<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    Form 10-Q

           X  Quarterly Report Pursuant to Section 13 or 15(d) of the
          ---
                       Securities and Exchange Act of 1934

              For the quarterly period ended September 30, 2000, 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 No. 0-17000


                    COMMERCIAL NATIONAL FINANCIAL CORPORATION
             (Exact name of registrant as specified in its charter)


           Michigan                                       38-2799780
   (State of Incorporation)                    (IRS Employer Identification No.)


101 North Pine River Street, Ithaca, Michigan                48847
   (address of principal executive offices)               (ZIP Code)


       Registrant's telephone number, including area code: (517) 875-4144

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

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.

           Class                                 Outstanding at October 24, 2000
           -----                                 -------------------------------
        Common Stock                                        3,331,298
        No Par Value










<PAGE>   2
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

                                      INDEX

<TABLE>
<CAPTION>
PART I                                              FINANCIAL INFORMATION
------                                              ---------------------

<S>                 <C>                                                                                     <C>
Item 1.             Financial Statements

                    Consolidated Balance Sheets as of September 30, 2000 and December 31, 1999              (Page 3)

                    Consolidated Statements of Income for the three and nine months ended September 30,     (Page 4)
                    2000 and September 30,1999

                    Consolidated Statements of Changes in Shareholders' Equity
                    for the nine months ended September 30, 2000 and September 30, 1999                     (Page 5)

                    Consolidated Statements of Cash Flows for the nine months ended September 30, 2000      (Page 6)
                    and September 30, 1999

                    Notes to Consolidated Financial Statements                                              (Page 7-11)

Item 2.             Management's Discussion and Analysis of Financial Condition and Results of Operations   (Page 12-17)

PART II                                               OTHER INFORMATION
-------                                               -----------------

Item 6.             Exhibits and Reports on Form 8-K

                    b)       Exhibit 27-Financial Data Schedule                                             (Page 20)
                    c)       Reports on Form 8-K                                                            (Page 18)

SIGNATURES                                                                                                  (Page 19)
</TABLE>










                                        2
<PAGE>   3
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

                           CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                                                 September 30,         December 31,
                                                                                                     2000                  1999
                                                                                                     ----                  ----
                                                                                                  (Unaudited)
<S>                                                                                              <C>                  <C>
ASSETS
Cash and due from banks                                                                          $  5,858,485         $   7,419,093
Federal funds sold                                                                                  1,200,000             1,250,000
                                                                                                 ------------         -------------
       Total cash and cash equivalents                                                              7,058,485             8,669,093
Securities available for sale                                                                      19,311,362            17,746,753
Securities held to maturity (fair value $ 8,749,518  -
    September 30, 2000; $8,940,714 - December 31, 1999)                                             8,603,402             8,813,986
Federal Home Loan Bank stock, at cost                                                               1,391,300             1,391,300
Loans receivable, net of allowance for loan losses
    $2,507,788-September 30, 2000; $2,792,293- December 31, 1999                                  169,180,370           149,674,589
Premises and equipment, net                                                                         2,513,194             2,694,511
Accrued interest receivable and other assets                                                        2,338,437             2,031,782
                                                                                                 ------------         -------------

       Total assets                                                                              $210,396,550         $ 191,022,014
                                                                                                 ============         =============

LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities
       Deposits
              Noninterest-bearing demand                                                         $ 17,946,404         $  18,535,251
              Interest-bearing demand                                                              25,909,929            26,639,403
              Savings                                                                              41,442,992            41,271,920
              Time                                                                                 72,223,452            60,757,458
                                                                                                 ------------         -------------
                    Total deposits                                                                157,522,777           147,204,032
       Securities sold under agreements to repurchase                                               7,389,775             4,689,557
       Other borrowings                                                                               736,830             2,190,639
       Federal Home Loan Bank advances                                                             23,500,000            16,500,000
       Accrued expenses and other liabilities                                                       1,684,424             1,473,253
                                                                                                 ------------         -------------
              Total liabilities                                                                   190,833,806           172,057,481

Shareholders' equity
       Common stock and paid in capital, no par value: 5,000,000 shares
         authorized; shares issued and outstanding September 30, 2000 -
         3,319,481 and December 31,
         1999 - 3,348,476                                                                          19,545,786            19,946,643
       Retained earnings (deficit)                                                                      4,560              (830,339)
       Accumulated other comprehensive income/(loss), net of tax                                       12,398              (151,771)
                                                                                                 ------------         -------------
              Total shareholders' equity                                                           19,562,744            18,964,533
                                                                                                 ------------         -------------

                    Total liabilities and shareholders' equity                                   $210,396,550         $ 191,022,014
                                                                                                 ============         =============
</TABLE>




                                                          See accompanying notes

                                       3
<PAGE>   4
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

                  CONSOLIDATED STATEMENTS OF INCOME (Unaudited)

<TABLE>
<CAPTION>
                                                                For Three Months                For Nine Months
                                                               Ended September 30,            Ended September 30,
                                                               2000           1999            2000           1999
                                                               ----           ----            ----           ----
<S>                                                        <C>           <C>              <C>           <C>
Interest and dividend income
    Loans receivable, including fees                       $ 3,760,498   $ 3,113,208      $ 10,576,943  $ 8,924,411
    Taxable securities                                         237,506       284,665           701,437      780,947
    Nontaxable securities                                      146,952       154,839           436,897      482,042
    Federal funds sold                                           7,489        16,967            81,452       69,876
    Federal Home Loan Bank stock dividends                      29,727        28,054            85,075       83,249
    Interest on other deposits                                  14,109         9,512            32,904       24,401
                                                           -----------   -----------      ------------  -----------

        Total interest and dividend income                   4,196,281     3,607,245        11,914,708   10,364,926

