UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2010

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM              TO             

COMMISSION FILE NUMBER: 000-25051

PROSPERITY BANCSHARES, INC.^®

(Exact name of registrant as specified in its charter)

TEXAS	74-2331986
(State or other jurisdiction	(I.R.S. Employer
of incorporation or organization)	Identification No.)

Prosperity Bank Plaza

4295 San Felipe

Houston, Texas 77027

(Address of principal executive offices, including zip code)

(281) 269-7199

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of “accelerated filer”, “large accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act:

Large Accelerated Filer	x	Accelerated Filer	¨
Non-accelerated Filer	¨  (Do not check if a smaller reporting company)	Smaller Reporting Company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

As of August 1, 2010, there were 46,627,714 outstanding shares of the registrant’s Common Stock, par value $1.00 per share.

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

INDEX TO FORM 10-Q

		Page
PART I—FINANCIAL INFORMATION
Item 1.	Interim Consolidated Financial Statements	3
	Condensed Consolidated Balance Sheets as of June 30, 2010 (unaudited) and December 31, 2009 (unaudited)	3
	Condensed Consolidated Statements of Income for the Three and Six Months Ended June 30, 2010 and 2009 (unaudited)	4
	Condensed Consolidated Statements of Changes in Shareholders’ Equity for the Year Ended December 31, 2009 (unaudited) and for the Six Months Ended June 30, 2010 (unaudited)	5
	Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2010 and 2009 (unaudited)	6
	Notes to Interim Condensed Consolidated Financial Statements (unaudited)	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	17
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	34
Item 4.	Controls and Procedures	34
PART II—OTHER INFORMATION
Item 1.	Legal Proceedings	35
Item 1A.	Risk Factors	35
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	35
Item 3.	Defaults upon Senior Securities	35
Item 4.	Reserved	35
Item 5.	Other Information	35
Item 6.	Exhibits	35
Signatures		36

2

PART I—FINANCIAL INFORMATION

ITEM 1. INTERIM CONSOLIDATED FINANCIAL STATEMENTS

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

	June 30, 2010			December 31, 2009
	(Dollars in thousands, except share data)
ASSETS
Cash and due from banks	$	148,395		$	194,963
Federal funds sold		823			354
Total cash and cash equivalents		149,218			195,317
Available for sale securities, at fair value (amortized cost of $482,277 and $573,648, respectively)		510,305			599,503
Held to maturity securities, at cost (fair value of $4,470,207 and $3,633,753, respectively)		4,307,542			3,518,787
Loans held for investment		3,425,040			3,376,703
Less allowance for credit losses		(52,727	)		(51,863	)
Loans, net		3,372,313			3,324,840
Accrued interest receivable		31,708			30,571
Goodwill		921,484			876,987
Core deposit intangibles, net of accumulated amortization of $45,933 and $41,362, respectively		33,389			35,385
Bank premises and equipment, net		161,267			148,855
Other real estate owned		12,520			7,829
Bank Owned Life Insurance (BOLI)		48,451			48,091
Federal Home Loan Bank of Dallas stock		14,888			16,019
Other assets		45,737			48,216
TOTAL ASSETS	$	9,608,822		$	8,850,400
LIABILITIES AND SHAREHOLDERS’ EQUITY
LIABILITIES:
Deposits:
Noninterest-bearing	$	1,576,727		$	1,492,612
Interest-bearing		6,237,202			5,765,938
Total deposits		7,813,929			7,258,550
Other borrowings		154,935			26,140
Securities sold under repurchase agreements		93,060			72,596
Accrued interest payable		6,530			7,343
Other liabilities		43,969			42,261
Junior subordinated debentures		92,265			92,265
Total liabilities		8,204,688			7,499,155
COMMITMENTS AND CONTINGENCIES		—			—
SHAREHOLDERS’ EQUITY:
Preferred stock, $1 par value; 20,000,000 shares authorized; none issued or outstanding		—			—
Common stock, $1 par value; 200,000,000 shares authorized; 46,658,973 and 46,577,968 shares issued at June 30, 2010 and December 31, 2009, respectively; 46,621,885 and 46,540,880 shares outstanding at June 30, 2010 and December 31, 2009, respectively		46,659			46,578
Capital surplus		873,555			870,460
Retained earnings		466,309			418,008
Accumulated other comprehensive income—unrealized gain on available for sale securities, net of tax of $9,810 and $9,049, respectively		18,218			16,806
Treasury stock, at cost, 37,088 shares		(607	)		(607	)
Total shareholders’ equity		1,404,134			1,351,245
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	9,608,822		$	8,850,400

See notes to interim condensed consolidated financial statements.

3

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Three Months Ended June 30,				Six Months Ended June 30,
	2010		2009		2010		2009
	(In thousands, except per share data)
INTEREST INCOME:
Loans, including fees	$	52,681	$	55,248	$	104,134	$	111,050
Securities		46,603		47,450		91,617		97,178
Federal funds sold and other earning assets		74		70		103		106
Total interest income		99,358		102,768		195,854		208,334
INTEREST EXPENSE:
Deposits		17,573		25,621		35,058		55,078
Junior subordinated debentures		799		959		1,590		2,078
Securities sold under repurchase agreements		175		280		323		628
Note payable and federal funds sold		211		387		511		951
Total interest expense		18,758		27,247		37,482		58,735
NET INTEREST INCOME		80,600		75,521		158,372		149,599
PROVISION FOR CREDIT LOSSES		3,275		6,900		7,685		13,025
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES		77,325		68,621		150,687		136,574
NONINTEREST INCOME:
Customer service fees		12,680		12,863		24,269		25,235
Other		616		2,270		2,005		4,915
Total noninterest income		13,296		15,133		26,274		30,150
NONINTEREST EXPENSE:
Salaries and employee benefits		22,431		20,494		43,543		43,142
Net occupancy expense		3,708		3,514		7,142		7,492
Depreciation expense		2,147		2,069		4,153		4,070
Data processing		1,742		1,562		3,157		3,617
Core deposit intangible amortization		2,280		2,492		4,570		5,156
Other		10,741		14,169		20,209		24,846
Total noninterest expense		43,049		44,300		82,774		88,323
INCOME BEFORE INCOME TAXES		47,572		39,454		94,187		78,401
PROVISION FOR INCOME TAXES		15,826		12,944		31,443		26,413
NET INCOME	$	31,746	$	26,510	$	62,744	$	51,988
EARNINGS PER SHARE
Basic	$	0.68	$	0.57	$	1.35	$	1.13
Diluted	$	0.68	$	0.57	$	1.34	$	1.13

See notes to interim condensed consolidated financial statements.

