Document:

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                                                                   Exhibit 10.26

                               LICENSE AGREEMENT

        This LICENSE AGREEMENT (the "Agreement") effective as of July 30, 1999
(the Effective Date"), is made by and between XCYTE Therapies, Inc., a Delaware
corporation having a principal place of business at 2203 Airport Way South,
Suite 300, Seattle, Washington 98134 ("XCYTE") and Genecraft LLC, a Washington
limited liability company having a principal place of business at 18798
Ridgefield Road N.W., Shoreline, Washington 98177 ("Genecraft").

BACKGROUND

        XCYTE owns certain Patent Applications (as defined below) and Genecraft
desires to obtain an exclusive license to such Patent Applications in the
Genecraft Field of Use and XCYTE desires to grant such a license to Genecraft.

        NOW THEREFORE, for and in consideration of the mutual covenants and
promises herein contained, the parties hereto agree as follows:

1.      DEFINITIONS

        1.1 "Biological Materials" shall mean the biological materials listed on
Exhibit A attached hereto.

        1.2 "Confidential Information" shall mean (i) any proprietary or
confidential information or material in tangible form disclosed hereunder that
is marked as "Confidential" at the time it is delivered to the receiving party,
or (ii) proprietary or confidential information disclosed orally hereunder which
is Identified as confidential or proprietary when disclosed and such disclosure
of confidential information is confirmed in writing within thirty (30) days by
the disclosing party.

        1.3 "Genecraft Field of Use" shall mean all areas other than the
Retained Field of Use, including, but not limited to, soluble multifunctional
molecules.

        1.4 "Materials" shall mean the Biological Materials, the Notebooks,
Patent Applications and related drawings, diagrams and other materials.

        1.5 "Net Sales" shall mean the gross billed or invoiced amounts for
Products, whether billed or invoiced by Genecraft or its affiliates or
sublicensee, less the following deductions for amounts actually incurred:

        (a) normal, customary trade discounts (including volume discounts),
credits and rebates and allowances and adjustments for rejections, recalls or
returns allowed and actually taken; and

*Certain information on this page has been omitted and filed
 separately with the Commission. Confidential treatment has
 been requested with respect to the omitted portions.

<PAGE>   2

        (b) freight, insurance, sales, use, excise, value-added and similar
taxes or duties imposed on the sales and included in the gross amount charged;

provided, however, that the aggregate value of said deductions (a) and (b) above
in any royalty payment period shall not exceed 15% of the gross amount billed or
invoiced for that period.

        Products used in clinical trials of the safety or efficacy of Product
shall not be included as Product sold under the definition of Net Sales;
provided the Product is supplied to the user at no cost.

        1.6 "Notebooks" shall mean copies of the laboratory research notebooks
listed on Exhibit B attached hereto.

        1.7 "Patent Applications" shall mean U.S. patent application 60/075,274
and 60/108,683 such patent application to incorporate by this reference all
divisional and/or continuing applications)), attached hereto as Exhibit C. and
all inventions, processes and compositions of matter reflected therein.

        1.8 "Product" shall mean any product that Incorporates the Materials and
is covered by a Valid Claim.

        1.9 "Retained Field of Use" shall mean solid surface ex-vivo
applications for expanding cells.

        1.10   "Term" shall mean the period defined in Section 9.1.

        1.11   "Territory" shall mean the entire world.

        1.12 "Valid Clams" shall mean a claim of an issued and unexpired patent
included within the Patent Applications which has not been held invalid or
unenforceable by a court or other governmental agency of competent jurisdiction,
from which no appeal has been or can be taken and which has not been admitted to
be invalid or unenforceable through reissue, disclaimer or otherwise.

2.      PRODUCTION OF MATERIALS

        2.1 License Grant. XCYTE hereby grants to Genecraft a worldwide,
exclusive license under the Patent Applications to grant and authorize
sublicenses, to create derivative works, to make, have made, import, have
imported, use, offer for sale, sell and otherwise distribute and exploit
Products in the Genecraft Field of Use in the Territory. Genecraft shall require
that all sublicensees enter into written agreements binding each sublicensee to
pay royalties due for such sublicense to XCYTE. Genecraft shall notify XCYTE in
writing within thirty (30) days of the granting of a sublicense pursuant to this
Section 2.1 of the name and address of the sublicensee and the type of
sublicense granted.

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        2.2 Production of Materials. XCYTE shall deliver copies of the Notebooks
listed in Exhibit B to Genecraft at the address listed in Section 10.5 below
within thirty (30) days of the Effective Date.

3.      ROYALTIES

        3.1 Royalties. In consideration for the Materials and the license
granted herein, Genecraft, its affiliates and sublicensees shall pay to XCYTE a
royalty consisting of [*] of all Net Sales up to and including a final payment
bringing the aggregate royalty payments under this Section 3.1 to [*]. Once
Genecraft has paid to XCYTE total royalties of [*], XCYTE shall be entitled to
receive ongoing royalties in the amount of [*] of Net Sales during the remainder
of the Term.

        3.2 Multiple License Product Royalties. In the event that a Product
incorporates technology licensed from a source other than XCYTE, the royalty to
be paid to XCYTE from Net Sales derived from the sale of such multiple license
Products shall be decreased ratably. Notwithstanding the foregoing, in no event
shall the royalty due and owing for such multiple license Products be decreased
below a minimum of 50% of the royalty otherwise due under Section 3.1.

        3.3 Sublicensing Revenue. Genecraft agrees to pay XCYTE [*] of
non-royalty consideration derived from any permitted sublicensing of the
Materials by Genecraft.

        3.4 Combination Products. In the event that a Product is used or sold by
Genecraft in combination as a single product or service with one or more other
product(s) or service(s) whose sale and/or use are not within the scope of the
this Agreement, and do not entail the use of Materials, Net Sales from such
sales and/or use for purposes of calculating the amounts due under Section 3.1
above shall be calculated by multiplying the Net Sales of that combination by
the fraction A/(A+B), where A is the gross selling price of the Product sold
separately and B is the gross selling price of the other product or service sold
separately. in the event that no such separate sales or use are made by
Genecraft, Net Sales for purposes of royalty determination shall be calculated
by multiplying the Net Sales of the combination (calculated using the standard
Net Sales definition) by the fraction C/C+D, where C is the fair market value of
the Product and D is the fair market value of the other products or services. in
such event, Genecraft shah in good faith make a determination of the respective
fair market values of the Product and the other products and services included
in the combination, and shall notify XCYTE of such determination and provide
XCYTE with data to support such determination. XCYTE shall have the right to
review such determination and supporting data, and to notify XCYTE if it
disagrees with such determination.

        3.5 Payment Term. The amounts due pursuant to this Article 3 shall be
payable on a country-by-country basis until the later of (i) [*] from the date
of first commercial sale of a Product in such country or (ii) the last to expire
Valid Claim covering the manufacture, use or sale of the Product in such
country.

4.      PAYMENTS: REPORTS AND RECORDS

*Certain information on this page has been omitted and filed
 separately with the Commission. Confidential treatment has
 been requested with respect to the omitted portions.

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        4.1 Timing of Payments; Payment Method. Genecraft agrees to pay all
amounts due to XCYTE within sixty (60) days of the last day of the calendar
quarter in which they accrue. Genecraft agrees to pay a late fee for any overdue
payment due XCYTE hereunder. The late fee shall be computed as the prime rate
plus two percent, as set forth by the Wall Street Journal on the date on which
such payment is due, of the outstanding, unpaid balance. The payment of such a
late fee shall not foreclose or limit XCYTE from exercising any other rights it
may have as a consequence of the lateness of any payment.

        4.2 Reports. Genecraft shall deliver to XCYTE within sixty (60) days
after the end of each calendar quarter in which amounts have become due a report
setting forth in reasonable detail the calculation of the amounts payable to
XCYTE for such calendar quarter, including the sales of Products and all amounts
received from sublicenses of the Materials. Such reports shall be Confidential
Information of Genecraft subject to Article 5 herein.

        4.3 Currency; Foreign Payments. All payments due hereunder shall be paid
in United States dollars. If any currency conversion shall be required in
connection with the payment of any amounts hereunder, such conversion shall be
made by using the exchange rate for the purchase of U.S. dollars reported by the
Bank of America on the last business day of the calendar quarter to which such
payments relate, if at any time legal restrictions prevent the prompt remittance
of any amounts owed in any jurisdiction, Genecraft may notify XCYTE and make
such payments by depositing the amount thereof in local currency in a bank
account or other depository in such country in the name of XCYTE, and Genecraft
shall have no further obligations under this Agreement with respect thereto.

        4.4 Inspection of Books and Records. Genecraft shall maintain accurate
books and records which enable the calculation of amounts payable hereunder to
be verified. Genecraft shall retain the books and records for each quarterly
period for three (3) years after the submission of the corresponding report
under Section 4.2 hereof. Upon thirty (30) days prior notice to Genecraft,
independent accountants selected by XCYTE, reasonably acceptable to Genecraft,
after entering into a confidentiality agreement with Genecraft, may have access
to Genecraft's books and records to conduct a review or audit once per calendar
year, for the sole purpose of verifying the accuracy of Genecraft's payments and
compliance with this Agreement. The accounting firm shall report to XCYTE only
whether there has been an underpayment and, if so, the amount thereof. Such
access shall be permitted during Genecraft's normal business hours during the
term of this Agreement and for three (3) years after the expiration or
termination of this Agreement. Any such inspection or audit shall be at XCYTE's
expense, however, in the event that an inspection reveals an underpayment of ten
percent (10%) or more in any audit period, Genecraft shall pay the costs of the
inspection and promptly pay to XCYTE any underpayment with interest from the
date such amount(s) were due, at the prime rate reported by the Chase Manhattan
Bank, New York, New York.

        4.5 Taxes. All amounts required to be paid to XCYTE pursuant to this
Agreement may be paid with deduction for withholding for or on account of any
taxes (other than taxes imposed on or measured by net Income) or similar
government charge imposed by a Jurisdiction other than the United States
("Withholding Taxes"). At XCYTE's request, Genecraft shall

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provide XCYTE a certificate evidencing payment of any Withholding Taxes
hereunder and shall reasonably assist XCYTE to obtain the benefit of any
applicable tax treaty.

5.      CONFIDENTIALITY

        5.1 Confidential Information. Except as expressly provided herein or as
required by law, the parties agree that, for the term of this Agreement and for
five (5) years thereafter, the receiving party shall keep completely
confidential and shall not publish or otherwise disclose and shall not use for
any purpose except for the purposes contemplated by this Agreement any
Confidential Information furnished to it by the disclosing party hereto pursuant
to this Agreement, except that to the extent that it can be established by the
receiving party by competent proof that such Confidential Information:

               (i) was already known to the receiving party, other than under an
obligation of confidentiality, at the time of disclosure;

               (ii) was generally available to the public or otherwise part of
the public domain at the time of its disclosure to the receiving party;

               (iii) became generally available to the public or otherwise part
of the public domain after its disclosure and other than through any act or
omission of the receiving party in breach of this Agreement;

               (iv) was independently developed by the receiving party without
reference to the Confidential Information as demonstrated by documented evidence
prepared contemporaneously with such independent development; or

               (v) was subsequently lawfully disclosed to the receiving party by
a person other than a party hereto.

        5.2 Permitted Use and Disclosures. Each party hereto may use or disclose
information disclosed to it by the other party to the extent such use or
disclosure is reasonably necessary in preparing and filing grant applications,
preparing scientific and/or scholarly works, filing or prosecuting patent
applications, prosecuting or defending litigation, complying with applicable
governmental regulations or otherwise submitting information to tax or other
governmental authorities, conducting clinical trials, or making a permitted
sublicense, provided that if a party is required to make any such disclosure of
another party's Confidential Information, other than pursuant to a
confidentiality agreement, it will give reasonable advance notice to the latter
party of such disclosure and, save to the extent inappropriate in the case of
patent applications, will use its best efforts to secure confidential treatment
of such information prior to its disclosure (whether through protective orders
or otherwise).

        5.3 Disclosure Notification. Prior to the submission by Genecraft of
scientific and/or scholarly works pursuant to Section 5.2 Genecraft shall
provide XCYTE with a copy of the proposed submission for XCYTE's review. Such
review shall be for the purposes of determining whether patent applications
shall need to be prepared for the research discussed in the

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submission. XCYTE shall have thirty (30) days, or such lesser amount of time as
mutually agreed upon by the parties, to review the proposed submission. The
purposes of the review shall be solely for determining the necessity of
preparing patent applications and XCYTE shall have no rights to prevent
submission of such scientific and/or scholarly works.

6.      PATENT PROSECUTION AND ENFORCEMENT

        6.1 Genecraft's Rights. Genecraft shall have the sole right, at its
expense, to control the preparation, filing, prosecution and maintenance of
patent applications based upon the Materials in the Genecraft Field of Use, and
any interference or opposition proceeding relating thereto, using patent counsel
of its choice. XCYTE agrees to provide reasonable assistance to facilitate
Genecraft's efforts to prosecute patents based upon the Patent Applications of
Genecraft's expense.

        6.2 XCYTE's Rights. XCYTE shall have the sole right, at its expense, to
control the preparation, filing, prosecution and maintenance of patent
applications based upon the Materials in the Retained Field of Use, and any
interference or opposition proceeding relating thereto, using patent counsel of
its choice. Genecraft agrees to provide reasonable assistance to facilitate
XCYTE's efforts to prosecute patents based upon the Patent Applications at
XCYTE's expense.

        6.3 Infringement Claims. If the practice by Genecraft of the rights
granted herein results in any allegation or claim of infringement of an
intellectual property right of a third party against Genecraft or a sublicensee,
Genecraft shall give XCYTE notice of such infringement claim and Genecraft shall
have the exclusive right to defend any such claim, suit or proceeding, at its
own expense, by counsel of its own choice and shall have the sole right and
authority to settle any such suit; provided, however, XCYTE shall cooperate with
Genecraft, at Genecraft's reasonable request and expense, in connection with the
defense of such claim; and provided further that XCYTE shall have the right, at
its own expense, to be represented in such action by counsel of its own choice.
Genecraft shall be entitled to offset reasonable costs and expenses (including
attorneys' and professional fees) incurred in connection with any such
proceeding against up to fifty percent (50%) of the royalty amounts it would
otherwise owe to XCYTE under Article 3.1.

        6.4 Cooperation. At any time or from time to time on and after the date
of this Agreement, XCYTE shall at the request of Genecraft (i) deliver to
Genecraft such records, data or other documents consistent with the provisions
of this Agreement, (ii) execute, and deliver or cause to be delivered, all such
consents, documents or further instruments of transfer or license, and (iii)
take or cause to be taken all such actions, as Genecraft may reasonably deem
necessary or desirable in order for Genecraft to obtain the full benefits of
this Agreement and the transactions contemplated hereby.

7.      REPRESENTATIONS AND WARRANTIES

        7.1 XCYTE. XCYTE represents and warrants that: (i) it is a corporation
duly organized validly existing and in good standing under the laws of the State
of Delaware; (ii) the execution, delivery and performance of this Agreement have
been duly authorized by all

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<PAGE>   7

necessary corporate action on the part of XCYTE; (iii) it has the right to grant
the rights and licenses granted herein; and (iv) to its knowledge, there are no
threatened or pending actions, suits, investigations. claims or proceedings
relating to any of the Materials. Notwithstanding the foregoing, with respect to
the Biological Materials, XCYTE only represents and warrants that It is granting
and licensing to Genecraft only the rights which XCYTE has in such Biological
Materials.

        7.2 Genecraft. Genecraft represents and warrants that (i) it is a
limited liability company duly organized and validly existing and in good
standing under the laws of the State of Washington; and (ii) the execution,
delivery and performance of this Agreement have been duly authorized by all
necessary action on the part of Genecraft.

        7.3 Disclaimer. EXCEPT FOR THE WARRANTIES SET FORTH IN SECTION 7.1 AND
7.2, THE PARTIES HEREBY WAIVE, RELEASE AND DISCLAIM, ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE; IMPLIED WARRANTY ARISING
FROM COURSE OF PERFORMANCE, COURSE OF DEALING OR USAGE OF TRADE; ANY OBLIGATION,
LIABILITY, RIGHT, REMEDY OR CLAIM IN TORT (INCLUDING NEGLIGENCE, WHETHER ACTIVE,
PASSIVE OR IMPUTED), PRODUCT LIABILITY, STRICT LIABILITY OR OTHER THEORY.

8.      INDEMNIFICATION; LIMITATION OF LIABILITY

        8.1 Genecraft. Genecraft shall and shall obligate its affiliates and
sublicensees, if any, to, indemnify, defend and hold harmless XCYTE and its
respective directors, officers and employees (each an "Indemnitee") from and
against any and all liabilities, damages, losses, costs or expenses (including
reasonable attorneys' and professionals' fees and other expenses of litigation
and/or arbitration (a "Liability") resulting from a claim, suit or proceeding
brought by a third party against an Indemnitee, arising out of Genecraft's
manufacture, use, distribution or sale of the Materials or Products or any
misrepresentation with regard to, or breach of, any of the representations and
warranties of Genecraft set forth in Section 7.2.

        8.2 XCYTE. XCYTE shall indemnify, defend and hold harmless Genecraft and
its directors, officers and employees (each an Indemnitee) from and against any
and all liabilities, damages, losses, costs or expenses (including reasonable
attorneys' and professionals' fees and other expenses of litigation and/or
arbitration (a "Liability")) resulting from a claim, suit or proceeding brought
by a third party against an Indemnitee, arising out of or in connection with any
misrepresentation with regard to, or a breach of, any of the representations and
warranties of XCYTE set forth in Section 7.1.

        8.3 Procedure. In the event that any Indemnitee intends to claim
indemnification under this Article 8 it shall promptly notify the indemnifying
party in writing of such alleged Liability. The Indemnifying party shall have
the right to control the defense and settlement thereof. The Indemnitee shall
cooperate with the Indemnifying party and its legal representatives in the
investigation of any action, claim or liability covered by this Article 3. The
Indemnity

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shall not, except at its own cost, voluntarily make any payment or incur any
expense with respect to any claim or suit without the prior written consent of
the indemnifying party, which the indemnifying party shall not be required to
give.

        8.4 Limitation of Liability. NEITHER PARTY SHALL BE LIABLE TO THE OTHER
FOR ANY SPECIAL, CONSEQUENTIAL INCIDENTAL OR INDIRECT DAMAGES ARISING OUT OF
THIS AGREEMENT WHETHER ARISING IN CONTRACT, WARRANTY, TORT (INCLUDING
NEGLIGENCE, WHETHER ACTIVE, PASSIVE OR IMPUTED), PRODUCT LIABILITY, STRICT
LIABILITY OR ANY OTHER THEORY OF LIABILITY.

        8.5 Insurance. Upon the earlier of any; (a) testing or use in human
subjects or (b) sale of a Product, Genecraft will put in place, and have XCYTE
named as an additional insured on, product liability insurance policies, with
limits consistent with sound business practice. Any termination of such policies
shall be a material breach of this Agreement. Genecraft shall provide XCYTE with
written evidence of the insurance and a copy of the policy upon request.

9.      TERM AND TERMINATION

        9.1 Term. The Term of this Agreement shall commence on the Effective
Date and shall continue in full force and effect until the payment obligations
of Genecraft under Section 3 terminate subject to earlier termination pursuant
to Section 9.2, 9.3 or 9.5. Upon expiration of Genecraft's payment obligations,
Genecraft shall have non-exclusive, perpetual fully-paid license under the
Patent Applications in the Genecraft Field of Use.

        9.2 Breach. Failure by either party to comply with any of the material
obligations contained in this Agreement shall entitle the other Party (the
"Non-defaulting Party") to give the party (the "Defaulting Party") in default
written notice specifying the nature of the default and requiring it to make
good such default. If such default is not cured within sixty (60) days after the
receipt of such notice, the Non-Defaulting Party shall be entitled, without
prejudice to any other rights conferred on it by this Agreement and in addition
to any other remedies available to it by law or in equity, immediately to
terminate this Agreement by giving written notice to the Defaulting Party. The
right of a party to terminate this Agreement, as hereinafter provided, shall not
be affected in any way by its waiver or failure to take action with respect to
any previous default.

        9.3 Insolvency or Bankruptcy. Either party may, in addition to any other
remedies available to it by law or in equity, terminate this Agreement effective
on written notice to the other party in the event the other party shall have
become insolvent or bankrupt, or shall have made an assignment for the benefit
of its creditors, or there shall have been appointed a trustee or receiver of
the other party or for all or a substantial part of its property, or any case or
proceeding shall have been commenced or other action taken by or against the
other party in bankruptcy or seeking reorganization, liquidation, dissolution,
winding-up, arrangement, composition or readjustment of its debts or any other
relief under any bankruptcy, insolvency, reorganization or other similar act or
law of any jurisdiction now or hereafter in effect, or there shall have been
Issued a warrant of attachment, execution, restraint or similar process against
any substantial

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<PAGE>   9

party of the property of the other party, and any such event shall have
continued for ninety (90) days undismissed, unbonded and undischarged.

        9.4 Failure to Exploit. In the event that Genecraft does not (A) either:
(i) receive funding to support the development and commercialization of the
Materials in the Genecraft Field of Use or (ii) create corporate partnerships,
strategic alliances or other relationships intended to financially support the
development and commercialization of the Materials in the Genecraft Field of Use
prior to the expiration of three (3) years from the data of this Agreement and
(B) file an IND covering a Product prior to expiration of eight (8) years from
the date of this Agreement, then XCYTE shall have the right, in its sole
discretion, to terminate the license granted pursuant to Section 2.1 and all
rights to and in the Materials shall revert to XCYTE.

        9.5 Survival. Sections 6. 2 and 6.3, and Articles 5, 7, 8 and 10 of this
Agreement shall survive termination of this Agreement for any reason.

10.     MISCELLANEOUS

        10.1 Governing Law; Venue. This Agreement shall be interpreted,
construed and enforced in all respects in accordance with the laws of the State
of Washington, without reference to its rules relating to choice of laws.

        10.2 Independent Contractors. The relationship of the parties hereto is
that of independent contractors. The parties hereto are not deemed to be agents,
partners or joint venturers of the other for any purpose as a result of the
Agreement or the transactions contemplated thereby.

        10.3 Assignment. Neither party shall assign any of its rights or
obligations hereunder except: (a) as incident to the merger, consolidation,
reorganization or acquisition of stock or assets affecting substantially all of
the assets or voting control of the assigning party; (b) to any wholly owned
subsidiary if the assigning party remains liable and responsible for the
performance and observance of all of the subsidiary's duties and obligations
hereunder; or (c) with the prior written consent of the other party (which
consent shall not be unreasonably withheld). This Agreement shall be binding
upon the successors and permitted assigns of the parties, and the name of a
party appearing herein shall be deemed to include the names of such party's
successors and permitted assigns to the extent necessary to carry out the intent
of this Agreement. Any assignment not in accordance with this Section 10.3 shall
be void.

        10.4 Right to Independently Develop. Nothing in this Agreement will
impair Genecraft's right to independently acquire, license, develop for itself,
or have others develop for it, technology or intellectual property performing
the same or similar functions as the Patent Applications or to market and
distribute Products based on such other intellectual property and technology.

        10.5 Notices. Any notice or communication required or permitted to be
given by either party hereunder, shall be deemed sufficiently given, if mailed
by certified mail, return receipt requested, and addressed to the party to whom
notice is given as follows:

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<PAGE>   10

If to Genecraft, to:                        If to XCYTE, to:
Genecraft LLC                               XCYTE Therapies, Inc.
18798 Ridgefield Rd. N.W.                   2203 Airport Way South. Suite 300
Shoreline, WA 98177                         Seattle, WA 98134
Attn: Jeffrey A. Ledbetter                  Attn:  Ron Berenson

        10.6 Force Majeure. Neither party shall lose any rights hereunder or be
liable to the other party for damages or losses (except for payment obligations)
on account of failure of performance by the defaulting party if the failure is
occasioned by war, strike, fire, Act of God, earthquake, flood, lockout,
embargo, governmental acts or orders or restrictions, failure of suppliers, or
any other reason where failure to perform is beyond the reasonable control and
not caused by the negligence, intentional conduct or misconduct of the
nonperforming party has exerted all reasonable efforts to avoid or remedy such
force majeure; provided, however, that in no event shall a party be required to
settle any labor dispute or disturbance.