Interest expense
    Deposits                                                 1,477,359     1,130,806         4,046,611    3,322,908
    Securities sold under agreements to repurchase             114,989        75,516           276,334      240,940
    Federal Home Loan Bank advances                            335,417       249,518           863,432      608,846
    Other                                                       13,302        10,098            35,648       23,495
                                                           -----------   -----------      ------------  -----------
        Total interest expense                               1,941,067     1,465,938         5,222,025    4,196,189

Net interest income                                          2,255,214     2,141,307         6,692,683    6,168,737

Provision for loan losses                                       90,000        90,000           270,000      270,000
                                                           -----------   -----------      ------------  -----------

Net interest income after provision for loan losses          2,165,214     2,051,307         6,422,683    5,898,737

Noninterest income
    Service charges and fees                                   114,176       124,460           329,615      350,870
    Net gains on loan sales                                     23,626        47,869            55,047      172,437
    Receivable financing fees                                   37,395        31,117           193,273      160,673
    Net gains on sales of securities available for sale              -             -                 -        2,134
    Other                                                       72,584        54,269           199,436      190,948
                                                           -----------   -----------      ------------  -----------
        Total noninterest income
                                                               247,781       257,715           777,371      877,062

Noninterest expenses
    Salaries and employee benefits                             736,936       687,506         2,191,102    2,046,910
    Occupancy and equipment                                    250,887       278,212           748,454      779,081
    FDIC insurance                                               7,716         5,487            22,764       16,704
    Printing, postage and supplies                              68,302        61,174           196,643      185,895
    Professional and outside services                           63,028        74,050           232,287      251,628
    Other                                                      256,144       255,137           735,606      727,093
                                                           -----------   -----------      ------------  -----------
        Total noninterest expense                            1,383,013     1,361,566         4,126,856    4,007,311
                                                           -----------   -----------      ------------  -----------
Income before income tax expense                             1,029,982       947,456         3,073,198    2,768,488
Income tax expense                                             298,000       269,906           899,000      783,000
                                                           -----------   -----------      ------------  -----------

Net income                                                  $  731,982    $  677,550      $  2,174,198   $1,985,488
                                                           ===========   ===========      ============  ===========

Per share information
    Basic earnings                                           $    0.22     $    0.20        $     0.65    $    0.60
    Diluted earnings                                         $    0.22     $    0.20        $     0.65    $    0.60
    Dividends declared                                       $    0.13     $    0.13        $     0.40    $    0.39
</TABLE>

                                                          See accompanying notes


                                       4
<PAGE>   5
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

           CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY
      Periods ended September 30, 2000 and September 30, 1999 (Unaudited)

<TABLE>
<CAPTION>
                                                                                             Accumulated
                                                            Common                              Other
                                                           Stock and        Retained        Comprehensive         Total
                                                            Paid in         Earnings        Income (Loss)     Shareholders'
                                                            Capital        (deficit)         Net of Tax          Equity
---------------------------------------------------------------------------------------------------------------------------
<S>                                                      <C>             <C>                <C>               <C>
Balance at December 31, 1998                             $ 17,525,466    $    (8,483)         $ 143,119       $ 17,660,102

Comprehensive income:
Net income                                                                 1,985,488                             1,985,488
 Net change in unrealized gains/(losses) on
   securities available for sale                                                               (332,722)          (332,722)
Reclassification adjustment for (gains)/losses
   recognized in income                                                                          (2,134)            (2,134)
Tax effects                                                                                     113,851            113,851
                                                                                              ---------       ------------
Total other comprehensive income (loss)                                                        (221,005)          (221,005)
                                                                                                              ------------
     Total comprehensive income                                                                                  1,764,483
                                                                                                              ------------

Cash dividends declared, $.39 per share                                   (1,283,339)                           (1,283,339)

Issued under dividend reinvestment program                    505,056                                              505,056
Issued under stock option plan                                 87,047                                               87,047
Issued under employee benefit plan                             35,166                                               35,166
Repurchase and retirement of 16,837 shares                   (200,150)                                            (200,150)
                                                         ------------    -----------          ---------       ------------
Balance at September 30, 1999                            $ 17,952,585    $   693,666          $ (77,886)      $ 18,568,365
                                                         ============    ===========          =========       ============

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

Balance at December 31, 1999                             $ 19,946,643     $ (830,339)        $ (151,771)      $ 18,964,533
Comprehensive income:
Net income                                                                 2,174,198                             2,174,198
 Net change in unrealized gains/(losses) on
   securities available for sale                                                                248,741            248,741
Tax effects                                                                                     (84,572)           (84,572)
                                                                                              ---------       ------------
Total other comprehensive income                                                                164,169            164,169
                                                                                                              ------------
     Total comprehensive income                                                                                  2,338,367

Cash dividends declared, $.40 per share                                   (1,339,299)                           (1,339,299)

Issued under dividend reinvestment program                    437,970                                              437,970
Issued under stock option plan                                 41,099                                               41,099
Issued under employee benefit plan                             63,126                                               63,126
Repurchase and retirement of 75,215 shares                   (943,052)                                            (943,052)
                                                         ------------    -----------          ---------       ------------
Balance at September 30, 2000                            $ 19,545,786    $     4,560          $  12,398       $ 19,562,744
                                                         ============    ===========          =========       ============
</TABLE>

                                                          See accompanying notes



                                       5
<PAGE>   6
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

                CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

<TABLE>
<CAPTION>
                                                                                        For Nine Months Ended
                                                                                             September 30,
                                                                                          2000            1999
                                                                                          ----            ----
<S>                                                                                   <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES
    Net income                                                                        $ 2,174,198     $ 1,985,488
    Adjustments to reconcile net income to net
      cash from operating activities
          Provision for loan loss                                                         270,000         270,000
          Net gains on loan sales                                                         (55,047)       (172,437)
          Originations of loans held for sale                                          (2,394,473)     (8,260,335)
          Proceeds from sales of loans held for sale                                    2,586,520       8,432,772
          Gain on sales of securities available for sale                                        -          (2,134)
          Depreciation, amortization and accretion                                        420,943         579,869
          Net change in accrued interest receivable and other assets                     (349,649)       (442,102)
          Net change in accrued expenses and other liabilities                            211,171        (811,561)
                                                                                      -----------     -----------
               Net cash from operating activities                                       2,863,663       1,579,560