4

PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

(UNAUDITED)

	Common Stock			Capital Surplus		Retained Earnings			Accumulated Other Comprehensive Income		Treasury Stock			Total Shareholders’ Equity
	Shares	Amount
	(Amounts in thousands, except share and per share data)
BALANCE AT JANUARY 1, 2009	46,116,801	$	46,117	$	867,380	$	332,363		$	9,853	$	(607	)	$	1,255,106
Comprehensive Income:
Net income							111,879								111,879
Net change in unrealized gain on available for sale securities (net of tax of $3,744)										6,953					6,953
Total comprehensive income															118,832
Common stock issued in connection with the exercise of stock options and restricted stock awards	461,167		461		1,565										2,026
Stock based compensation expense					1,515										1,515
Cash dividends declared, $0.568 per share							(26,234	)							(26,234	)
BALANCE AT DECEMBER 31, 2009	46,577,968		46,578		870,460		418,008			16,806		(607	)		1,351,245
Comprehensive income:
Net income							62,744								62,744
Net change in unrealized gain on available for sale securities (net of tax of $761)										1,412					1,412
Total comprehensive income															64,156
Common stock issued in connection with the exercise of stock options and restricted stock awards	81,005		81		1,612										1,693
Stock based compensation expense					1,483										1,483
Cash dividends declared, $0.31 per share							(14,443	)							(14,443	)
BALANCE AT JUNE 30, 2010	46,658,973	$	46,659	$	873,555	$	466,309		$	18,218	$	(607	)	$	1,404,134

See notes to interim condensed consolidated financial statements.

5

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Six Months Ended June 30,
	2010			2009
	(In thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	62,744		$	51,988
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		8,723			9,226
Stock based compensation expense		1,483			620
Net amortization of premium on loans and deposits		(473	)		(4,003	)
Provision for credit losses		7,685			13,025
Net amortization of discount on investments		6,715			(1,795	)
Net loss (gain) on sale of other real estate		1,983			(437	)
Net gain on sale of premises and equipment		(399	)		(297	)
Net decrease in accrued interest receivable and other assets		2,667			10,700
Net decrease in accrued interest payable and other liabilities		(273	)		(30,423	)
Net cash provided by operating activities		90,855			48,604
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of securities held to maturity		523,461			425,083
Purchase of securities held to maturity		(1,319,657	)		(403,001	)
Proceeds from maturities, sales and principal paydowns of securities available for sale		1,092,095			713,996
Purchase of securities available for sale		(999,998	)		(549,999	)
Net decrease in interest-bearing deposits in financial institutions		—			106
Net decrease in loans held for investment		52,686			91,152
Purchase of bank premises and equipment		(11,510	)		(31,110	)
Net proceeds from sale of bank premises, equipment and other real estate		21,152			12,859
Purchase of 1st Choice Bancorp		—			(17	)
Purchase of Banco Popular branches		—			(50	)
Cash and cash equivalents acquired in the purchase of U.S. Bank branches		344,722			—
Premium paid for U.S. Bank branches		(13,136	)		—
Cash and cash equivalents acquired in the purchase of First Bank branches		379,771			—
Premium paid for First Bank branches		(26,876	)		—
Acquisition of Franklin Bank branches		—			(405	)
Net cash provided by (used in) investing activities		42,710			258,614

Continued

6

PROSPERITY BANCSHARES, INC.^® AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Six Months Ended June 30,
	2010			2009
	(In thousands)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in noninterest-bearing deposits		(44,397	)		(49,421	)
Net decrease in interest-bearing deposits		(267,969	)		(2,392	)
Net repayments of long-term debt		(11,205	)		(1,225	)
Net proceeds from (repayments of) short-term debt		140,000			(200,000	)
Net increase in securities sold under repurchase agreements		16,657			715
Proceeds from exercise of stock options		1,693			460
Payments of cash dividends		(14,443	)		(12,677	)
Net cash used in financing activities		(179,664	)		(264,540	)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	$	(46,099	)	$	42,678
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		195,317			228,633
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	149,218		$	271,311
SUPPLEMENTAL DISCLOSURES:
Cash paid for interest	$	38,295		$	62,666
Cash paid for income taxes		34,550			28,500

See notes to interim condensed consolidated financial statements.

7

PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2010

(UNAUDITED)

1. BASIS OF PRESENTATION

The interim condensed consolidated financial statements include the accounts of Prosperity Bancshares, Inc.^® (the “Company”) and its wholly-owned subsidiaries, Prosperity Bank^® (the “Bank”) and Prosperity Holdings of Delaware, LLC. All significant inter-company transactions and balances have been eliminated.

The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, the statements reflect all adjustments necessary for a fair presentation of the financial position, results of operations and cash flows of the Company on a consolidated basis, and all such adjustments are of a normal recurring nature. These financial statements and the notes thereto should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2009. Operating results for the six-month period ended June 30, 2010 are not necessarily indicative of the results that may be expected for the year ending December 31, 2010 or any other period.

2. INCOME PER COMMON SHARE

The following table illustrates the computation of basic and diluted earnings per share:

	Three Months Ended June 30,				Six Months Ended June 30,
	2010		2009		2010		2009
	(In thousands, except per share amounts)
Net income available to common shareholders	$	31,746	$	26,510	$	62,744	$	51,988
Weighted average common shares outstanding		46,610		46,105		46,581		46,097
Potential dilutive common shares		244		120		276		49
Weighted average common shares and equivalents outstanding		46,854		46,225		46,857		46,146
Basic earnings per common share	$	0.68	$	0.57	$	1.35	$	1.13
Diluted earnings per common share	$	0.68	$	0.57	$	1.34	$	1.13

The incremental shares for the assumed exercise of the outstanding options were determined by application of the treasury stock method. There were no stock options outstanding during the quarter ended June 30, 2010 or 2009 that would have had an anti-dilutive effect on the above computation.

3. NEW ACCOUNTING STANDARDS

Accounting Standards Updates

Accounting Standards Update (ASU) No. 2009-16, “Transfers and Servicing (Topic 860)—Accounting for Transfers of Financial Assets.” ASU 2009-16 amends prior accounting guidance to enhance reporting about transfers of financial assets, including securitizations, and where companies have continuing exposure to the risks related to transferred financial assets. ASU 2009-16 eliminates the concept of a “qualifying special-purpose entity” and changes the requirements for derecognizing financial assets. ASU 2009-16 also requires additional disclosures about all continuing involvements with transferred financial assets including information about gains and losses resulting from transfers during the period. The provisions of ASU 2009-16 became effective on January 1, 2010 and did not have a significant impact on the Company’s financial statements.

8

PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

JUNE 30, 2010

(UNAUDITED)

ASU No. 2009-17, “Consolidations (Topic 810)—Improvements to Financial Reporting by Enterprises Involved with Variable Interest Entities.” ASU 2009-17 amends prior guidance to change how a company determines when an entity that is insufficiently capitalized or is not controlled through voting (or similar rights) should be consolidated. The determination of whether a company is required to consolidate an entity is based on, among other things, an entity’s purpose and design and a company’s ability to direct the activities of the entity that most significantly impact the entity’s economic performance. ASU 2009-17 requires additional disclosures about the reporting entity’s involvement with variable-interest entities and any significant changes in risk exposure due to that involvement as well as its effect on the entity’s financial statements. ASU No. 2010-10, “Consolidations (Topic 810),” deferred the effective date of ASU 2009-17 for a reporting entity’s interests in investment companies. The provisions of ASU 2009-17 became effective on January 1, 2010 and did not have a significant impact on the Company’s financial statements.

