by BANCFIRST Pending Effective Time.  BANCFIRST agrees that from the
    date of this Agreement until the earlier of the Effective Time, or the time
    that this Merger Agreement is terminated, except as stated in BANCFIRST's
    Disclosure Letter or except with prior written permission of AMQUEST, which,
    in any case covered by Section 16(d) hereof shall not be unreasonably
    withheld:

    (a) BANCFIRST will not adopt or implement any amendment to its Certificate
        of Incorporation, except for the purpose of increasing authorized shares
        of BANCFIRST Common, or any plan of consolidation, merger or
        reorganization which would affect in 

                                      -34-
<PAGE>
 
        any manner the terms and provisions of the shares of BANCFIRST Common or
        the rights of the holders of such shares or reclassify any of the
        BANCFIRST Common.

    (b) Except as otherwise set forth in or contemplated by this Merger
        Agreement, BANCFIRST will carry on its businesses in substantially the
        same manner as heretofore, keep in full force and effect insurance
        comparable in amount and scope of coverage to that now maintained by it
        and use its reasonable best efforts to maintain and preserve its
        business organization intact.

    (c) BANCFIRST will not change its methods of accounting in effect at
        December 31, 1997, except as required by changes in generally accepted
        accounting principles as concurred in with Coopers & Lybrand, L.L.P., 
        its independent auditors, or change any of its methods of reporting
        income and deductions for Federal income tax purposes from those
        employed in the preparation of the Federal income tax returns of
        BANCFIRST for the taxable years ending December 31, 1996 and 1997,
        except as required by changes in law or regulation.

    (d) BANCFIRST will not, and will cause its subsidiaries not to, make or
        agree to make any acquisition, or take any other action, that adversely
        affects its ability to consummate the transactions contemplated by this
        Merger Agreement and will otherwise continue to conduct its business
        operations and will cause the operations of its subsidiaries to be
        conducted in a manner consistent with past operating practices. For
        purposes of this provision, it is understood and agreed that any
        acquisition, merger, consolidation or reorganization which involves the
        creation of not more than $3 million in intangible assets on the books
        of BANCFIRST and which involves the acquisition of not more than $100
        million in total assets shall be deemed to be consistent with past
        operating practices.

    (e) To the extent permitted by law, BANCFIRST will afford AMQUEST, its
        officers and other authorized representatives, such access to all books,
        records, bank examination reports, tax returns, leases, contracts and
        documents of BANCFIRST and its Subsidiaries and will furnish to AMQUEST
        such information with respect to the assets and business of BANCFIRST
        and its Subsidiaries as AMQUEST may from time to time reasonably request
        in connection with this Merger Agreement and the transactions
        contemplated hereby.

                                      -35-
<PAGE>
 
    (f) BANCFIRST will promptly advise AMQUEST in writing of all material
        corporate actions taken by the directors and shareholders of BANCFIRST,
        furnish AMQUEST with copies of all monthly and other interim financial
        statements of BANCFIRST as they become available, and keep AMQUEST fully
        informed concerning all trends and developments which in the opinion of
        BANCFIRST may have a BANCFIRST Material Adverse Effect.

17. Conditions to Obligations of BANCFIRST.  The obligations of BANCFIRST to
    effect the Merger are subject, unless waived by BANCFIRST, to the
    satisfaction of the following conditions on or prior to the Effective Time:

    (a) There shall not have been any change in the consolidated financial
        condition, aggregate net assets, shareholders' equity, business or
        operating results of AMQUEST and its Subsidiaries, taken as a whole,
        from March 31, 1998 to the Effective Time that has had a AMQUEST
        Material Adverse Effect.

    (b) AMQUEST shall not have paid cash dividends from March 31, 1998 to the
        Effective Time except as permitted under this Merger Agreement.

    (c) All representations by AMQUEST contained in this Merger Agreement shall
        be true at, or as of, the Effective Time as though such representations
        were made at and as of said date, except for (i) changes contemplated by
        the Merger Agreement, (ii) representations as of a specified time other
        than the Effective Time, which shall be true at such specified time
        (provided, however, that the representation of AMQUEST contained in
        Section 14(e) shall be true in all material respects as applied to the
        Balance Sheet of AMQUEST included in the most recently available
        quarterly or annual report to AMQUEST shareholders and/or AMQUEST's most
        recent publicly filed report to the Board prior to the Effective Time
        and the allowance for possible loan losses included therein, as though
        each reference to "March 31, 1998" in such Section were a reference to
        the last day of the calendar quarter of such report or form), and (iii)
        inaccuracies or breaches which do not, individually or in the aggregate,
        have a AMQUEST Material Adverse Effect.
 