CASH FLOWS FROM INVESTING ACTIVITIES
          Purchases of securities available for sale                                   (5,071,911)     (8,280,410)
          Proceeds from maturities of securities available for sale                     3,955,000       2,400,000
          Proceeds from sales of securities available for sale                                  -         500,664
          Proceeds from maturities of securities held to maturity                               -       2,441,600
          Net change in loans                                                         (19,961,159)    (13,107,294)
          Purchases of premises and equipment, net                                       (221,199)       (480,690)
                                                                                      -----------     -----------
               Net cash from investing activities                                     (21,299,269)    (16,526,130)

CASH FLOW FROM FINANCING ACTIVITIES
          Net change in deposits                                                       10,318,745       4,845,804
          Net change in securities sold under agreements to repurchase                  2,700,218      (1,831,031)
          Net change in U.S. Treasury demand notes                                     (1,453,809)        307,922
          Federal Home Loan Bank advances                                              26,000,000      19,000,000
          Federal Home Loan Bank repayments                                           (19,000,000)    (13,000,000)
          Repurchase of common stock shares                                              (943,052)       (200,150)
          Dividends paid and fractional shares                                         (1,339,299)     (1,283,339)
          Proceeds from sale of common stock                                              542,195         627,269
                                                                                      -----------     -----------
               Net cash from financing activities                                      16,824,998       8,466,475
                                                                                      -----------     -----------

Net change in cash and cash equivalents                                                (1,610,608)     (6,480,095)

Cash and cash equivalents, at beginning of year                                         8,669,093      12,555,428
                                                                                      -----------     -----------

CASH AND CASH EQUIVALENTS, AT END OF PERIOD                                           $ 7,058,485     $ 6,075,333
                                                                                      ===========     ===========
Cash paid during the period for
          Interest                                                                    $ 5,118,758     $ 4,233,069
          Federal income taxes                                                            771,640       1,121,000
</TABLE>

                                                          See accompanying notes

                                       6
<PAGE>   7
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

Note 1-Summary of Significant Accounting Policies

Basic Presentation
The accompanying unaudited condensed consolidated financial statements were
prepared in accordance with Rule 10-01 of regulation S-X and the instructions
for Form 10-Q and, therefore, do not include all disclosures required by
generally accepted accounting principles for complete presentation of financial
statements. In management's opinion, the condensed consolidated financial
statements contain all adjustments (consisting of normal recurring accruals)
necessary to present fairly the financial condition of Commercial National
Financial Corporation as of September 30, 2000 and December 31, 1999, and the
results of its operations for the three and nine months ending September 30,
2000 and September 30, 1999. The results for the three and nine months ended
September 30, 2000 are not necessarily indicative of the results expected for
the full year.

Principals of Consolidation
The accompanying consolidated financial statements include the accounts of
Commercial National Financial Corporation (CNFC), Commercial Bank (Bank) and
CNFC Financial Services, Inc., a wholly owned subsidiary of the Bank. All
material intercompany accounts and transactions have been eliminated in
consolidation.

Nature of Operations, Industry Segments and Concentrations of Credit Risk
CNFC is a one-bank holding company, which conducts limited business activities.
The Bank performs the majority of business activities.

The Bank provides a full range of banking services to individuals, agricultural
businesses, commercial businesses and light industries located in its service
area. It maintains a diversified loan portfolio, including loans to individuals
for home mortgages, automobiles and personal expenditures, and loans to business
enterprises for current operations and expansion. The Bank offers a variety of
deposit products, including checking, savings, money market, individual
retirement accounts and certificates of deposit. While CNFC's chief
decision-makers monitor the revenue stream of various products and services,
operations are managed and financial performance is evaluated on a
corporation-wide basis. Accordingly, management considers all of the CNFC's
banking operations to be aggregated into one operating segment.

The principal markets for the Bank's financial services are the Michigan
communities in which the Bank is located and the areas surrounding these
communities. The Bank serves these markets through seven offices located in
Gratiot and Montcalm Counties in Michigan.

Use of Estimates
To prepare financial statements in conformity with generally accepted accounting
principles, management makes estimates and assumptions based on available
information. These estimates and assumptions affect the amounts reported in the
financial statements and the disclosures provided. Future results could differ.
The allowance for loan losses and fair values of securities and other financial
instruments are particularly subject to change.

Cash Flow Reporting
Cash and cash equivalents include cash on hand, demand deposits with other
financial institutions and federal funds sold. Cash flows are reported net for
customer loan and deposit transactions, securities sold under agreements to
repurchase with original maturity of 90 days or less and U.S. Treasury demand
notes.

Securities
Securities are classified as held to maturity and carried at amortized cost when
management has the positive intent and ability to hold them to maturity.
Securities are classified as available for sale when they might be sold before
maturity. Securities available for sale are carried at fair value, with net
unrealized holding gains and losses reported separately in other comprehensive
income (loss), net of tax. Trading securities are bought principally for sale in
the near term, and are reported at fair value with unrealized gains and losses
included in earnings. Securities are written down to fair value when a decline
in fair value is not temporary. CNFC did not classify securities for trading at
any time during 2000 or 1999.

                                       7
<PAGE>   8
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

Gains and losses on sales are determined using the amortized cost of the
specific security sold. Interest and dividend income, adjusted by amortization
of purchase premiums and discounts, is included in earnings.

Loans Held for Sale
Loans held for sale are reported at the lower of cost or market value in the
aggregate. Net unrealized losses are recorded in a valuation allowance by
charges to income.

Loans Receivable
Loans receivable are reported at the principal balance outstanding, net of
unearned interest, deferred loan fees and costs, and an allowance for loan
losses. Interest income is reported on the interest method and includes
amortization of net deferred loan fees and costs over the loan term.