        10.7 Compliance With Laws. Each party shall furnish to the other party
any information requested or required by that party during the term of this
Agreement or any extensions hereof to enable that party to comply with the
requirements of any U.S. or foreign federal, state and/or government agency.

        10.8 Severability. In the event that any provisions of this Agreement
are determined to be invalid or unenforceable by a court of competent
jurisdiction, the remainder of the Agreement shall remain in full force and
effect without said provision. The parties shall in good faith negotiate a
substitute clause for any provision declared invalid or unenforceable which
shall most nearly approximate the intent of the parties in entering this
Agreement.

        10.11 Modification; Waiver. This Agreement may not be altered, amended
or modified in any way except by a writing signed by both parties. The failure
of a party to enforce any provision of the Agreement shall not be construed to
be a waiver of the right of such party to thereafter enforce that provision or
any other provision or right.

        10.12 Advice of Counsel. Each party has been advised by counsel with
regard to this Agreement.

        10.13 Headings. The headings of the paragraphs of this Agreement are
inserted for convenience only and shall not constitute a part hereof.

        10.14 Entire Agreement. This Agreement including its Exhibits, sets
forth the entire agreement and understanding of the parties with respect to the
subject matter hereof, and supersedes all prior discussions, agreements, and
writings in relating thereto.

        10.15 Counterparts. This Agreement may be executed in two counterparts,
each of which shall be deemed an original and which together shall constitute
one instrument.

        10.16 Public Announcements. Except as may otherwise be required by law
or regulation, neither party shall make any public announcement concerning this
Agreement or the

                                      -10-
<PAGE>   11

subject matter hereof without the prior consent of the other party unless the
nature of the information has been previously approved for disclosure, if the
nature of the information has been approved, this Section 10.16 will no longer
apply to that information.

        IN WITNESS WHEREOF, the parties hereto have executed this Agreement, in
duplicate originals, by their respective officers hereunto duly authorized, the
day and year herein written.

     Genecraft LLC                             XCYTE Therapies, Inc.

     By     /s/ Martha Hayden Ledbetter        By     /s/ Mark J. Murray
       ----------------------------------        -----------------------------
     Name:  Martha Hayden Ledbetter            Name:  Mark J. Murray
          -------------------------------           --------------------------
     Title:        Manager                     Title: V.P. Business Development
           ----------------------                     -------------------------

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<PAGE>   12

                                    EXHIBIT A

                              BIOLOGICAL MATERIALS

        [*]

*Certain information on this page has been omitted and filed
 separately with the Commission. Confidential treatment has
 been requested with respect to the omitted portions.

                                      -12-
<PAGE>   13

                                    EXHIBIT B

                                    NOTEBOOKS

        [*]

*Certain information on this page has been omitted and filed
 separately with the Commission. Confidential treatment has
 been requested with respect to the omitted portions.

                                      -13-<PAGE>   1

                                                                     EXHIBIT 4.1

                                    INDENTURE

                                     BETWEEN

                              GLACIER BANCORP, INC.

                                       AND

                            WILMINGTON TRUST COMPANY,

                              AS INDENTURE TRUSTEE

              ________% SUBORDINATED DEBENTURES DUE _________, 2031

                           DATED AS OF ________, 2001

<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
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<S>                                                                                        <C>
CROSS-REFERENCE TABLE.......................................................................vi

RECITALS.....................................................................................1

ARTICLE I. DEFINITIONS.......................................................................2

SECTION 1.1 DEFINITIONS OF TERMS.............................................................2

ARTICLE II. ISSUE, DESCRIPTION, TERMS, CONDITIONS, REGISTRATION AND EXCHANGE OF THE
DEBENTURES...................................................................................9

SECTION 2.1 DESIGNATION AND PRINCIPAL AMOUNT.................................................9

SECTION 2.2 MATURITY.........................................................................9

SECTION 2.3 FORM AND PAYMENT................................................................10

SECTION 2.4 INTEREST........................................................................10

SECTION 2.5 EXECUTION AND AUTHENTICATIONS...................................................11

SECTION 2.6 REGISTRATION OF TRANSFER AND EXCHANGE...........................................12

SECTION 2.7 TEMPORARY DEBENTURES............................................................13

SECTION 2.8 MUTILATED, DESTROYED, LOST OR STOLEN DEBENTURES.................................13

SECTION 2.9 CANCELLATION....................................................................14

SECTION 2.10 BENEFIT OF INDENTURE...........................................................14

SECTION 2.11 AUTHENTICATION AGENT...........................................................14

ARTICLE III. REDEMPTION OF DEBENTURES.......................................................15

SECTION 3.1 REDEMPTION......................................................................15

SECTION 3.2 SPECIAL EVENT REDEMPTION........................................................15

SECTION 3.3 OPTIONAL REDEMPTION BY COMPANY..................................................16

SECTION 3.4 NOTICE OF REDEMPTION............................................................16

SECTION 3.5 PAYMENT UPON REDEMPTION.........................................................17
</TABLE>

<PAGE>   3

<TABLE>
<S>                                                                                        <C>
SECTION 3.6 NO SINKING FUND.................................................................18

ARTICLE IV. EXTENSION OF INTEREST PAYMENT PERIOD............................................18

SECTION 4.1 EXTENSION OF INTEREST PAYMENT PERIOD............................................18

SECTION 4.2 NOTICE OF EXTENSION.............................................................19

SECTION 4.3 LIMITATION ON TRANSACTIONS......................................................19

ARTICLE V. PARTICULAR COVENANTS OF THE COMPANY..............................................20

SECTION 5.1 PAYMENT OF PRINCIPAL AND INTEREST...............................................20

SECTION 5.2 MAINTENANCE OF AGENCY...........................................................20

SECTION 5.3 PAYING AGENTS...................................................................20

SECTION 5.4 APPOINTMENT TO FILL VACANCY IN OFFICE OF TRUSTEE................................21

SECTION 5.5 COMPLIANCE WITH CONSOLIDATION PROVISIONS........................................21

SECTION 5.6 LIMITATION ON TRANSACTIONS......................................................22

SECTION 5.7 COVENANTS AS TO THE TRUST.......................................................22

SECTION 5.8 COVENANTS AS TO PURCHASES.......................................................23

SECTION 5.9 WAIVER OF USURY, STAY OR EXTENSION LAWS.........................................23

ARTICLE VI. DEBENTUREHOLDERS' LISTS AND REPORTS BY THE COMPANY AND THE TRUSTEE..............23

SECTION 6.1 COMPANY TO FURNISH TRUSTEE NAMES AND ADDRESSES OF DEBENTUREHOLDERS..............23

SECTION 6.2 PRESERVATION OF INFORMATION COMMUNICATIONS WITH DEBENTUREHOLDERS................23

SECTION 6.3 REPORTS BY THE COMPANY..........................................................24

SECTION 6.4 REPORTS BY THE TRUSTEE..........................................................25

ARTICLE VII. REMEDIES OF THE TRUSTEE AND DEBENTUREHOLDERS ON EVENT OF DEFAULT...............25

SECTION 7.1 EVENTS OF DEFAULT...............................................................25
</TABLE>

                                       ii
<PAGE>   4

<TABLE>
<S>                                                                                        <C>
SECTION 7.2 COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT BY TRUSTEE.................27

SECTION 7.3 APPLICATION OF MONEYS COLLECTED.................................................28

SECTION 7.4 LIMITATION ON SUITS.............................................................28

SECTION 7.5 RIGHTS AND REMEDIES CUMULATIVE; DELAY OR OMISSION NOT WAIVER....................29

SECTION 7.6 CONTROL BY DEBENTUREHOLDERS.....................................................29

SECTION 7.7 UNDERTAKING TO PAY COSTS........................................................30

SECTION 7.8 DIRECT ACTION; RIGHT OF SET-OFF.................................................30

ARTICLE VIII. FORM OF DEBENTURE AND ORIGINAL ISSUE..........................................31

SECTION 8.1 FORM OF DEBENTURE...............................................................31

SECTION 8.2 ORIGINAL ISSUE OF DEBENTURES....................................................31

ARTICLE IX. CONCERNING THE TRUSTEE..........................................................31

SECTION 9.1 CERTAIN DUTIES AND RESPONSIBILITIES OF THE TRUSTEE..............................31

SECTION 9.2 NOTICE OF DEFAULTS..............................................................32

SECTION 9.3 CERTAIN RIGHTS OF TRUSTEE.......................................................33

SECTION 9.4 TRUSTEE NOT RESPONSIBLE FOR RECITALS, ETC.......................................34

SECTION 9.5 MAY HOLD DEBENTURES.............................................................34

SECTION 9.6 MONEYS HELD IN TRUST............................................................34

SECTION 9.7 COMPENSATION AND REIMBURSEMENT..................................................34

SECTION 9.8 RELIANCE ON OFFICERS' CERTIFICATE...............................................35

SECTION 9.9 DISQUALIFICATION: CONFLICTING INTERESTS.........................................35

SECTION 9.10 CORPORATE TRUSTEE REQUIRED; ELIGIBILITY........................................35

SECTION 9.11 RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR..............................36

SECTION 9.12 ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.........................................37
</TABLE>

                                      iii
<PAGE>   5

<TABLE>
<S>                                                                                        <C>
SECTION 9.13 MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO BUSINESS....................37

SECTION 9.14 PREFERENTIAL COLLECTION OF CLAIMS AGAINST THE COMPANY..........................38

ARTICLE X. CONCERNING THE DEBENTUREHOLDERS..................................................38

SECTION 10.1 SECTION 10.1  EVIDENCE OF ACTION BY HOLDERS....................................38

SECTION 10.2 PROOF OF EXECUTION BY DEBENTUREHOLDERS.........................................38

SECTION 10.3 WHO MAY BE DEEMED OWNERS.......................................................39

SECTION 10.4 CERTAIN DEBENTURES OWNED BY COMPANY DISREGARDED................................39

SECTION 10.5 ACTIONS BINDING ON FUTURE DEBENTUREHOLDERS.....................................39

ARTICLE XI. SUPPLEMENTAL INDENTURES.........................................................40

SECTION 11.1 SUPPLEMENTAL INDENTURES WITHOUT THE CONSENTOF DEBENTUREHOLDERS.................40

SECTION 11.2 SUPPLEMENTAL INDENTURES WITH CONSENT OF DEBENTUREHOLDERS.......................41

SECTION 11.3 EFFECT OF SUPPLEMENTAL INDENTURES..............................................41

SECTION 11.4 DEBENTURES AFFECTED BY SUPPLEMENTAL INDENTURES.................................42

SECTION 11.5 EXECUTION OF SUPPLEMENTAL INDENTURES...........................................42

ARTICLE XII. SUCCESSOR CORPORATION..........................................................42

SECTION 12.1 COMPANY MAY CONSOLIDATE, ETC...................................................42

SECTION 12.2 SUCCESSOR CORPORATION SUBSTITUTED..............................................43

SECTION 12.3 EVIDENCE OF CONSOLIDATION, ETC.TO TRUSTEE......................................43

ARTICLE XIII. SATISFACTION AND DISCHARGE....................................................43

SECTION 13.1 SATISFACTION AND DISCHARGE OF INDENTURE........................................43

SECTION 13.2 DISCHARGE OF OBLIGATIONS.......................................................44

SECTION 13.3 DEPOSITED MONIES TO BE HELD IN TRUST...........................................44

SECTION 13.4 PAYMENT OF MONIES HELD BY PAYING AGENTS........................................45
</TABLE>

                                       iv
<PAGE>   6

<TABLE>
<S>                                                                                        <C>
SECTION 13.5 REPAYMENT TO COMPANY...........................................................45

ARTICLE XIV. IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS................45

SECTION 14.1 NO RECOURSE....................................................................45

ARTICLE XV. MISCELLANEOUS PROVISIONS........................................................46

SECTION 15.1 EFFECT ON SUCCESSORS AND ASSIGNS...............................................46

SECTION 15.2 ACTIONS BY SUCCESSOR...........................................................46

SECTION 15.3 SURRENDER OF COMPANY POWERS....................................................46

SECTION 15.4 NOTICES........................................................................46

SECTION 15.5 GOVERNING LAW..................................................................46

SECTION 15.6 TREATMENT OF DEBENTURES AS DEBT................................................46

SECTION 15.7 COMPLIANCE CERTIFICATES AND OPINIONS...........................................47

SECTION 15.8 PAYMENTS ON BUSINESS DAYS......................................................47

SECTION 15.9 CONFLICT WITH TRUST INDENTURE ACT..............................................47

SECTION 15.10 COUNTERPARTS..................................................................47

SECTION 15.11 SEPARABILITY..................................................................47

SECTION 15.12 ASSIGNMENT....................................................................48

SECTION 15.13 ACKNOWLEDGMENT OF RIGHTS......................................................48

ARTICLE XVI. SUBORDINATION OF DEBENTURES....................................................48

SECTION 16.1 AGREEMENT TO SUBORDINATE.......................................................48

SECTION 16.2 DEFAULT ON SENIOR DEBT, SUBORDINATED DEBT OR ADDITIONAL SENIOR OBLIGATIONS.....49

SECTION 16.3 LIQUIDATION; DISSOLUTION; BANKRUPTCY...........................................49

SECTION 16.4 SUBROGATION....................................................................50

SECTION 16.5 TRUSTEE TO EFFECTUATE SUBORDINATION............................................51

SECTION 16.6 NOTICE BY THE COMPANY..........................................................51
</TABLE>

                                       v
<PAGE>   7

<TABLE>
<S>                                                                                        <C>
SECTION 16.7 RIGHTS OF THE TRUSTEE; HOLDERS OF SENIOR INDEBTEDNESS..........................52

SECTION 16.8 SUBORDINATION MAY NOT BE IMPAIRED..............................................52
</TABLE>

                                       vi
<PAGE>   8

                              CROSS-REFERENCE TABLE

<TABLE>
<CAPTION>
     SECTION OF TRUST INDENTURE
      ACT TO 1939, AS AMENDED                            SECTION OF INDENTURE
      -----------------------                            --------------------
<S>                                                      <C>
               310(a)                                            9.10
               310(b)                                            9.9
                                                                 9.11
               310(c)                                       Not Applicable
               311(a)                                            9.14
               311(b)                                            9.14
               311(c)                                       Not Applicable
               312(a)                                            6.1
               312(b)                                           6.2(a)
                                                                6.2(c)
               312(c)                                           6.2(d)
               6.2(c)
               313(a)                                           6.4(a)
               313(b)                                           6.4(b)
               313(c)                                           6.4(a)
                                                                6.4(b)
               313(d)                                           6.4(c)
               314(a)                                           6.3(a)
                                                                6.3(b)
               314(b)                                       Not Applicable
               314(c)                                            15.7
               314(d)                                       Not Applicable
               314(e)                                            15.7
               314(f)                                       Not Applicable
               315(a)                                           9.1(a)
               315(b)                                            9.2
               315(c)                                           9.1(a)
               315(d)                                           9.1(b)
               315(e)                                            7.7
               316(a)                                            1.1
                                                                 7.6
               316(b)                                           7.4(b)
               316(c)                                          10.1(b)
               317(a)                                            7.2
               317(b)                                            5.3
               318(a)                                            15.9
</TABLE>

       Note: This reconciliation and tie sheet shall not, for any purpose,
                    be deemed to be a part of the Indenture.

                                      vii
<PAGE>   9

                                    INDENTURE

        THIS INDENTURE dated as of ________, 2001, is by and between GLACIER
BANCORP, INC., a Delaware corporation (the "Company") and WILMINGTON TRUST
COMPANY, a Delaware banking corporation with its principal place of business in
the State of Delaware (the "Trustee"):

                                    RECITALS

        WHEREAS, for its lawful corporate purposes, the Company has duly
authorized the execution and delivery of this Indenture to provide for the
issuance of securities to be known as its _____% Subordinated Debentures due
_______, 2031 (hereinafter referred to as the "Debentures"), the form and
substance of such Debentures and the terms, provisions and conditions thereof to
be set forth as provided in this Indenture;

        WHEREAS, Glacier Capital Trust I, a Delaware statutory business trust
(the "Trust"), has offered to the public up to $35,000,000 aggregate liquidation
amount of Trust Preferred Securities (as defined herein) and proposes to invest
the proceeds from such offering, together with the proceeds of the issuance and
sale by the Trust to the Company of up to $________ aggregate liquidation amount
of its Common Securities (as defined herein), in up to $___________ aggregate
principal amount of the Debentures;

        WHEREAS, the Company has requested that the Trustee execute and deliver
this Indenture;

        WHEREAS, all requirements necessary to make this Indenture a valid
instrument in accordance with its terms, and to make the Debentures, when
executed by the Company and authenticated and delivered by the Trustee, the
valid obligations of the Company, have been performed, and the execution and
delivery of this Indenture have been duly authorized in all respects;

        WHEREAS, to provide the terms and conditions upon which the Debentures
are to be authenticated, issued and delivered, the Company has duly authorized
the execution of this Indenture; and.

        WHEREAS, all things necessary to make this Indenture a valid agreement
of the Company, in accordance with its terms, have been done.

        NOW, THEREFORE, in consideration of the premises and the purchase of the
Debentures by the holders thereof, it is mutually covenanted and agreed as
follows for the equal and ratable benefit of the holders of the Debentures:

<PAGE>   10

                                   ARTICLE I.

                                   DEFINITIONS

SECTION 1.1 DEFINITIONS OF TERMS.

        The terms defined in this Section 1.1 (except as in this Indenture
otherwise expressly provided or unless the context otherwise requires) for all
purposes of this Indenture and of any indenture supplemental hereto shall have
the respective meanings specified in this Section 1.1 and shall include the
plural as well as the singular. All other terms used in this Indenture that are
defined in the Trust Indenture Act, or that are by reference in the Trust
Indenture Act defined in the Securities Act (except as herein otherwise
expressly provided or unless the context otherwise requires), shall have the
meanings assigned to such terms in the Trust Indenture Act and in the Securities
Act as in force at the date of the execution of this instrument. All accounting
terms used herein and not expressly defined shall have the meanings assigned to
such terms in accordance with Generally Accepted Accounting Principles.

        "Accelerated Maturity Date" means if the Company elects to accelerate
the Maturity Date in accordance with Section 2.2(b), the date selected by the
Company which is prior to the Scheduled Maturity Date, but is not earlier than
__________, 2006.

        "Additional Payments" shall have the meaning set forth in Section 2.4.

        "Additional Senior Obligations" means all indebtedness of the Company
whether incurred on or prior to the date of this Indenture or thereafter
incurred, for claims in respect of financial derivative products such as
interest and foreign exchange rate contracts, commodity contracts and similar
arrangements; provided, however, that Additional Senior Obligations does not
include claims in respect of Senior Debt or Subordinated Debt or obligations
which, by their terms, are expressly stated to be not superior in right of
payment to the Debentures or to rank pari passu in right of payment with the
Debentures. For purposes of this definition, "claim" shall have the meaning
assigned thereto in Section 101(4) of the United States Bankruptcy Code of 1978,
as amended.

        "Administrative Trustees" shall have the meaning set forth in the Trust
Agreement.

        "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

        "Authenticating Agent" means any Person authorized by the Trustee
pursuant to Section 2.11 to authenticate Debentures.

        "Bankruptcy Law" means Title 11, U.S. Code, or any similar federal or
state law for the relief of debtors.

                                       2
<PAGE>   11

        "Board of Directors" means the Board of Directors of the Company or any
duly authorized committee of such Board or any other duly designated officers of
the Company.

        "Board Resolution" means a copy of a resolution certified by the
Secretary or an Assistant Secretary of the Company to have been duly adopted by
the Board of Directors and to be in full force and effect on the date of such
certification.

        "Business Day" means, with respect to the Debentures, any day other than
a Saturday or a Sunday or a day on which federal or state banking institutions
in the State of Montana or Wilmington, Delaware are authorized or required by
law, executive order or regulation to close, or a day on which the Corporate
Trust Office of the Trustee or the Property Trustee is closed for business.

        "Capital Treatment Event" means the receipt by the Company and the Trust
of an Opinion of Counsel, rendered by a law firm having a recognized national
bank regulatory practice, to the effect that, as a result of any amendment to,
or change (including any announced prospective change) in, the laws (or any
regulations there under) of the United States or any political subdivision
thereof or therein, or as a result of any official or administrative
pronouncement or action or judicial decision interpreting or applying such laws
or regulations, which amendment or change is effective or which pronouncement or
decision is announced on or after the date of issuance of the Trust Preferred
Securities under the Trust Agreement, there is more than an insubstantial risk
of impairment of the Company's ability to treat the Trust Preferred Securities
(or any substantial portion thereof) as Tier 1 capital (or the then equivalent
thereof), for purposes of the capital adequacy guidelines of the Federal
Reserve, as then in effect and applicable to the Company; provided, however,
that the Trust or the Company shall have requested and received such an Opinion
of Counsel with regard to such matters within a reasonable period of time after
the Trust or the Company shall have become aware of the possible occurrence of
any such event.

        "Change in 1940 Act Law" shall have the meaning set forth in the
definition of "Investment Company Event."

        "Commission" means the Securities and Exchange Commission, as from time
to time constituted, created under the Exchange Act, or, if at any time after
the execution of this instrument such Commission is not existing and performing
the duties now assigned to it under the Trust Indenture Act, then the body
performing such duties at such time.

        "Common Securities" means undivided beneficial interests in the assets
of the Trust which rank pari passu with the Trust Preferred Securities;
provided, however, that upon the occurrence of an Event of Default, the rights
of holders of Common Securities to payment in respect of distributions and
payments upon liquidation, redemption and otherwise are subordinated to the
rights of holders of Trust Preferred Securities.

        "Company" means Glacier Bancorp, Inc., a corporation duly organized and
existing under the laws of the State of Delaware, and, subject to the provisions
of Article XII, shall also include its successors and assigns.

        "Compounded Interest" shall have the meaning set forth in Section 4.1.

                                       3
<PAGE>   12

        "Corporate Trust Office" means the office of the Trustee at which, at
any particular time, its corporate trust business shall be principally
administered, which office at the date hereof is located at Rodney Square North,
1100 North Market Street, Wilmington, Delaware 19890-0001, Attention: Corporate
Trust Administration.

        "Coupon Rate" shall have the meaning set forth in Section 2.4.

        "Custodian" means any receiver, trustee, assignee, liquidator, or
similar official under any Bankruptcy Law.

        "Debentures" shall have the meaning set forth in the Recitals hereto.

        "Debentureholder," "holder of Debentures," "registered holder," or other
similar term, means the Person or Persons in whose name or names a particular
Debenture shall be registered on the books of the Company or the Trustee kept
for that purpose in accordance with the terms of this Indenture.

        "Debenture Register" shall have the meaning set forth in Section 2.6(b).

        "Debt" means with respect to any Person, whether recourse is to all or a
portion of the assets of such Person and whether or not contingent, (i) every
obligation of such Person for money borrowed; (ii) every obligation of such
Person evidenced by bonds, debentures, notes or other similar instruments,
including obligations incurred in connection with the acquisition of property,
assets or businesses; (iii) every reimbursement obligation of such Person with
respect to letters of credit, bankers' acceptances or similar facilities issued
for the account of such Person; (iv) every obligation of such Person issued or
assumed as the deferred purchase price of property or services (but excluding
trade accounts payable or accrued liabilities arising in the ordinary course of
business); (v) every capital lease obligation of such Person; and (vi) and every
obligation of the type referred to in clauses (i) through (v) of another Person
and all dividends of another Person the payment of which, in either case, such
Person has guaranteed or is responsible or liable, directly or indirectly, as
obligor or otherwise.

        "Default" means any event, act or condition that with notice or lapse of
time, or both, would constitute an Event of Default.

        "Deferred Payment" shall have the meaning set forth in Section 4.1.