    (d) BANCFIRST shall have received the opinion of legal counsel for AMQUEST,
        dated as of the Effective Time, substantially to the effect set forth in
        Exhibit C hereto, together with a copy of the Certificate of
        Incorporation, as amended, of AMQUEST certified by the Secretary of
        State of Oklahoma and Certificates of Good Standing dated as of a date
        not

                                      -36-
<PAGE>
 
       more than 20 days prior to the Effective Time from the Secretary of State
       of the State of Oklahoma or the OCC, as appropriate, for each Bank.

   (e) AMQUEST shall have fulfilled and satisfied, in all material respects, all
       agreements and conditions required by this Merger Agreement to be
       fulfilled and satisfied by it at or prior to the Effective Time.

   (f) As of the close of the month immediately preceding the Effective Time,
       and at the Effective Time, AMQUEST will have a minimum stockholders'
       equity determined in accordance with generally accepted accounting
       principles as shown on the following table:
 
                August 31, 1998       $54,160,882
                September 30, 1998    $54,650,741
                October 31, 1998      $55,140,600
                November 30, 1998     $55,630,459

   The above amounts are exclusive of:

        (i)   any increase in stockholders' equity as a result of exercise of
              stock options;

        (ii)  additional compensation, if any, offered by BANCFIRST prior to
              closing to employees of AMQUEST in order to induce them to remain
              with BANCFIRST, subsequent to the Effective Time;

        (iii) any other expenses or adjustments otherwise mutually agreed by the
              parties, including expenses relating to premises;

        (iv)  the change in unrealized gains or losses subsequent to March 31,
              1998, with respect to available for sale securities or any
              realized gains on sales of securities. Realized losses on sales of
              securities shall be excluded for transactions approved by
              BANCFIRST;and

        (v)   any loss not exceeding $150,000 incurred by AmQuest in the sale of
              its Cache, Oklahoma, branch.

                                      -37-
<PAGE>
 
    In the event that the minimum stockholders' equity is below the specified
    amount on the respective date, the total number of BANCFIRST shares to be
    issued of 2,625,000 shall be reduced by an amount equal to the deficiency
    divided by $40, and the exchange ratio shall be adjusted accordingly.

    (g)  The reserve for loan losses of AMQUEST shall be not less than .90% of
         gross loans.

    (h)  The total number of shares of AMQUEST Common issued and outstanding
         (not including treasury shares held by AMQUEST), including the total
         number of shares of AMQUEST Common related to outstanding and
         unexercised options related to AMQUEST Common, shall not be more than
         3,315,653 shares.

    (i)  AMQUEST shall have furnished BANCFIRST certificates, signed on its
         behalf by its Chairman or President and its Secretary or an Assistant
         Secretary and dated as of the Effective Time, certifying as to the form
         of and adoption of resolutions of its Board and shareholders approving
         the Merger Agreement and the Merger, respectively, and to the effect
         that the conditions described in Paragraphs (a), (b), (c), (f), (g),
         and (h) of this Section 17 have been fully satisfied.

18. Conditions to Obligations of AMQUEST.  The obligations of AMQUEST to effect
    the Merger are subject, unless waived by AMQUEST, to the satisfaction on or
    prior to the Effective Time of the following conditions:

    (a)  There shall not have been any change in the consolidated financial
         condition, aggregate net assets, shareholders' equity, business, or
         operating results of BANCFIRST and its subsidiaries, taken as a whole,
         from March 31, 1998 to the Effective Time that has had a BANCFIRST
         Material Adverse Effect.

    (b)  All representations by BANCFIRST contained in this Merger Agreement
         shall be true at, or as of, the Effective Time as though such
         representations were made at and as of said date, except for changes
         (i) contemplated by this Merger Agreement, (ii) representations as of a
         specified time other than the Effective Time, which shall be true in
         all material respects at such specified time (provided, however, that
         the representation of BANCFIRST contained in Section 13(e) shall be
         true in all material respects as applied to the Balance Sheet of
         BANCFIRST included in the most recently available quarterly or 

                                      -38-
<PAGE>
 
         annual report to BANCFIRST's shareholders and/or BANCFIRST's most
         recently filed report to the SEC on Form 10-Q or Form 10-K prior to the
         Effective Time and the reserve for possible loan and lease losses
         included therein, as though each reference to "March 31, 1998" in such
         Section were a reference to the last day of the calendar quarter of
         such report or form), and (iii) inaccuracies or breaches which do not,
         individually or in the aggregate, have a BANCFIRST Material Adverse
         Effect.

