Exhibit 4.13

                        DEBENTURE SUBSCRIPTION AGREEMENT

         DEBENTURE  SUBSCRIPTION  AGREEMENT,  dated  as of June 16,  2006  (this
"Agreement"), between First Banks, Inc., a Missouri corporation (the "Company"),
and First Bank Statutory  Trust VI, a statutory  trust created under the laws of
the State of Delaware (the "Trust"),  relating to the Junior  Subordinated  Debt
Securities  due July 7, 2036 (the "Junior  Subordinated  Debentures"),  issuable
pursuant to an Indenture,  dated as of June 16, 2006 (the "Indenture"),  between
the Company and Wells Fargo Bank, National Association, as Trustee.  Capitalized
terms used herein and not otherwise defined herein have the respective  meanings
ascribed thereto in the Purchase Agreement (as defined below).

         WHEREAS,  the Company,  the Trust and the Purchaser  named therein have
entered  into  a  Purchase  Agreement,   dated  June  14,  2006  (the  "Purchase
Agreement"),  in  connection  with the issuance  and sale of Capital  Securities
(liquidation  amount of $1,000 per security) (the "Capital  Securities")  by the
Trust; and

         WHEREAS,  the  Company  and  the  Trust  have  entered  into  a  Common
Securities Subscription  Agreement,  dated June 16, 2006 (the "Common Securities
Subscription  Agreement"),  in  connection  with the issuance and sale of Common
Securities (liquidation amount of $1,000 per security) (the "Common Securities")
by the Trust; and

         WHEREAS,  in  connection  with the  Purchase  Agreement  and the Common
Securities  Subscription  Agreement  and the  issuance  and sale of the  Capital
Securities and Common Securities pursuant thereto, the Trust desires to purchase
from the  Company,  and the  Company  desires to sell to the  Trust,  all of the
Junior Subordinated Debentures.

         NOW,  THEREFORE,  in  consideration  of the foregoing  premises and the
conditions and  agreements  hereinafter  set forth,  the parties hereto agree as
follows:

         1. The Trust  hereby  subscribes  for and offers to  purchase  from the
Company,  and the Company hereby accepts such offer and agrees to issue and sell
to the Trust,  contemporaneous  with the Closing Date, Twenty Five Million Seven
Hundred Seventy Four Thousand Dollars  ($25,774,000)  aggregate principal amount
of Junior Subordinated Debentures,  in consideration of the payment on or before
the date hereof of Twenty Five  Million  Seven  Hundred  Seventy  Four  Thousand
Dollars ($25,774,000) in immediately available funds.

         2. The Company  represents  and warrants  that the Junior  Subordinated
Debentures have been duly authorized and executed by the Company, and, when duly
authenticated and delivered to the Trust in accordance with the terms hereof and
the Indenture,  will constitute the valid and binding obligations of the Company
entitled to the benefits of the  Indenture,  enforceable  against the Company in
accordance with their terms,  except to the extent that enforcement  thereof may
be  limited  by  bankruptcy,  insolvency,  reorganization,  moratorium  or other
similar laws affecting  creditors' rights generally or by general  principles of
equity (regardless of whether considered in a proceeding in equity or at law).

         3. This Agreement  shall be deemed to be a contract made under the laws
of the  State of New  York,  and for all  purposes  shall be  governed  by,  and
construed in accordance  with,  the laws of the State of New York without regard
to conflict of law principles.

         4. This Agreement may be executed in any number of  counterparts,  each
of which  when so  executed  shall be  deemed  to be an  original,  but all such
counterparts shall together constitute but one and the same instrument.



<PAGE>

         IN WITNESS  WHEREOF,  the parties  hereto  have  caused this  Debenture
Subscription Agreement to be duly executed as of the date first written above.

                                First Banks, Inc.


                                By: /S/ Allen H. Blake
                                   ---------------------------------------------
                                Name:   Allen H. Blake
                                     -------------------------------------------
                                Title:  President & Chief Executive Officer
                                      ------------------------------------------


                                First Bank Statutory Trust VI


                                By: /s/ Allen H. Blake
                                   ---------------------------------------------
                                Name:   Allen H. Blake
                                Title:  Administrator


                                By: /s/ Lisa K. Vansickle
                                   ---------------------------------------------
                                Name:   Lisa K. Vansickle
                                Title:  Administrator