        "Dissolution Event" means that as a result of the occurrence and
continuation of a Special Event, the Trust is to be dissolved in accordance with
the Trust Agreement and the Debentures held by the Property Trustee are to be
distributed to the holders of the Trust Securities issued by the Trust pro rata
in accordance with the Trust Agreement.

        "Event of Default" means, with respect to the Debentures, any event
specified in Section 7.1, which has continued for the period of time, if any,
and after the giving of the notice, if any, therein designated.

        "Exchange Act," means the Securities Exchange Act of 1934, as amended,
as in effect at the date of execution of this instrument.

                                       4
<PAGE>   13

        "Extended Interest Payment Period" shall have the meaning set forth in
Section 4.1.

        "Federal Reserve" means the Board of Governors of the Federal Reserve
System.

        "Generally Accepted Accounting Principles" means such accounting
principles as are generally accepted at the time of any computation required
hereunder.

        "Global Guarantee" means any guarantee that the Company may enter into
with the Trustee or other Persons that operate directly or indirectly for the
benefit of holders of Securities.

        "Governmental Obligations" means securities that are (i) direct
obligations of the United States of America for the payment of which its full
faith and credit is pledged; or (ii) obligations of a Person controlled or
supervised by and acting as an agency or instrumentality of the United States of
America, the payment of which is unconditionally guaranteed as a full faith and
credit obligation by the United States of America that, in either case, are not
callable or redeemable at the option of the issuer thereof, and shall also
include a depositary receipt issued by a bank (as defined in Section 3(a)(2) of
the Securities Act) as custodian with respect to any such Governmental
Obligation or a specific payment of principal of or interest on any such
Governmental Obligation held by such custodian for the account of the holder of
such depositary receipt; provided, however, that (except as required by law)
such custodian is not authorized to make any deduction from the amount payable
to the holder of such depositary receipt from any amount received by the
custodian in respect of the Governmental Obligation or the specific payment of
principal of or interest on the Governmental Obligation evidenced by such
depositary receipt.

        "Herein," "hereof," and "hereunder," and other words of similar import,
refer to this Indenture as a whole and not to any particular Article, Section or
other subdivision.

        "Indenture" means this instrument as originally executed or as it may
from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into in accordance with the terms hereof.

        "Interest Payment Date," when used with respect to any installment of
interest on the Debentures, means the date specified in the Debenture or in an
indenture supplemental hereto with respect to the Debentures as the fixed date
on which an installment of interest with respect to the Debentures is due and
payable.

        "Investment Company Act," means the Investment Company Act of 1940, as
amended, as in effect at the date of execution of this instrument.

        "Investment Company Event" means the receipt by the Trust and the
Company of an Opinion of Counsel, rendered by a law firm having a recognized
national tax and securities law practice, to the effect that, as a result of the
occurrence of a change in law or regulation or a change in interpretation or
application of law or regulation by any legislative body, court, governmental
agency or regulatory authority (a "Change in 1940 Act Law"), the Trust is or
shall be considered an "investment company" that is required to be registered
under the Investment Company Act, which Change in 1940 Act Law becomes effective
on or after the date of original issuance of the Trust Preferred Securities
under the Trust Agreement; provided, however, that

                                       5
<PAGE>   14

the Trust or the Company shall have requested and received such an Opinion of
Counsel with regard to such matters within a reasonable period of time after the
Trust or the Company shall have become aware of the possible occurrence of any
such event.

        "Maturity Date" means the date on which the Debentures mature and on
which the principal shall be due and payable together with all accrued and
unpaid interest thereon including Compounded Interest and Additional Payments,
if any.

        "Ministerial Action" shall have the meaning set forth in Section 3.2.

        "Officers' Certificate" means a certificate signed by the chief
executive officer, president or a vice president and by the treasurer or an
assistant treasurer or the secretary or an assistant secretary of the Company
that is delivered to the Trustee in accordance with the terms hereof. Each such
certificate shall include the statements provided for in Section 15.7, if and to
the extent required by the provisions thereof.

        "Opinion of Counsel" means an opinion in writing of independent, outside
legal counsel for the Company that is delivered to the Trustee in accordance
with the terms hereof. Each such opinion shall include the statements provided
for in Section 15.7, if and to the extent required by the provisions thereof.

        "Outstanding," when used with reference to the Debentures, means,
subject to the provisions of Section 10.4, as of any particular time, all
Debentures heretofore authenticated and delivered by the Trustee under this
Indenture, except (a) Debentures theretofore canceled by the Trustee or any
paying agent, or delivered to the Trustee or any paying agent for cancellation
or that have previously been cancelled; (b) Debentures or portions thereof for
the payment or redemption of which moneys or Governmental Obligations in the
necessary amount shall have been deposited in trust with the Trustee or with any
paying agent (other than the Company) or shall have been set aside and
segregated in trust by the Company (if the Company shall act as its own paying
agent; provided however, that is such Debentures or portions of such Debentures
are to be redeemed prior to the maturity thereof, notice of such redemption
shall have been given as in Article III provided, or provision satisfactory to
the Trustee shall have been made for giving such notice; and (c) Debentures in
lieu of or in substitution for which other Debentures shall have been
authenticated and delivered pursuant to the terms of Section 2.6; provided,
however, that in determining whether the holders of the requisite percentage of
Debentures have given any request, notice, consent or waiver hereunder,
Debentures held by the Company or any Affiliate of the Company shall not be
included; provided, further, that the Trustee shall be protected in acting upon
any request, notice, consent or waiver unless a Responsible Officer of the
Trustee shall have actual knowledge that the holder of such Debenture is the
Company or an Affiliate thereof.

        "Person" means any individual, corporation, partnership, trust, limited
liability company, joint venture, joint-stock company, unincorporated
organization or government or any agency or political subdivision thereof.

        "Predecessor Debenture" means every previous Debenture evidencing all or
a portion of the same debt as that evidenced by such particular Debenture; and,
for the purposes of this

                                       6
<PAGE>   15

definition, any Debenture authenticated and delivered under Section 2.8 in lieu
of a lost, destroyed or stolen Debenture shall be deemed to evidence the same
debt as the lost, destroyed or stolen Debenture.

        "Property Trustee" has the meaning set forth in the Trust Agreement.

        "Redemption Price" shall have the meaning set forth in Section 3.2.

        "Responsible Officer" when used with respect to the Trustee means any
officer within the Corporate Trust Office of the Trustee with direct
responsibility for the administration of this Indenture, including any vice
president, any assistant vice president, any assistant secretary or any other
officer or assistant officer of the Trustee customarily performing functions
similar to those performed by the Persons who at the time shall be such
officers, respectively, or to whom corporate trust matter is referred because of
his or her knowledge of and familiarity with the particular subject.

        "Scheduled Maturity Date" means ________, 2031.

        "Securities Act," means the Securities Act of 1933, as amended, as in
effect at the date of execution of this instrument.

        "Senior Debt" means the principal of (and premium, if any) and interest,
if any (including interest accruing on or after the filing of any petition in
bankruptcy or for reorganization relating to the Company whether or not such
claim for post-petition interest is allowed in such proceeding), on Debt,
whether incurred on or prior to the date of this Indenture or thereafter
incurred, unless, in the instrument creating or evidencing the same or pursuant
to which the same is outstanding, it is provided that such obligations are not
superior in right of payment to the Debentures or to other Debt which is pari
passu with, or subordinated to, the Debentures; provided, however, that Senior
Debt shall not be deemed to include (i) any Debt of the Company which when
incurred and without respect to any election under Section 1111(b) of the United
States Bankruptcy Code of 1978, as amended, was without recourse to the Company;
(ii) any Debt of the Company to any of its Subsidiaries; (iii) Debt to any
employee of the Company; (iv) Debt which by its terms is subordinated to trade
accounts payable or accrued liabilities arising in the ordinary course of
business to the extent that payments made to the holders of such Debt by the
holders of the Debentures as a result of the subordination provisions of this
Indenture would be greater than they otherwise would have been as a result of
any obligation of such holders to pay amounts over to the obligees on such trade
accounts payable or accrued liabilities arising in the ordinary course of
business as a result of subordination provisions to which such Debt is subject;
and (v) Debt which constitutes Subordinated Debt.

        "Senior Indebtedness" shall have the meaning set forth in Section 16.1.

        "Special Event" means a Tax Event, an Investment Company Event or a
Capital Treatment Event.

        "Subordinated Debt" means the principal of (and premium, if any) and
interest, if any (including interest accruing on or after the filing of any
petition in bankruptcy or for reorganization relating to the Company whether or
not such claim for post-petition interest is

                                       7
<PAGE>   16

allowed in such proceeding), on Debt, whether incurred on or prior to the date
of this Indenture or thereafter incurred, which is by its terms expressly
provided to be junior and subordinate to Senior Debt of the Company (other than
the Debentures); provided, however, that Subordinated Debt will not be deemed to
include (i) any Debt of the Company which when incurred and without respect to
any election under Section 1111(b) of the United States Bankruptcy Code of 1978,
as amended, was without recourse to the Company, (ii) any Debt of the Company to
any of its subsidiaries, (iii) any Debt to any employee of the Company, (iv) any
Debt which by its terms is subordinated to trade accounts payable or accrued
liabilities arising in the ordinary course of business to the extent that
payments made to the holders of such Debt by the holders of the Subordinated
Debentures as a result of the subordination provisions of the Indenture would be
greater than they otherwise would have been as a result of any obligation of
such holders to pay amounts over to the obligees on such trade accounts payable
or accrued liabilities arising in the ordinary course of business as a result of
subordination provisions to which such Debt is subject, (v) Debt which
constitutes Senior Debt and (vi) any Debt of the Company under debt securities
(and guarantees in respect of these debt securities) initially issued to any
trust, or a trustee of a trust, partnership or other entity affiliated with the
Company that is, directly or indirectly, a financing vehicle of the Company in
connection with the issuance by that entity of preferred securities or other
securities which are intended to qualify for Tier 1 capital treatment.

        "Subsidiary" means, with respect to any Person, (i) any corporation at
least a majority of whose outstanding Voting Stock shall at the time be owned,
directly or indirectly, by such Person or by one or more of its Subsidiaries or
by such Person and one or more of its Subsidiaries; (ii) any general
partnership, joint venture or similar entity, at least a majority of whose
outstanding partnership or similar interests shall at the time be owned by such
Person, or by one or more of its Subsidiaries, or by such Person and one or more
of its Subsidiaries; (iii) any limited partnership of which such Person or any
of its Subsidiaries is a general partner; and (iv) any limited liability
company, a majority of the membership interests of which are held by such Person
or one or more of its Subsidiaries.

        "Tax Event" means the receipt by the Company and the Trust of an Opinion
of Counsel, rendered by a law firm having a recognized national tax and
securities practice, to the effect that, as a result of any amendment to, or
change (including any announced prospective change) in, the laws (or any
regulations there under) of the United States or any political subdivision or
taxing authority thereof or therein, or as a result of any official
administrative pronouncement or judicial decision interpreting or applying such
laws or regulations, which amendment or change is effective or which
pronouncement or decision is announced on or after the date of issuance of the
Trust Preferred Securities under the Trust Agreement, that (i) the Trust is, or
shall be within 90 days after the date of such Opinion of Counsel, subject to
United States federal income tax with respect to income received or accrued on
the Debentures; (ii) interest payable by the Company on the Debentures is not,
or within 90 days after the date of such Opinion of Counsel, shall not be,
deductible by the Company, in whole or in part, for United States federal income
tax purposes; or (iii) the Trust is, or shall be within 90 days after the date
of such Opinion of Counsel, subject to more than a de minimis amount of other
taxes, duties, assessments or other governmental charges; provided, however,
that the Trust or the Company shall have requested and received such an Opinion
of Counsel with regard to such matters within a reasonable period of time after
the Trust or the Company shall have become aware of the possible occurrence of
any of the events described in clauses (i) through (iii) above.

                                       8
<PAGE>   17

        "Trust" means Glacier Capital Trust I, a Delaware statutory business
trust.

        "Trust Agreement" means the Amended and Restated Trust Agreement,
dated________, 2001, of the Trust.

        "Trustee" means Wilmington Trust Company and, subject to the provisions
of Article IX, shall also include its successors and assigns, and, if at any
time there is more than one Person acting in such capacity hereunder, "Trustee"
shall mean each such Person.

        "Trust Indenture Act," means the Trust Indenture Act of 1939, as
amended, as in effect at the date of execution of this instrument, except as
provided in Sections 11.1, 11.2 and 12.1.

        "Trust Preferred Securities" means undivided beneficial interests in the
assets of the Trust which rank pari passu with Common Securities issued by the
Trust; provided, however, that upon the occurrence of an Event of Default, the
rights of holders of Common Securities to payment in respect of distributions
and payments upon liquidation, redemption and otherwise are subordinated to the
rights of holders of Trust Preferred Securities.

        "Trust Securities" means the Common Securities and Trust Preferred
Securities, collectively.

        "Voting Stock," as applied to stock of any Person, means shares,
interests, participations or other equivalents in the equity interest (however
designated) in such Person having ordinary voting power for the election of a
majority of the directors (or the equivalent) of such Person, other than shares,
interests, participations or other equivalents having such power only by reason
of the occurrence of a contingency.

                                   ARTICLE II.
                     ISSUE, DESCRIPTION, TERMS, CONDITIONS,
                   REGISTRATION AND EXCHANGE OF THE DEBENTURES

SECTION 2.1 DESIGNATION AND PRINCIPAL AMOUNT.

        There is hereby authorized Debentures designated the "________%
Subordinated Debentures due 2031," limited in aggregate principal amount to
$35,000,000, which amount shall be as set forth in any written order of the
Company for the authentication and delivery of Debentures pursuant to Section
2.5.

SECTION 2.2 MATURITY.

        (a) The Maturity Date shall be either:

                (i) the Scheduled Maturity Date; or

                (ii) if the Company elects to accelerate the Maturity Date to be
        a date prior to the Scheduled Maturity Date in accordance with Section
        2.2(b), the Accelerated Maturity Date.

                                       9
<PAGE>   18

        (b) The Company may at any time before the day which is 90 days before
the Scheduled Maturity Date and not earlier than ________, 2006, elect to
shorten the Maturity Date only once to the Accelerated Maturity Date; provided
that the Company has received the prior approval of the Federal Reserve if then
required under applicable capital guidelines, policies or regulations of the
Federal Reserve.

        (c) If the Company elects to accelerate the Maturity Date in accordance
with Section 2.2(b), the Company shall give notice to the Trustee and the Trust
(unless the Trust is not the holder of the Debentures, in which case the Trustee
will give notice to the holders of the Debentures) of the acceleration of the
Maturity Date and the Accelerated Maturity Date at least 90 days and no more
than 180 days before the Accelerated Maturity Date.

SECTION 2.3 FORM AND PAYMENT.

        The Debentures shall be issued in fully registered certificated form
without interest coupons. Principal and interest on the Debentures issued in
certificated form shall be payable, the transfer of such Debentures shall be
registrable and such Debentures shall be exchangeable for Debentures bearing
identical terms and provisions at the office or agency of the Trustee; provided,
however, that payment of interest may be made at the option of the Company by
check mailed to the holder at such address as shall appear in the Debenture
Register or by wire transfer to an account maintained by the holder as specified
in the Debenture Register, provided that the holder provides proper transfer
instructions by the regular record date. Notwithstanding the foregoing, so long
as the holder of any Debentures is the Property Trustee, the payment of
principal of and interest (including Compounded Interest and Additional
Payments, if any) on such Debentures held by the Property Trustee shall be made
at such place and to such account as may be designated by the Property Trustee.

SECTION 2.4 INTEREST.

        (a) Each Debenture shall bear interest at the rate of ________% per
annum (the "Coupon Rate") from the original date of issuance until the principal
thereof becomes due and payable, and on any overdue principal and (to the extent
that payment of such interest is enforceable under applicable law) on any
overdue installment of interest at the Coupon Rate, compounded quarterly,
payable (subject to the provisions of Article IV) quarterly in arrears on March
31, June 30, September 30 and December 31 of each year (each, an "Interest
Payment Date"), commencing on March 31, 2001 to the Person in whose name such
Debenture or any Predecessor Debenture is registered, at the close of business
on the regular record date for such interest installment, which shall be the
close of business on the Business Day immediately preceding such Interest
Payment Date.

        The amount of interest payable for any period shall be computed on the
basis of a 360-day year of twelve 30-day months. The amount of interest payable
for any period shorter than a full quarterly period for which interest is
computed, shall be computed on the basis of the number of days elapsed in a
360-day year of twelve 30-day months. In the event that any date on which
interest is payable on the Debentures is not a Business Day, then payment of
interest payable on such date shall be made on the next succeeding day which is
a Business Day (and without any interest or other payment in respect of any such
delay) except that, if such Business

                                       10
<PAGE>   19

Day is in the next succeeding calendar year, such payment shall be made on the
immediately preceding Business Day (and without any reduction of interest or any
other payment in respect of any such acceleration), in each case with the same
force and effect as if made on the date such payment was originally payable.

        (b) If, at any time while the Property Trustee is the holder of any
Debentures, the Trust or the Property Trustee is required to pay any taxes,
duties, assessments or governmental charges of whatever nature (other than
withholding taxes) imposed by the United States, or any other taxing authority,
then, in any case, the Company shall pay as additional payments ("Additional
Payments") on the Debentures held by the Property Trustee, such additional
amounts as shall be required so that the net amounts received and retained by
the Trust and the Property Trustee after paying such taxes, duties, assessments
or other governmental charges shall be equal to the amounts the Trust and the
Property Trustee would have received had no such taxes, duties, assessments or
other government charges been imposed.

SECTION 2.5 EXECUTION AND AUTHENTICATIONS.

        (a) The Debentures shall be signed on behalf of the Company by its
president or one of its vice presidents, under its corporate seal, if any,
attested by its secretary or one of its assistant secretaries. Signatures may be
in the form of a manual or facsimile signature. The Company may use the
facsimile signature of any Person who shall have been a president or vice
president thereof, or of any Person who shall have been a secretary or assistant
secretary thereof, notwithstanding the fact that at the time the Debentures
shall be authenticated and delivered or disposed of such Person shall have
ceased to be the president or a vice president, or the secretary or an assistant
secretary, of the Company (and any such signature shall be binding on the
Company). The seal of the Company may be in the form of a facsimile of such seal
and may be impressed, affixed, imprinted or otherwise reproduced on the
Debentures. The Debentures may contain such notations, legends or endorsements
required by law, stock exchange rule or usage. Each Debenture shall be dated the
date of its authentication by the Trustee. A Debenture shall not be valid until
authenticated manually by an authorized signatory of the Trustee, or by an
Authenticating Agent. Such signature shall be conclusive evidence that the
Debenture so authenticated has been duly authenticated and delivered hereunder
and that the holder is entitled to the benefits of this Indenture.

        (b) At any time and from time to time after the execution and delivery
of this Indenture, the Company may deliver Debentures executed by the Company to
the Trustee for authentication, together with a written order of the Company for
the authentication and delivery of such Debentures signed by its chairman,
president or any vice president and its treasurer or any assistant treasurer,
and the Trustee in accordance with such written order shall authenticate and
deliver such Debentures.

        (c) In authenticating such Debentures and accepting the additional
responsibilities under this Indenture in relation to such Debentures, the
Trustee shall be entitled to receive, and (subject to Section 9.1) shall be
fully protected in relying upon, an Opinion of Counsel stating that the form and
terms thereof have been established in conformity with the provisions of this
Indenture.

                                       11
<PAGE>   20

        (d) The Trustee shall not be required to authenticate such Debentures if
the issue of such Debentures pursuant to this Indenture shall affect the
Trustee's own rights, duties or immunities under the Debentures and this
Indenture or otherwise in a manner that is not reasonably acceptable to the
Trustee.

SECTION 2.6 REGISTRATION OF TRANSFER AND EXCHANGE.

        (a) Debentures may be exchanged upon presentation thereof at the office
or agency of the Company designated for such purpose in Wilmington, Delaware or
at the office of the Debenture Registrar, for other Debentures and for a like
aggregate principal amount in denominations of integral multiples of $25.00,
upon payment of a sum sufficient to cover any tax or other governmental charge
in relation thereto, all as provided in this Section 2.6. In respect of any
Debentures so surrendered for exchange, the Company shall execute, the Trustee
shall authenticate and such office or agency shall deliver in exchange therefor
the Debenture or Debentures that the Debenture holder making the exchange shall
be entitled to receive, bearing numbers not contemporaneously outstanding.

        (b) The Company shall keep, or cause to be kept, at its office or agency
designated for such purpose in Wilmington, Delaware, or at the office of the
Debenture Registrar or such other location designated by the Company, a register
or registers (herein referred to as the "Debenture Register") in which, subject
to such reasonable regulations as it may prescribe, the Company shall register
the Debentures and the transfers of Debentures as in this Article II provided
and which at all reasonable times shall be open for inspection by the Trustee.
The registrar for the purpose of registering Debentures and transfer of
Debentures as herein provided shall initially be the Trustee and thereafter as
may be appointed by the Company as authorized by Board Resolution (the
"Debenture Registrar"). Upon surrender for transfer of any Debenture at the
office or agency of the Company designated for such purpose, the Company shall
execute, the Trustee shall authenticate and such office or agency shall deliver
in the name of the transferee or transferees a new Debenture or Debentures for a
like aggregate principal amount. All Debentures presented or surrendered for
exchange or registration of transfer, as provided in this Section 2.6, shall be
accompanied (if so required by the Company or the Debenture Registrar) by a
written instrument or instruments of transfer, in form satisfactory to the
Company or the Debenture Registrar, duly executed by the registered holder or by
such holder's duly authorized attorney in writing.

        (c) No service charge shall be made for any exchange or registration of
transfer of Debentures, or issue of new Debentures in case of partial
redemption, but the Company may require payment of a sum sufficient to cover any
tax or other governmental charge in relation thereto, other than exchanges
pursuant to Section 2.7, Section 3.5(b) and Section 11.4 not involving any
transfer.

        (d) The Company shall not be required (i) to issue, exchange or register
the transfer of any Debentures during a period beginning at the opening of
business 15 days before the day of the mailing of a notice of redemption of less
than all the Outstanding Debentures and ending at the close of business on the
day of such mailing; nor (ii) to register the transfer of or exchange any
Debentures or portions thereof called for redemption.

                                       12
<PAGE>   21

        (e) Debentures may only be transferred, in whole or in part, in
accordance with the terms and conditions set forth in this Indenture. Any
transfer or purported transfer of any Debenture not made in accordance with this
Indenture shall be null and void.

SECTION 2.7 TEMPORARY DEBENTURES.

        Pending the preparation of definitive Debentures, the Company may
execute, and the Trustee shall authenticate and deliver, temporary Debentures
(printed, lithographed, or typewritten). Such temporary Debentures shall be
substantially in the form of the definitive Debentures in lieu of which they are
issued, but with such omissions, insertions and variations as may be appropriate
for temporary Debentures, all as may be determined by the Company. Every
temporary Debenture shall be executed by the Company and be authenticated by the
Trustee upon the same conditions and in substantially the same manner, and with
like effect, as the definitive Debentures. Without unnecessary delay the Company
shall execute and shall furnish definitive Debentures and thereupon any or all
temporary Debentures may be surrendered in exchange therefor (without charge to
the holders), at the office or agency of the Company designated for the purpose
and the Trustee shall authenticate and such office or agency shall deliver in
exchange for such temporary Debentures an equal aggregate principal amount of
definitive Debentures, unless the Company advises the Trustee to the effect that
definitive Debentures need not be executed and furnished until further notice
from the Company. Until so exchanged, the temporary Debentures shall be entitled
to the same benefits under this Indenture as definitive Debentures authenticated
and delivered hereunder.

SECTION 2.8 MUTILATED, DESTROYED, LOST OR STOLEN DEBENTURES.