    (c)  AMQUEST shall have received the opinion of counsel for BANCFIRST, (i)
         on and dated the date on which the registration statement described in
         Section 10(d) of this Merger Agreement shall have become effective as
         described in Section 20(b) of this Merger Agreement substantially to
         the effect of paragraphs numbered 5, 6 and 7 of Exhibit D hereto and
         (ii) on and dated as of the Effective Time substantially to the effect
         set forth in Exhibit D hereto, together with a copy of the Certificate
         of Incorporation of BANCFIRST certified by the Secretary of State of
         the State of Oklahoma and, as AMQUEST shall reasonably require,
         Certificate of Good Standing of BANCFIRST dated as of a date not more
         than 20 days prior to the day of the Effective Time from the Secretary
         of State of the State of Oklahoma, and copies of the By-laws of
         BANCFIRST.

    (d)  BANCFIRST shall have fulfilled and satisfied, in all material respects,
         all agreements and conditions required by this Merger Agreement to be
         fulfilled and satisfied by it at or prior to the Effective Time.

    (e)  BANCFIRST shall have furnished AMQUEST a certificate, signed on its
         behalf by its Chairman, President, Senior Executive Vice President or
         an Executive Vice President and by its Secretary or Assistant Secretary
         and dated as of the Effective Time certifying as to the form of and
         adoption of the resolution of its Board and shareholders approving the
         Merger Agreement and the Merger, and to the effect that the conditions
         described in Paragraphs (a), (b), (d), and (e) of this Section 18 have
         been fully satisfied as to it.

    (f)  As of the close of the most recent calendar quarter (or if the
         Effective Time shall occur within 20 days following the close of a
         calendar quarter, then as of the close of the next preceding calendar
         quarter) cumulative earnings per share of BANCFIRST Common reported by
         BANCFIRST for calendar quarters beginning with the second quarter of
         1998 through the most recent calendar quarter as defined above, shall
         be greater than or equal to the amount calculated by multiplying (x)
         $.62 by (y) the number of full calendar 

                                      -39-
<PAGE>
 
         quarters which have passed since March 31, 1998 and for which earnings
         per share of BANCFIRST Common have been reported as of such date, times
         (z) 0.9. As used in this Section, "reported" means reported on
         BANCFIRST's quarterly financial statements prepared in accordance with
         generally accepted accounting principles applied on a basis consistent
         with BANCFIRST's financial statements for the year ended December 31,
         1997, as included in BANCFIRST's report to the SEC on Form 10-K.

19. Conditions to Obligations of All Parties.  In addition to the provisions of
    Sections 17 and 18 hereof, the obligations of BANCFIRST and AMQUEST to
    effect the Merger shall be subject to the satisfaction of the following
    conditions on or prior to the Effective Time:

    (a)  The parties hereto shall have received all necessary approvals of
         governmental agencies and authorities of the transactions contemplated
         by this Merger Agreement and each of such approvals shall remain in
         full force and effect at the Effective Time. BANCFIRST shall notify
         AMQUEST promptly upon receipt of all necessary governmental approvals.
         At the Effective Time, (i) no party hereto shall be subject to any
         order, decree or injunction of a court or governmental agency of
         competent jurisdiction which enjoins or prohibits the consummation of
         the Merger; and (ii) no statute, rule, regulation, order, injunction or
         decree shall have been enacted, entered, promulgated or enforced by any
         governmental authority which prohibits or makes illegal consummation of
         the Merger.

    (b)  The registration statement required to be filed by BANCFIRST pursuant
         to Section 10(d) of this Merger Agreement shall have become effective
         by an order of the SEC, the shares of BANCFIRST Common to be exchanged
         in the Merger shall have been qualified or exempted under all
         applicable state securities laws, and there shall have been no stop
         order issued and in effect or threatened by the SEC that suspends or
         would suspend the effectiveness of the registration statement, and no
         proceeding by the SEC shall have been commenced, pending or overtly
         threatened for such purpose and the BANCFIRST Common to be issued in
         the Merger will be authorized for trading.

    (c)  This Merger Agreement shall have been duly approved and adopted by the
         requisite affirmative vote of the shareholders of AMQUEST and
         BANCFIRST.