ASU No. 2010-06, “Fair Value Measurements and Disclosures (Topic 820)—Improving Disclosures About Fair Value Measurements.” ASU 2010-06 requires expanded disclosures related to fair value measurements including (i) the amounts of significant transfers of assets or liabilities between Levels 1 and 2 of the fair value hierarchy and the reasons for the transfers, (ii) the reasons for transfers of assets or liabilities in or out of Level 3 of the fair value hierarchy, with significant transfers disclosed separately, (iii) the policy for determining when transfers between levels of the fair value hierarchy are recognized and (iv) for recurring fair value measurements of assets and liabilities in Level 3 of the fair value hierarchy, a gross presentation of information about purchases, sales, issuances and settlements. ASU 2010-06 further clarifies that (i) fair value measurement disclosures should be provided for each class of assets and liabilities (rather than major category), which would generally be a subset of assets or liabilities within a line item in the statement of financial position and (ii) a company should provide disclosures about the valuation techniques and inputs used to measure fair value for both recurring and nonrecurring fair value measurements for each class of assets and liabilities included in Levels 2 and 3 of the fair value hierarchy. The disclosures related to the gross presentation of purchases, sales, issuances and settlements of assets and liabilities included in Level 3 of the fair value hierarchy will be required for the Company beginning January 1, 2011. The remaining disclosure requirements and clarifications made by ASU 2010-06 became effective for the Company on January 1, 2010 (see Note 4 —Fair Value), and did not have a significant impact on the Company’s financial statements.

ASU No. 2010-20, “Receivables (Topic 830)—Disclosures about the Credit Quality of Financing Receivables and the Allowance for Credit Losses.” ASU 2010-20 requires entities to provide disclosures designed to facilitate financial statement users’ evaluation of (i) the nature of credit risk inherent in the entity’s portfolio of financing receivables, (ii) how that risk is analyzed and assessed in arriving at the allowance for credit losses and (iii) the changes and reasons for those changes in the allowance for credit losses. Disclosures must be disaggregated by portfolio segment, the level at which an entity develops and documents a systematic method for determining its allowance for credit losses, and class of financing receivable, which is generally a disaggregation of portfolio segment. The required disclosures include, among other things, a rollforward of the allowance for credit losses as well as information about modified, impaired, non-accrual and past due loans and credit quality indicators. ASU 2010-20 will be effective for the Company’s financial statements as of December 31, 2010, as it relates to disclosures required as of the end of a reporting period. Disclosures that relate to activity during a reporting period will be required for the Company’s financial statements that include periods beginning on or after January 1, 2011.

4. FAIR VALUE

Effective January 1, 2008, the Company adopted FASB ASC Topic 820, Fair Value Measurement and Disclosures. ASC Topic 820, which defines fair value, addresses aspects of the expanding application of fair value accounting and establishes a consistent framework for measuring fair value. Fair value represents the estimated price that would be received from selling an asset or paid to transfer a liability, otherwise known as an “exit price”.

9

PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

JUNE 30, 2010

(UNAUDITED)

Fair Value Hierarchy

ASC Topic 820 specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. In accordance with ASC Topic 820, these inputs are summarized in the three broad levels listed below:

• Level 1—Quoted prices in active markets for identical assets or liabilities. Level 1 assets include U.S. Treasury securities that are highly liquid and are actively traded in over-the-counter markets.

• Level 2—Other significant observable inputs (including quoted prices in active markets for similar assets or liabilities) or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company’s Level 2 assets include U.S. government and agency mortgage-backed debt securities, corporate securities, municipal bonds and CRA funds.

• Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair values requires significant management judgment or estimation.

In determining the appropriate levels, the Company performs a detailed analysis of the assets and liabilities that are subject to ASC Topic 820.

The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of June 30, 2010, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:

	Level 1		Level 2		Level 3		Total
	(Dollars in thousands)
Available for sale securities (at fair value):
U.S Treasury securities and obligations of U.S. government agencies	$	—	$	1,019	$	—	$	1,019
States and political subdivisions (including QZAB)		—		56,784		—		56,784
Corporate debt securities and other		—		8,975		—		8,975
Collateralized mortgage obligations		—		1,052		—		1,052
Mortgage-backed securities		—		442,475		—		442,475
TOTAL	$	—	$	510,305	$	—	$	510,305

Certain assets and liabilities are measured at fair value on a non-recurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These instruments include other real estate owned, repossessed assets and impaired loans per ASC Topic 310, Receivables. For the six months ended June 30, 2010, the Company had additions to impaired loans of $15.9 million and additions to other real estate owned of $19.9 million, of which $4.4 million and $9.3 million were outstanding June 30, 2010, respectively. The remaining financial assets and financial liabilities measured at fair value on a non-recurring basis that were recorded in 2010 and remained outstanding at June 30, 2010 were not significant.

10

PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

JUNE 30, 2010

(UNAUDITED)

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. FASB ASC Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs

These fair value disclosures represent the Company’s estimates based on relevant market information and information about the financial instruments. Fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of the various instruments and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in the above methodologies and assumptions could significantly affect the estimates.

The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:

Cash and Cash Equivalents—For these short-term instruments, the carrying amount is a reasonable estimate of fair value.

Federal Funds Sold—The carrying amount is a reasonable estimate of fair value.

Securities—For securities held as investments, fair value equals quoted market price, if available. If a quoted market price is not available, fair value is estimated using quoted market prices for similar securities.

Loans Held for Investment—For fixed rate loans and certain homogeneous categories of loans (such as some residential mortgages and other consumer loans), fair value is estimated by discounting the future cash flows using the risk-free Treasury rate for the applicable maturity, adjusted for servicing and credit risk. The carrying value of variable rate loans approximates fair value because the loans reprice frequently to current market rates.

Deposits—The fair value of demand deposits, savings accounts and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed-maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities.

Junior Subordinated Debentures—The fair value of the junior subordinated debentures was calculated using the quoted market prices, if available. If quoted market prices are not available, fair value is estimated using quoted market prices for similar subordinated debentures.

Other Borrowings—Rates currently available to the Company for debt with similar terms and remaining maturities are used to estimate the fair value of existing debt using a discounted cash flows methodology.

Securities Sold Under Repurchase Agreements—The fair value of securities sold under repurchase agreements is the amount payable on demand at the reporting date.

Off-Balance Sheet Financial Instruments—The fair value of commitments to extend credit and standby letters of credit is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreement and the present creditworthiness of the counterparties.