        (a) In case any temporary or definitive Debenture shall become mutilated
or be destroyed, lost or stolen, the Company (subject to the next succeeding
sentence) shall execute, and upon the Company's request the Trustee (subject as
aforesaid) shall authenticate and deliver, a new Debenture bearing a number not
contemporaneously outstanding, in exchange and substitution for the mutilated
Debenture, or in lieu of and in substitution for the Debenture so destroyed,
lost, stolen or mutilated. In every case the applicant for a substituted
Debenture shall furnish to the Company and the Trustee such security or
indemnity as may be required by them to save each of them harmless, and, in
every case of destruction, loss or theft, the applicant shall also furnish to
the Company and the Trustee evidence to their satisfaction of the destruction,
loss or theft of the applicant's Debenture and of the ownership thereof. The
Trustee may authenticate any such substituted Debenture and deliver the same
upon the written request or authorization of the chairman, president or any vice
president and the treasurer or any assistant treasurer of the Company. Upon the
issuance of any substituted Debenture, the Company may require the payment of a
sum sufficient to cover any tax or other governmental charge that may be imposed
in relation thereto and any other expenses (including the fees and expenses of
the Trustee) connected therewith. In case any Debenture that has matured or is
about to mature shall become mutilated or be destroyed, lost or stolen, the
Company may, instead of issuing a substitute Debenture, pay or authorize the
payment of the same (without surrender thereof except in the case of a mutilated
Debenture) if the applicant for such payment shall furnish to the Company and
the Trustee such security or indemnity as they may require to save them
harmless, and, in case of destruction, loss or theft, evidence to the
satisfaction of the Company and the Trustee of the destruction, loss or theft of
such Debenture and of the ownership thereof.

                                       13
<PAGE>   22

        (b) Every replacement Debenture issued pursuant to the provisions of
this Section 2.8 shall constitute an additional contractual obligation of the
Company whether or not the mutilated, destroyed, lost or stolen Debenture shall
be found at any time, or be enforceable by anyone, and shall be entitled to all
the benefits of this Indenture equally and proportionately with any and all
other Debentures duly issued hereunder. All Debentures shall be held and owned
upon the express condition that the foregoing provisions are exclusive with
respect to the replacement or payment of mutilated, destroyed, lost or stolen
Debentures, and shall preclude (to the extent lawful) any and all other rights
or remedies, notwithstanding any law or statute existing or hereafter enacted to
the contrary with respect to the replacement or payment of negotiable
instruments or other securities without their surrender.

SECTION 2.9 CANCELLATION.

        All Debentures surrendered for the purpose of payment, redemption,
exchange or registration of transfer shall, if surrendered to the Company or any
paying agent, be delivered to the Trustee for cancellation, or, if surrendered
to the Trustee, shall be canceled by it, and no Debentures shall be issued in
lieu thereof except as expressly required or permitted by any of the provisions
of this Indenture. On request of the Company at the time of such surrender, the
Trustee shall deliver to the Company canceled Debentures held by the Trustee. In
the absence of such request the Trustee may dispose of canceled Debentures in
accordance with its standard procedures and deliver a certificate of disposition
to the Company. If the Company shall otherwise acquire any of the Debentures,
however, such acquisition shall not operate as a redemption or satisfaction of
the indebtedness represented by such Debentures unless and until the same are
delivered to the Trustee for cancellation.

SECTION 2.10 BENEFIT OF INDENTURE.

        Nothing in this Indenture or in the Debentures, express or implied,
shall give or be construed to give to any Person, other than the parties hereto
and the holders of the Debentures (and, with respect to the provisions of
Article XVI, the holders of Senior Indebtedness) any legal or equitable right,
remedy or claim under or in respect of this Indenture, or under any covenant,
condition or provision herein contained; all such covenants, conditions and
provisions being for the sole benefit of the parties hereto and of the holders
of the Debentures (and, with respect to the provisions of Article XVI, the
holders of Senior Indebtedness).

SECTION 2.11 AUTHENTICATION AGENT.

        (a) So long as any of the Debentures remain Outstanding there may be an
Authenticating Agent for any or all such Debentures, which the Trustee shall
have the right to appoint. Said Authenticating Agent shall be authorized to act
on behalf of the Trustee to authenticate Debentures issued upon exchange,
transfer or partial redemption thereof, and Debentures so authenticated shall be
entitled to the benefits of this Indenture and shall be valid and obligatory for
all purposes as if authenticated by the Trustee hereunder. All references in
this Indenture to the authentication of Debentures by the Trustee shall be
deemed to include authentication by an Authenticating Agent. Each Authenticating
Agent shall be acceptable to the Company and shall be a corporation that has a
combined capital and surplus, as most recently reported or determined by it,
sufficient under the laws of any jurisdiction under which it is

                                       14
<PAGE>   23

organized or in which it is doing business to conduct a trust business, and that
is otherwise authorized under such laws to conduct such business and is subject
to supervision or examination by federal or state authorities. If at any time
any Authenticating Agent shall cease to be eligible in accordance with these
provisions, it shall resign immediately.

        (b) Any Authenticating Agent may at any time resign by giving written
notice of resignation to the Trustee and to the Company. The Trustee may at any
time (and upon request by the Company shall) terminate the agency of any
Authenticating Agent by giving written notice of termination to such
Authenticating Agent and to the Company. Upon resignation, termination or
cessation of eligibility of any Authenticating Agent, the Trustee may appoint an
eligible successor Authenticating Agent acceptable to the Company. Any successor
Authenticating Agent, upon acceptance of its appointment hereunder, shall become
vested with all the rights, powers and duties of its predecessor hereunder as if
originally named as an Authenticating Agent pursuant hereto.

                                  ARTICLE III.

                            REDEMPTION OF DEBENTURES

SECTION 3.1 REDEMPTION.

        Subject to the Company having received prior approval of the Federal
Reserve, if then required under the applicable capital guidelines, policies or
regulations of the Federal Reserve, the Company may redeem the Debentures issued
hereunder on and after the dates set forth in and in accordance with the terms
of this Article III.

SECTION 3.2 SPECIAL EVENT REDEMPTION.

        Subject to the Company having received the prior approval of the Federal
Reserve, if then required under the applicable capital guidelines, policies or
regulations of the Federal Reserve, if a Special Event has occurred and is
continuing, then, notwithstanding Section 3.3(a) but subject to Section 3.3(b),
the Company shall have the right upon not less than 30 days' nor more than 60
days' notice to the holders of the Debentures to redeem the Debentures, in whole
but not in part, for cash within 180 days following the occurrence of such
Special Event (the "180-Day Period") at a redemption price equal to 100% of the
principal amount to be redeemed plus any accrued and unpaid interest thereon to
the date of such redemption (the "Redemption Price"), provided that if at the
time there is available to the Company the opportunity to eliminate, within the
180-Day Period, a Tax Event by taking some ministerial action (a "Ministerial
Action"), such as filing a form or making an election, or pursuing some other
similar reasonable measure which has no adverse effect on the Company, the Trust
or the holders of the Trust Securities issued by the Trust, the Company shall
pursue such Ministerial Action in lieu of redemption. The Redemption Price shall
be paid prior to 12:00 noon, New York time, on the date of such redemption or
such earlier time as the Company determines, provided that the Company shall
deposit with the Trustee an amount sufficient to pay the Redemption Price by
10:00 a.m., New York time, on the date such Redemption Price is to be paid.

                                       15
<PAGE>   24

SECTION 3.3 OPTIONAL REDEMPTION BY COMPANY.

        (a) Subject to the provisions of Section 3.3(c), except as otherwise may
be specified in this Indenture, the Company shall have the right to redeem the
Debentures, in whole or in part, from time to time, on or after __________,
2006, at a Redemption Price equal to 100% of the principal amount to be redeemed
plus any accrued and unpaid interest thereon to the date of such redemption. Any
redemption pursuant to this Section 3.3(a) shall be made upon not less than 30
days' nor more than 60 days' notice to the holder of the Debentures, at the
Redemption Price. If the Debentures are only partially redeemed pursuant to this
Section 3.3, the Debentures shall be redeemed pro rata or by lot or in such
other manner as the Trustee shall deem appropriate and fair in its discretion.
The Redemption Price shall be paid prior to 12:00 noon, New York time, on the
date of such redemption or at such earlier time as the Company determines,
provided that the Company shall deposit with the Trustee an amount sufficient to
pay the Redemption Price by 10:00 a.m., New York time, on the date such
Redemption Price is to be paid.

        (b) Subject to the provisions of Section 3.3(c), the Company shall have
the right to redeem Debentures at any time and from time to time in a principal
amount equal to the Liquidation Amount (as defined in the Trust Agreement) of
any Trust Preferred Securities purchased and beneficially owned by the Company,
plus an additional principal amount of Debentures equal to the Liquidation
Amount or that number of Common Securities that bears the same proportion to the
total number of Common Securities the outstanding as the number of Trust
Preferred Securities to be redeemed bears to the total number of Trust Preferred
Securities then outstanding. Such Debentures shall be redeemed pursuant to this
Section 3.3(b) only in exchange for and upon surrender by the amount of Common
Securities, whereupon the Property Trustee of the Trust Preferred Securities and
a proportionate amount of Common Securities, whereupon the Property Trustee
shall cancel the Trust Preferred Securities and Common Securities so surrendered
and a Like Amount (as defined in the Trust Agreement) of Debentures shall be
extinguished by the Trustee and shall no longer be deemed Outstanding.

        (c) If a partial redemption of the Debentures would result in the
delisting of the Trust Preferred Securities issued by the Trust from the Nasdaq
National Market System or any other automated quotation system or securities
exchange on which the Trust Preferred Securities are then listed or quoted, the
Company shall not be permitted to effect such partial redemption and may only
redeem the Debentures in whole.

SECTION 3.4 NOTICE OF REDEMPTION

        (a) In case the Company shall desire to exercise such right to redeem
all or, as the case may be, a portion of the Debentures in accordance with the
right reserved so to do, the Company shall, or shall cause the Trustee to upon
receipt of 45 days' written notice from the Company (which notice shall, in the
event of a partial redemption, include a representation to the effect that such
partial redemption will not result in the delisting of the Trust Preferred
Securities as described in Section 3.3(b) above), give notice of such redemption
to holders of the Debentures to be redeemed by mailing, first class postage
prepaid, a notice of such redemption not less than 30 days and not more than 60
days before the date fixed for redemption to such holders at their last
addresses as they shall appear upon the Debenture Register unless a shorter
period is specified in the Debentures to be redeemed. Any notice that is mailed
in the manner

                                       16
<PAGE>   25

herein provided shall be conclusively presumed to have been duly given, whether
or not the registered holder receives the notice. In any case, failure duly to
give such notice to the holder of any Debenture designated for redemption in
whole or in part, or any defect in the notice, shall not affect the validity of
the proceedings for the redemption of any other debentures. In the case of any
redemption of Debentures prior to the expiration of any restriction on such
redemption provided in the terms of such Debentures or elsewhere in this
Indenture, the Company shall furnish the Trustee with an Officers' Certificate
evidencing compliance with any such restriction. Each such notice of redemption
shall specify the date fixed for redemption and the Redemption Price and shall
state that payment of the Redemption Price shall be made at the office or agency
of the Company or at the Corporate Trust Office, upon presentation and surrender
of such Debentures, that interest accrued to the date fixed for redemption shall
be paid as specified in said notice and that from and after said date interest
shall cease to accrue. If less than all the Debentures are to be redeemed, the
notice to the holders of the Debentures shall specify the particular Debentures
to be redeemed. If the Debentures are to be redeemed in part only, the notice
shall state the portion of the principal amount thereof to be redeemed and shall
state that on and after the redemption date, upon surrender of such Debenture, a
new Debenture or Debentures in principal amount equal to the unredeemed portion
thereof shall be issued.

        (b) If less than all the Debentures are to be redeemed, the Company
shall give the Trustee at least 45 days' notice in advance of the date fixed for
redemption as to the aggregate principal amount of Debentures to be redeemed,
and thereupon the Trustee shall select, pro rata or by lot or in such other
manner as it shall deem appropriate and fair in its discretion, the portion or
portions (equal to $25.00 or any integral multiple thereof) of the Debentures to
be redeemed and shall thereafter promptly notify the Company in writing of the
numbers of the Debentures to be redeemed, in whole or in part. The Company may,
if and whenever it shall so elect pursuant to the terms hereof, by delivery of
instructions signed on its behalf by its chairman, its president or any vice
president, instruct the Trustee or any paying agent to call all or any part of
the Debentures for redemption and to give notice of redemption in the manner set
forth in this Section 3.4, such notice to be in the name of the Company or its
own name as the Trustee or such paying agent may deem advisable. In any case in
which notice of redemption is to be given by the Trustee or any such paying
agent, the Company shall deliver or cause to be delivered to, or permit to
remain with, the Trustee or such paying agent, as the case may be, such
Debenture Register, transfer books or other records, or suitable copies or
extracts there from, sufficient to enable the Trustee or such paying agent to
give any notice by mail that may be required under the provisions of this
Section 3.4.

SECTION 3.5 PAYMENT UPON REDEMPTION.

        (a) If the giving of notice of redemption shall have been completed as
above provided, the Debentures or portions of Debentures to be redeemed
specified in such notice shall become due and payable on the date and at the
place stated in such notice at the applicable Redemption Price, and interest on
such Debentures or portions of Debentures shall cease to accrue on and after the
date fixed for redemption, unless the Company shall default in the payment of
such Redemption Price with respect to any such Debenture or portion thereof. On
presentation and surrender of such Debentures on or after the date fixed for
redemption at the place of payment specified in the notice, said Debentures
shall be paid and redeemed at the Redemption Price (but if the date fixed for
redemption is an Interest Payment Date, the interest

                                       17
<PAGE>   26

installment payable on such date shall be payable to the registered holder at
the close of business on the applicable record date pursuant to Section 3.3).

        (b) Upon presentation of any Debenture that is to be redeemed in part
only, the Company shall execute and the Trustee shall authenticate and the
office or agency where the Debenture is presented shall deliver to the holder
thereof, at the expense of the Company, a new Debenture of authorized
denomination in principal amount equal to the unredeemed portion of the
Debenture so presented.

SECTION 3.6 NO SINKING FUND.

        The Debentures are not entitled to the benefit of any sinking fund.

                                   ARTICLE IV.

                      EXTENSION OF INTEREST PAYMENT PERIOD

SECTION 4.1 EXTENSION OF INTEREST PAYMENT PERIOD.

        The Company shall have the right, at any time and from time to time
during the term of the Debentures so long as no Event of Default has occurred
and is continuing, to defer payments of interest by extending the interest
payment period of such Debentures for a period not exceeding 20 consecutive
quarters (the "Extended Interest Payment Period"), during which Extended
Interest Payment Period no interest shall be due and payable; provided that no
Extended Interest Payment Period may extend beyond the Maturity Date or end on a
date other than an Interest Payment Date. To the extent permitted by applicable
law, interest, the payment of which has been deferred because of the extension
of the interest payment period pursuant to this Section 4.1, shall bear interest
thereon at the Coupon Rate compounded quarterly for each quarter of the Extended
Interest Payment Period ("Compounded Interest"). At the end of the Extended
Interest Payment Period, the Company shall calculate (and deliver such
calculation to the Trustee) and pay all interest accrued and unpaid on the
Debentures, including any Additional Payments and Compounded Interest (together,
"Deferred Payments") that shall be payable to the holders of the Debentures in
whose names the Debentures are registered in the Debenture Register on the first
record date after the end of the Extended Interest Payment Period. Before the
termination of any Extended Interest Payment Period, the Company may further
extend such period so long as no Event of Default has occurred and is
continuing, provided that such period together with all such further extensions
thereof shall not exceed 20 consecutive quarters, or extend beyond the Maturity
Date of the Debentures or end on a date other than an Interest Payment Date.
Upon the termination of any Extended Interest Payment Period and upon the
payment of all Deferred Payments then due, the Company may commence a new
Extended Interest Payment Period, subject to the foregoing requirements. No
interest shall be due and payable during an Extended Interest Payment Period,
except at the end thereof, but the Company may prepay at any time all or any
portion of the interest accrued during an Extended Interest Payment Period.

                                       18
<PAGE>   27

SECTION 4.2 NOTICE OF EXTENSION.

        (a) If the Property Trustee is the only registered holder of the
Debentures at the time the Company selects an Extended Interest Payment Period,
the Company shall give written notice to the Administrative Trustees, the
Property Trustee and the Trustee of its selection of such Extended Interest
Payment Period two Business Days before the earlier of (i) the next succeeding
date on which Distributions on the Trust Securities issued by the Trust are
payable; or (ii) the date the Trust is required to give notice of the record
date, or the date such Distributions are payable, to the Nasdaq National Market
System or other applicable self-regulatory organization or to holders of the
Trust Preferred Securities issued by the Trust, but in any event at least one
Business Day before such record date.

        (b) If the Property Trustee is not the only holder of the Debentures at
the time the Company selects an Extended Interest Payment Period, the Company
shall give the holders of the Debentures and the Trustee written notice of its
selection of such Extended Interest Payment Period at least two Business Days
before the earlier of (i) the next succeeding Interest Payment Date; or (ii) the
date the Company is required to give notice of the record or payment date of
such interest payment to the Nasdaq National Market System or other applicable
self-regulatory organization or to holders of the Debentures.

        (c) The quarter in which any notice is given pursuant to paragraphs (a)
or (b) of this Section 4.2 shall be counted as one of the 20 quarters permitted
in the maximum Extended Interest Payment Period permitted under Section 4.1.

SECTION 4.3 LIMITATION ON TRANSACTIONS.

        If (i) the Company shall exercise its right to defer payment of interest
as provided in Section 4.1; (ii) there shall have occurred and be continuing any
Event of Default; or (iii) the Company is in default with respect to its
obligations under the Guarantee, then (a) the Company will not, and will not
permit any Subsidiary to, declare or pay any dividend on, make any distributions
with respect to, or redeem, purchase, acquire or make a liquidation payment with
respect to, any of its capital stock (other than (I) dividends or distributions
in common stock of the Company or such Subsidiary, as the case may be, or any
declaration of a non-cash dividend in connection with the implementation of a
shareholder rights plan, or the issuance of stock under any plan in the future,
or the redemption or repurchase of any such rights pursuant thereto, (II)
purchases of common stock of the Company related to the rights under any of the
Company's benefit plans for its directors, officers or employees, (III) as a
result of a reclassification of its capital stock for another class of its
capital stock, or (IV) declarations or payments of dividends or distributions on
capital stock by a Subsidiary of the Company to the Company or any of its
Subsidiaries); (b) the Company shall not and will not permit any Subsidiary to
make any payment of interest, principal or premium, if any, on or repay,
repurchase or redeem any debt securities issued by the Company which rank pari
passu with or junior to the Debentures or make any guarantee payment with
respect to any guarantee by the Company of the debt securities of any Subsidiary
of the Company if such guarantee ranks pari passu with or junior to the
Debentures; provided, however, that notwithstanding the foregoing the Company
may make payments pursuant to its obligations under the Guarantee; and (c) the

                                       19
<PAGE>   28

Company shall not redeem, purchase or acquire less than all of the outstanding
Debentures or any of the Trust Preferred Securities.

                                   ARTICLE V.

                       PARTICULAR COVENANTS OF THE COMPANY

SECTION 5.1 PAYMENT OF PRINCIPAL AND INTEREST.

        The Company shall duly and punctually pay or cause to be paid the
principal of and interest on the Debentures at the time and place and in the
manner provided herein.

SECTION 5.2 MAINTENANCE OF AGENCY.

        So long as any of the Debentures remain Outstanding, the Company shall
maintain, or shall cause to be maintained, an office or agency in Wilmington,
Delaware, and at such other location or locations as may be designated as
provided in this Section 5.2, where (i) Debentures may be presented for payment;
(ii) Debentures may be presented as hereinabove authorized for registration of
transfer and exchange; and (iii) notices and demands to or upon the Company in
respect of the Debentures and this Indenture may be given or served, such
designation to continue with respect to such office or agency until the Company
shall, by written notice signed by its president or an executive vice president
and delivered to the Trustee, designate some other office or agency for such
purposes or any of them. If at any time the Company shall fail to maintain any
such required office or agency or shall fail to furnish the Trustee with the
address thereof, such presentations, notices and demands may be made or served
at the Corporate Trust Office of the Trustee, and the Company hereby appoints
the Trustee as its agent to receive all such presentations, notices and demands.
In addition to any such office or agency, the Company may from time to time
designate one or more offices or agencies outside of Wilmington, Delaware where
the Debentures may be presented for registration or transfer and for exchange in
the manner provided herein, and the Company may from time to time rescind such
designation as the Company may deem desirable or expedient; provided, however,
that no such designation or rescission shall in any manner relieve the Company
of its obligation to maintain any such office or agency in Wilmington, Delaware
for the purposes above mentioned. The Company shall give the Trustee prompt
written notice of any such designation or rescission thereof.

SECTION 5.3 PAYING AGENTS

        (a) The Trustee shall be the initial paying agent. If the Company shall
appoint one or more paying agents for the Debentures, other than the Trustee,
the Company shall cause each such paying agent to execute and deliver to the
Trustee an instrument in which such agent shall agree with the Trustee, subject
to the provisions of this Section 5.3:

                (i) that it shall hold all sums held by it as such agent for the
        payment of the principal of or interest on the Debentures (whether such
        sums have been paid to it by the Company or by any other obligor of such
        Debentures) in trust for the benefit of the Persons entitled thereto;

                                       20
<PAGE>   29

                (ii) that it shall give the Trustee prompt written notice of any
        failure by the Company (or by any other obligor of such Debentures) to
        make any payment of the principal of or interest on the Debentures when
        the same shall be due and payable;

                (iii) that it shall, at any time during the continuance of any
        failure referred to in the preceding paragraph (a)(ii) above, upon the
        written request of the Trustee, forthwith pay to the Trustee all sums so
        held in trust by such paying agent;

                (iv) and that it shall perform all other duties of paying agent
        as set forth in this Indenture.

        (b) If the Company shall act as its own paying agent with respect to the
Debentures, it shall on or before each due date of the principal of or interest
on such Debentures, set aside, segregate and hold in trust for the benefit of
the Persons entitled thereto a sum sufficient to pay such principal or interest
so becoming due on Debentures until such sums shall be paid to such Persons or
otherwise disposed of as herein provided and shall promptly notify the Trustee
of such action, or any failure (by it or any other obligor on such Debentures)
to take such action. Whenever the Company shall have one or more paying agents
for the Debentures, it shall, prior to each due date of the principal of or
interest on any Debentures, deposit with the paying agent a sum sufficient to
pay the principal or interest so becoming due, such sum to be held in trust for
the benefit of the Persons entitled to such principal or interest, and (unless
such paying agent is the Trustee) the Company shall promptly notify the Trustee
of this action or failure so to act.

        (c) Notwithstanding anything in this Section 5.3 to the contrary, (i)
the agreement to hold sums in trust as provided in this Section 5.3 is subject
to the provisions of Section 13.3 and 13.4; and (ii) the Company may at any
time, for the purpose of obtaining the satisfaction and discharge of this
Indenture or for any other purpose, pay, or direct any paying agent to pay, to
the Trustee all sums held in trust by the Company or such paying agent, such
sums to be held by the Trustee upon the same terms and conditions as those upon
which such sums were held by the Company or such paying agent; and, upon such
payment by any paying agent to the Trustee, such paying agent shall be released
from all further liability with respect to such money.

SECTION 5.4 APPOINTMENT TO FILL VACANCY IN OFFICE OF TRUSTEE.

        The Company, whenever necessary to avoid or fill a vacancy in the office
of Trustee, shall appoint, in the manner provided in Section 9.10, a Trustee, so
that there shall at all times be a Trustee hereunder.

SECTION 5.5 COMPLIANCE WITH CONSOLIDATION PROVISIONS.

        The Company shall not, while any of the Debentures remain outstanding,
consolidate with, or merge into, or merge into itself, or convey, transfer or
lease all or substantially all of its property and assets to any other entity
and no entity shall consolidate with or merge into the Company or convey,
transfer or lease substantially all of its properties and assets to the Company,
unless the provisions of Article XII hereof are complied with.

                                       21
<PAGE>   30

SECTION 5.6 LIMITATION ON TRANSACTIONS.