    (d)  Crowe and Dunlevy shall have issued its written opinion, dated as of
         the date of the Effective Time, satisfactory to AMQUEST and BANCFIRST,
         respectively, substantially 

                                      -40-
<PAGE>
 
         to the effect set forth in clauses (a) through (e) of Section 12 of
         this Merger Agreement and there shall exist as of, at or immediately
         prior to the Effective Time, no facts or circumstances which would
         render such opinion inapplicable in any respect to the transactions to
         be consummated hereunder.

    (e)  The aggregate of (i) the fractional share interests of BANCFIRST Common
         to be paid in cash pursuant to Section 7(c), and (ii) the shares of
         BANCFIRST Common to which holders of AMQUEST Common would have been
         entitled as of the Effective Time but who, as of the Effective Time,
         have taken steps to perfect their rights as dissenting shareholders
         pursuant to the provisions of applicable law, shall not be more than
         10% of the maximum aggregate number of shares of BANCFIRST Common which
         could be issued as a result of the Merger, provided, however, that
         "tainted" shares held as treasury stock by AMQUEST shall be regarded as
         dissenting shares for purposes of such computation.

    (f)  The registration statement filed by BANCFIRST with the SEC registering
         the shares of BANCFIRST Common reserved for issuance pursuant to the
         exercise of options on BANCFIRST Common pursuant to the AMQUEST Options
         shall have become effective pursuant to rules and regulations of the
         SEC and shall have been qualified or exempted under all applicable
         state securities laws, and there shall have been no stop order issued
         and in effect or threatened by the SEC that suspends or would suspend
         the effectiveness of such registration and no proceeding by the SEC
         shall have been commenced, pending or overtly threatened for such
         purpose.

    (g)  The Merger shall qualify as a pooling of interests in accordance with
         APB 16 and all rules, regulations and policies of the SEC.

20. Indemnification.

    (a)  In the event of any threatened or actual claim, action, suit,
         proceeding or investigation, whether formal or informal and whether
         civil, administrative or criminal, including, without limitation, any
         such claim, action, suit, proceeding or investigation pursuant to which
         any person who is now, or has been at any time prior to the date
         hereof, or who becomes prior to the Effective Time, a director,
         officer, employee, fiduciary or agent of AMQUEST or any of its
         Subsidiaries (the "Indemnified Parties") is, or is threatened to be,

                                      -41-
<PAGE>
 
         made a party or a witness, based in whole or in part on, or arising in
         whole or in part out of, or pertaining to, this Merger Agreement or any
         of the transactions contemplated hereby (a "Merger Related Event"),
         whether in any case asserted or arising before or after the Effective
         Time, the parties hereto agree to cooperate and use their reasonable
         best efforts to defend against and respond to such claim, action, suit,
         proceedings or investigation. With respect to any Merger Related Event,
         and conditioned upon the Merger becoming effective, BANCFIRST shall
         indemnify, defend and hold harmless, as and to the fullest extent
         permitted by applicable law, each Indemnified Party against any and all
         losses, claims, damages, liabilities, costs, expenses (including
         attorneys' fees and expenses), judgments and fines, and amounts paid in
         settlement, in connection with any such threatened or actual claim,
         action, suit, proceedings or investigation; provided, however, that
         BANCFIRST shall not be liable for any settlement effected without its
         prior written consent (which consent shall not be unreasonably
         withheld). In the event of any such threatened or actual claim, action,
         suit, proceedings or investigation (whether asserted or arising before
         or after the Effective Time), (i) BANCFIRST shall pay expenses
         (including attorney's fees and expenses) in advance of the final
         disposition of any claim, suit, proceedings or investigation to each
         Indemnified Party to the fullest extent permitted by applicable law,
         and (ii) BANCFIRST shall use its reasonable best efforts to vigorously
         defend any such matter; provided, however, that BANCFIRST's obligations
         as herein set forth shall not apply to any losses, claims, damages,
         liabilities, costs, expenses, judgments, fines and amounts paid in
         settlement by any Indemnified Party involving the fraud, bad faith
         and/or reckless disregard of such Indemnified Party or related to any
         threatened or actual claim, action, suit, proceedings or investigation
         brought by BANCFIRST against any Indemnified Party. Any Indemnified
         Party wishing to claim indemnification and defense under this Section
         20(a) shall, upon the earlier to occur of (A) receiving actual notice
         of any such claim, action, suit, proceeding or investigation, (B)
         otherwise learning of such claim, action, suit, proceeding or
         investigation or (C) receiving other information which would give a
         reasonably prudent person reason to believe that such a claim, action,
         suit, proceeding or investigation had or might be brought, notify
         BANCFIRST thereof as soon as reasonably practicable thereafter.
         BANCFIRST's obligations pursuant to this Section 20(a) are conditioned
         upon (A) BANCFIRST being given the right to control and direct the
         investigation, defense and/or settlement of each such matter; provided,
         however, that BANCFIRST will endeavor to consult with the Indemnified
         Party and to take the views of such Indemnified Party into
         consideration in effecting any settlement and BANCFIRST will not enter
         into any such settlement without the consent of the 