Interest income is not reported when full loan repayment is in doubt, typically
when payments are past due over 90 days, unless the loan is both well secured
and in the process of collection. Payments received on such loans are reported
as principal reductions.

Allowance for Loan Losses
The allowance for loan losses is a valuation allowance for probable credit
losses, increased by the provision for loan losses and decreased by charge-offs
less recoveries. Estimating the risk of loss and the amount of loss on any loan
is subjective. Accordingly, management estimates the allowance balance required
based on past loan loss experience, known and inherent risks in the portfolio,
information about specific borrower situations and estimated collateral values,
economic conditions, and other factors. Allocations of the allowance may be made
for specific loans, but the entire allowance is available for any loan that
should be charged-off. A problem loan is charged-off by management as a loss
when deemed uncollectible, although collection efforts continue and future
recoveries may occur.

Loan impairment is reported when full payment under the loan terms is not
expected. Impairment is evaluated in total for smaller-balance loans of similar
nature such as residential mortgage and consumer loans and individually for
other loans. If a loan is impaired, a portion of the allowance is allocated so
that the loan is reported, net, at the present value of estimated future cash
flows using the loan's existing rate or at the fair value of collateral if
repayment is expected solely from the collateral. Loans are evaluated for
impairment when payments are delayed, typically 90 days or more, or when it is
probable that all principal and interest amounts will not be collected according
to the original terms of the loan.

Premises and Equipment
Premises and equipment are stated at cost less accumulated depreciation.
Depreciation is computed using a combination of straight-line and accelerated
methods with useful lives ranging from 10 to 40 years for buildings and
improvements, and 3 to 10 years for furniture and equipment. These assets are
reviewed for impairment when events indicate their carrying amount may not be
recoverable from future undiscounted cash flows. Maintenance, repairs and minor
alterations are charged to current operations as expenditures occur. Major
improvements are capitalized.

Servicing Rights
Servicing rights represent both purchased rights and the allocated value of
servicing rights retained on loans sold. Servicing rights are expensed in
proportion to, and over the period of, estimated net servicing revenues.

Impairment is evaluated based on the fair value of the rights, using groupings
of the underlying loans as to interest rates and then, secondarily, as to
geographic and prepayment characteristics. Any impairment of a grouping is
reported as a valuation allowance.

Excess servicing receivable is reported when a loan sale results in servicing in
excess of normal amounts and is expensed over the life of the servicing on the
interest method.

Other Real Estate Owned
Real estate properties acquired in collection of a loan receivable are recorded
at fair value at acquisition. Any reduction to fair value from the carrying
value of the related loan is accounted for as a loan loss. After acquisition, a
valuation allowance reduces the reported amount to the lower of the initial
amount or fair value less costs to sell. Expenses, gains and losses on
disposition, and changes in the valuation allowance are reported in other
expense.

                                       8
<PAGE>   9
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

Securities Sold Under Agreements to Repurchase
All of these liabilities represent amounts advanced by various customers and are
secured by securities owned, as they are not covered by general deposit
insurance.

Employee Benefits
A benefit plan with 401(k) features covers substantially all employees. The plan
allows participant compensation deferrals. The amount of any matching
contribution is based solely on the discretion of the board of directors.
Historically, the CNFC has matched up to 6% of such deferrals at 100%.

Expense for employee compensation under stock option plans is reported only if
options are granted below market price at grant date.

Income Taxes
Income tax expense is the sum of the current year income tax due or refundable
and the change in deferred tax assets and liabilities. Deferred tax assets and
liabilities are the expected future tax consequences of temporary differences
between the carrying amounts and tax bases of assets and liabilities, computed
using enacted tax rates. A valuation allowance, if needed, reduces deferred tax
assets to the amount expected to be realized.

Earnings and Dividends Per Share
Basic earnings per common share is based on net income divided by the weighted
average number of common shares outstanding during the period. Diluted earnings
per common share shows the diluted effect of any additional potential common
shares. Earnings and dividends per common share are restated for all stock
splits and stock dividends, including the 5% stock dividend declared September
20, 2000 and payable on November 13, 2000.

Stock Dividends
Dividends issued in stock are reported by transferring the market value of the
stock issued from retained earnings to common stock and additional paid-in
capital. Fractional shares are paid in cash for all stock dividends.

Comprehensive Income
Comprehensive income consists of net income and other comprehensive income
(loss). Other comprehensive income (loss) includes the change in unrealized
appreciation and depreciation on securities available for sale, net of tax,
which is also recognized as a separate component of shareholders' equity.

Financial Instruments with Off-Balance-Sheet Risk
CNFC, in the normal course of business, makes commitments to make loans, which
are not recorded in the financial statements.

Fair Values of Financial Instruments
Fair values of financial instruments are estimated using relevant market
information and other assumptions. Fair value estimates involve uncertainties
and matters of significant judgment regarding interest rates, credit risk,
prepayments, and other factors, especially in the absence of broad markets for
particular items. Changes in assumptions or in market conditions could
significantly affect the estimates. The fair value estimates of existing on-and
off-balance-sheet financial instruments do not include the value of anticipated
future business or values of assets and liabilities not considered financial
instruments.

Reclassifications
Some items in the prior year financial statements have been reclassified to
conform with the current year presentation.

Recent Accounting Pronouncements
SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities, as
amended by SFAS No. 138, requires derivative instruments be carried at fair
value on the balance sheet. The statement continues to allow derivative
instruments to be used to hedge various risks and sets forth specific criteria
to be used to determine when hedge accounting can be used. The statement also
provides for offsetting changes in fair value or cash flows of both the
derivative and the hedged asset or liability to be recognized in earnings in the
same period; however, any changes in fair value or cash flow that represent the
ineffective portion of a hedge are required to be recognized in earnings and
cannot be


                                       9
<PAGE>   10
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

deferred. For derivative instruments not accounted for as hedges, changes in
fair value are required to be recognized in earnings.