        (a) If Debentures are issued to the Trust or a Trustee of the Trust in
connection with the issuance of Trust Securities by the Trust and (i) there
shall have occurred any event that would constitute an Event of Default; (ii)
the Company shall be in default with respect to any of its obligations under the
Guarantee relating to the Trust; or (iii) the Company shall have given notice of
its election to defer payments of interest on such Debentures by extending the
interest payment period as provided in this Indenture and such period, or any
extension thereof, shall be continuing, then the Company shall not and will not
permit any Subsidiary to declare or pay any dividend on, make any distributions
with respect to, or redeem, purchase, acquire or make a liquidation payment with
respect to, any of its capital stock (other than (I) dividends or distributions
in common stock of the Company or such Subsidiary, as the case may be, or any
declaration of a non-cash dividend in connection with the implementation of a
shareholder rights plan, or the issuance of stock under any plan in the future,
or the redemption or repurchase of any such rights pursuant thereto, (II)
purchases of common stock of the Company related to the rights under any of the
Company's benefit plans for its directors, officers or employees, (III) as a
result of a reclassification of its capital stock for another class of its
capital stock, or (IV) declarations or payments of dividends or distributions on
capital stock by a Subsidiary of the Company to the Company or any of its
Subsidiaries); and

        (b) the Company shall not and will not permit any Subsidiary to make any
payment of interest, principal or premium, if any, or repay, repurchase or
redeem any debt securities issued by the Company which rank pari passu with or
junior to the Debentures or make any guarantee payments with respect to any
guarantee by the Company of the debt securities of any Subsidiary of the Company
if such guarantee ranks pari passu with or junior in interest to the Debentures;
provided, however, that the Company may make payments pursuant to its
obligations under the Guarantee; and

        (c) the Company shall not redeem, purchase or acquire less than all of
the outstanding Debentures or any of the Trust Preferred Securities.

SECTION 5.7 COVENANTS AS TO THE TRUST.

        For so long as such Trust Securities of the Trust remain outstanding,
the Company shall (i) maintain 100% direct or indirect ownership of the Common
Securities of the Trust; provided, however, that any permitted successor of the
Company under this Indenture may succeed to the Company's ownership of the
Common Securities; (ii) not voluntarily terminate, wind up or liquidate the
Trust, except upon prior approval of the Federal Reserve if then so required
under applicable capital guidelines, policies or regulations of the Federal
Reserve and use its reasonable efforts to cause the Trust (a) to remain a
business trust (and to avoid involuntary termination, winding up or
liquidation), except in connection with a distribution of Debentures, the
redemption of all of the Trust Securities of the Trust or certain mergers,
consolidations or amalgamations, each as permitted by the Trust Agreement; and
(b) to otherwise continue not to be treated as an association taxable as a
corporation or partnership for United States federal income tax purposes; (iii)
use its reasonable efforts to cause each holder of Trust Securities to be
treated as owning an individual beneficial interest in the Debentures and (iv)
use its reasonable best efforts to maintain the eligibility of the Trust
Preferred Securities for quotation or listing on

                                       22
<PAGE>   31

the Nasdaq National Market System or on such other automated quotation system or
securities exchange on which the Trust Preferred Securities are then quoted or
listed. In connection with the distribution of the Debentures to the holders of
the Trust Preferred Securities issued by the Trust upon a Dissolution Event, the
Company shall use its best efforts to list such Debentures on the Nasdaq
National Market System or on such exchange or self regulatory organization as
the Trust Preferred Securities are then quoted or listed.

SECTION 5.8 COVENANTS AS TO PURCHASES.

        Except upon the exercise by the Company of its right to redeem the
Debentures pursuant to Section 3.2 upon the occurrence and continuation of a
Special Event or pursuant to Section 3.3(b), the Company shall not purchase any
Debentures, in whole or in part, from the Trust prior to _____, 2006.

SECTION 5.9 WAIVER OF USURY, STAY OR EXTENSION LAWS.

        The Company shall not at any time insist upon, or plead, or in any
manner whatsoever claim or take the benefit or advantage of, any usury, stay or
extension law wherever enacted, now or at any time hereafter in force, which may
affect the covenants or the performances of this Indenture, and the Company (to
the extent that it may lawfully do so) hereby expressly waives all benefit or
advantage of any such law, and covenants that it will not hinder, delay or
impede the execution of any power herein granted to the Trustee, but will suffer
and permit the execution of every such power as though no such law had be
enacted.

                                   ARTICLE VI.
                       DEBENTUREHOLDERS' LISTS AND REPORTS
                         BY THE COMPANY AND THE TRUSTEE

SECTION 6.1 COMPANY TO FURNISH TRUSTEE NAMES AND ADDRESSES OF DEBENTUREHOLDERS.

        The Company shall furnish or cause to be furnished to the Trustee (a) on
a quarterly basis on each regular record date (as described in Section 2.5) a
list, in such form as the Trustee may reasonably require, of the names and
addresses of the holders of the Debentures as of such regular record date,
provided that the Company shall not be obligated to furnish or cause to furnish
such list at any time that the list shall not differ in any respect from the
most recent list furnished to the Trustee by the Company (in the event the
Company fails to provide such list on a quarterly basis, the Trustee shall been
entitled to rely on the most recent list provided by the Company); and (b) at
such other times as the Trustee may request in writing within 30 days after the
receipt by the Company of any such request, a list of similar form and content
as of a date not more than 15 days prior to the time such list is furnished;
provided, however, that, in either case, no such list need be furnished if the
Trustee shall be the Debenture Registrar.

SECTION 6.2 PRESERVATION OF INFORMATION COMMUNICATIONS WITH DEBENTUREHOLDERS.

        (a) The Trustee shall preserve, in as current a form as is reasonably
practicable, all information as to the names and addresses of the holders of
Debentures contained in the most

                                       23
<PAGE>   32

recent list furnished to it as provided in Section 6.1 and as to the names and
addresses of holders of Debentures received by the Trustee in its capacity as
registrar for the Debentures (if acting in such capacity).

        (b) The Trustee may destroy any list furnished to it as provided in
Section 6.1 upon receipt of a new list so furnished.

        (c) Debentureholders may communicate as provided in Section 312(b) of
the Trust Indenture Act with other Debenture holders with respect to their
rights under this Indenture or under the Debentures and the Trustee shall comply
with its obligations under Section 312(b) of the Trust Indenture Act.

        (d) Every Debentureholder, by receiving and holding the same, agrees
with the Company and the Trustee that neither the Company nor the Trustee nor
any agent of either of them shall be held accountable by reason of the
disclosure of information as to the names and addresses of the Debentureholders
made pursuant to the Trust Indenture Act.

SECTION 6.3 REPORTS BY THE COMPANY.

        (a) The Company covenants and agrees to file with the Trustee, within 15
days after the Company is required to file the same with the Commission, copies
of the annual reports and of the information, documents and other reports (or
copies of such portions of any of the foregoing as the Commission may from time
to time by rules and regulations prescribe) that the Company may be required to
file with the Commission pursuant to Section 13 or Section 15(d) of the Exchange
Act; or, if the Company is not required to file information, documents or
reports pursuant to either of such sections, then to file with the Trustee and
the Commission, in accordance with the rules and regulations prescribed from
time to time by the Commission, such of the supplementary and periodic
information, documents and reports that may be required pursuant to Section 13
of the Exchange Act in respect of a security listed and registered on a national
securities exchange or the applicable self-regulatory organization as may be
prescribed from time to time in such rules and regulations.

        (b) The Company covenants and agrees to file with the Trustee and the
Commission, in accordance with the rules and regulations prescribed from to time
by the Commission, such additional information, documents and reports with
respect to compliance by the Company with the conditions and covenants provided
for in this Indenture as may be required from time to time by such rules and
regulations, including Section 314(a)(4) of the Trust Indenture Act.

        (c) The Company covenants and agrees to transmit by mail, first class
postage prepaid, or the reputable over-night delivery service that provides for
evidence of receipt, to the Debenture holders, as their names and addresses
appear upon the Debenture Register, within 30 days after the filing thereof with
the Trustee, such summaries of any information, documents and reports required
to be filed by the Company pursuant to subsections (a) and (b) of this Section
6.3 as may be required by rules and regulations prescribed from time to time by
the Commission.

                                       24
<PAGE>   33

SECTION 6.4 REPORTS BY THE TRUSTEE.

        (a) On or before July 15 in each year in which any of the Debentures are
Outstanding, the Trustee shall transmit by mail, first class postage prepaid, to
the Debenture holders, as their names and addresses appear upon the Debenture
Register, a brief report dated as of the preceding May 15, if and to the extent
required under Section 313(a) of the Trust Indenture Act.

        (b) The Trustee shall comply with Section 313(b) and 313(c) of the Trust
Indenture Act.

        (c) A copy of each such report shall, at the time of such transmission
to Debenture holders, be filed by the Trustee with the Company, with each stock
exchange or applicable self-regulatory organization upon which any Debentures
are listed (if so listed) and also with the Commission. The Company agrees to
notify the Trustee when any Debentures become listed on any stock exchange
applicable self-regulatory organization.

                                  ARTICLE VII.

                  REMEDIES OF THE TRUSTEE AND DEBENTUREHOLDERS
                               ON EVENT OF DEFAULT

SECTION 7.1 EVENTS OF DEFAULT.

        (a) Whenever used herein with respect to the Debentures, "Event of
Default" means any one or more of the following events that has occurred and is
continuing:

                (i) the Company defaults in the payment of any installment of
        interest upon any of the Debentures, as and when the same shall become
        due and payable, and continuance of such default for a period of 30
        days; provided, however, that a valid extension of an interest payment
        period by the Company in accordance with the terms of this Indenture
        shall not constitute a default in the payment of interest for this
        purpose;

                (ii) the Company defaults in the payment of the principal on the
        Debentures as and when the same shall become due and payable whether at
        maturity, upon redemption, by declaration or otherwise;

                (iii) the Company fails to observe or perform any other of its
        covenants or agreements with respect to the Debentures for a period of
        90 days after the date on which written notice of such failure,
        requiring the same to be remedied and stating that such notice is a
        "Notice of Default" hereunder, shall have been given to the Company by
        the Trustee, by registered or certified mail, or to the Company and the
        Trustee by the holders of at least 25% in principal amount of the
        Debentures at the time Outstanding;

                (iv) the Company pursuant to or within the meaning of any
        Bankruptcy Law commences a voluntary case; (ii) consents to the entry of
        an order for relief against it in an involuntary case; (iii) consents to
        the appointment of a Custodian of it or for all or substantially all of
        its property; or (iv) makes a general assignment for the benefit of its
        creditors;

                                       25
<PAGE>   34

                (v) a court of competent jurisdiction enters an order under any
        Bankruptcy Law that (i) is for relief against the Company in an
        involuntary case; (ii) appoints a Custodian of the Company for all or
        substantially all of its property; or (iii) orders the liquidation of
        the Company, and the order or decree remains unstayed and in effect for
        60 days; or

                (vi) the Trust shall have voluntarily or involuntarily
        dissolved, wound-up its business or otherwise terminated its existence
        except in connection with (i) the distribution of Debentures to holders
        of Trust Securities in liquidation of their interests in the Trust; (ii)
        the redemption of all of the outstanding Trust Securities of the Trust;
        or (iii) certain mergers, consolidations or amalgamations, each as
        permitted by the Trust Agreement.

        (b) In each and every such case referred to in paragraph (i) through
(vi) of Section 7.1(a), unless the principal of all the Debentures shall have
already become due and payable, either the Trustee or the holders of not less
than 25% in aggregate principal amount of the Debentures then Outstanding
hereunder, by notice in writing to the Company (and to the Trustee if given by
such Debenture holders) may declare the principal of all the Debentures to be
due and payable immediately, and upon any such declaration the same shall become
and shall be immediately due and payable, notwithstanding anything contained in
this Indenture or in the Debentures.

        (c) At any time after the principal of the Debentures shall have been so
declared due and payable, and before any judgment or decree for the payment of
the moneys due shall have been obtained or entered as hereinafter provided, the
holders of a majority in aggregate principal amount of the Debentures then
Outstanding hereunder, by written notice to the Company and the Trustee, may
rescind and annul such declaration and its consequences if: (i) the Company has
paid or deposited with the Trustee a sum sufficient to pay all matured
installments of interest upon all the Debentures and the principal of any and
all Debentures that shall have become due otherwise than by acceleration (with
interest upon such principal, and, to the extent that such payment is
enforceable under applicable law, upon overdue installments of interest, at the
rate per annum expressed in the Debentures to the date of such payment or
deposit) and the amount payable to the Trustee under Section 9.7; and (ii) any
and all Events of Default under this Indenture, other than the nonpayment of
principal on Debentures that shall not have become due by their terms, shall
have been remedied or waived as provided in Section 7.6. No such rescission and
annulment shall extend to or shall affect any subsequent default or impair any
right consequent thereon.

        (d) In case the Trustee shall have proceeded to enforce any right with
respect to Debentures under this Indenture and such proceedings shall have been
discontinued or abandoned because of such rescission or annulment or for any
other reason or shall have been determined adversely to the Trustee, then and in
every such case the Company and the Trustee shall be restored respectively to
their former positions and rights hereunder, and all rights, remedies and powers
of the Company and the Trustee shall continue as though no such proceedings had
been taken.

                                       26
<PAGE>   35

SECTION 7.2 COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT BY TRUSTEE.

        (a) The Company covenants that (1) in case it shall default in the
payment of any installment of interest on any of the Debentures, and such
default shall have continued for a period of 90 Business Days; or (2) in case it
shall default in the payment of the principal of any of the Debentures when the
same shall have become due and payable, whether upon maturity of the Debentures
or upon redemption or upon declaration or otherwise, then, upon demand of the
Trustee, the Company shall pay to the Trustee, for the benefit of the holders of
the Debentures, the whole amount that then shall have been become due and
payable on all such Debentures for principal or interest, or both, as the case
may be, with interest upon the overdue principal and (to the extent that payment
of such interest is enforceable under applicable law and, if the Debentures are
held by the Trust or a trustee of the Trust, without duplication of any other
amounts paid by the Trust or trustee in respect thereof) upon overdue
installments of interest at the rate per annum expressed in the Debentures; and,
in addition thereto, such further amount as shall be sufficient to cover the
costs and expenses of collection, and the amount payable to the Trustee under
Section 9.7.

        (b) If the Company shall fail to pay such amounts forthwith upon such
demand, the Trustee, in its own name and as trustee of an express trust, shall
be entitled and empowered to institute any action or proceedings at law or
inequity for the collection of the sums so due and unpaid, and may prosecute any
such action or proceeding to judgment or final decree, and may enforce any such
judgment or final decree against the Company or other obligor upon the
Debentures and collect the moneys adjudged or decreed to be payable in the
manner provided by law out of the property of the Company or other obligor upon
the Debentures, wherever situated.

        (c) In case of any receivership, insolvency, liquidation, bankruptcy,
reorganization, readjustment, arrangement, composition or judicial proceedings
affecting the Company or the creditors or property of either, the Trustee shall
have power to intervene in such proceedings and take any action therein that
maybe permitted by the court and shall (except as may be otherwise provided by
law) be entitled to file such proofs of claim and other papers and documents as
maybe necessary or advisable in order to have the claims of the Trustee and of
the holders of the Debentures allowed for the entire amount due and payable by
the Company under this Indenture at the date of institution of such proceedings
and for any additional amount that may become due and payable by the Company
after such date, and to collect and receive any moneys or other property payable
or deliverable on any such claim, and to distribute the same after the deduction
of the amount payable to the Trustee under Section 9.7; and any receiver,
assignee or trustee in bankruptcy or reorganization is hereby authorized by each
of the holders of the Debentures to make such payments to the Trustee, and, in
the event that the Trustee shall consent to the making of such payments directly
to such Debenture holders, to pay to the Trustee any amount due it under Section
9.7.

        (d) All rights of action and of asserting claims under this Indenture,
or under any of the terms established with respect to Debentures, may be
enforced by the Trustee without the possession of any of such Debentures, or the
production thereof at any trial or other proceeding relative thereto, and any
such suit or proceeding instituted by the Trustee shall be brought in its own
name as trustee of an express trust, and any recovery of judgment shall, after
provision for

                                       27
<PAGE>   36

payment to the Trustee of any amounts due under Section 9.7, be for the ratable
benefit of the holders of the Debentures. In case of an Event of Default
hereunder, the Trustee may in its discretion proceed to protect and enforce the
rights vested in it by this Indenture by such appropriate judicial proceedings
as the Trustee shall deem most effectual to protect and enforce any of such
rights, either at law or in equity or in bankruptcy or otherwise, whether for
the specific enforcement of any covenant or agreement contained in this
Indenture or in aid of the exercise of any power granted in this Indenture, or
to enforce any other legal or equitable right vested in the Trustee by this
Indenture or by law. Nothing contained herein shall be deemed to authorize the
Trustee to authorize or consent to or accept or adopt on behalf of any Debenture
holder any plan of reorganization, arrangement, adjustment or composition
affecting the Debentures or the rights of any holder thereof or to authorize the
Trustee to vote in respect of the claim of any Debenture holder in any such
proceeding.

SECTION 7.3 APPLICATION OF MONEYS COLLECTED.

        Any moneys or other assets collected by the Trustee pursuant to this
Article VII with respect to the Debentures shall be applied in the following
order, at the date or dates fixed by the Trustee and, in case of the
distribution of such moneys or other assets on account of principal or interest,
upon presentation of the Debentures, and notation thereon the payment, if only
partially paid, and upon surrender thereof if fully paid:

        FIRST: To the payment of costs and expenses of collection and of all
amounts payable to the Trustee under Section 9.7;

        SECOND: To the payment of all Senior Indebtedness of the Company if and
to the extent required by Article XVI; and

        THIRD: To the payment of the amounts then due and unpaid upon the
Debentures for principal and interest, in respect of which or for the benefit of
which such money has been collected, ratably, without preference or priority of
any kind, according to the amounts due and payable on such Debentures for
principal and interest, respectively.

SECTION 7.4 LIMITATION ON SUITS.

        (a) Except as set forth herein, no holder of any Debenture shall have
any right by virtue or by availing of any provision of this Indenture to
institute any suit, action or proceeding in equity or at law upon or under or
with respect to this Indenture or for the appointment of a receiver or trustee,
or for any other remedy hereunder, unless (i) such holder previously shall have
given to the Trustee written notice of an Event of Default and of the
continuance thereof with respect to the Debentures specifying such Event of
Default, as herein before provided; (ii) the holders of not less than 25% in
aggregate principal amount of the Debentures then Outstanding shall have made
written request upon the Trustee to institute such action, suit or proceeding in
its own name as trustee hereunder; (iii) such holder or holders shall have
offered to the Trustee such reasonable indemnity as it may require against the
costs, expenses and liabilities to be incurred therein or thereby; (iv) the
Trustee for 60 days after its receipt of such notice, request and offer of
indemnity, shall have failed to institute any such action, suit or proceeding;

                                       28
<PAGE>   37

and (v) during such 60 day period, the holders of a majority in principal amount
of the Debentures do not give the Trustee a direction inconsistent with the
request.

        (b) Notwithstanding anything contained herein to the contrary or any
other provisions of this Indenture, the right of any holder of the Debentures to
receive payment of the principal of and interest on the Debentures, as therein
provided, on or after the respective due dates expressed in such Debenture (or
in the case of redemption, on the redemption date), or to institute suit for the
enforcement of any such payment on or after such respective dates or redemption
date, shall not be impaired or affected without the consent of such holder and
by accepting a Debenture hereunder it is expressly understood, intended and
covenanted by the taker and holder of every Debenture with every other such
taker and holder and the Trustee, that no one or more holders of Debentures
shall have any right in any manner whatsoever by virtue or by availing of any
provision of this Indenture to affect, disturb or prejudice the rights of the
holders of any other of such Debentures, or to obtain or seek to obtain priority
over or preference to any other such holder, or to enforce any right under this
Indenture, except in the manner herein provided and for the equal, ratable and
common benefit of all holders of Debentures. For the protection and enforcement
of the provisions of this Section 7.4, each and every Debentureholder and the
Trustee shall be entitled to such relief as can be given either at law or
inequity.

SECTION 7.5 RIGHTS AND REMEDIES CUMULATIVE; DELAY OR OMISSION NOT WAIVER.

        (a) Except as otherwise provided in Section 2.8(a), all powers and
remedies given by this Article VII to the Trustee or to the Debenture holders
shall, to the extent permitted by law, be deemed cumulative and not exclusive of
any other powers and remedies available to the Trustee or the holders of the
Debentures, by judicial proceedings or otherwise, to enforce the performance or
observance of the covenants and agreements contained in this Indenture or
otherwise established with respect to such Debentures.

        (b) No delay or omission of the Trustee or of any holder of any of the
Debentures to exercise any right or power accruing upon any Event of Default
occurring and continuing as aforesaid shall impair any such right or power, or
shall be construed to be a waiver of any such default or on acquiescence there
in; and, subject to the provisions of Section 7.4, every power and remedy given
by this Article VII or by law to the Trustee or the Debenture holders maybe
exercised from time to time, and as often as shall be deemed expedient, by the
Trustee or by the Debenture holders.

SECTION 7.6 CONTROL BY DEBENTUREHOLDERS.

        The holders of a majority in aggregate principal amount of the
Debentures at the time Outstanding, determined in accordance with Section 10.4,
shall have the right to direct the time, method and place of conducting any
proceeding for any remedy available to the Trustee, or exercising any trust or
power conferred on the Trustee; provided, however, that such direction shall not
be in conflict with any rule of law or with this Indenture. Subject to the
provisions of Section 9.1, the Trustee shall have the right to decline to follow
any such direction if the Trustee in good faith shall, by a Responsible Officer
or Officers of the Trustee, determine that the proceeding so directed would
involve the Trustee in personal liability. The holders of a majority

                                       29
<PAGE>   38

in aggregate principal amount of the Debentures at the time Outstanding affected
thereby, determined in accordance with Section 10.4, may on behalf of the
holders of all of the Debentures waive any past default in the performance of
any of the covenants contained herein and its consequences, except (i) a default
in the payment of the principal of or interest on, any of the Debentures as and
when the same shall become due by the terms of such Debentures otherwise than by
acceleration (unless such default has been cured and a sum sufficient to pay all
matured installments of interest and principal has been deposited with the
Trustee (in accordance with Section 7.1(c)); or (ii) in respect of a covenant or
provision hereof which cannot be modified or amended without the consent of the
holder of each Outstanding Debenture affected; provided, however, that if the
Debentures are held by the Trust or a trustee of the Trust, such waiver or
modification to such waiver shall not be effective until the holders of a
majority in liquidation preference of Trust Securities of the Trust shall have
consented to such waiver or modification to such waiver; provided further, that
if the consent of the holder of each Outstanding Debenture is required, such
waiver shall not be effective until each holder of the Trust Securities of the
Trust shall have consented to such waiver. Upon any such waiver, the default
covered thereby shall be deemed to be cured for all purposes of this Indenture
and the Company, the Trustee and the holders of the Debentures shall be restored
to their former positions and rights hereunder, respectively; but no such waiver
shall extend to any subsequent or other default or impair any right consequent
thereon.

SECTION 7.7 UNDERTAKING TO PAY COSTS.

        All parties to this Indenture agree, and each holder of any Debentures
by such holder's acceptance thereof shall be deemed to have agreed, that any
court may in its discretion require, in any suit for the enforcement of any
right or remedy under this Indenture, or in any suit against the Trustee for any
action taken or omitted by it as Trustee, the filing by any party litigant in
such suit of an undertaking to pay the costs of such suit, and that such court
may in its discretion assess reasonable costs, including reasonable attorneys'
fees, against any party litigant in such suit, having due regard to the merits
and good faith of the claims or defenses made by such party litigant; but the
provisions of this Section 7.7 shall not apply to any suit instituted by the
Trustee, to any suit instituted by any Debenture holder, or group of Debenture
holders holding more than 10% in aggregate principal amount of the Outstanding
Debentures, or to any suit instituted by any Debenture holder for the
enforcement of the payment of the principal of or interest on the Debentures, on
or after the respective due dates expressed in such Debenture or established
pursuant to this Indenture.