                                      -42-
<PAGE>
 
         Indemnified Party (which consent shall not be unreasonably withheld)
         unless the settlement results in the complete release of the
         Indemnified Party from any further liability with respect to the Merger
         Related Event aspects of any such claim, (B) the Indemnified Party
         having reasonably cooperated with BANCFIRST in connection therewith,
         and (C) the BANCFIRST being given prompt written notice of any such
         claim, action, suit, proceeding or investigation; provided, however,
         that the failure to so notify shall not affect the obligations of
         BANCFIRST unless BANCFIRST is prejudiced thereby.

    (b)  To the extent not prohibited by applicable law, BANCFIRST shall insure
         that all rights to indemnification and defense and all limitations of
         liability existing in favor of the Indemnified Parties as provided in
         AMQUEST's Certificate of Incorporation and By-laws or similar governing
         documents of any of its Subsidiaries or indemnification agreements, as
         in effect as of December 31, 1997, or as otherwise provided for or
         allowed under applicable law as in effect as of the date hereof or as
         such law is amended at a time prior to the Effective Time, with respect
         to claims or liabilities arising from facts or events existing or
         occurring prior to the Effective Time, shall survive the Merger and
         shall continue in full force and effect, without any amendment thereto,
         for a period of six (6) years from the Effective Time; provided,
         however, that all rights to indemnification in respect of any claim
         asserted or made within such period shall continue until the final
         disposition of such claim.

    (c)  In connection with any obligation of BANCFIRST to indemnify any
         Indemnified Party pursuant to Section 20(a) or (b), any determination
         required to be made with respect to whether an Indemnified Party's
         conduct complies with the standards set forth in Section 20(a), above,
         or under Oklahoma law and the Certificate of Incorporation or By-Laws
         of AMQUEST shall be made by independent counsel (which shall not be
         counsel that provides material services to BANCFIRST) selected by
         BANCFIRST and reasonably acceptable to the Indemnified Party; and
         provided, further, that, in making such determination, BANCFIRST shall
         have the burden to demonstrate that the Indemnified Party's conduct
         failed to comply with such standard.

    (d)  From and after the Effective Time, persons who, immediately prior to
         the Effective Time, served as the directors, officers and employees of
         AMQUEST and its Subsidiaries, who, following the Effective Time,
         continue as directors, officers and/or employees of the Surviving
         Corporation or one of its subsidiaries, shall have indemnification and
         defense 

                                      -43-
<PAGE>
 
         rights having prospective application only, except, however, for the
         indemnification and defense rights set forth in paragraphs (a), (b) and
         (c) of this Section 20. These prospective indemnification and defense
         rights shall consist of (i) such rights to which directors, officers
         and employees are entitled under the provisions of the Certificate of
         Incorporation, By-laws or similar governing documents of the Surviving
         Corporation and its subsidiaries, as applicable, as in effect from time
         to time after the Effective Time, as applicable, and provisions of
         applicable law as in effect from time to time after the Effective Time
         and (ii) those indemnification and defense rights set forth in
         agreements, if any, between BANCFIRST and the directors and executive
         officers of the Surviving Corporation and its Subsidiaries. Such
         agreements, if any, which shall be executed as soon as practicable
         following the Effective Time, shall provide certain indemnification and
         defense rights that are comparable to those provided to directors,
         officers and employees of BANCFIRST and its subsidiaries generally, but
         which rights may be greater or lesser than the indemnification and
         defense rights available in clause (i) above.

    (e)  The obligations of BANCFIRST provided under paragraphs (a), (b) and (c)
         of this Section 20 are intended to benefit, and be enforceable against
         BANCFIRST directly by the Indemnified Parties, and shall be binding on
         all respective successors and permitted assigns of BANCFIRST.

    (f)  In the event BANCFIRST or any of its successors or assigns (i)
         consolidates with or merges into any other person and shall not be the
         continuing or surviving corporation or entity of such consolidation or
         merger, or (ii) transfers or conveys all or substantially all of its
         properties and assets to any person, then, and in each such case,
         proper provision shall be made so that the successors and assigns of
         BANCFIRST as the case may be, assume the obligations set forth in this
         Section 20.