The adoption of SFAS No. 133 as amended becomes effective beginning January 1,
2001 and is not expected to have a material impact on the CNFC's financial
position or results of operations.

Note 2 - Earnings Per Share
A reconciliation of the numerators and denominators of the basic earnings per
share and diluted earnings per share computations for the periods ended is
presented below:

<TABLE>
<CAPTION>
                                                                     SEPTEMBER 30, 2000       SEPTEMBER 30, 1999
----------------------------------------------------------------------------------------------------------------
<S>                                                                  <C>                        <C>
BASIC EARNINGS PER SHARE:
Net income available to common shareholders                            $     2,174,198           $     1,985,488
================================================================================================================

Weighted-average common shares outstanding for
basic earnings per share                                                     3,343,918                 3,321,764
================================================================================================================

BASIC EARNINGS PER SHARE                                               $           .65           $           .60
================================================================================================================


DILUTED EARNINGS PER SHARE:
Net income available to common shareholders                            $     2,174,198           $     1,985,488
================================================================================================================

Weighted-average common shares outstanding for basic
    earnings per share                                                       3,343,918                 3,321,764

Add:
Dilutive effect of assumed exercise of stock options                            18,164                    13,848
----------------------------------------------------------------------------------------------------------------

Weighted-average common and dilutive additional potential
    common shares  outstanding                                               3,362,082                 3,335,612
================================================================================================================

DILUTED EARNINGS PER SHARE                                             $           .65           $           .60
================================================================================================================
</TABLE>




Note 3 - Stock Option Plans
SFAS No. 123, Accounting for Stock-Based Compensation requires proforma
disclosures for companies that do not adopt its fair value accounting method for
stock-based employee compensation. The following proforma information presents
net income and basic and diluted earnings per share had the fair value method
been used to measure compensation cost for stock option plans. The exercise
price of options granted is equivalent to the market value of underlying stock
at the grant date. No compensation cost was actually recognized for stock
options.


                                       10
<PAGE>   11
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION


The fair value of options granted during 2000 and 1999 is estimated using the
following weighted-average information:

<TABLE>
<CAPTION>
-------------------------- ------------------------ ------------------------ ------------------------ -----------------------
                           Risk-free Interest Rate        Expected Life         Expected Dividends       Price Volatility
-------------------------- ------------------------ ------------------------ ------------------------ -----------------------
<S>                        <C>                      <C>                      <C>                      <C>
Granted during 2000                   5.6%                    3.9                     4.67%                   11.36%
-------------------------- ------------------------ ------------------------ ------------------------ -----------------------
Granted during 1999                   6.2%                    5.0                     4.00%                   10.00%
-------------------------- ------------------------ ------------------------ ------------------------ -----------------------
</TABLE>

The weighted average fair value of options granted during the nine months ended
September 30, 2000 and 1999 was $1.13 and $1.09.


Stock option plans are used to reward employees and provide them with an
additional equity interest. Options granted to employees are issued for 7 year
periods, with vesting occurring over a 5 year period. Options granted to
directors are issued for 2 year periods with vesting occurring after 6 months.
At year-end 1999, 133,850 shares were authorized for future grants. At September
30, 2000 92,604 shares were authorized for future grants. The current stock
option plan expires December 31, 2000. Information about option grants follows.

<TABLE>
<CAPTION>
                                         Number          Weighted Average
                                       of Options         Exercise Price
-----------------------------------------------------------------------
<S>                                    <C>               <C>
Outstanding, beginning of 1998           75,931               $   8.88
   Granted                               35,420                  11.18
   Exercised                            (16,937)                  9.36
----------------------------------------------------------------------
Outstanding, end of 1999                 94,414                   9.66
   Granted                               41,246                  12.62
   Exercised                             (4,305)                  9.54
----------------------------------------------------------------------
Outstanding, September 30,  2000        131,355               $  10.59
======================================================================
</TABLE>

At year-end 1999, options outstanding had a weighted-average remaining life of
5.2 years and a range of exercise price from $6.21 to $11.18. At September 30,
2000, the weighted-average remaining life was 5.1 years and the range of
exercise prices was from $6.21 to $12.62.

Options exerciseable at end of period are as follows.

<TABLE>
<CAPTION>
                         Number    Weighted Average
                       of Options   Exercise Price
----------------------------------------------------
<S>                    <C>         <C>
December 30,1999         47,847        $ 8.23
September 30, 2000       53,826        $ 8.68
</TABLE>


                                       11
<PAGE>   12


                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

ITEM 2: MANAGEMENT DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
        AND RESULTS OF OPERATIONS

Financial Condition
Total assets at September 30, 2000 increased to $210,397,000 from the
$191,022,000 at December 31, 1999. Total loans were $171,688,000 as of September
30, 2000. This represents an $19,221,000 or 12.6% increase from December 31,
1999 balance of $152,467,000. The increase in loans was primarily a result of
demand for business loans and management's decision to portfolio, rather than
sell, an increasing number of residential mortgage loans originated during the
period. However, management has recently identified a weakening of loan demand
in recent months, most likely due to the increases in interest rates. Investment
securities also increased to $29,306,000 at September 30, 2000 compared to
$27,952,000 at December 31, 1999.

Deposits increased $10,319,000 or 7.0% during the period. Total deposits at
September 30, 2000 were $157,523,000 compared to $147,204,000 at December 31,
1999. Deposits, along with other forms of debt are used to fund loans and other
investments. Traditionally, community bank's relied on retail deposit as a
primary, if not sole source of funding for loans. Many community bank's are
struggling to obtain enough retail deposit balances at a reasonable cost to fund
loan growth. Commercial Bank is no exception. Deposit money continues to flow to
mutual funds and other stock and bond investments that offer the potential for
higher returns than traditional bank products offer. Also, the Bank continues to
compete for deposit funding against competitors offering deposit rates in excess
of rates paid on other viable funding sources. These issues do not appear to be
temporary phenomenon. It is for these reasons that the Bank continues to seek
alternatives to retail deposits. We view these non-traditional sources of
funding as permanent.