11

PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

JUNE 30, 2010

(UNAUDITED)

FASB ASC Topic 825, Financial Instruments, requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The carrying amount and estimated fair values of the Company’s financial instruments are as follows:

	June 30, 2010
	Carrying Amount		Estimated Fair Value
	(Dollars in thousands)
Financial assets:
Cash and due from banks	$	148,395	$	148,395
Federal funds sold		823		823
Available for sale securities		510,305		510,305
Held to maturity securities		4,307,542		4,470,206
Loans held for investment and for sale (net of allowance for credit losses)		3,372,313		3,370,563
Total	$	8,339,378	$	8,500,292
Financial liabilities:
Deposits	$	7,813,929	$	7,833,179
Other borrowings		154,935		156,463
Securities sold under repurchase agreements		93,060		93,060
Junior subordinated debentures		92,265		90,352
Total	$	8,154,189	$	8,173,054

The Company’s off-balance sheet commitments, which total $477.3 million at June 30, 2010, are funded at current market rates at the date they are drawn upon. It is management’s opinion that the fair value of these commitments would approximate their carrying value, if drawn upon.

The fair value estimates presented herein are based on pertinent information available to management at June 30, 2010. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein.

5. GOODWILL AND CORE DEPOSIT INTANGIBLES

Changes in the carrying amount of the Company’s goodwill and core deposit intangibles (CDI) for the six months ended June 30, 2010 were as follows:

	Goodwill		Core Deposit Intangibles
	(Dollars in thousands)
Balance as of December 31, 2009	$	876,987	$	35,385
Amortization		—		(4,570	)
Acquisition of First Bank branches		31,899		2,036
Acquisition of U.S. Bank branches		12,598		538
Balance as of June 30, 2010	$	921,484	$	33,389

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PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

JUNE 30, 2010

(UNAUDITED)

Purchase accounting adjustments to prior year acquisitions were made to adjust deferred tax asset and liability balances. Goodwill is recorded on the acquisition date of each entity. The Company may record subsequent adjustments to goodwill for amounts undeterminable at acquisition date, such as deferred taxes and real estate valuations, and therefore the goodwill amounts reflected in the table above may change accordingly. The Company initially records the total premium paid on acquisitions as goodwill. After finalizing the valuation, core deposit intangibles are identified and reclassified from goodwill to core deposit intangibles on the balance sheet. This reclassification has no effect on total assets or liabilities. Management performs an evaluation annually, and more frequently if a triggering event occurs, of whether any impairment of the goodwill and other intangibles has occurred. If any such impairment is determined, a write down is recorded. As of June 30, 2010, there were no impairments recorded on goodwill or other intangibles.

Although the Bank completed the U.S. Bank branch acquisition in March 2010 and the First Bank branch acquisition in May 2010, the Company has not yet finalized the allocation of the purchase price for each respective acquisition.

Core deposit intangibles are amortized on an accelerated basis over their estimated lives, which the Company believes is between 8 and 10 years. Gross core deposit intangibles outstanding were $79.3 million and $76.7 million at June 30, 2010 and December 31, 2009, respectively. Net core deposit intangibles outstanding were $33.4 million and $35.4 million at the same dates, respectively. Amortization expense related to intangible assets totaled $2.3 million and $2.5 million for the three months ended June 30, 2010 and 2009, respectively, and $4.6 million and $5.2 million for the six months ended June 30, 2010 and 2009, respectively. The estimated aggregate future amortization expense for intangible assets remaining as of June 30, 2010 is as follows (dollars in thousands):

Remaining 2010	$	4,467
2011		7,806
2012		6,370
2013		4,485
2014		3,331
Thereafter		6,930
Total	$	33,389

6. STOCK BASED COMPENSATION

At June 30, 2010, the Company had three stock-based employee compensation plans and four stock option plans assumed in connection with acquisitions under which no additional options will be granted. Two of the three plans adopted by the Company have expired and therefore no additional awards may be issued under those plans. The Company accounts for stock-based employee compensation plans using the fair value-based method of accounting in accordance with ASC Topic 718. ASC Topic 718 was effective for companies in 2006; however, the Company has been recognizing compensation expense since January 1, 2003. The Company recognized $1.5 million and $620,000 in stock-based compensation expense for the six months ended June 30, 2010 and 2009, respectively, and $692,000 and $294,000 in stock-based compensation expense for the three months ended June 30, 2010 and 2009, respectively. There was approximately $469,000 and $146,000 of income tax benefit recorded for the stock-based compensation expense for the six months ended June 30, 2010 and 2009, respectively, and $217,000 and $66,000 of income tax benefit recorded for the stock-based compensation expense for the three months ended June 30, 2010 and 2009, respectively.

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PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

JUNE 30, 2010

(UNAUDITED)

The Company has granted shares of common stock (“restricted stock”) to certain directors and associates under the Company’s 2004 Stock Incentive Plan. The awardee is not entitled to the shares until they vest, which is generally over a 1 to 5 year period, but the awardee is entitled to receive dividends on and vote the shares prior to vesting. The shares granted do not have a cost to the awardee and the only requirement of vesting is continued service to the Company. Compensation cost related to restricted stock is calculated based on the market price of the shares at the date of grant. If the awardee leaves the Company before the shares vest, the unvested shares are forfeited. As of June 30, 2010, there were 356,905 shares of restricted stock outstanding with a weighted average grant date fair value of $36.50.

Stock options are issued at the current market price on the date of the grant, subject to a pre-determined vesting period with a contractual term of 10 years. Options assumed in connection with acquisitions have contractual terms as established in the original option grant agreements entered into prior to acquisition. The fair value of stock options granted is estimated at the date of grant using the Black-Scholes option-pricing model. Stock-based compensation expense is recognized ratably over the requisite service period for all awards.

The fair value of options was estimated using an option-pricing model with the following weighted average assumptions:

	June 30,
	2010		2009
Expected life (years)	5.14		5.10
Risk free interest rate	3.88	%	4.11	%
Volatility	21.21	%	21.19	%
Dividend yield	1.26	%	1.22	%

A summary of changes in outstanding vested and unvested options during the six months ended June 30, 2010 is set forth below:

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate  Intrinsic Value
	(In thousands)					(In thousands)
Options outstanding, beginning of period	856		$	25.88
Options granted	—			—
Options forfeited	(15	)		26.91
Options exercised	(77	)		21.96
Options outstanding, end of period	764		$	26.25	4.66	$	6,489
Options vested or expected to vest	740		$	25.97	4.59	$	6,498
Options exercisable, end of period	424		$	23.87	3.67	$	4,612

No options were granted during the six months ended June 30, 2010 and a total of 12,500 options at a weighted average exercise price of $29.08 were granted during the six months ended June 30, 2009. The total intrinsic value of the options exercised during the six month periods ended June 30, 2010 and 2009 was $986,000 and $355,000, respectively. The total fair value of shares vested during the six month periods ended June 30, 2010 and 2009 was $124,000 and $113,000, respectively.