SECTION 7.8 DIRECT ACTION; RIGHT OF SET-OFF.

        In the event that an Event of Default has occurred and is continuing and
such event is attributable to the failure of the Company to pay interest on or
principal of the Debentures on the payment date on which such payment is due and
payable, then a holder of Trust Preferred Securities may institute a legal
proceeding directly against the Company for enforcement of payment to such
holder of the principal of or interest on such Debentures having a principal
amount equal to the aggregate Liquidation Amount of the Trust Preferred
Securities of such holder (a "Direct Action"). In connection with such Direct
Action, the Company will have aright of set-off under this Indenture to the
extent of any payment made by the Company to such holder of the Trust Preferred
Securities with respect to such Direct Action. The Company may not

                                       30
<PAGE>   39

amend this Indenture to remove this right to institute a suit directly against
the Company without the prior consent of the holders of all the Trust Preferred
Securities.

                                  ARTICLE VIII.

                      FORM OF DEBENTURE AND ORIGINAL ISSUE

SECTION 8.1 FORM OF DEBENTURE.

        The Debenture and the Trustee's Certificate of Authentication to be
endorsed thereon are to be substantially in the forms contained as Exhibit A to
this Indenture, attached hereto and incorporated herein by reference.

SECTION 8.2 ORIGINAL ISSUE OF DEBENTURES.

        Debentures in the aggregate principal amount of $_________ may, upon
execution of this Indenture, be executed by the Company and delivered to the
Trustee for authentication. The Trustee shall thereupon authenticate and deliver
said Debentures to or upon the written order of the Company, signed by its
president, or any vice president and its treasurer or an assistant treasurer,
without any further action by the Company.

                                   ARTICLE IX.

                             CONCERNING THE TRUSTEE

SECTION 9.1 CERTAIN DUTIES AND RESPONSIBILITIES OF THE TRUSTEE.

        (a) The Trustee, prior to the occurrence of an Event of Default and
after the curing of all Events of Default that may have occurred, shall
undertake to perform with respect to the Debentures such duties and only such
duties as are specifically set forth in this Indenture, and no implied covenants
shall be read into this Indenture against the Trustee. In case an Event of
Default has occurred that has not been cured or waived, the Trustee shall
exercise such of the rights and powers vested in it by this Indenture, and use
the same degree of care and skill in their exercise, as a prudent Person would
exercise or use under the circumstances in the conduct of its own affairs.

        (b) No provision of this Indenture shall be construed to relieve the
Trustee from liability for its own negligent action, its own negligent failure
to act, or its own willful misconduct, except that:

                (i) prior to the occurrence of an Event of Default and after the
        curing or waiving of all such Events of Default that may have occurred:

                        (1) the duties and obligations of the Trustee shall with
                respect to the Debentures be determined solely by the express
                provisions of this Indenture, and the Trustee shall not be
                liable with respect to the Debentures except for the performance
                of such duties and obligations as are specifically set forth in
                this

                                       31
<PAGE>   40

                Indenture, and no implied covenants or obligations shall be read
                into this Indenture against the Trustee; and

                        (2) in the absence of bad faith on the part of the
                Trustee, the Trustee may with respect to the Debentures
                conclusively rely, as to the truth of the statements and the
                correctness of the opinions expressed therein, upon any
                certificates or opinions furnished to the Trustee and conforming
                to the requirements of this Indenture; but in the case of any
                such certificates or opinions that by any provision hereof are
                specifically required to be furnished to the Trustee, the
                Trustee shall be under a duty to examine the same to determine
                whether or not they conform to the requirements of this
                Indenture;

                (ii) the Trustee shall not be liable for any error of judgment
        made in good faith by a Responsible Officer or Responsible Officers of
        the Trustee, unless it shall be proved that the Trustee was negligent in
        ascertaining the pertinent facts;

                (iii) the Trustee shall not be liable with respect to any action
        taken or omitted to be taken by it in good faith in accordance with the
        direction of the holders of not less than a majority in principal amount
        of the Debentures at the time Outstanding relating to the time, method
        and place of conducting any proceeding for any remedy available to the
        Trustee, or exercising any trust or power conferred upon the Trustee
        under this Indenture with respect to the Debentures; and

                (iv) none of the provisions contained in this Indenture shall
        require the Trustee to expend or risk its own funds or otherwise incur
        personal financial liability in the performance of any of its duties or
        in the exercise of any of its rights or powers, if there is reasonable
        ground for believing that the repayment of such funds or liability is
        not reasonably assured to it under the terms of this Indenture or
        adequate indemnity against such risk is not reasonably assured to it.

SECTION 9.2 NOTICE OF DEFAULTS.

        Within five business days after actual knowledge by a Responsible
Officer of the Trustee of the occurrence of any default hereunder with respect
to the Debentures, the Trustee shall transmit by mail to all holders of the
Debentures, as their names and addresses appear in the Debenture Register,
notice of such default, unless such default shall have been cured or waived;
provided, however, that, except in the case of default in the payment of the
principal or interest (including any Additional Payments and Compounded
Interest, if any) on any Debenture, the Trustee shall be protected in
withholding such notice if and so long as the board of directors, the executive
committee or a trust committee of the directors and/or Responsible Officers of
the Trustee determines in good faith that the withholding of such notice is in
the interests of the holders of such Debentures; and provided, further, that in
the case of any default of the character specified in Section 7.1(a)(iii), no
such notice to holders of Debentures need be sent until at least 30 days after
the occurrence thereof. For the purposes of this Section 9.2, the term "default"
means any event which is, or after notice or lapse of time or both, would
become, an Event of Default with respect to the Debentures.

                                       32
<PAGE>   41

SECTION 9.3 CERTAIN RIGHTS OF TRUSTEE.

        Except as otherwise provided in Section 9.1:

        (a) The Trustee may rely and shall be protected in acting or refraining
from acting upon any resolution, certificate, statement, instrument, opinion,
report, notice, request, consent, order, approval, bond, security or other paper
or document believed by it to be genuine and to have been signed or presented by
the proper party or parties;

        (b) Any request, direction, order or demand of the Company mentioned
herein shall be sufficiently evidenced by a Board Resolution or an instrument
signed in the name of the Company by its president or any vice president and by
the secretary or an assistant secretary or the treasurer or an assistant
treasurer thereof (unless other evidence in respect thereof is specifically
prescribed herein);

        (c) The Trustee shall not be deemed to have knowledge of a default or an
Event of Default, other than an Event of Default specified in Section 7.1(a)(i)
or (ii), unless and until it receives written notification of such Event of
Default from the Company or by holders of at least 25% of the principal amount
of the Debentures at the time Outstanding;

        (d) The Trustee may consult with counsel and the written advice of such
counsel or any Opinion of Counsel shall be full and complete authorization and
protection in respect of any action taken or suffered or omitted hereunder in
good faith and in reliance thereon;

        (e) The Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request, order or
direction of any of the Debenture holders, pursuant to the provisions of this
Indenture, unless such Debenture holders shall have offered to the Trustee
reasonable security or indemnity against the costs, expenses and liabilities
that may be incurred therein or thereby; nothing contained herein shall,
however, relieve the Trustee of the obligation, upon the occurrence of an Event
of Default (that has not been cured or waived) to exercise with respect to the
Debentures such of the rights and powers vested in it by this Indenture, and to
use the same degree of care and skill in their exercise, as a prudent man would
exercise or use under the circumstances in the conduct of his own affairs;

        (f) The Trustee shall not be liable for any action taken or omitted to
be taken by it in good faith and believed by it to be authorized or within the
discretion or rights or powers conferred upon it by this Indenture;

        (g) The Trustee shall not be bound to make any investigation into the
facts or matters stated in any resolution, certificate, statement, instrument,
opinion, report, notice, request, consent, order, approval, bond, security, or
other papers or documents, unless requested in writing to do so by the holders
of not less than a majority in principal amount of the Outstanding Debentures
(determined as provided in Section 10.4); provided, however, that if the payment
within a reasonable time to the Trustee of the costs, expenses or liabilities
likely to be incurred by it in the making of such investigation is, in the
opinion of the Trustee, not reasonably assured to the Trustee by the security
afforded to it by the terms of this Indenture, the Trustee may require
reasonable indemnity against such costs, expenses or liabilities as a condition
to so

                                       33
<PAGE>   42

proceeding. The reasonable expense of every such examination shall be paid by
the Company or, if paid by the Trustee, shall be repaid by the Company upon
demand; and

        (h) The Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder.

SECTION 9.4 TRUSTEE NOT RESPONSIBLE FOR RECITALS, ETC.

        (a) The Recitals contained herein and in the Debentures shall be taken
as the statements of the Company, and the Trustee assumes no responsibility for
the correctness of the same.

        (b) The Trustee makes no representations as to the validity or
sufficiency of this Indenture or of the Debentures.

        (c) The Trustee shall not be accountable for the use or application by
the Company of any of the Debentures or of the proceeds of such Debentures, or
for the use or application of any moneys paid over by the Trustee in accordance
with any provision of this Indenture, or for the use or application of any
moneys received by any paying agent other than the Trustee.

SECTION 9.5 MAY HOLD DEBENTURES.

        The Trustee or any paying agent or registrar for the Debentures, in its
individual or any other capacity, may become the owner or pledgee of Debentures
with the same rights it would have if it were not Trustee, paying agent or
Debenture Registrar.

SECTION 9.6 MONEYS HELD IN TRUST.

        Subject to the provisions of Section 13.5, all moneys received by the
Trustee shall, until used or applied as herein provided, be held in trust for
the purposes for which they were received, but need not be segregated from other
funds except to the extent required by law. The Trustee shall be under no
liability for interest on any moneys received by it hereunder except such as it
may agree with the Company to pay thereon.

SECTION 9.7 COMPENSATION AND REIMBURSEMENT.

        (a) The Company covenants and agrees to pay to the Trustee, and the
Trustee shall be entitled to, such compensation (which shall not be limited by
any provision of law in regard to the compensation of a trustee of an express
trust), as the Company and the Trustee may from time to time agree in writing,
for all services rendered by it in the execution of the trusts hereby created
and in the exercise and performance of any of the powers and duties hereunder of
the Trustee, and, except as otherwise expressly provided herein, the Company
shall pay or reimburse the Trustee upon its request for all reasonable expenses,
disbursements and advances incurred or made by the Trustee in accordance with
any of the provisions of this Indenture (including the reasonable compensation
and the expenses and disbursements of its counsel and of all Persons not
regularly in its employ) except any such expense, disbursement or advance as may
arise from

                                       34
<PAGE>   43

its negligence or bad faith. The Company also covenants to indemnify the Trustee
(and its officers, agents, directors and employees) for, and to hold it harmless
against, any loss, liability, claim, action, suit, cost or expense incurred
without negligence or bad faith on the part of the Trustee and arising out of or
in connection with the acceptance or administration of this trust, including the
costs and expenses of defending itself against any claim of liability in the
premises.

        (b) The obligations of the Company under this Section 9.7 to compensate
and indemnify the Trustee and to pay or reimburse the Trustee for expenses,
disbursements and advances shall constitute additional indebtedness hereunder.
Such additional indebtedness shall be secured by a lien prior to that of the
Debentures upon all property and funds held or collected by the Trustee as such,
except funds held in trust for the benefit of the holders of particular
Debentures.

SECTION 9.8 RELIANCE ON OFFICERS' CERTIFICATE.

        Except as otherwise provided in Section 9.1, whenever in the
administration of the provisions of this Indenture the Trustee shall deem it
necessary or desirable that a matter be proved or established prior to taking or
suffering or omitting to take any action hereunder, such matter (unless other
evidence in respect thereof be herein specifically prescribed) may, in the
absence of negligence or bad faith on the part of the Trustee, be deemed to be
conclusively proved and established by an Officers' Certificate delivered to the
Trustee and such certificate, in the absence of negligence or bad faith on the
part of the Trustee, shall be full warrant to the Trustee for any action taken,
suffered or omitted to be taken by it under the provisions of this Indenture
upon the faith thereof.

SECTION 9.9 DISQUALIFICATION; CONFLICTING INTERESTS.

        If the Trustee has or shall acquire any "conflicting interest" within
the meaning of Section 310(b) of the Trust Indenture Act, the Trustee and the
Company shall in all respects comply with the provisions of Section 310(b) of
the Trust Indenture Act.

SECTION 9.10 CORPORATE TRUSTEE REQUIRED; ELIGIBILITY.

        There shall at all times be a Trustee with respect to the Debentures
issued hereunder which shall at all times be a corporation organized and doing
business under the laws of the United States of America or any State or
Territory there of or of the District of Columbia, or a corporation or other
Person permitted to act as trustee by the Commission, authorized under such laws
to exercise corporate trust powers, having a combined capital and surplus of at
least $50,000,000, and subject to supervision or examination by federal, state,
territorial, or District of Columbia authority. If such corporation publishes
reports of condition at least annually, pursuant to law or to the requirements
of the aforesaid supervising or examining authority, then for the purposes of
this Section 9.10, the combined capital and surplus of such corporation shall be
deemed to be its combined capital and surplus as set forth in its most recent
report of condition so published. The Company may not, nor may any Person
directly or indirectly controlling, controlled by, or under common control with
the Company, serve as Trustee. In case at any time the Trustee shall cease to be
eligible in accordance with the provisions of this Section

                                       35
<PAGE>   44

9.10, the Trustee shall resign immediately in the manner and with the effect
specified in Section 9.11.

SECTION 9.11 RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR.

        (a) The Trustee or any successor hereafter appointed, may at any time
resign by giving written notice thereof to the Company and by transmitting
notice of resignation by mail, first class postage prepaid, to the Debenture
holders, as their names and addresses appear upon the Debenture Register. Upon
receiving such notice of resignation, the Company shall promptly appoint a
successor trustee with respect to Debentures by written instrument, in
duplicate, executed by order of the Board of Directors, one copy of which
instrument shall be delivered to the resigning Trustee and one copy to the
successor trustee. If no successor trustee shall have been so appointed and have
accepted appointment within 30 days after the mailing of such notice of
resignation, the resigning Trustee may petition any court of competent
jurisdiction for the appointment of a successor trustee with respect to
Debentures, or any Debenture holder who has been a bona fide holder of a
Debenture or Debentures for at least six months may, subject to the provisions
of Section 9.9, on behalf of himself and all others similarly situated, petition
any such court for the appointment of a successor trustee. Such court may
thereupon after such notice, if any, as it may deem proper and prescribe,
appoint a successor trustee.

        (b) In case at any time any one of the following shall occur:

                (i) the Trustee shall fail to comply with the provisions of
        Section 9.9 after written request therefor by the Company or by any
        Debenture holder who has been a bona fide holder of a Debenture or
        Debentures for at least six months; or

                (ii) the Trustee shall cease to be eligible in accordance with
        the provisions of Section 9.10 and shall fail to resign after written
        request therefor by the Company or by any such Debenture holder; or

                (iii) the Trustee shall become incapable of acting, or shall be
        adjudged a bankrupt or insolvent, or commence a voluntary bankruptcy
        proceeding, or a receiver of the Trustee or of its property shall be
        appointed or consented to, or any public officer shall take charge or
        control of the Trustee or of its property or affairs for the purpose of
        rehabilitation, conservation or liquidation;

        then, in any such case, the Company may remove the Trustee with respect
        to all Debentures and appoint a successor trustee by written instrument,
        in duplicate, executed by order of the Board of Directors, one copy of
        which instrument shall be delivered to the Trustee so removed and one
        copy to the successor trustee, or, subject to the provisions of Sections
        9.9 and 9.10, unless the Trustee's duty to resign is stayed as provided
        herein, any Debentureholder who has been a bona fide holder of a
        Debenture or Debentures for at least six months may, on behalf of that
        holder and all others similarly situated, petition any court of
        competent jurisdiction for the removal of the Trustee and the
        appointment of a successor trustee. Such court may thereupon after such
        notice, if any, as it may deem proper and prescribe, remove the Trustee
        and appoint a successor trustee.

                                       36
<PAGE>   45

        (c) The holders of a majority in aggregate principal amount of the
Debentures at the time Outstanding may at any time remove the Trustee by so
notifying the Trustee and the Company and may appoint a successor Trustee with
the consent of the Company.

        (d) Any resignation or removal of the Trustee and appointment of a
successor trustee with respect to the Debentures pursuant to any of the
provisions of this Section 9.11 shall become effective upon acceptance of
appointment by the successor trustee as provided in Section 9.12.

        (e) Any successor trustee appointed pursuant to this Section 9.11 may be
appointed with respect to the Debentures, and at any time there shall be only
one Trustee with respect to the Debentures.

SECTION 9.12 ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.

        (a) In case of the appointment hereunder of a successor trustee with
respect to the Debentures, every successor trustee so appointed shall execute,
acknowledge and deliver to the Company and to the retiring Trustee an instrument
accepting such appointment, and thereupon the resignation or removal of the
retiring Trustee shall become effective and such successor trustee, without any
further act, deed or conveyance, shall become vested with all the rights,
powers, trusts and duties of the retiring Trustee; but, on the request of the
Company or the successor trustee, such retiring Trustee shall, upon payment of
its charges, execute and deliver an instrument transferring to such successor
trustee all the rights, powers, and trusts of the retiring Trustee and shall
duly assign, transfer and deliver to such successor trustee all property and
money held by such retiring Trustee hereunder.

        (b) Upon request of any successor trustee, the Company shall execute and
all instruments for more fully and certainly vesting in and confirming to such
successor trustee all such rights, powers and trusts referred to in paragraph
(a) of this Section 9.12.

        (c) No successor trustee shall accept its appointment unless at the time
of such acceptance such successor trustee shall be qualified and eligible under
this Article IX.

        (d) Upon acceptance of appointment by a successor trustee as provided in
this Section 9.12, the Company shall transmit notice of the succession of such
trustee hereunder by mail, first class postage prepaid, to the Debentureholders,
as their names and addresses appear upon the Debenture Register. If the Company
fails to transmit such notice within ten days after acceptance of appointment by
the successor trustee, the successor trustee shall cause such notice to be
transmitted at the expense of the Company.

SECTION 9.13 MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO BUSINESS.

        Any corporation into which the Trustee may be merged or converted or
with which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which the Trustee shall be a party, or any
corporation succeeding to the corporate trust business of the Trustee, shall be
the successor of the Trustee hereunder, provided that such corporation shall be
qualified under the provisions of Section 9.9 and eligible under the

                                       37
<PAGE>   46

provisions of Section 9.10, without the execution or filing of any paper or any
further act on the part of any of the parties hereto, anything herein to the
contrary notwithstanding. In case any Debentures shall have been authenticated,
but not delivered, by the Trustee then in office, any successor by merger,
conversion or consolidation to such authenticating Trustee may adopt such
authentication and deliver the Debentures so authenticated with the same effect
as if such successor Trustee had itself authenticated such Debentures.

SECTION 9.14 PREFERENTIAL COLLECTION OF CLAIMS AGAINST THE COMPANY.

        The Trustee shall comply with Section 311(a) of the Trust Indenture Act,
excluding any creditor relationship described in Section 311(b) of the Trust
Indenture Act. A Trustee who has resigned or been removed shall be subject to
Section 311(a) of the Trust Indenture Act to the extent included therein.

                                   ARTICLE X.

                         CONCERNING THE DEBENTUREHOLDERS

SECTION 10.1 EVIDENCE OF ACTION BY HOLDERS.

        (a) Whenever in this Indenture it is provided that the holders of a
majority or specified percentage in aggregate principal amount of the Debentures
may take any action (including the making of any demand or request, the giving
of any notice, consent or waiver or the taking of any other action), the fact
that at the time of taking any such action the holders of such majority or
specified percentage have joined therein may be evidenced by any instrument or
any number of instruments of similar tenor executed by such holders of
Debentures in Person or by agent or proxy appointed in writing.

        (b) If the Company shall solicit from the Debenture holders any request,
demand, authorization, direction, notice, consent, waiver or other action, the
Company may, at its option, as evidenced by an Officers' Certificate, fix in
advance a record date for the determination of Debentureholders entitled to give
such request, demand, authorization, direction, notice, consent, waiver or other
action, but the Company shall have no obligation to do so. If such a record date
is fixed, such request, demand, authorization, direction, notice, consent,
waiver or other action may be given before or after the record date, but only
the Debentureholders of record at the close of business on the record date shall
be deemed to be Debentureholders for the purposes of determining whether
Debentureholders of the requisite proportion of Outstanding Debentures have
authorized or agreed or consented to such request, demand, authorization,
direction, notice, consent, waiver or other action, and for that purpose the
Outstanding Debentures shall be computed as of the record date; provided,
however, that no such authorization, agreement or consent by such
Debentureholders on the record date shall be deemed effective unless it shall
become effective pursuant to the provisions of this Indenture not later than six
months after the record date.

SECTION 10.2 PROOF OF EXECUTION BY DEBENTUREHOLDERS.

        Subject to the provisions of Section 9.1, proof of the execution of any
instrument by a Debentureholder (such proof shall not require notarization) or
his agent or proxy and proof of the

                                       38
<PAGE>   47

holding by any Person of any of the Debentures shall be sufficient if made in
the following manner:

        (a) The fact and date of the execution by any such Person of any
instrument may be proved in any reasonable manner acceptable to the Trustee.

        (b) The ownership of Debentures shall be proved by the Debenture
Register of such Debentures or by a certificate of the Debenture Registrar
thereof.

        (c) The Trustee may require such additional proof of any matter referred
to in this Section 10.2 as it shall deem necessary.

SECTION 10.3 WHO MAY BE DEEMED OWNERS.

        Prior to the due presentment for registration of transfer of any
Debenture, the Company, the Trustee, any paying agent, any Authenticating Agent
and any Debenture Registrar may deem and treat the Person in whose name such
Debenture shall be registered upon the books of the Company as the absolute
owner of such Debenture (whether or not such Debenture shall be overdue and
notwithstanding any notice of ownership or writing thereon made by anyone other
than the Debenture Registrar) for the purpose of receiving payment of or on
account of the principal of and interest on such Debenture (subject to Section
2.3) and for all other purposes; and neither the Company nor the Trustee nor any
paying agent nor any Authenticating Agent nor any Debenture Registrar shall be
affected by any notice to the contrary.

SECTION 10.4 CERTAIN DEBENTURES OWNED BY COMPANY DISREGARDED.

        In determining whether the holders of the requisite aggregate principal
amount of Debentures have concurred in any direction, consent or waiver under
this Indenture, the Debentures that are owned by the Company or any other
obligor on the Debentures or by any Person directly or indirectly controlling or
controlled by or under common control with the Company or any other obligor on
the Debentures shall be disregarded and deemed not to be Outstanding for the
purpose of any such determination, except that (i) for the purpose of
determining whether the Trustee shall be protected in relying on any such
direction, consent or waiver, only Debentures that the Trustee actually knows
are so owned shall be so disregarded and (ii) for the purpose of this Section
10.4, the Trust shall be deemed not to be controlled by the Company. The
Debentures so owned that have been pledged in good faith may be regarded as
Outstanding for the purposes of this Section 10.4 if the pledgee shall establish
to the satisfaction of the Trustee the pledgee's right so to act with respect to
such Debentures and that the pledgee is not a Person directly or indirectly
controlling or controlled by or under direct or indirect common control with the
Company or any such other obligor. In case of a dispute as to such right, any
decision by the Trustee taken upon the advice of counsel shall be full
protection to the Trustee.

SECTION 10.5 ACTIONS BINDING ON FUTURE DEBENTUREHOLDERS.

        At any time prior to (but not after) the evidencing to the Trustee, as
provided in Section 10.1, of the taking of any action by the holders of the
majority or percentage in aggregate principal amount of the Debentures specified
in this Indenture in connection with such action,

                                       39
<PAGE>   48

any holder of a Debenture that is shown by the evidence to be included in the
Debentures the holders of which have consented to such action may, by filing
written notice with the Trustee, and upon proof of holding as provided in
Section 10.2, revoke such action so far as concerns such Debenture. Except as
aforesaid any such action taken by the holder of any Debenture shall be
conclusive and binding upon such holder and upon all future holders and owners
of such Debenture, and of any Debenture issued in exchange therefor, on
registration of transfer thereof or in place thereof, irrespective of whether or
not any notation in regard thereto is made upon such Debenture. Any action taken
by the holders of the majority or percentage in aggregate principal amount of
the Debentures specified in this Indenture in connection with such action shall
be conclusively binding upon the Company, the Trustee and the holders of all the
Debentures.