Included in the deposit total are certificates of deposit obtained through an
online certificate of deposit network. The Bank is accessing this source of
funding more frequently and regularly. The participants in this network are
primarily banks, and credit unions. Rates are posted on an electronic bulletin
board available to participants in the network. Certificate of deposits gathered
through this method are generally in increments of $100,000 or less. Deposits
gathered through this network totaled $11,110,000 at September 30, 2000. This
compares to $3,500,000 at December 31, 1999.

The Bank also continues to fund loan growth with various products offered by the
Federal Home Loan Bank of Indianapolis. At September 30, 2000 the Bank had
$23,500,000 in outstanding balances, compared to $16,500,000 at December 31,
1999.

Liquidity
Management defines liquidity as the ability to fund appropriate levels of credit
worthy loans, meet the immediate cash withdrawal requirements of depositors, and
maintain access to sufficient resources to meet unexpected contingencies at a
reasonable cost and or with minimum losses.

While loan growth continues, the Bank's retail deposit base has not increased at
the same rate. As discussed above, the Bank continues to attract deposits
through an online service. The loan to deposit ratio at September 30, 2000 was
109.0% compared to 103.6% at December 31, 1999. Management believes that the
combination of available FHLB advances, Federal funds lines of credit, the
available for sale investment portfolio, and our ability to sell mortgage loans
and the government guaranteed portion of commercial loans provides adequate
short and medium term sources of liquidity. At a minimum the Bank has the
following available to meet short-term liquidity needs: $10,400,000 in available
FHLB advances and $9,000,000 in short term lines of credit with correspondent
banks.

CNFC also needs cash to pay dividends to its shareholders. The primary source of
cash is the dividends paid to CNFC by the Bank. Management believes that cash
from operations is sufficient to supply the cash needed to continue paying a
reasonable dividend. CNFC also has a $1,500,000 line of credit with a
correspondent institution.



                                       12
<PAGE>   13
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION


Asset Quality and the Allowance for Loan Loss
The allowance for loan losses was 1.46% of total loans at September 30, 2000 and
1.83% at December 31, 1999. At September 30, 2000 $325,000 is classified as
non-accrual compared to $978,000 at September 30, 1999.

Year to date net charge-offs totaled $555,000 compared to net recoveries of
$77,000 during the nine months ended September 30, 1999. At September 30, 2000
the Bank has identified $436,000 of loans as non-performing. This compares to
$989,000 at September 30, 1999. At September 30, 2000 $914,000 or .5% of loans
are currently past due. This compares to 1.7% at September 30, 1999.


Year to date, CNFC expensed a provision of $270,000, which was the same as the
amount expensed for the nine months ended September 30, 1999. During the quarter
CNFC expensed a provision of $90,000 to the allowance compared to $90,000 during
the same period in 1999.

Management continues to systematically evaluate the adequacy of the allowance
such that the balance is commensurate with the performance of the loan
portfolio, loan growth, general market conditions and other relevant factors.

Capital Resources
CNFC's capital ratios continue to exceed regulatory guidelines for a "well
capitalized" institution. A summary of CNFC's capital ratios follows:

<TABLE>
<CAPTION>
                                           September 30,     December 31,      Minimum Required to be
                                               2000              1999          Well Capitalized Under
                                               ----              ----         Prompt Corrective Action
                                                                                     Regulations
                                                                                     -----------
<S>                                        <C>               <C>              <C>
Total capital to risk weighted assets          13.2%            14.3%                   10.0%
                                               =====            =====                   =====
Tier 1 capital to risk weighted assets         11.9%            13.0%                    6.0%
                                               =====            =====                   =====
Tier 1 capital to average assets                9.5%            10.0%                    5.0%
                                               =====            =====                   =====
</TABLE>

Results of Operations
Net income for the quarter ended September 30, 2000 was $732,000, an increase of
$54,000, or 8.0% compared to the same period in 1999. A 5.3% increase in net
interest income generated by strong loan demand is the primary contributing
factor to the increase in net income. In addition CNFC recorded a $10,000 or
3.9% decrease in non-interest income and a modest $21,000 or 1.5% increase in
non-interest expense.

Net income for the nine months ended September 30, 2000 was $2,174,000, an
increase of $189,000 or 9.5%. Strong loan demand generated a $524,000 or 8.5%
increase in net interest income. Offsetting the increase in net interest income
was a $100,000 or 11.4% decrease in non-interest income and a modest $120,000 or
3.0% increase in non-interest expense. The factors affecting these changes are
discussed in the following paragraphs.

Net Interest Income
The following table illustrates the effect that changes in rates and volumes of
interest-earning assets and interest-bearing liabilities had on tax equivalent
net interest income for the three and nine months ending September 30, 2000 and
1999.

                                       13
<PAGE>   14
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION


<TABLE>
<CAPTION>
                                       Three Months Ending Sept. 30,       Nine Months Ending Sept. 30,

                                          2000             1999                2000             1999
                                          ----             ----                ----             ----
<S>                                   <C>              <C>                 <C>              <C>
Interest Income (tax equivalent)      $  4,326,431     $  3,731,979        $ 12,382,226     $ 10,817,986
Interest Expense                         1,941,067        1,465,938           5,222,025        4,196,189
                                      ------------     ------------        ------------     ------------
Net Interest Income                   $  2,385,364     $  2,266,041        $  7,160,201     $  6,621,797
                                      ============     ============        ============     ============

Average Volume
--------------
Interest earning Assets               $198,763,637     $181,559,090        $193,091,714     $176,450,962
Interest bearing Liabilities           165,861,771      149,634,532         160,635,109      145,571,711
                                      ------------     ------------        ------------     ------------
Net Differential                      $ 32,901,866     $ 31,924,558        $ 32,456,605     $ 30,879,251
                                      ============     ============        ============     ============
Average Yields/Rates (annualized)
---------------------------------
Yield on Earning Assets                      8.64%            8.16%               8.54%            8.20%
Rate Paid on Liabilities                     4.64%            3.89%               4.33%            3.85%
                                             -----            -----               -----            -----