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PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

JUNE 30, 2010

(UNAUDITED)

A summary of changes in non-vested options is set forth below:

	Six Months Ended June 30,
	2010				2009
	Number of Options		Weighted Average Grant Date Fair Value		Number of Options		Weighted Average Grant Date Fair Value
	(In thousands)				(In thousands)
Non-vested options outstanding, beginning of period	376		$	6.78	529		$	6.83
Options granted	—			—	13			4.58
Non-vested options forfeited	(15	)		6.94	(2	)		4.34
Options vested	(21	)		5.78	(21	)		5.47
Non-vested options outstanding, end of period	340		$	6.84	519		$	6.83

The Company received $1.7 million and $460,000 in cash from the exercise of stock options during the six month periods ended June 30, 2010 and 2009, respectively. There was no tax benefit realized from option exercises of the stock-based compensation arrangements during the six month periods ended June 30, 2010 and 2009.

As of June 30, 2010, there was $11.9 million of total unrecognized compensation expense related to non-vested stock-based compensation arrangements. That cost is expected to be recognized over a weighted average period of 3.1 years.

7. CONTRACTUAL OBLIGATIONS AND OFF-BALANCE SHEET ITEMS

Contractual Obligations

The following table summarizes the Company’s contractual obligations and other commitments to make future payments as of June 30, 2010 (other than deposit obligations). The payments do not include pre-payment options that may be available to the Company. The Company’s future cash payments associated with its contractual obligations pursuant to its junior subordinated debentures, FHLB notes payable and operating leases as of June 30, 2010 are summarized below. Payments for junior subordinated debentures include interest of $72.6 million that will be paid over the future periods. The future interest payments were calculated using the current rate in effect at June 30, 2010. With respect to floating interest rates, the payments were determined based on the 3-month LIBOR in effect at June 30, 2010. The current principal balance of the junior subordinated debentures at June 30, 2010 was $92.3 million. Payments for FHLB notes payable include interest of $4.6 million that will be paid over the future periods. Payments related to leases are based on actual payments specified in underlying contracts.

	Payments due in:
	Remaining Fiscal 2010		Fiscal 2011-2012		Fiscal 2013-2014		Thereafter		Total
	(Dollars in thousands)
Junior subordinated debentures	$	1,606	$	6,425	$	6,425	$	150,434	$	164,890
Federal Home Loan Bank notes payable		738		4,062		3,258		11,458		19,516
Operating leases		2,156		6,836		4,190		869		14,051
Total	$	4,500	$	17,323	$	13,873	$	162,761	$	198,457

15

PROSPERITY BANCSHARES, INC. ^® AND SUBSIDIARIES

NOTES TO INTERIM CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

JUNE 30, 2010

(UNAUDITED)

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions, which, in accordance with accounting principles generally accepted in the United States, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets.

The Company’s commitments associated with outstanding standby letters of credit and commitments to extend credit as of June 30, 2010 are summarized below. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements:

	Remaining Fiscal 2010		Fiscal 2011-2012		Fiscal 2013-2014		Thereafter		Total
	(Dollars in thousands)
Standby letters of credit	$	10,087	$	4,785	$	196	$	—	$	15,068
Commitments to extend credit		138,432		175,750		1,725		146,359		462,266
Total	$	148,519	$	180,535	$	1,921	$	146,359	$	477,334

8. SUBSEQUENT EVENTS

The Company evaluated all events and transactions that occurred after the balance sheet date and determined no reportable subsequent events existed.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Special Cautionary Notice Regarding Forward-Looking Statements

Statements and financial discussion and analysis contained in this quarterly report on Form 10-Q that are not historical facts are forward-looking statements made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are based on assumptions and involve a number of risks and uncertainties, many of which are beyond the Company’s control. Many possible events or factors could affect the future financial results and performance of the Company and could cause such results or performance to differ materially from those expressed in the forward-looking statements. These possible events or factors include, without limitation:

• changes in the strength of the United States economy in general and the strength of the local economies in which the Company conducts operations resulting in, among other things, a deterioration in credit quality or reduced demand for credit, including the result and effect on the Company’s loan portfolio and allowance for credit losses;

• changes in interest rates and market prices, which could reduce the Company’s net interest margins, asset valuations and expense expectations;

• changes in the levels of loan prepayments and the resulting effects on the value of the Company’s loan portfolio;

• changes in local economic and business conditions which adversely affect the Company’s customers and their ability to transact profitable business with the company, including the ability of the Company’s borrowers to repay their loans according to their terms or a change in the value of the related collateral;

• increased competition for deposits and loans adversely affecting rates and terms;

• the timing, impact and other uncertainties of any future acquisitions, including the Company’s ability to identify suitable future acquisition candidates, the success or failure in the integration of their operations, and the ability to enter new markets successfully and capitalize on growth opportunities;

• the possible impairment of goodwill associated with an acquisition and possible adverse short-term effects on the results of operations;

• increased credit risk in the Company’s assets and increased operating risk caused by a material change in commercial, consumer and/or real estate loans as a percentage of the total loan portfolio;

• the concentration of the Company’s loan portfolio in loans collateralized by real estate;

• the failure of assumptions underlying the establishment of and provisions made to the allowance for credit losses;

• changes in the availability of funds resulting in increased costs or reduced liquidity;

• a deterioration or downgrade in the credit quality and credit agency ratings of the securities in the Company’s securities portfolio;

• increased asset levels and changes in the composition of assets and the resulting impact on the Company’s capital levels and regulatory capital ratios;

• the Company’s ability to acquire, operate and maintain cost effective and efficient systems without incurring unexpectedly difficult or expensive but necessary technological changes;

• the loss of senior management or operating personnel and the potential inability to hire qualified personnel at reasonable compensation levels;

• government intervention in the U.S. financial system;

• changes in statutes and government regulations or their interpretations applicable to financial holding companies and the Company’s present and future banking and other subsidiaries, including changes in tax requirements and tax rates;

17

• increases in FDIC deposit insurance assessments;

• acts of terrorism, an outbreak of hostilities or other international or domestic calamities, weather or other acts of God and other matters beyond the Company’s control; and

• other risks and uncertainties listed from time to time in the Company’s reports and documents filed with the Securities and Exchange Commission.

A forward-looking statement may include a statement of the assumptions or bases underlying the forward-looking statement. The Company believes it has chosen these assumptions or bases in good faith and that they are reasonable. However, the Company cautions you that assumptions or bases almost always vary from actual results, and the differences between assumptions or bases and actual results can be material. The Company undertakes no obligation to publicly update or otherwise revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Management’s Discussion and Analysis of Financial Condition and Results of Operations analyzes the major elements of the Company’s interim consolidated financial statements and accompanying notes. This section should be read in conjunction with the Company’s interim consolidated financial statements and accompanying notes included elsewhere in this report and with the consolidated financial statements and accompanying notes and other detailed information appearing in the Company’s Annual Report on Form 10-K for the year ended December 31, 2009.