    (g)  The provisions of this Section 20 are intended for the benefit of, and
         shall be enforceable by, each Indemnified Party and his or her heirs
         and representatives. BANCFIRST shall pay all reasonable costs,
         including attorneys fees, that may be incurred by any Indemnified Party
         in successfully enforcing the indemnity and other obligations provided
         for in this Section 20. The rights of each Indemnified Party hereunder
         shall be in addition to any other rights such Indemnified Party may
         have under applicable law.

                                      -44-
<PAGE>
 
21. Non-Survival of Representations and Warranties. The respective
    representations and warranties of AMQUEST and BANCFIRST contained in this
    Merger Agreement shall not survive the Effective Time.

22. Governing Law.  This Merger Agreement shall be construed and interpreted
    according to the applicable laws of the State of Oklahoma.

23. Assignment.  This Merger Agreement and all of the provisions hereof shall be
    binding upon and inure to the benefit of the parties hereto and their
    respective successors and permitted assigns, but neither this Merger
    Agreement nor any of the rights, interests, or obligations hereunder shall
    be assigned by any of the parties hereto without the prior written consent
    of the other parties.

24. Satisfaction of Conditions; Termination.

    (a)  BANCFIRST agrees to use its reasonable best efforts to obtain
         satisfaction of the conditions of this Merger Agreement insofar as they
         relate to BANCFIRST, and AMQUEST agrees to use its reasonable best
         efforts, subject to the fiduciary duties of the Board of Directors of
         AMQUEST, to obtain the satisfaction of the conditions of this Merger
         Agreement insofar as they relate to AMQUEST, in each case, as soon as
         possible.

    (b)  This Merger Agreement may be terminated at any time prior to the
         Effective Time, whether before or after approval of the Merger by the
         shareholders of BANCFIRST or by AMQUEST's shareholders, upon the
         occurrence of any of the following by written notice from BANCFIRST to
         AMQUEST (authorized by the Board of Directors or executive officers of
         BANCFIRST), or by written notice from AMQUEST to BANCFIRST (authorized
         by the Board of Directors of AMQUEST), as the case may be:

         (i)   If any material condition to the obligations of BANCFIRST set
               forth in Section 17 or 19 is not substantially satisfied at the
               time or times contemplated thereby and such condition is not
               waived by BANCFIRST or if any material condition to the
               obligations of AMQUEST as set forth in Section 18 or 19 is not
               substantially satisfied at the time or times contemplated thereby
               and such condition is not waived by AMQUEST. Each party's right
               to terminate under this Section 24 (b)(i) shall relate only to
               conditions to that party's obligations;

                                      -45-
<PAGE>
 
         (ii)  In the event of a material breach by the other of any
               representation, warranty, condition or agreement contained in
               this Merger Agreement that is not cured within 30 days of the
               time that written notice of such breach is received by such other
               party from the party giving notice; or

         (iii) If the Merger shall not have been consummated on or before
               November 30, 1998.

    (c)  In the event that BANCFIRST's investigation and review of AMQUEST
         discloses matters which BANCFIRST in good faith believes to be either
         (i) inconsistent in any material respect with any of the
         representations and warranties of AMQUEST contained in this Merger
         Agreement or (ii), in the reasonable judgment of the Board of Directors
         of BANCFIRST, to be either (x) of such significance as to materially
         and adversely affect the financial condition or the results of
         operations of AMQUEST and its Subsidiaries on a consolidated basis or
         (y) deviate materially and adversely from AMQUEST's financial
         statements for the three months ended March 31, 1998, BANCFIRST may
         elect to terminate this Merger Agreement by giving written notice of
         termination to AMQUEST within twenty days following the date of this
         Merger Agreement.

    (d)  In the event that AMQUEST's investigation and review of BANCFIRST
         discloses matters which AMQUEST in good faith believes to be either (i)
         inconsistent in any material respect with any of the representations
         and warranties of BANCFIRST contained in this Merger Agreement or (ii),
         in the reasonable judgment of the Board of Directors of AMQUEST, to be
         either (x) of such significance as to materially and adversely affect
         the financial condition or the results of operations of BANCFIRST and
         its Subsidiaries on a consolidated basis or (y) deviate materially and
         adversely from BANCFIRST's financial statements for the three months
         ended March 31, 1998, AMQUEST may elect to terminate this Merger
         Agreement by giving written notice of termination to BANCFIRST within
         twenty days following the date of this Merger Agreement.