Interest Spread                              4.00%            4.27%               4.21%            4.35%
                                             =====            =====               =====            =====

Net Interest Margin                          4.76%            4.95%               4.94%            5.02%
                                             =====            =====               =====            =====
</TABLE>




The change in tax equivalent net interest income is attributable to the
following:

<TABLE>
<CAPTION>
                                                       Three Months Ending                           Nine months Ending
                                                        September 30, 2000                           September 30, 2000
                                               Volume          Rate        Inc/(Dec)        Volume          Rate          Inc/(Dec)
                                               ------          ----        ---------        ------          ----          ---------
<S>                                           <C>           <C>            <C>            <C>             <C>             <C>
Interest Earning Assets                       $430,506      $ 163,946       $594,452      $1,227,538      $ 336,702       $1,564,240
Interest Bearing Liabilities                   242,161        232,968        475,129         596,175        429,661        1,025,836
                                              --------      ---------       --------      ----------      ---------       ----------
Net Interest Income                           $188,345      $ (69,022)      $119,323      $  631,363      $ (92,959)      $  538,404
                                              ========      =========       ========      ==========      =========       ==========
</TABLE>

The increase in net interest income for the nine months ending September 30,
2000 is due to an increase in earning assets which was only partially offset by
a decreasing margin. Net interest margin for the nine months ending September
30, 2000 decreased to 4.94% compared to 5.02% for the nine months ending
September 30, 1999. Average earning assets for the nine months ending September
30, 2000 increased $16,641,000 compared to the same period in 1999.

During 1999, the Federal Reserve increased the Fed Funds rate three times, each
time by 25 basis points. The Federal Reserve also increased the Fed Funds rate
by 25 basis points twice during the first quarter of 2000, and by 50 basis
points once during May of 2000. This change in prime results in an almost
immediate increase in the Bank's prime lending rate. The interest rate on a
significant portion of the Bank's commercial loan portfolio is tied to the
prime-lending rate. Therefore, the Bank receives an immediate short-term benefit
to the increase in prime. In general, local deposit interest rates do not
respond as quickly to changes in the prime lending rate. However, the cost of
certificates of deposits gathered on the electronic network, and FHLB advances
are more sensitive to general changes in interest rates.

                                       14
<PAGE>   15
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

These funding sources have become more expensive and have offset the short-term
benefits gained from the increase in prime. Retail deposit costs have also
increased as more banks compete for a shrinking pool of deposits. Management
believes that net interest margin will continue to decrease as additional
deposit and other borrowing instruments reprice at higher rates.

Non-interest Income
Non-interest income for the nine months ending September 30, 2000 was $777,000.
This represents a $100,000 or 11.4% decrease over the same period in 1999.
Higher interest rates have reduced mortgage refinance activity and reduced the
number of mortgage loans originated. Also, management has elected to portfolio a
larger number of residential real estate mortgage loans that previously would
have been sold to the secondary market. As a result, gains on loan sales have
decreased by $117,000 or 68.0% compared to the nine months ending September 30,
1999. Offsetting this decrease is an increase in receivable financing fees.
Receivable financing fees increased $33,000 or 20.3% over the nine months ending
September 30, 1999.

For the three months ended September 30, 2000 CNFC non-interest income was
$10,000 or 3.9% less than the same period in 1999.

Non-interest Expense
Non-interest expense for the nine months ending September 30, 2000 totaled
$4,127,000. This represents a $120,000 or 3.0% increase over the same period in
1999.

Salary and benefit expense for the nine months ending September 30, 2000 totaled
$2,191,000 compared to $2,047,000 an increase of $144,000 or 7.0%. The increase
reflects normal salary increases, market adjustments and an 8.0% increase in the
cost of medical insurance effective August of 1999 and a 13.0% increase
effective August of 2000. Bank staffing levels have not significantly changed
compared to the same period in 1999. The increase in salary and benefit expense
accounts for 120.6% of the increase in non-interest expenses.

Professional fees for the nine months ended September 30, 2000, decreased
$19,000 or 7.7% compared to the same period in 1999. The Bank has reduced
expenses related to the implementation, support and maintenance of P.C.'s,
networks, and other technology related equipment.

The causes for the increases and decreases in non-interest expense for the three
months ended September 30, 2000 are the same as those described above.

Quantitative and Qualitative Disclosures about Market Risk CNFC's primary market
risk exposure is interest rate risk and, to a lesser extent, liquidity risk. All
of the CNFC's transactions are denominated in U.S. dollars with no specific
foreign exchange exposure. CNFC has a limited exposure to commodity prices
related to agricultural loans. Any impacts that changes in foreign exchange rate
and commodity prices would have on interest rates are assumed to be
insignificant.

Interest rate risk ("IRR") is the exposure of a banking organization's financial
condition to adverse movements in interest rates. Accepting this risk can be an
important source of profitability and stockholder value, however, excessive
levels of IRR could pose a significant threat to the CNFC's earnings and capital
base. Accordingly, effective risk management that maintains IRR at prudent
levels is essential to the CNFC's safety and soundness.

Evaluating a financial institution's exposure to changes in interest rates
includes assessing both the adequacy of the management process used to control
IRR and the organization's quantitative level of exposure. When assessing the
IRR management process, management seeks to ensure that appropriate policies,
procedures, management information systems and internal controls are in place to
maintain IRR at prudent levels with consistency and continuity. Evaluating the
quantitative level of IRR exposure requires the management to assess the
existing and potential future effects of changes in interest rates on

                                       15
<PAGE>   16
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

its consolidated financial condition, including capital adequacy, earnings,
liquidity, and, where appropriate, asset quality.