PASSAGE OF DODD-FRANK ACT

In July 2010, Congress enacted regulatory reform legislation known as the Dodd–Frank Wall Street Reform and Consumer Protection Act (the “Dodd–Frank Act”), which the President signed into law on July 21, 2010. Many aspects of the Dodd–Frank Act are subject to further rulemaking and will take effect over several years, making it difficult to anticipate the overall financial impact to the Company, the Bank or across the industry. This new law broadly affects the financial services industry by implementing changes to the financial regulatory landscape aimed at strengthening the sound operation of the financial services sector, including provisions that, among other things, will:

• Create a new agency, the Consumer Financial Protection Bureau, responsible for implementing, examining and enforcing compliance with federal consumer financial laws;

• Apply the same leverage and risk–based capital requirements that apply to insured depository institutions to most bank holding companies, which, among other things, will require the Company to deduct all trust preferred securities issued on or after May 19, 2010 from the Company’s Tier 1 capital (existing trust preferred securities issued prior to May 19, 2010 for all bank holding companies with less than $15.0 billion in total consolidated assets as of December 31, 2009 are exempt from this requirement);

• Require the Company to be well–capitalized and well–managed in order to acquire banks located outside its home state;

• Broaden the base for FDIC insurance assessments from the amount of insured deposits to average total consolidated assets less average tangible equity during the assessment period, which generally is expected to result in an increase in the level of assessments;

• Permanently increase FDIC deposit insurance to $250,000 and provide unlimited FDIC deposit insurance beginning December 31, 2010 until January 1, 2013 for noninterest bearing demand transaction accounts at all insured depository institutions;

• Amend the Electronic Fund Transfer Act to, among other things, give the Federal Reserve the authority to establish rules regarding interchange fees charged for electronic debit transactions by payment card issuers having assets over $10 billion and to enforce a new statutory requirement that such fees be reasonable and proportional to the actual cost of a transaction to the issuer;

• Permit the Bank to engage in de novo interstate branching if the laws of the state where the new branch is to be established would permit the establishment of the branch if the Bank were chartered by such state;

18

• Implement corporate governance revisions, including with regard to executive compensation and proxy access by shareholders, that apply to all public companies, not just financial institutions; and

• Repeal the federal prohibitions on the payment of interest on demand deposits, thereby permitting depository institutions to pay interest on business transaction and other accounts.

The Company’s management is actively reviewing the provisions of the Dodd–Frank Act and assessing its probable impact on the business, financial condition, and results of operations of the Company and the Bank. Provisions in the legislation that affect deposit insurance assessments, payment of interest on demand deposits and interchange fees could increase the costs associated with deposits as well as place limitations on certain revenues those deposits may generate. Provisions in the legislation that revoke the Tier 1 capital treatment of newly issued trust preferred securities could require the Company to seek other sources of capital in the future.

OVERVIEW

The Company, a Texas corporation, was formed in 1983 as a vehicle to acquire the former Allied First Bank in Edna, Texas which was chartered in 1949 as The First National Bank of Edna. The Company is a registered financial holding company that derives substantially all of its revenues and income from the operation of its bank subsidiary, Prosperity Bank^® (“Prosperity Bank^®” or the “Bank”). The Bank provides a wide array of financial products and services to small and medium-sized businesses and consumers. As of June 30, 2010, the Bank operated one hundred seventy-five (175) full-service banking locations; with sixty (60) in the Houston area, twenty (20) in the South Texas area including Corpus Christi and Victoria, thirty-three (33) in the Central Texas, ten (10) in the Bryan/College Station area, twenty-one (21) in East Texas and thirty-one (31) in the Dallas/Fort Worth, Texas area. The Company’s headquarters are located at Prosperity Bank Plaza, 4295 San Felipe in Houston, Texas and its telephone number is (281) 269-7199. The Company’s website address is www.prosperitybanktx.com. Information contained on the Company’s website is not incorporated by reference into this quarterly report on Form 10-Q and is not part of this or any other report.

The Company generates the majority of its revenues from interest income on loans, service charges on customer accounts and income from investment in securities. The revenues are partially offset by interest expense paid on deposits and other borrowings and noninterest expenses such as administrative and occupancy expenses. Net interest income is the difference between interest income on earning assets such as loans and securities and interest expense on liabilities such as deposits and borrowings which are used to fund those assets. The level of interest rates and the volume and mix of earning assets and interest-bearing liabilities impact net interest income and margin.

Three principal components of the Company’s growth strategy are internal growth, stringent cost control practices and strategic merger transactions. The Company focuses on continuous internal growth. Each banking center is operated as a separate profit center, maintaining separate data with respect to its net interest income, efficiency ratio, deposit growth, loan growth and overall profitability. Banking center presidents and managers are accountable for performance in these areas and compensated accordingly. The Company also focuses on maintaining stringent cost control practices and policies. The Company has invested significantly in the infrastructure required to centralize many of its critical operations, such as data processing and loan processing. Management believes that this centralized infrastructure can accommodate substantial additional growth while enabling the Company to minimize operational costs through certain economies of scale. The Company also intends to continue to seek expansion opportunities. On March 26, 2010, the Company purchased three (3) retail branches of U.S. Bank. The three banking centers acquired by the Company were the Texas locations U.S. Bank acquired from the FDIC on October 30, 2009 when U.S. Bank acquired the nine (9) subsidiary banks of FBOP Corporation. On April 30, 2010, the Company purchased nineteen (19) Texas retail branches of First Bank, and subsequently consolidated four of these branches into nearby existing Company banking centers.

Total assets were $9.61 billion at June 30, 2010 compared with $8.85 billion at December 31, 2009, an increase of $758.4 million or 8.6%. Total loans were $3.42 billion at June 30, 2010 compared with $3.38 billion at December 31, 2009, an increase of $48.3 million or 1.4%. Total deposits were $7.81 billion at June 30, 2010 compared with $7.26 billion December 31, 2009, an increase of $555.4 million or 7.7%. The increase in total assets, loans and deposits is primarily due to the acquisition of the U.S. Bank and First Bank branches. Shareholders’ equity increased $52.9 million or 3.9%, to $1.40 billion at June 30, 2010 compared with $1.35 billion at December 31, 2009.

19

CRITICAL ACCOUNTING POLICIES

The Company’s accounting policies are integral to understanding the financial results reported. Accounting policies are described in detail in Note 1 to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2009. The Company believes that of its significant accounting policies, the following may involve a higher degree of judgment and complexity:

Allowance for Credit Losses—The allowance for credit losses is established through charges to earnings in the form of a provision for credit losses. Management has established an allowance for credit losses which it believes is adequate for estimated losses in the Company’s loan portfolio. Based on an evaluation of the loan portfolio, management presents a monthly review of the allowance for credit losses to the Bank’s Board of Directors, indicating any change in the allowance since the last review and any recommendations as to adjustments in the allowance. In making its evaluation, management considers factors such as historical loan loss experience, industry diversification of the Company’s commercial loan portfolio, the amount of nonperforming assets and related collateral, the volume, growth and composition of the Company’s loan portfolio, current economic conditions that may affect the borrower’s ability to pay and the value of collateral, the evaluation of the Company’s loan portfolio through its internal loan review process and other relevant factors. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged off. Charge-offs occur when loans are deemed to be uncollectible. The allowance for credit losses includes allowance allocations calculated in accordance with FASB ASC Topic 310, “Receivables,” and allowance allocations determined in accordance with FASB ASC Topic 450, “Contingencies.”

