Exhibit 10.51

RENEWAL, EXTENSION AND MODIFICATION AGREEMENT

This Renewal, Extension and Modification Agreement (this “Amendment”) is made and entered into to be effective for all purposes as of June 19, 2009, by and between JPMORGAN CHASE BANK, NA, a national banking association [successor by merger to Bank One, NA (Illinois)] with its main office in Chicago, Illinois and with a banking office located at 420 Throckmorton Street, Suite 400, Fort Worth, Texas 76102 (“Lender”), and PLAINS CAPITAL CORPORATION, a Texas corporation (“Borrower”).

RECITALS :

A. Prior to the date hereof, Lender and Borrower executed that certain Credit Agreement (as amended, the “Agreement”), dated as of October 13, 2006.

B. Under the Agreement, Lender agreed to extend to Borrower a revolving line of credit (the “LOC”) evidenced by that certain Line of Credit Note dated as of October 13, 2006, which has been executed by Borrower and is payable to Lender in the maximum principal amount of $10,000,000.00 (the “Original Revolving Note”).

C. The Original Revolving Note was extended pursuant to that certain Note Modification, dated as of October 13, 2006, and thereafter amended and restated as well as renewed and extended pursuant to that certain Line of Credit Note, dated as of October 14, 2008 (the “First Amended Revolving Note”).

D. The First Amended and Restated Revolving Note matures on October 31, 2009.

F. Borrower has now requested that Lender agree to extend the maturity of the LOC, and Lender is willing to do so provided that, among other things, the Agreement is amended as herein provided.

G. The parties to this Amendment desire to modify and amend the Agreement as hereinafter set forth and to enter into this Amendment.

AGREEMENT :

NOW, THEREFORE, in consideration of the premises and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and subject to all terms, conditions, and covenants herein set forth, Lender and Borrower hereby covenant and agree as follows:

1. Acknowledgment of Outstanding Balance . The parties hereto acknowledge that the outstanding principal balance under the First Amended and Restated Revolving Note as of June 1, 2009, was SEVEN MILLION SIX HUNDRED FIFTY THOUSAND AND NO/100 DOLLARS ($7,650,000.00).

2. Renewal and Extension of Maturity. Notwithstanding anything to the contrary, the LOC is hereby renewed and extended to July 31, 2010.

RENEWAL, EXTENSION AND MODIFICATION AGREEMENT – Page 1

3. Amended and Restated Revolving Note . In furtherance of the extension of the LOC, the First Amended and Restated Revolving Note shall be amended and restated in full by that certain Second Amended and Restated Promissory Note (the “ New Note ”), dated of even date herewith, made by Borrower and payable to the order of Lender in the maximum principal amount of $10,000,000.00.

4. Conditions Precedent . The obligation of Lender to enter into this Amendment is subject to the performance of each of the following conditions precedent:

(a) Revolving Note . Borrower shall have executed and delivered to Lender the New Note, which shall be deemed to be the Revolving Note as defined in the Agreement;

(b) Resolutions of Borrower . Lender shall have received corporate resolutions of the Board of Directors of Borrower, certified by the Secretary of Borrower, which resolut