    (e)  This Merger Agreement may be terminated and abandoned (whether before
         or after approval of the Merger by the shareholders of BANCFIRST or by
         AMQUEST's shareholders) by mutual written consent of AMQUEST and
         BANCFIRST authorized by the respective Boards of Directors of AMQUEST
         and BANCFIRST.

                                      -46-
<PAGE>
 
    (f)  AMQUEST shall have the right to terminate this Merger Agreement in the
         event that the shareholders' equity of AMQUEST as specified in Section
         17(f) as of the end of the month immediately preceding the Effective
         Time is lower than the specified shareholders' equity figure for such
         date by an amount in excess of 10% of such figure.

    (g)  In the event of termination of this Merger Agreement (i) caused
         otherwise than by a willful breach of this Merger Agreement by any of
         the parties hereto or (ii) pursuant to Section 24(c), Section 24(d), or
         Section 24(e), (A) this Merger Agreement shall cease and terminate, the
         acquisition of AMQUEST as provided herein shall not be consummated, and
         neither BANCFIRST, nor AMQUEST shall have any liability to any other
         party under this Merger Agreement of any nature whatever, except for
         BANCFIRST's obligations related to the printing of the proxy
         solicitation materials, including any liability for damages, and (B)
         BANCFIRST and AMQUEST each shall pay its own fees and expenses incident
         to the negotiation, preparation and execution of this Merger Agreement,
         the respective shareholders' meetings and actions of the parties and
         all other acts incidental to, contemplated by or in pursuance of the
         transactions contemplated by this Merger Agreement, including fees and
         expenses of their respective counsel, accountants and other experts and
         advisors. The duties of the parties with respect to confidential
         information as set forth in Section 10(f) shall survive any termination
         of this Merger Agreement.

    (h)  If termination of this Merger Agreement shall be judicially determined
         to have been caused by willful breach of this Merger Agreement, then,
         in addition to other remedies at law or equity for breach of this
         Merger Agreement, the party so found to have willfully breached this
         Merger Agreement shall indemnify the other parties for their respective
         costs, fees and expenses of their counsel, accountants and other
         experts and advisors as well as fees and expenses incident to
         negotiation, preparation and execution of this Merger Agreement and
         related documentation and their shareholders' meetings and consents.

25. Expenses.  Except as provide in Section 24, each party hereto will bear all
    its own costs, charges and expenses in connection with the negotiation and
    preparation of, and transactions contemplated by, this Agreement, including,
    but not limited to, fees of their respective attorneys, investment advisers
    and accountants.  With respect to AMQUEST all such fees and costs shall be
    paid in full or accrued as a liability on AMQUEST's books not later than the
    end of the month immediately preceding the Effective Time.

                                      -47-
<PAGE>
 
26. Waivers; Amendments. Any of the provisions of this Merger Agreement may be
    waived in writing at any time by the party which is, or the shareholders of
    which are, entitled to the benefit thereof, provided, however, such waiver,
    if material to AMQUEST or its shareholders, may be made only following due
    authorization by the Board of Directors of AMQUEST. This Merger Agreement
    may be amended or modified in whole or in part by an agreement in writing
    executed in the same manner (but not necessarily by the same persons) as
    this Merger Agreement and which makes reference to this Merger Agreement;
    provided, however, such amendment or modification may be made only following
    due authorization by the respective Boards of Directors of AMQUEST and
    BANCFIRST; provided, further, however, that after a favorable vote by the
    shareholders of AMQUEST any such action shall be taken by AMQUEST only if,
    in the opinion of its Board of Directors, such amendment or modification
    will not have any material adverse effect on the benefits intended under
    this Merger Agreement for the shareholders of AMQUEST, and will not require
    resolicitation of any proxies from such shareholders.

27. Entire Agreement.  Subject to the exceptions noted in the next following
    sentence, this Merger Agreement supersedes any other agreement, whether
    written or oral, that may have been made or entered into by AMQUEST and
    BANCFIRST or by any officer or officers of such parties relating to the
    acquisition of the business or the capital stock of AMQUEST and/or its
    Subsidiaries by BANCFIRST.  Except for the BANCFIRST Disclosure Letter and
    any attachments thereto, the AMQUEST Disclosure Letter and any attachments
    thereto, and the Confidentiality Agreement, this Merger Agreement and the
    exhibits hereto constitute the entire agreement by the parties, and there
    are no agreements or commitments except as set forth herein and therein.