Goodwill and Intangible Assets—Goodwill and intangible assets that have indefinite useful lives are subject to an impairment test at least annually, or more often, if events or circumstances indicate that it is more likely than not that the fair value of Prosperity Bank, the Company’s only reporting unit with assigned goodwill, is below the carrying value of its equity. Goodwill is tested for impairment using a two-step process that begins with an estimation of the fair value of the Company’s reporting unit compared with its carrying value. If the carrying amount exceeds the fair value of the reporting unit, a second test is completed comparing the implied fair value of the reporting unit’s goodwill to its carrying value to measure the amount of impairment. The Company had no intangible assets with indefinite useful lives at June 30, 2010. Other identifiable intangible assets that are subject to amortization are amortized on an accelerated basis over the years expected to be benefited, which the Company believes is between eight and ten years. These amortizable intangible assets are reviewed for impairment if circumstances indicate their value may not be recoverable based on a comparison of fair value to carrying value. Based on the Company’s annual goodwill impairment test as of September 30, 2009, management does not believe any of its goodwill is impaired as of June 30, 2010 because the fair value of the Company’s equity exceeded its carrying value. While the Company believes no impairment existed at June 30, 2010 under accounting standards applicable at that date, different conditions or assumptions, or changes in cash flows or profitability, if significantly negative or unfavorable, could have a material adverse effect on the outcome of the Company’s impairment evaluation and financial condition or future results of operations.

Stock-Based Compensation—The Company accounts for stock-based employee compensation plans using the fair value-based method of accounting in accordance with FASB ASC Topic 718, Stock Compensation. ASC 718 was effective for companies in 2006; however, the Company had been recognizing compensation expense since January 1, 2003. The Company’s results of operations reflect compensation expense for all employee stock-based compensation, including the unvested portion of stock options granted prior to 2003. ASC 718 requires that management make assumptions including stock price volatility and employee turnover that are utilized to measure compensation expense. The fair value of stock options granted is estimated at the date of grant using the Black-Scholes option-pricing model. This model requires the input of subjective assumptions.

Other-Than-Temporarily Impaired Securities—The Company’s available for sale securities portfolio is reported at fair value. When the fair value of a security is below its amortized cost, and depending on the length of time the condition exists and the extent the fair market value is below amortized cost, additional analysis is performed to determine whether an impairment exists. Available for sale and held to maturity securities are analyzed quarterly for possible other-than-temporary impairment. The analysis considers (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, (iii) whether the market decline was affected by macroeconomic conditions, and (iv) whether the entity has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery. Often, the information available to conduct these assessments is limited and rapidly changing, making estimates of fair value subject to judgment. If actual information or conditions are different than estimated, the extent of the impairment of the security may be different than previously estimated, which could have a material effect on the Company’s results of operations and financial condition.

RESULTS OF OPERATIONS

Net income available to common shareholders was $31.7 million ($0.68 per common share on a diluted basis) for the quarter ended June 30, 2010 compared with $26.5 million ($0.57 per common share on a diluted basis) for the quarter ended June 30, 2009, an increase in net income of $5.2 million or 19.8%. The Company posted returns on average common equity of 9.12% and 8.18%, returns on average assets of 1.34% and 1.20% and efficiency ratios of 46.04% and 48.98% for the quarters ended June 30, 2010 and 2009, respectively. The efficiency ratio is calculated by dividing total noninterest expense (excluding credit loss provisions) by net interest income plus noninterest income (excluding net gains and losses on the sale of securities and assets). Additionally, taxes are not part of this calculation.

20

For the six months ended June 30, 2010, net income available to common shareholders was $62.7 million ($1.34 per common share on a diluted basis) compared with $52.0 million ($1.13 per common share on a diluted basis) for the same period in 2009, an increase in net income of $10.8 million or 20.7%. The Company posted returns on average common equity of 9.05% and 8.12%, returns on average assets of 1.36% and 1.17% and efficiency ratios of 44.93% and 49.22% for the six months ended June 30, 2010 and 2009, respectively.

Net Interest Income

The Company’s net interest income is affected by changes in the amount and mix of interest-earning assets and interest-bearing liabilities, referred to as a “volume change.” It is also affected by changes in yields earned on interest-earning assets and rates paid on interest-bearing deposits and other borrowed funds, referred to as a “rate change.”

Net interest income before the provision for credit losses was $80.6 million for the quarter ended June 30, 2010 compared with $75.5 million for the quarter ended June 30, 2009, an increase of $5.1 million, or 6.7%. Net interest income increased as a result of an increase in average interest-earning assets to $8.16 billion for the quarter ended June 30, 2010 compared with $7.56 billion for the quarter ended June 30, 2009, an increase of $595.8 million, or 7.9%. The increase in average earning assets was primarily attributable to increases in average securities primarily resulting from the investment of funds received in the purchase of the U.S. Bank and First Bank branches. The increase is net interest income was also due to decreased interest expense resulting from lower deposit pricing.

The net interest margin on a tax equivalent basis decreased to 4.00% for the quarter ended June 30, 2010 compared with 4.04% for the quarter ended June 30, 2009. The average rate paid on interest-bearing liabilities decreased 66 basis points from 1.83% for the quarter ended June 30, 2009 to 1.17% for the quarter ended June 30, 2010. The average yield on earning assets decreased 56 basis points from 5.45% for the quarter ended June 30, 2009 to 4.89% for the quarter ended June 30, 2010. The volume of interest-bearing liabilities increased $489.0 million and the volume of interest-earning assets increased $555.8 million for the same periods.

Net interest income before the provision for credit losses increased $8.8 million, or 5.9%, to $158.4 million for the six months ended June 30, 2010 compared with $149.6 million for the same period in 2009. This increase was mainly attributable to higher average interest-earning assets resulting from an increase in average securities primarily due to the investment of funds received in the U.S. Bank and First Bank branch purchases. The net interest margin on a tax equivalent basis increased to 4.09% compared with 4.01% for the same periods principally due to a 76 basis point decrease in the average rate paid on interest-bearing liabilities from 1.97% for the six months ended June 30, 2009 to 1.21% for the six months ended June 30, 2010 and a 51 basis point decrease in the average yield on earning assets from 5.53% for the six months ended June 30, 2009 to 5.02% for the six months ended June 30, 2010.