                                   ARTICLE XI.

                             SUPPLEMENTAL INDENTURES

SECTION 11.1 SUPPLEMENTAL INDENTURES WITHOUT THE CONSENT OF DEBENTUREHOLDERS.

        In addition to any supplemental indenture otherwise authorized by this
Indenture, the Company and the Trustee may from time to time and at any time
enter into an indenture or indentures supplemental hereto (which shall conform
to the provisions of the Trust Indenture Act as then in effect), without the
consent of the Debentureholders, for one or more of the following purposes:

        (a) to cure any ambiguity, defect, or inconsistency herein, in the
Debentures;

        (b) to evidence a consolidation or merger involving the Company as
permitted under Section 12.1;

        (c) to provide for uncertificated Debentures in addition to or in place
of certificated Debentures;

        (d) to add to the covenants of the Company for the benefit of the
holders of all or any of the Debentures or to surrender any right or power
herein conferred upon the Company;

        (e) to add to, delete from, or revise the conditions, limitations, and
restrictions on the authorized amount, terms, or purposes of issue,
authentication, and delivery of Debentures, only as herein set forth;

        (f) to make any change that does not adversely affect the rights of any
Debentureholder in any material respect;

        (g) to provide for the issuance of and establish the form and terms and
conditions of the Debentures, to establish the form of any certifications
required to be furnished pursuant to the terms of this Indenture or of the
Debentures, or to add to the rights of the holders of the Debentures;

                                       40
<PAGE>   49

        (h) or qualify or maintain the qualification of this Indenture under the
Trust Indenture Act.

        The Trustee is hereby authorized to join with the Company in the
execution of any such supplemental indenture, and to make any further
appropriate agreements and stipulations that may be therein contained, but the
Trustee shall not be obligated to enter into any such supplemental indenture
that affects the Trustee's own rights, duties or immunities under this Indenture
or otherwise. Any supplemental indenture authorized by the provisions of this
Section 11.1 may be executed by the Company and the Trustee without the consent
of the holders of any of the Debentures at the time Outstanding, notwithstanding
any of the provisions of Section 11.2.

SECTION 11.2 SUPPLEMENTAL INDENTURES WITH CONSENT OF DEBENTUREHOLDERS.

        With the consent (evidenced as provided in Section 10.1) of the holders
of not less than a majority in aggregate principal amount of the Debentures at
the time Outstanding, the Company, when authorized by Board Resolutions, and the
Trustee may from time to time and at any time enter into an indenture or
indentures supplemental hereto (which shall conform to the provisions of the
Trust Indenture Act as then in effect) for the purpose of adding any provisions
to or changing in any manner or eliminating any of the provisions of this
Indenture or of any supplemental indenture or of modifying in any manner not
covered by Section 11.1 the rights of the holders of the Debentures under this
Indenture; provided, however, that no such supplemental indenture shall without
the consent of the holders of each Debenture then Outstanding and affected
thereby, (i) extend the fixed maturity of any Debentures, reduce the principal
amount thereof, or reduce the rate or extend the time of payment of interest
thereon, without the consent of the holder of each Debenture so affected; or
(ii) reduce the aforesaid percentage of Debentures, the holders of which are
required to consent to any such supplemental indenture; provided further, that
if the Debentures are held by the Trust or a trustee of the Trust, such
supplemental indenture shall not be effective until the holders of a majority in
liquidation preference of Trust Securities of the Trust shall have consented to
such supplemental indenture; provided further, that if the consent of the holder
of each Outstanding Debenture is required, such supplemental indenture shall not
be effective until each holder of the Trust Securities of the Trust shall have
consented to such supplemental indenture. It shall not be necessary for the
consent of the Debentureholders affected thereby under this Section 11.2 to
approve the particular form of any proposed supplemental indenture, but it shall
be sufficient if such consent shall approve the substance thereof.

SECTION 11.3 EFFECT OF SUPPLEMENTAL INDENTURES.

        Upon the execution of any supplemental indenture pursuant to the
provisions of this Article XI, this Indenture shall be and be deemed to be
modified and amended in accordance therewith and the respective rights,
limitations of rights, obligations, duties and immunities under this Indenture
of the Trustee, the Company and the holders of Debentures shall thereafter be
determined, exercised and enforced hereunder subject in all respects to such
modifications and amendments, and all the terms and conditions of any such
supplemental indenture shall be and be deemed to be part of the terms and
conditions of this Indenture for any and all purposes.

                                       41
<PAGE>   50

SECTION 11.4 DEBENTURES AFFECTED BY SUPPLEMENTAL INDENTURES.

        Debentures affected by a supplemental indenture, authenticated and
delivered after the execution of such supplemental indenture pursuant to the
provisions of this Article XI, may bear a notation in form approved by the
Company, provided such form meets the requirements of any exchange upon which
the Debentures may be listed, as to any matter provided for in such supplemental
indenture. If the Company shall so determine, new Debentures so modified as to
conform, in the opinion of the Board of Directors of the Company, to any
modification of this Indenture contained in any such supplemental indenture
maybe prepared by the Company, authenticated by the Trustee and delivered in
exchange for the Debentures then Outstanding.

SECTION 11.5 EXECUTION OF SUPPLEMENTAL INDENTURES.

        (a) Upon the request of the Company, accompanied by their Board
Resolutions authorizing the execution of any such supplemental indenture, and
upon the filing with the Trustee of evidence of the consent of Debentureholders
required to consent thereto as aforesaid, the Trustee shall join with the
Company in the execution of such supplemental indenture unless such supplemental
indenture affects the Trustee's own rights, duties or immunities under this
Indenture or otherwise, in which case the Trustee may in its discretion but
shall not be obligated to enter into such supplemental indenture. The Trustee,
subject to the provisions of Section 9.1, may receive an Opinion of Counsel as
conclusive evidence that any supplemental indenture executed pursuant to this
Article XI is authorized or permitted by, and conforms to, the terms of this
Article XI and that it is proper for the Trustee under the provisions of this
Article XI to join in the execution thereof.

        (b) Promptly after the execution by the Company and the Trustee of any
supplemental indenture pursuant to the provisions of this Section 11.5, the
Trustee shall transmit by mail, first class postage prepaid, a notice, setting
forth in general terms the substance of such supplemental indenture, to the
Debentureholders as their names and addresses appear upon the Debenture
Register. Any failure of the Trustee to mail such notice, or any defect therein,
shall not, however, in any way impair or affect the validity of any such
supplemental indenture.

                                  ARTICLE XII.

                              SUCCESSOR CORPORATION

SECTION 12.1 COMPANY MAY CONSOLIDATE, ETC.

        Nothing contained in this Indenture or in any of the Debentures shall
prevent any consolidation or merger of the Company with or into any other
corporation or corporations (whether or not affiliated with the Company, as the
case may be), or successive consolidations or mergers in which the Company, as
the case may be, or its successor or successors shall be a party or parties, or
shall prevent any sale, conveyance, transfer or other disposition of the
property of the Company, as the case may be, or its successor or successors as
an entirety, or substantially as an entirety, to any other corporation (whether
or not affiliated with the Company, as the case may be, or its successor or
successors) authorized to acquire and operate the same; provided, however, the
Company hereby covenants and agrees that, (i) upon any such consolidation,

                                       42
<PAGE>   51

merger, sale, conveyance, transfer or other disposition, the due and punctual
payment, in the case of the Company, of the principal of and interest on all of
the Debentures, according to their tenor and the due and punctual performance
and observance of all the covenants and conditions of this Indenture to be kept
or performed by the Company as the case may be, shall be expressly assumed, by
supplemental indenture (which shall conform to the provisions of the Trust
Indenture Act, as then in effect) satisfactory in form to the Trustee executed
and delivered to the Trustee by the entity formed by such consolidation, or into
which the Company, as the case may be, shall have been merged, or by the entity
which shall have acquired such property; (ii) in case the Company consolidates
with or merges into another Person or conveys or transfers its properties and
assets substantially then as an entirety to any Person, the successor Person is
organized under the laws of the United States or any state or the District of
Columbia; and (iii) immediately after giving effect thereto, an Event of
Default, and no event which, after notice or lapse of time or both, would become
an Event of Default, shall have occurred and be continuing.

SECTION 12.2 SUCCESSOR CORPORATION SUBSTITUTED.

        (a) In case of any such consolidation, merger, sale, conveyance,
transferor other disposition and upon the assumption by the successor
corporation, by supplemental indenture, executed and delivered to the Trustee
and satisfactory in form to the Trustee, of, in the case of the Company, the due
and punctual payment of the principal of and interest on all of the Debentures
Outstanding and the due and punctual performance of all of the covenants and
conditions of this Indenture to be performed by the Company, as the case may be,
such successor corporation shall succeed to and be substituted for the Company,
with the same effect as if it had been named as the Company herein, and
thereupon the predecessor corporation shall be relieved of all obligations and
covenants under this Indenture and the Debentures.

        (b) In case of any such consolidation, merger, sale, conveyance,
transferor other disposition such changes in phraseology and form (but not in
substance) may be made in the Debentures thereafter to be issued as may be
appropriate.

        (c) Nothing contained in this Indenture or in any of the Debentures
shall prevent the Company from merging into itself or acquiring by purchase or
otherwise all or any part of the property of any other Person (whether or not
affiliated with the Company).

SECTION 12.3 EVIDENCE OF CONSOLIDATION, ETC.TO TRUSTEE.

        The Trustee, subject to the provisions of Section 9.1, may receive an
Opinion of Counsel as conclusive evidence that any such consolidation, merger,
sale, conveyance, transfer or other disposition, and any such assumption, comply
with the provisions of this Article XII.

                                  ARTICLE XIII.

                           SATISFACTION AND DISCHARGE

SECTION 13.1 SATISFACTION AND DISCHARGE OF INDENTURE.

        If at any time: (a) the Company shall have delivered to the Trustee for
cancellation all Debentures theretofore authenticated (other than any Debentures
that shall have been destroyed,

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<PAGE>   52

lost or stolen and that shall have been replaced or paid as provided in Section
2.8) and Debentures for whose payment money or Governmental Obligations have
theretofore been deposited in trust or segregated and held in trust by the
Company (and thereupon repaid to the Company or discharged from such trust, as
provided in Section 13.5); or (b) all such Debentures not theretofore delivered
to the Trustee for cancellation shall have become due and payable, or are by
their terms to become due and payable within one year or are to be called for
redemption within one year under arrangements satisfactory to the Trustee for
the giving of notice of redemption, and the Company shall deposit or cause to be
deposited with the Trustee as trust funds the entire amount in moneys or
Governmental Obligations sufficient or a combination thereof, sufficient in the
opinion of a nationally recognized firm of independent public accountants
expressed in a written certification thereof delivered to the Trustee, to pay at
maturity or upon redemption all Debentures not theretofore delivered to the
Trustee for cancellation, including principal and interest due or to become due
to such date of maturity or date fixed for redemption, as the case may be, and
if the Company shall also pay or cause to be paid all other sums payable
hereunder by the Company; then this Indenture shall thereupon cease to be of
further effect except for the provisions of Sections 2.3, 2.6, 2.8, 5.1, 5.2,
5.3 and 9.7, that shall survive until the date of maturity or redemption date,
as the case may be, and Sections 9.7 and 13.5, that shall survive to such date
and thereafter, and the Trustee, on demand of the Company and at the cost and
expense of the Company, shall execute proper instruments acknowledging
satisfaction of and discharging this Indenture

SECTION 13.2 DISCHARGE OF OBLIGATIONS.

        If at any time all Debentures not heretofore delivered to the Trustee
for cancellation or that have not become due and payable as described in Section
13.1 shall have been paid by the Company by depositing irrevocably with the
Trustee as trust funds moneys or an amount of Governmental Obligations
sufficient in the opinion of a nationally recognized certified public accounting
firm to pay at maturity or upon redemption all Debentures not theretofore
delivered to the Trustee for cancellation, including principal and interest due
or to become due to such date of maturity or date fixed for redemption, as the
case may be, and if the Company shall also pay or cause to be paid all other
sums payable hereunder by the Company, then after the date such moneys or
Governmental Obligations, as the case may be, are deposited with the Trustee,
the obligations of the Company under this Indenture shall cease to be of further
effect except for the provisions of Sections 2.3, 2.6, 2.8, 5.1, 5.2, 5.3, 9.6,
9.7 and 13.5 hereof that shall survive until such Debentures shall mature and be
paid. Thereafter, Sections 9.7 and 13.5 shall survive.

SECTION 13.3 DEPOSITED MONIES TO BE HELD IN TRUST.

        All monies or Governmental Obligations deposited with the Trustee
pursuant to Sections 13.1 or 13.2 shall be held in trust and shall be available
for payment as due, either directly or through any paying agent (including the
Company acting as its own paying agent), to the holders of the Debentures for
the payment or redemption of which such moneys or Governmental Obligations have
been deposited with the Trustee.

                                       44
<PAGE>   53

SECTION 13.4 PAYMENT OF MONIES HELD BY PAYING AGENTS.

        In connection with the satisfaction and discharge of this Indenture, all
moneys or Governmental Obligations then held by any paying agent under the
provisions of this Indenture shall, upon demand of the Company, be paid to the
Trustee and thereupon such paying agent shall be released from all further
liability with respect to such moneys or Governmental Obligations.

SECTION 13.5 REPAYMENT TO COMPANY.

        Any monies or Governmental Obligations deposited with any paying agent
or the Trustee, or then held by the Company in trust, for payment of principal
of or interest on the Debentures that are not applied but remain unclaimed by
the holders of such Debentures for at least two years after the date upon which
the principal of or interest on such Debentures shall have respectively become
due and payable, shall be repaid to the Company, as the case may be, on May 31
of each year or (if then held by the Company) shall be discharged from such
trust; and thereupon the paying agent and the Trustee shall be released from all
further liability with respect to such monies or Governmental Obligations, and
the holder of any of the Debentures entitled to receive such payment shall
thereafter, as an unsecured general creditor, look only to the Company for the
payment thereof.

                                  ARTICLE XIV.

                IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS
                                  AND DIRECTORS

SECTION 14.1 NO RECOURSE.

        No recourse under or upon any obligation, covenant or agreement of this
Indenture, or of the Debentures, or for any claim based thereon or otherwise in
respect thereof, shall be had against any incorporator, stockholder, officer or
director, past, present or future as such, of the Company or of any predecessor
corporation, either directly or through the Company or any such predecessor
corporation, whether by virtue of any constitution, statute or rule of law, or
by the enforcement of any assessment or penalty or otherwise; it being expressly
understood that this Indenture and the obligations issued hereunder are solely
corporate obligations, and that no such personal liability whatever shall attach
to, or is or shall be incurred by, the incorporators, stockholders, officers or
directors as such, of the Company or of any predecessor corporation, or any of
them, because of the creation of the indebtedness hereby authorized, or under or
by reason of the obligations, covenants or agreements contained in this
Indenture or in any of the Debentures or implied there from; and that any and
all such personal liability of every name and nature, either at common law or in
equity or by constitution or statute, of, and any and all such rights and claims
against, every such incorporator, stockholder, officer or director as such,
because of the creation of the indebtedness hereby authorized, or under or by
reason of the obligations, covenants or agreements contained in this Indenture
or in any of the Debentures or implied there from, are hereby expressly waived
and released as a condition of, and as a consideration for, the execution of
this Indenture and the issuance of such Debentures.

                                       45
<PAGE>   54

                                   ARTICLE XV.

                            MISCELLANEOUS PROVISIONS

SECTION 15.1 EFFECT ON SUCCESSORS AND ASSIGNS.

        All the covenants, stipulations, promises and agreements in this
Indenture contained by or on behalf of the Company shall bind their respective
successors and assigns, whether so expressed or not.

SECTION 15.2 ACTIONS BY SUCCESSOR.

        Any act or proceeding by any provision of this Indenture authorized or
required to be done or performed by any board, committee or officer of the
Company shall and may be done and performed with like force and effect by the
corresponding board, committee or officer of any corporation that shall at the
time be the lawful sole successor of the Company.

SECTION 15.3 SURRENDER OF COMPANY POWERS.

        The Company by instrument in writing executed by appropriate authority
of its Board of Directors and delivered to the Trustee may surrender any of the
powers reserved to the Company, and thereupon such power so surrendered shall
terminate both as to the Company, as the case may be, and as to any successor
corporation.

SECTION 15.4 NOTICES.

        Except as otherwise expressly provided herein any notice or demand that
by any provision of this Indenture is required or permitted to be given or
served by the Trustee or by the holders of Debentures to or on the Company may
be given or served by being deposited first class postage prepaid in a
post-office letterbox addressed (until another address is filed in writing by
the Company with the Trustee), as follows: Glacier Bancorp, Inc., 49 Commons
Loop, Kalispell, Montana 59901, Attention: Michael J. Blodnick, President and
Chief Executive Officer. Any notice, election, request or demand by the Company
or any Debentureholder to or upon the Trustee shall be deemed to have been
sufficiently given or made, for all purposes, if given or made in writing at the
Corporate Trust Office of the Trustee.

SECTION 15.5 GOVERNING LAW.

        This Indenture and each Debenture shall be deemed to be a contract made
under the internal laws of the State of Delaware and for all purposes shall be
construed in accordance with the laws of said State.

SECTION 15.6 TREATMENT OF DEBENTURES AS DEBT.

        It is intended that the Debentures shall be treated as indebtedness and
not as equity for federal income tax purposes. The provisions of this Indenture
shall be interpreted to further this intention.

                                       46
<PAGE>   55

SECTION 15.7 COMPLIANCE CERTIFICATES AND OPINIONS.

        (a) Upon any application or demand by the Company to the Trustee to take
any action under any of the provisions of this Indenture, the Company shall
furnish to the Trustee an Officers' Certificate stating that all conditions
precedent provided for in this Indenture relating to the proposed action have
been complied with and an Opinion of Counsel stating that in the opinion of such
counsel all such conditions precedent have been complied with, except that in
the case of any such application or demand as to which the furnishing of such
documents is specifically required by any provision of this Indenture relating
to such particular application or demand, no additional certificate or opinion
need be furnished.

        (b) Each certificate or opinion of the Company provided for in this
Indenture and delivered to the Trustee with respect to compliance with a
condition or covenant in this Indenture shall include (1) a statement that the
Person making such certificate or opinion has read such covenant or condition;
(2) a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions contained in such
certificate or opinion are based; (3) a statement that, in the opinion of such
Person, he has made such examination or investigation as, in the opinion of such
Person, is necessary to enable him to express an informed opinion as to whether
or not such covenant or condition has been complied with; and (4) a statement as
to whether or not, in the opinion of such Person, such condition or covenant has
been complied with; provided, however, that each such certificate shall comply
with the provisions of Section 314 of the Trust Indenture Act.

SECTION 15.8 PAYMENTS ON BUSINESS DAYS.

        In any case where the date of maturity of interest or principal of any
Debenture or the date of redemption of any Debenture shall not be a Business
Day, then payment of interest or principal may be made on the next succeeding
Business Day with the same force and effect as if made on the nominal date of
maturity or redemption, and no interest shall accrue for the period after such
nominal date.

SECTION 15.9 CONFLICT WITH TRUST INDENTURE ACT.

        If and to the extent that any provision of this Indenture limits,
qualifies or conflicts with the duties imposed by Sections 310 to 317,
inclusive, of the Trust Indenture Act, such imposed duties shall control.

SECTION 15.10 COUNTERPARTS.

        This Indenture may be executed in any number of counterparts, each of
which shall be an original, but such counterparts shall together constitute but
one and the same instrument.

SECTION 15.11 SEPARABILITY.

        In case any one or more of the provisions contained in this Indenture or
in the Debentures shall for any reason be held to be invalid, illegal or
unenforceable in any respect, such invalidity, illegality or unenforceability
shall not affect any other provisions of this Indenture or of the

                                       47
<PAGE>   56

Debentures, but this Indenture and the Debentures shall be construed as if such
invalid or illegal or unenforceable provision had never been contained herein or
therein.

SECTION 15.12 ASSIGNMENT.

        The Company shall have the right at all times to assign any of its
respective rights or obligations under this Indenture to a direct or indirect
wholly owned Subsidiary of the Company, provided that, in the event of any such
assignment, the Company shall remain liable for all such obligations. Subject to
the foregoing, this Indenture is binding upon and inures to the benefit of the
parties thereto and their respective successors and assigns. This Indenture may
not otherwise be assigned by the parties thereto.

SECTION 15.13 ACKNOWLEDGMENT OF RIGHTS.

        The Company acknowledges that, with respect to any Debentures held by
the Trust or a trustee of the Trust, if the Property Trustee fails to enforce
its rights under this Indenture as the holder of the Debentures held as the
assets of the Trust, any holder of Trust Preferred Securities may, to the extent
permitted under applicable law, institute legal proceedings directly against the
Company to enforce such Property Trustee's rights under this Indenture without
first instituting any legal proceedings against such Property Trustee or any
other person or entity. Notwithstanding the foregoing, if an Event of Default
has occurred and is continuing and such event is attributable to the failure of
the Company to pay interest or principal on the Debentures on the date such
interest or principal is otherwise payable (or in the case of redemption, on the
redemption date), the Company acknowledges that a holder of Trust Preferred
Securities may directly institute a proceeding for enforcement of payment to
such holder of the principal of or interest on the Debentures having a principal
amount equal to the aggregate liquidation amount of the Trust Preferred
Securities of such holder on or after the respective due date specified in the
Debentures.

                                  ARTICLE XVI.

                           SUBORDINATION OF DEBENTURES

SECTION 16.1 AGREEMENT TO SUBORDINATE.

        The Company covenants and agrees, and each holder of Debentures issued
hereunder by such holder's acceptance thereof likewise covenants and agrees,
that all Debentures shall be issued subject to the provisions of this Article
XVI; and each holder of a Debenture, whether upon original issue or upon
transfer or assignment thereof, accepts and agrees to be bound by such
provisions. The payment by the Company of the principal of and interest on all
Debentures issued hereunder shall, to the extent and in the manner herein after
set forth, be subordinated and junior in right of payment to the prior payment
in full of all Senior Debt, Subordinated Debt and Additional Senior Obligations
(collectively, "Senior Indebtedness") to the extent provided herein, whether
outstanding at the date of this Indenture or thereafter incurred. No provision
of this Article XVI shall prevent the occurrence of any default or Event of
Default hereunder.

                                       48
<PAGE>   57

SECTION 16.2 DEFAULT ON SENIOR DEBT, SUBORDINATED DEBT OR ADDITIONAL SENIOR
OBLIGATIONS.

        In the event and during the continuation of any default by the Company
in the payment of principal, premium, interest or any other payment due on any
Senior Indebtedness of the Company, or in the event that the maturity of any
Senior Indebtedness of the Company has been accelerated because of a default,
then, in either case, no payment shall be made by the Company with respect to
the principal (including redemption payments) of or interest on the Debentures.
In the event that, notwithstanding the foregoing, any payment shall be received
by the Trustee when such payment is prohibited by the preceding sentence of this
Section 16.2, such payment shall be held in trust for the benefit of, and shall
be paid over or delivered to, the holders of Senior Indebtedness or their
respective representatives, or to the trustee or trustees under any indenture
pursuant to which any of such Senior Indebtedness may have been issued, as their
respective interests may appear, but only to the extent that the holders of the
Senior Indebtedness (or their representative or representatives or a trustee)
notify the Trustee in writing within 90 days of such payment of the amounts then
due and owing on the Senior Indebtedness and only the amounts specified in such
notice to the Trustee shall be paid to the holders of Senior Indebtedness.

SECTION 16.3 LIQUIDATION; DISSOLUTION; BANKRUPTCY.