28. Captions; Counterparts.  The captions in this Merger Agreement are for
    convenience only and shall not be considered a part of or affect the
    construction or interpretation of any provision of this Merger Agreement.
    This Merger Agreement may be executed in several counterparts, each of which
    shall constitute one and the same instrument.

29. Notices.  All notices and other communications hereunder may be made by
    mail, hand-delivery or by courier service. If notices and other
    communications are made by nationally recognized overnight courier service
    for overnight delivery, such notice shall be deemed to have been given one
    business day after being forwarded to such a nationally recognized overnight
    courier service for overnight delivery. All notices and other communications
    hereunder given to any

                                      -48-
<PAGE>
 
    party shall be communicated to the remaining party to this Merger Agreement
    by mail or by hand-delivery in the same manner as herein provided.

(a) If to BANCFIRST, to:  BancFirst Corporation
                          P.O. Box 26788
                          Oklahoma City, Oklahoma 73126
                          Attn:  David Rainbolt
                          Phone:  (405) 270-1010
                          Fax:  (405) 270-1089

    With a copy to:       Craig Ledgerwood & Bauman
                          401 West Main St., Suite 400
                          Norman, Oklahoma 73069
                          Attn:  Marion C. Bauman
                          Phone:  (405) 329-1001
                          Fax:  (405) 329-5520


(b) If to AMQUEST, to:    AmQuest Financial Corp.
                          P.O. Box 2139
                          Duncan, OK 73534
                          Attn:  John Hugon
                          Phone:  (580) 255-4100
                          Fax:  (580) 255-5610

    With a copy to:       Crowe and Dunlevy
                          1800 Mid America Tower
                          Oklahoma City, OK 73102
                          Attn:  Michael M. Stuart
                          Phone:  (405) 235-7747
                          Fax:  (405) 272-5231

                                      -49-
<PAGE>
 
IN WITNESS WHEREOF, this Merger Agreement has been executed the day and year
first above written.


                                       BANCFIRST CORPORATION
ATTEST:

/s/ Sam D. Ott                         By:  /s/ David E. Rainbolt
- ----------------------                    ----------------------------
Secretary                                 President


                                       AMQUEST FINANCIAL CORPORATION
ATTEST:  

/s/ Penny Morales                      By:  /s/ John Hugon
- ----------------------                    ----------------------------
Secretary                                 Vice Chairman

                                      -50-

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE INTERIM
FINANCIAL STATEMENTS OF THE REGISTRANT FOR THE THREE MONTHS ENDED MARCH 31, 1997
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                         102,916
<INT-BEARING-DEPOSITS>                             100
<FED-FUNDS-SOLD>                                29,000
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    357,402
<INVESTMENTS-CARRYING>                          39,509
<INVESTMENTS-MARKET>                            40,273
<LOANS>                                        926,769
<ALLOWANCE>                                     12,699
<TOTAL-ASSETS>                               1,532,855
<DEPOSITS>                                   1,357,653
<SHORT-TERM>                                     5,061
<LIABILITIES-OTHER>                             11,624
<LONG-TERM>                                     32,024
                                0
                                          0
<COMMON>                                         6,363
<OTHER-SE>                                     120,128
<TOTAL-LIABILITIES-AND-EQUITY>               1,532,855
<INTEREST-LOAN>                                 20,897
<INTEREST-INVEST>                                5,078
<INTEREST-OTHER>                                   499
<INTEREST-TOTAL>                                26,474
<INTEREST-DEPOSIT>                              10,200
<INTEREST-EXPENSE>                              11,074
<INTEREST-INCOME-NET>                           15,400
<LOAN-LOSSES>                                      577
<SECURITIES-GAINS>                                   0
<EXPENSE-OTHER>                                 12,871
<INCOME-PRETAX>                                  6,328
<INCOME-PRE-EXTRAORDINARY>                       3,970
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,970
<EPS-PRIMARY>                                     0.62
<EPS-DILUTED>                                     0.60
<YIELD-ACTUAL>                                    5.01
<LOANS-NON>                                      3,429
<LOANS-PAST>                                     1,086
<LOANS-TROUBLED>                                   358
<LOANS-PROBLEM>                                 12,463
<ALLOWANCE-OPEN>                                12,284
<CHARGE-OFFS>                                      528
<RECOVERIES>                                        75
<ALLOWANCE-CLOSE>                               12,699
<ALLOWANCE-DOMESTIC>                            12,699
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                         11,042
        

</TABLE>


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