UNITED STATES DEPARTMENT OF THE TREASURY

Exhibit 10.15

UNITED STATES DEPARTMENT OF THE TREASURY

0000 Xxxxxxxxxxxx Xxxxxx, XX

Washington, D.C. 20220

August 4, 2011

Ladies and Gentlemen:

Reference is made to that certain Letter Agreement incorporating the Securities Purchase Agreement – Standard Terms (the “Securities Purchase Agreement”), dated as of the date set forth on Schedule A hereto, between the United States Department of the Treasury (the “Investor”) and the company set forth on Schedule A hereto (the “Company”). Capitalized terms used but not defined herein shall have the meanings assigned to them in the Securities Purchase Agreement. Pursuant to the Securities Purchase Agreement, at the Closing, the Company issued to the Investor the number of shares of the series of its preferred stock set forth on Schedule A hereto (the “Preferred Shares”) and a warrant to purchase the number of shares of the series of its preferred stock set forth on Schedule A hereto (such shares, the “Warrant Shares”), which was exercised by the Investor at Closing.

In connection with the consummation of the repurchase (the “Repurchase”) by the Company from the Investor, on the date hereof, of the number of Preferred Shares listed on Schedule A hereto (the “Repurchased Preferred Shares”) and the number of Warrant Shares listed on Schedule A hereto (the “Repurchased Warrant Shares”), as permitted by the Emergency Economic Stabilization Act of 2008, as amended by the American Recovery and Reinvestment Act of 2009:

(a) The Company hereby acknowledges receipt from the Investor of the share certificate(s) set forth on Schedule A hereto representing the Preferred Shares;

(b) The Investor hereby acknowledges receipt from the Company of a wire transfer for the account of the Investor in immediately available funds of the aggregate purchase price set forth on Schedule A hereto, representing payment in full for the Repurchased Preferred Shares at a price per share equal to the Liquidation Amount per share, together with any accrued and unpaid dividends to, but excluding, the date hereof;

(c) The Company hereby acknowledges receipt from the Investor of the share certificate(s) set forth on Schedule A hereto representing the Warrant Shares; and

(d) The Investor hereby acknowledges receipt from the Company of a wire transfer for the account of the Investor in immediately available funds of the aggregate purchase price set forth on Schedule A hereto, representing payment in full for the Repurchased Warrant Shares at a price per share equal to the Liquidation Amount per share, together with any accrued and unpaid dividends to, but excluding, the date hereof.

This letter agreement will be governed by and construed in accordance with the federal law of the United States if and to the extent such law is applicable, and otherwise in accordance with the laws of the State of New York applicable to contracts made and to be performed entirely within such State.

This letter agreement may be executed in any number of separate counterparts, each such counterpart being deemed to be an original instrument, and all such counterparts will together constitute the same agreement. Executed signature pages to this letter agreement may be delivered by facsimile and such facsimiles will be deemed sufficient as if actual signature pages had been delivered.

[Remainder of this page intentionally left blank]

-2-

In witness whereof, the parties have duly executed this letter agreement as of the date first written above.

UNITED STATES DEPARTMENT OF THE TREASURY
By:		/s/ Xxxxxxx X. Xxxxxx
		Name:		Xxxxxxx X. Xxxxxx
		Title:		Assistant Secretary for Financial Stability

COMPANY:
FIRST NBC BANK HOLDING COMPANY
By:		/s/ Xxxxxx X. Xxxx, Xx.
		Name:		Xxxxxx X. Xxxx, Xx.
		Title:		President

		SCHEDULE A
General Information:
Date of Letter Agreement incorporating the Securities		March 20, 2009
Purchase Agreement:
Name of the Company:		First NBC Bank Holding Company
Corporate or other organizational form of the Company:		Corporation
Jurisdiction of organization of the Company:		Louisiana
Number and series of preferred stock issued to the Investor at the Closing (Preferred Shares):		17,836 shares of Fixed Rate Cumulative Perpetual Preferred Stock, Series A
Number and series of preferred stock underlying the Warrant issued to the Investor at the Closing (Warrant Shares):		892 shares of Fixed Rate Cumulative Perpetual Preferred Stock, Series B
Terms of the Repurchase of the Preferred Shares:
Number of Preferred Shares purchased by the Company:		17,836
Share certificate number (representing the Preferred Shares previously issued to the Investor at the Closing):		A-01
Per share Liquidation Amount of Preferred Shares:		$1,000
Accrued and unpaid dividends on Preferred Shares:		$195,700.56
Aggregate purchase price for Repurchased Preferred Shares:		$18,031,700.56
Terms of the Repurchase of the Warrant Shares:
Number of Warrant Shares purchased by the Company:		892
Share certificate (representing the Warrant Shares previously issued to the Investor at the Closing):		B-01
Per share Liquidation Amount of Warrant Shares:		$1,000
Accrued and unpaid dividends on Warrant Shares:		$17,617.00
Aggregate purchase price for Repurchased Warrant Shares:		$909,617.00
Aggregate purchase price for Repurchased Preferred Shares and Repurchased Warrant Shares:		$18,941,317.56

Investor wire information for payment of purchase		ABA Number: 000000000
price:		Bank: The Bank of New York Mellon
		Account Name: [intentionally omitted]
		Account Number: [intentionally omitted]