        (a) Upon any payment by the Company or distribution of assets of the
Company of any kind or character, whether in cash, property or securities, to
creditors upon any dissolution or winding-up or liquidation or reorganization of
the Company, whether voluntary or involuntary or in bankruptcy, insolvency,
receivership or other proceedings, all amounts due upon all Senior Indebtedness
of the Company shall first be paid in full, or payment thereof provided for in
money in accordance with its terms, before any payment is made by the Company on
account of the principal or interest on the Debentures; and upon any such
dissolution or winding-up or liquidation or reorganization, any payment by the
Company, or distribution of assets of the Company of any kind or character,
whether in cash, property or securities, to which the holders of the Debentures
or the Trustee would be entitled to receive from the Company, except for the
provisions of this Article XVI, shall be paid by the Company or by any receiver,
trustee in bankruptcy, liquidating trustee, agent or other Person making such
payment or distribution, or by the holders of the Debentures or by the Trustee
under this Indenture if received by them or it, directly to the holders of
Senior Indebtedness of the Company (pro rata to such holders on the basis of the
respective amounts of Senior Indebtedness held by such holders, as calculated by
the Company) or their representative or representatives, or to the trustee or
trustees under any indenture pursuant to which any instruments evidencing such
Senior Indebtedness may have been issued, as their respective interests may
appear, to the extent necessary to pay such Senior Indebtedness in full, in
money or money's worth, after giving effect to any concurrent payment or
distribution to or for the holders of such Senior Indebtedness, before any
payment or distribution is made to the holders of Debentures or to the Trustee.

        (b) In the event that, notwithstanding the foregoing, any payment or
distribution of assets of the Company of any kind or character, whether in cash,
property or securities, prohibited by the foregoing, shall be received by the
Trustee before all Senior Indebtedness of the Company is paid in full, or
provision is made for such payment in money in accordance with its terms, such
payment or distribution shall be held in trust for the benefit of and shall be
paid

                                       49
<PAGE>   58

over or delivered to the holders of such Senior Indebtedness or their
representative or representatives, or to the trustee or trustees under any
indenture pursuant to which any instruments evidencing such Senior Indebtedness
may have been issued, and their respective interests may appear, as calculated
by the Company, for application to the payment of all Senior Indebtedness of the
Company, as the case may be, remaining unpaid to the extent necessary to pay
such Senior Indebtedness in full in money in accordance with its terms, after
giving effect to any concurrent payment or distribution to or for the benefit of
the holders of such Senior Indebtedness.

        (c) For purposes of this Article XVI, the words "cash, property or
securities" shall not be deemed to include shares of stock of the Company as
reorganized or readjusted, or securities of the Company or any other corporation
provided for by a plan of reorganization or readjustment, the payment of which
is subordinated at least to the extent provided in this Article XVI with respect
to the Debentures to the payment of all Senior Indebtedness of the Company, as
the case may be, that may at the time be outstanding, provided that (i) such
Senior Indebtedness is assumed by the new corporation, if any, resulting from
any such reorganization or readjustment; and (ii) the rights of the holders of
such Senior Indebtedness are not, without the consent of such holders, altered
by such reorganization or readjustment. The consolidation of the Company with,
or the merger of the Company into, another corporation or the liquidation or
dissolution of the Company following the conveyance or transfer of its property
as an entirety, or substantially as an entirety, to another corporation upon the
terms and conditions provided for in Article XII shall not be deemed a
dissolution, winding-up, liquidation or reorganization for the purposes of this
Section 16.3 if such other corporation shall, as a part of such consolidation,
merger, conveyance or transfer, comply with the conditions stated in Article
XII. Nothing in Section 16.2 or in this Section 16.3 shall apply to claims of,
or payments to, the Trustee under or pursuant to Section 9.7.

SECTION 16.4 SUBROGATION.

        (a) Subject to the payment in full of all Senior Indebtedness of the
Company, the rights of the holders of the Debentures shall be subrogated to the
rights of the holders of such Senior Indebtedness to receive payments or
distributions of cash, property or securities of the Company, as the case maybe,
applicable to such Senior Indebtedness until the principal of and interest on
the Debentures shall be paid in full; and, for the purposes of such subrogation,
no payments or distributions to the holders of such Senior Indebtedness of any
cash, property or securities to which the holders of the Debentures or the
Trustee would be entitled except for the provisions of this Article XVI, and no
payment over pursuant to the provisions of this Article XVI to or for the
benefit of the holders of such Senior Indebtedness by holders of the Debentures
or the Trustee, shall, as between the Company, its creditors other than holders
of Senior Indebtedness of the Company, and the holders of the Debentures, be
deemed to be a payment by the Company to or on account of such Senior
Indebtedness. It is understood that the provisions of this Article XVI are and
are intended solely for the purposes of defining the relative rights of the
holders of the Debentures, on the one hand, and the holders of such Senior
Indebtedness on the other hand.

        (b) Nothing contained in this Article XVI or elsewhere in this Indenture
or in the Debentures is intended to or shall impair, as between the Company, its
creditors (other than the

                                       50
<PAGE>   59

holders of Senior Indebtedness of the Company), and the holders of the
Debentures, the obligation of the Company, which is absolute and unconditional,
to pay to the holders of the Debentures the principal of and interest on the
Debentures as and when the same shall become due and payable in accordance with
their terms, or is intended to or shall affect the relative rights of the
holders of the Debentures and creditors of the Company, as the case may be,
other than the holders of Senior Indebtedness of the Company, nor shall anything
herein or therein prevent the Trustee or the holder of any Debenture from
exercising all remedies otherwise permitted by applicable law upon default under
this Indenture, subject to the rights, if any, under this Article XVI of the
holders of such Senior Indebtedness in respect of cash, property or securities
of the Company, as the case may be, received upon the exercise of any such
remedy.

        (c) Upon any payment or distribution of assets of the Company referred
to in this Article XVI, the Trustee, subject to the provisions of Article IX,
and the holders of the Debentures shall be entitled to conclusively rely upon
any order or decree made by any court of competent jurisdiction in which such
dissolution, winding-up, liquidation or reorganization proceedings are pending,
or a certificate of the receiver, trustee in bankruptcy, liquidation trustee,
agent or other Person making such payment or distribution, delivered to the
Trustee or to the holders of the Debentures, for the purposes of ascertaining
the Persons entitled to participate in such distribution, the holders of Senior
Indebtedness and other indebtedness of the Company, as the case may be, the
amount thereof or payable thereon, the amount or amounts paid or distributed
thereon and all other facts pertinent thereto or to this Article XVI.

SECTION 16.5 TRUSTEE TO EFFECTUATE SUBORDINATION.

        Each holder of Debentures by such holder's acceptance thereof authorizes
and directs the Trustee on such holder's behalf to take such action as may be
necessary or appropriate to effectuate the subordination provided in this
Article XVI and appoints the Trustee such holder's attorney-in-fact for any and
all such purposes.

SECTION 16.6 NOTICE BY THE COMPANY.

        (a) The Company shall give prompt written notice to a Responsible
Officer of the Trustee of any fact known to the Company that would prohibit the
making of any payment of monies to or by the Trustee in respect of the
Debentures pursuant to the provisions of this Article XVI. Notwithstanding the
provisions of this Article XVI or any other provision of this Indenture, the
Trustee shall not be charged with knowledge of the existence of any facts that
would prohibit the making of any payment of monies to or by the Trustee in
respect of the Debentures pursuant to the provisions of this Article XVI, unless
and until a Responsible Officer of the Trustee shall have received written
notice thereof from the Company or a holder or holders of Senior Indebtedness or
from any trustee therefor; and before the receipt of any such written notice,
the Trustee, subject to the provisions of Section 9.1, shall be entitled in all
respects to assume that no such facts exist; provided, however, that if the
Trustee shall not have received the notice provided for in this Section 16.6 at
least two Business Days prior to the date upon which by the terms hereof any
money may become payable for any purpose (including, without limitation, the
payment of the principal of or interest on any Debenture), then, anything herein
contained to the contrary notwithstanding, the Trustee shall have full power and
authority to receive such money

                                       51
<PAGE>   60

and to apply the same to the purposes for which they were received, and shall
not be affected by any notice to the contrary that may be received by it within
two Business Days prior to such date.

        (b) The Trustee, subject to the provisions of Section 9.1, shall been
titled to conclusively rely on the delivery to it of a written notice by a
Person representing himself to be a holder of Senior Indebtedness of the Company
(or a trustee on behalf of such holder) to establish that such notice has been
given by a holder of such Senior Indebtedness or a trustee on behalf of any such
holder or holders. In the event that the Trustee determines in good faith that
further evidence is required with respect to the right of any Person as a holder
of such Senior Indebtedness to participate in any payment or distribution
pursuant to this Article XVI, the Trustee may request such Person to furnish
evidence to the reasonable satisfaction of the Trustee as to the amount of such
Senior Indebtedness held by such Person, the extent to which such Person is
entitled to participate in such payment or distribution and any other facts
pertinent to the rights of such Person under this Article XVI, and, if such
evidence is not furnished, the Trustee may defer any payment to such Person
pending judicial determination as to the right of such Person to receive such
payment.

SECTION 16.7 RIGHTS OF THE TRUSTEE; HOLDERS OF SENIOR INDEBTEDNESS.

        (a) The Trustee in its individual capacity shall be entitled to all the
rights set forth in this Article XVI in respect of any Senior Indebtedness at
any time held by it, to the same extent as any other holder of Senior
Indebtedness, and nothing in this Indenture shall deprive the Trustee of any of
its rights as such holder. The Trustee's right to compensation and reimbursement
of expenses as set forth in Section 9.7 shall not be subject to the
subordination provisions of this Article XVI.

        (b) With respect to the holders of Senior Indebtedness of the Company,
the Trustee undertakes to perform or to observe only such of its covenants and
obligations as are specifically set forth in this Article XVI, and no implied
covenants or obligations with respect to the holders of such Senior Indebtedness
shall be read into this Indenture against the Trustee. The Trustee shall not be
deemed to owe any fiduciary duty to the holders of such Senior Indebtedness and,
subject to the provisions of Section 9.1, the Trustee shall not be liable to any
holder of such Senior Indebtedness if it shall pay over or deliver to holders of
Debentures, the Company or any other Person money or assets to which any holder
of such Senior Indebtedness shall be entitled by virtue of this Article XVI or
otherwise.

SECTION 16.8 SUBORDINATION MAY NOT BE IMPAIRED.

        (a) No right of any present or future holder of any Senior Indebtedness
of the Company to enforce subordination as herein provided shall at any time in
anyway be prejudiced or impaired by any act or failure to act on the part of the
Company or by any act or failure to act, in good faith, by any such holder, or
by any noncompliance by the Company with the terms, provisions and covenants of
this Indenture, regardless of any knowledge thereof that any such holder may
have or otherwise be charged with.

        (b) Without in any way limiting the generality of the foregoing
paragraph, the holders of Senior Indebtedness of the Company may, at any time
and from time to time, without the

                                       52
<PAGE>   61

consent of or notice to the Trustee or the holders of the Debentures, without
incurring responsibility to the holders of the Debentures and without impairing
or releasing the subordination provided in this Article XVI or the obligations
hereunder of the holders of the Debentures to the holders of such Senior
Indebtedness, do any one or more of the following: (i) change the manner, place
or terms of payment or extend the time of payment of, or renew or alter, such
Senior Indebtedness, or otherwise amend or supplement in any manner such Senior
Indebtedness or any instrument evidencing the same or any agreement under which
such Senior Indebtedness is outstanding; (ii) sell, exchange, release or
otherwise deal with any property pledged, mortgaged or otherwise securing such
Senior Indebtedness; (iii) release any Person liable in any manner for the
collection of such Senior Indebtedness; and (iv) exercise or refrain from
exercising any rights against the Company and any other Person.

        IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed, all as of the day and year first above written.

                                            GLACIER BANCORP, INC.

                                            By:
                                               ---------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------

                                       53
<PAGE>   62

                                            WILMINGTON TRUST COMPANY, AS TRUSTEE

                                            By:
                                               ---------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------

                                       54
<PAGE>   63

                                    EXHIBIT A

                           (FORM OF FACE OF DEBENTURE)

                              GLACIER BANCORP, INC

               ________% SUBORDINATED DEBENTURE DUE _______, 2031

No. -D1-
                                                                    $___________

                                    CUSIP No.

        Glacier Bancorp, Inc., a Delaware corporation (the "Company," which term
includes any successor corporation under the Indenture hereinafter referred to),
for value received, hereby promises to pay to Wilmington Trust Company, as
Property Trustee under the Amended and Restated Trust Agreement, dated ________,
2001, relating to Glacier Capital Trust I (the "Property Trustee"), or
registered assigns, the principal sum of ______________________ Dollars
($____________) on _______, 2031 (the "Stated Maturity"), and to pay interest on
said principal sum from _________, 2001, or from the most recent interest
payment date (each such date, an "Interest Payment Date") to which interest has
been paid or duly provided for, quarterly (subject to deferral as set forth
herein) in arrears on March 31, June 30, September 30 and December 31 of each
year commencing March 31, 2001, at the rate of ________% per annum until the
principal hereof shall have become due and payable, and on any overdue principal
and (without duplication and to the extent that payment of such interest is
enforceable under applicable law) on any overdue installment of interest at the
same rate per annum compounded quarterly. The amount of interest payable on any
Interest Payment Date shall be computed on the basis of a 360-day year of twelve
30-day months. The amount of interest for any partial period shall be computed
on the basis of the number of days elapsed in a 360-day year of twelve 30-day
months. In the event that any date on which interest is payable on this
Debenture is not a business day, then payment of interest payable on such date
shall be made on the next succeeding day that is a business day (and without any
interest or other payment in respect of any such delay) except that, if such
business day is in the next succeeding calendar year, payment of such interest
will be made on the immediately preceding business day, in each case, with the
same force and effect as if made on such date. The interest installment so
payable, and punctually paid or duly provided for, on any Interest Payment Date
shall, as provided in the Indenture, be paid to the person in whose name this
Debenture (or one or more Predecessor Debentures, as defined in said Indenture)
is registered at the close of business on the regular record date for such
interest installment, which shall be the close of business on the business day
immediately preceding such Interest Payment Date unless otherwise provided in
the Indenture. Any such interest installment not punctually paid or duly
provided for shall forthwith cease to be payable to the registered holders on
such regular record date and may be paid to the Person in whose name this
Debenture (or one or more Predecessor Debentures) is registered at the close of
business on a special record date to be fixed by the Trustee for the payment of
such defaulted interest, notice whereof shall be given to the registered holders
of the Debentures not less than 10 days prior to such special record date, or
may be paid at any time in any other lawful manner not

<PAGE>   64

inconsistent with the requirements of any securities exchange on which the
Debentures may be listed, and upon such notice as may be required by such
exchange, all as more fully provided in the Indenture. The principal of and the
interest on this Debenture shall be payable at the office or agency of the
Trustee maintained for that purpose in any coin or currency of the United States
of America that at the time of payment is legal tender for payment of public and
private debts; provided, however, that payment of interest may be made at the
option of the Company by check mailed to the registered holder at such address
as shall appear in the Debenture Register. Notwithstanding the foregoing, so
long as the holder of this Debenture is the Property Trustee, the payment of the
principal of and interest on this Debenture shall be made at such place and to
such account as may be designated by the Trustee. The Stated Maturity may be
shortened at any time by the Company to any date not earlier than ________,
2001, subject to the Company having received prior approval of the Federal
Reserve if then required under applicable capital guidelines, policies or
regulations of the Federal Reserve.

        The indebtedness evidenced by this Debenture is, to the extent provided
in the Indenture, subordinate and junior in right of payment to the prior
payment in full of all Senior Indebtedness, and this Debenture is issued subject
to the provisions of the Indenture with respect thereto. Each holder of this
Debenture, by accepting the same, (a) agrees to and shall be bound by such
provisions; (b) authorizes and directs the Trustee on his or her behalf to take
such action as may be necessary or appropriate to acknowledge or effectuate the
subordination so provided; and (c) appoints the Trustee his or her
attorney-in-fact for any and all such purposes. Each holder hereof, by his or
her acceptance hereof, hereby waives all notice of the acceptance of the
subordination provisions contained herein and in the Indenture by each holder of
Senior Indebtedness, whether now outstanding or hereafter incurred, and waives
reliance by each such holder upon said provisions.

        This Debenture shall not be entitled to any benefit under the Indenture
hereinafter referred to, be valid or become obligatory for any purpose until the
Certificate of Authentication hereon shall have been signed by or on behalf of
the Trustee.

        The provisions of this Debenture are continued on the reverse side
hereof and such continued provisions shall for all purposes have the same effect
as though fully set forth at this place.

        IN WITNESS WHEREOF, the Company has caused this instrument to be
executed.

                                            Dated: ________, 2001
                                            GLACIER BANCORP, INC.

                                            By:
                                               ---------------------------------
                                            Name:
                                                 -------------------------------
                                            Title:
                                                  ------------------------------

                                       3
<PAGE>   65

                                     Attest:

                              By:__________________
                                      Name:
                                     Title:

                      FORM OF CERTIFICATE OF AUTHENTICATION

        This is one of the Debentures described in the within-mentioned
Indenture.

        Dated: ________, 2001

                      WILMINGTON TRUST COMPANY, as Trustee

                        By ______________________________
                                      Name:
                                     Title:

                          FORM OF REVERSE OF DEBENTURE

              ________% SUBORDINATED DEBENTURE DUE _________, 2031

                                   (CONTINUED)

        This Debenture is one of the subordinated debentures of the Company
(herein sometimes referred to as the "Debentures"), specified in the Indenture,
all issued or to be issued under and pursuant to an Indenture dated as of
________, 2001 (the "Indenture") duly executed and delivered between the Company
and Wilmington Trust Company, as Trustee (the "Trustee"), to which Indenture
reference is hereby made for a description of the rights, limitations of rights,
obligations, duties and immunities there under of the Trustee, the Company and
the holders of the Debentures. The Debentures are limited in aggregate principal
amount as specified in the Indenture.

        Because of the occurrence and continuation of a Special Event, in
certain circumstances, this Debenture may become due and payable at the
principal amount together with any interest accrued thereon (the "Redemption
Price"). The Redemption Price shall be paid prior to 12:00 noon, New York time,
on the date of such redemption or at such earlier time as the Company
determines. The Company shall have the right to redeem this Debenture at the
option of the Company, without premium or penalty, in whole or in part at
anytime on or after ________, 2006 (an "Optional Redemption"), or at any time in
certain circumstances upon the occurrence of a Special Event, at a Redemption
Price equal to 100% of the principal amount plus any accrued but unpaid
interest, to the date of such redemption. Any redemption pursuant to this
paragraph shall be made upon not less than 30 days or more than 60 days notice,
at the

                                       4
<PAGE>   66

Redemption Price. If the Debentures are only partially redeemed by the Company
pursuant to an Optional Redemption, the Debentures shall be redeemed pro rata or
by lot or by any other method utilized by the Trustee. In the event of
redemption of this Debenture in part only, a new Debenture or Debentures for the
unredeemed portion hereof shall be issued in the name of the holder hereof upon
the cancellation hereof. In case an Event of Default, as defined in the
Indenture, shall have occurred and be continuing, the principal of all of the
Debentures may be declared, and upon such declaration shall become, due and
payable, in the manner, with the effect and subject to the conditions provided
in the Indenture. The Indenture contains provisions permitting the Company and
the Trustee, with the consent of the holders of not less than a majority in
aggregate principal amount of the Debentures at the time outstanding, as defined
in the Indenture, to execute supplemental indentures for the purpose of adding
any provisions to or changing in any manner or eliminating any of the provisions
of the Indenture or of any supplemental indenture or of modifying in any manner
the rights of the holders of the Debentures; provided, however, that no such
supplemental indenture shall (i) extend the fixed maturity of the Debentures
except as provided in the Indenture, or reduce the principal amount thereof, or
reduce the rate or extend the time of payment of interest thereon, without the
consent of the holder of each Debenture so affected; or (ii) reduce the
aforesaid percentage of Debentures, the holders of which are required to consent
to any such supplemental indenture, without the consent of the holders of each
Debenture then outstanding and affected thereby. The Indenture also contains
provisions permitting the holders of a majority in aggregate principal amount of
the Debentures at the time outstanding, on behalf of all of the holders of the
Debentures, to waive any past default in the performance of any of the covenants
contained in the Indenture, or established pursuant to the Indenture, and its
consequences, except (i) a default in the payment of the principal of or
interest on any of the Debentures otherwise than by acceleration (unless such
default has been cured and a sum sufficient to pay all matured installments of
interest and principal has been deposited with the Trustee (in accordance with
the Indenture) or (ii) in respect of a covenant or provision of the Indenture
which cannot be modified or amended without the consent of the holder of each
Outstanding Debenture affected. Any such consent or waiver by the registered
holder of this Debenture (unless revoked as provided in the Indenture) shall be
conclusive and binding upon such holder and upon all future holders and owners
of this Debenture and of any Debenture issued in exchange here for or in place
hereof (whether by registration of transfer or otherwise), irrespective of
whether or not any notation of such consent or waiver is made upon this
Debenture.

        No reference herein to the Indenture and no provision of this Debenture
or of the Indenture shall alter or impair the obligation of the Company, which
is absolute and unconditional, to pay the principal and interest on this
Debenture at the time and place and at the rate and in the money herein
prescribed.

        Provided certain conditions are met, the Company shall have the right at
any time during the term of the Debentures and from time to time to extend the
interest payment period of such Debentures for up to 20 consecutive quarters
(each, an "Extended Interest Payment Period"), at the end of which period the
Company shall pay all interest then accrued and unpaid (together with interest
thereon at the rate specified for the Debentures to the extent that payment of
such interest is enforceable under applicable law). Before the termination of
any such Extended Interest Payment Period, so long as no Event of Default shall
have occurred and be continuing, the Company may further extend such Extended
Interest Payment Period, provided that such

                                       5
<PAGE>   67

Extended Interest Payment Period together with all such further extensions
thereof shall not exceed 20 consecutive quarters, extend beyond the Stated
Maturity or end on a date other than an Interest Payment Date. At the
termination of any such Extended Interest Payment Period and upon the payment of
all accrued and unpaid interest and any additional amounts then due and subject
to the foregoing conditions, the Company may commence a new Extended Interest
Payment Period.

        As provided in the Indenture and subject to certain limitations therein
set forth, this Debenture is transferable by the registered holder hereof on the
Debenture Register of the Company, upon surrender of this Debenture for
registration of transfer at the office or agency of the Trustee accompanied by a
written instrument or instruments of transfer in form satisfactory to the
Company or the Trustee duly executed by the registered holder hereof or his
attorney duly authorized in writing, and thereupon one or more new Debentures of
authorized denominations and for the same aggregate principal amount shall be
issued to the designated transferee or transferees. No service charge shall be
made for any such transfer, but the Company may require payment of a sum
sufficient to cover any tax or other governmental charge payable in relation
thereto.

        Prior to due presentment for registration of transfer of this Debenture,
the Company, the Trustee, any paying agent and the Debenture Registrar may deem
and treat the registered holder hereof as the absolute owner hereof (whether or
not this Debenture shall be overdue and notwithstanding any notice of ownership
or writing hereon made by anyone other than the Debenture Registrar) for the
purpose of receiving payment of or on account of the principal hereof and
interest due hereon and for all other purposes, and neither the Company nor the
Trustee nor any paying agent nor any Debenture Registrar shall be affected by
any notice to the contrary.

        No recourse shall be had for the payment of the principal of or the
interest on this Debenture, or for any claim based hereon, or otherwise in
respect hereof, or based on or in respect of the Indenture, against any
incorporator, stockholder, officer or director, past, present or future, as
such, of the Company or of any predecessor or successor corporation, whether by
virtue of any constitution, statute or rule of law, or by the enforcement of any
assessment or penalty or otherwise, all such liability being, by the acceptance
hereof and as part of the consideration for the issuance hereof, expressly
waived and released.

        The Debentures are issuable only in registered form without coupons in
denominations of $25.00 and any integral multiple thereof.

        All terms used in this Debenture that are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

                                       6

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