EX-10.15



 Exhibit 10.15 
 UNITED STATES DEPARTMENT OF THE TREASURY 
 1500 Pennsylvania Avenue, NW 
 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. 
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 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/ Timothy G. Massad

		 	Name:	 	Timothy G. Massad
		 	Title:	 	Assistant Secretary for Financial Stability


  

					
	COMPANY:
	
	 FIRST NBC BANK HOLDING
 COMPANY

		
	By:	 	 /s/ Ashton J. Ryan, Jr.

		 	Name:	 	Ashton J. Ryan, Jr. 
		 	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: 021000018
	price:	  	Bank: The Bank of New York Mellon
		  	Account Name: [intentionally omitted]
		  	Account Number: [intentionally omitted]