The following table provides information about CNFC's financial instruments that
are sensitive to changes in interest rates as of September 30, 2000. The
Corporation had no derivative financial instruments, or trading portfolio, as of
that date. The expected maturity date values for loans receivable,
mortgage-backed securities, and investment securities were calculated without
adjusting the instrument's contractual maturity date for expectations of
prepayments. Expected maturity date values for interest-bearing core deposits
were not based upon estimates of the period over which the deposits would be
outstanding, but rather the opportunity for repricing.

Principal/Notional Amount Maturing in:

<TABLE>
<CAPTION>
                                                                    (DOLLARS IN THOUSANDS)
                                     2000      2001      2002      2003       2004    THEREAFTER    TOTAL    FAIR VALUE
                                     ----      ----      ----      ----       ----    ----------    -----   -----------
<S>                                  <C>       <C>       <C>      <C>         <C>     <C>          <C>      <C>
RATE SENSITIVE ASSETS:
FIXED INTEREST RATE LOANS             $1,870   $10,282   $10,691  $ 19,978    $17,181    $ 36,555  $ 96,557     $ 94,911
             AVERAGE INTEREST RATE     8.31%     7.57%     8.81%     8.61%      8.32%       8.28%     8.34%
 VARIABLE INTEREST RATE LOANS          7,895    16,916     4,132     2,511      3,772      39,905    75,131       75,131
             AVERAGE INTEREST RATE    10.19%    10.24%     9.80%    10.28%     10.51%       8.34%     9.21%
FIXED INTEREST RATE SECURITIES           575     5,880     4,835     5,765      5,085       5,565    27,705       27,767
             AVERAGE INTEREST RATE     6.06%     5.94%     6.31%     6.24%      6.89%       7.35%     6.53%
EQUITY INVESTMENTS                       204                                                            204          294
             AVERAGE INTEREST RATE     3.76%                                                          3.76%
FHLB STOCK                             1,391                                                          1,391        1,391
             AVERAGE INTEREST RATE     8.50%                                                          8.50%
FEDERAL FUNDS SOLD                     1,200                                                          1,200        1,200
             AVERAGE INTEREST RATE     6.64%                                                          6.64%

RATE SENSITIVE LIABILITIES:
NON INTEREST BEARING DEMAND           17,946                                                         17,946       17,946
INTEREST BEARING DEMAND               25,910                                                         25,910       25,910
             AVERAGE INTEREST RATE     1.73%                                                          1.73%
SAVINGS                               41,443                                                         41,443       41,443
             AVERAGE INTEREST RATE     2.82%                                                          2.82%
TIME DEPOSITS                         22,938    35,588     8,273     3,957        969         498    72,223       72,870
             AVERAGE INTEREST RATE     5.86%     6.17%     5.99%     6.16%      5.62%       5.57%     6.04%
REPURCHASE AGREEMENTS                  7,390                                                          7,390        7,390
             AVERAGE INTEREST RATE     5.85%                                                          5.85%
U.S. TREASURY DEMAND NOTES               737                                                            737          737
             AVERAGE INTEREST RATE     5.95%                                                          5.95%
FIXED RATE FHLB ADVANCES               1,000     2,000               2,500      1,000       6,000    12,500       12,168
             AVERAGE INTEREST RATE     6.03%     6.63%               6.18%      7.01%       7.13%     6.76%
VARIABLE RATE FHLB ADVANCE             6,000     3,000                                      2,000    11,000       10,960
             AVERAGE INTEREST RATE     6.65%     6.65%                                      7.24%     6.76%

</TABLE>


                                       16
<PAGE>   17
                   COMMERCIAL NATIONAL FINANCIAL CORPORATION



Forward Looking Statements
This discussion and analysis of financial condition and results of operations,
and other sections of this report contain forward looking statements that are
based on management's beliefs, assumptions, current expectations, estimates and
projections about the financial services industry, the economy, and about the
Corporation itself. Words such as "anticipates", "believes", "estimates",
"expects" "forecasts" "intends", "is likely", "plans", "product", "projects",
variations of such words and similar expressions are intended to identify such
forward-looking statements. These statements are not guarantees of future
performance and involve certain risks, uncertainties, and assumptions ("Future
Factors") that are difficult to predict with regard to timing, extent,
likelihood and degree of occurrence. Therefore, actual results and outcomes may
materially differ from what may be expressed or forecasted in such forward
looking statements. Furthermore, CNFC undertakes no obligation to update, amend
or clarify forward-looking statements, whether as a result of new information,
future events, or otherwise.

Future Factors include changes in interest rates and interest rate
relationships; demand for products and services; the degree of competition by
traditional and non-traditional competitors; changes in banking regulations and
tax laws; changes in prices, levies, and assessments; the impact of technology,
governmental and regulatory policy changes; the outcome of pending and future
litigation and contingencies; trends in customer behavior including their
ability to repay loans; and vicissitudes of the national and local economies.
These are representative of the Future Factors that could cause a difference
between an actual outcome and a forward-looking statement.



                                       17
<PAGE>   18
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION


                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

PART II.                                               OTHER INFORMATION
Item 6 (a)                                             Exhibit 27 Financial Data
Item 6 (b)                                             Reports on Form 8-K  None




                                       18
<PAGE>   19
                    COMMERCIAL NATIONAL FINANCIAL CORPORATION



                    COMMERCIAL NATIONAL FINANCIAL CORPORATION

SIGNATURES


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


                                    Commercial National Financial Corporation
                                                   (Registrant)
Date: November 1, 2000

                                    /s/ Jeffrey S. Barker
                                    Jeffrey S. Barker
                                    President and Chief Executive Officer


                                    /s/ Patrick G. Duffy
                                    Patrick G. Duffy
                                    Executive Vice President and Chief Financial
                                    Officer






                                       19

<PAGE>   20



                                 Exhibit Index

<TABLE>
<CAPTION>
Exhibit No.                     Description
-----------                     -----------
<S>                             <C>
    27                          Financial Data Schedule
</TABLE>