21

The following tables set forth, for each category of interest-earning assets and interest-bearing liabilities, the average amounts outstanding, the interest earned or paid on such amounts, and the average rate earned or paid for the three and the six month periods ended June 30, 2010 and 2009. The tables also set forth the average rate paid on total interest-bearing liabilities, and the net interest margin on average total interest-earning assets for the same periods. Except as indicated in the footnotes, no tax-equivalent adjustments were made and all average balances are daily average balances. Any nonaccruing loans have been included in the table as loans carrying a zero yield.

	Three Months Ended June 30,
	2010							2009
	Average Outstanding Balance			Interest Earned/ Paid		Average Yield/ Rate (2)		Average Outstanding Balance			Interest Earned/ Paid		Average Yield/ Rate (2)
	(Dollars in thousands)
Assets
Interest-earning assets:
Loans	$	3,404,127		$	52,681	6.21	%	$	3,472,449		$	55,248	6.38	%
Securities (1)		4,642,246			46,603	4.02			3,964,766			47,450	4.79
Federal funds sold and other temporary investments		109,027			74	0.27			122,358			70	0.23
Total interest-earning assets		8,155,400			99,358	4.89	%		7,559,573			102,768	5.45	%
Less allowance for credit losses		(52,726	)						(39,249	)
Total interest-earning assets, net of allowance		8,102,674							7,520,324
Noninterest-earning assets		1,387,543							1,313,661
Total assets	$	9,490,217						$	8,833,985
Liabilities and shareholders’ equity
Interest-bearing liabilities:
Interest-bearing demand deposits	$	1,381,215		$	2,517	0.73	%	$	1,047,363		$	2,182	0.84	%
Savings and money market accounts		2,248,950			4,292	0.77			1,878,238			4,619	0.99
Certificates of deposit		2,599,197			10,764	1.66			2,820,910			18,820	2.68
Junior subordinated debentures		92,265			799	3.47			92,265			959	4.17
Federal funds purchased and other borrowings		44,477			211	1.90			28,937			387	5.36
Securities sold under repurchase agreements.		83,092			175	0.84			92,466			280	1.21
Total interest-bearing liabilities		6,449,196			18,758	1.17	%		5,960,179			27,247	1.83	%
Noninterest-bearing liabilities:
Noninterest-bearing demand deposits		1,583,010							1,499,888
Other liabilities		65,518							78,181
Total liabilities		8,097,724							7,538,248
Shareholders’ equity		1,392,493							1,295,737
Total liabilities and shareholders’ equity	$	9,490,217						$	8,833,985
Net interest rate spread						3.72	%						3.62	%
Net interest income and margin (3)				$	80,600	3.96	%				$	75,521	4.01	%
Net interest income and margin (tax-equivalent basis) (4)				$	81,332	4.00	%				$	76,226	4.04	%

(1) Yield is based on amortized cost and does not include any component of unrealized gains or losses.

(2) Annualized.

(3) The net interest margin is equal to net interest income divided by average interest-earning assets.

(4) In order to make pretax income and resultant yields on tax-exempt investments and loans comparable to those on taxable investments and loans, a tax-equivalent adjustment has been computed using a federal income tax rate of 35%.

22

	Six Months Ended June 30,
	2010							2009
	Average Outstanding Balance			Interest Earned/ Paid		Average Yield/ Rate (2)		Average Outstanding Balance			Interest Earned/ Paid		Average Yield/ Rate (2)
	(Dollars in thousands)
Assets
Interest-earning assets:
Loans	$	3,373,654		$	104,134	6.22	%	$	3,501,488		$	111,050	6.40	%
Securities (1)		4,411,177			91,617	4.15			3,997,278			97,178	4.86
Federal funds sold and other temporary investments		84,916			103	0.24			94,631			106	0.23
Total interest-earning assets		7,869,747			195,854	5.02	%		7,593,397			208,334	5.53	%
Less allowance for credit losses		(52,240	)						(38,240	)
Total interest-earning assets, net of allowance		7,817,507							7,555,157
Noninterest-earning assets		1,369,399							1,307,993
Total assets	$	9,186,906						$	8,863,150
Liabilities and shareholders’ equity
Interest-bearing liabilities:
Interest-bearing demand deposits	$	1,382,751		$	5,255	0.77	%	$	1,058,122		$	4,304	0.82	%
Savings and money market accounts		2,143,678			8,312	0.78			1,841,147			10,676	1.17
Certificates of deposit		2,493,091			21,491	1.74			2,868,186			40,098	2.82
Junior subordinated debentures		92,265			1,590	3.48			92,265			2,078	4.54
Federal funds purchased and other borrowings		38,312			511	2.69			55,865			951	3.43
Securities sold under repurchase agreements		77,204			323	0.84			88,128			628	1.44
Total interest-bearing liabilities		6,227,301			37,482	1.21	%		6,003,713			58,735	1.97	%
Noninterest-bearing liabilities:
Noninterest-bearing demand deposits		1,514,877							1,498,136
Other liabilities		64,726							80,101
Total liabilities		7,806,904							7,581,950
Shareholders’ equity		1,380,002							1,281,200
Total liabilities and shareholders’ equity	$	9,186,906						$	8,863,150
Net interest rate spread						3.81	%						3.56	%
Net interest income and margin (3)				$	158,372	4.06	%				$	149,599	3.97	%
Net interest income and margin (tax-equivalent basis) (4)				$	159,797	4.09	%				$	150,985	4.01	%

(1) Yield is based on amortized cost and does not include any component of unrealized gains or losses.

(2) Annualized.

(3) The net interest margin is equal to net interest income divided by average interest-earning assets.

(4) In order to make pretax income and resultant yields on tax-exempt investments and loans comparable to those on taxable investments and loans, a tax-equivalent adjustment has been computed using a federal income tax rate of 35%.

23

The following tables present the dollar amount of changes in interest income and interest expense for the major components of interest-earning assets and interest-bearing liabilities and distinguishes between the increase (decrease) related to changes in outstanding balances and the volatility of interest rates. For purposes of these tables, changes attributable to both rate and volume that cannot be segregated have been allocated to rate.

	Three Months Ended June 30,
	2010 vs. 2009
	Increase (Decrease) Due to
	Volume			Rate			Total
	(In thousands)
Interest-earning assets:
Loans	$	(1,087	)	$	(1,480	)	$	(2,567	)
Securities		8,108			(8,955	)		(847	)
Federal funds sold and other temporary investments		(8	)		12			4
Total increase (decrease) in interest income		7,013			(10,423	)		(3,410	)
Interest-bearing liabilities:
Interest-bearing demand deposits		696			(361	)		335
Savings and money market accounts		912			(1,239	)		(327	)
Certificates of deposit		(1,479	)		(6,577	)		(8,056	)
Junior subordinated debentures		—			(160	)		(160	)
Federal funds purchased and other borrowings		208			(384	)		(176	)
Securities sold under repurchase agreements		(28	)		(77	)		(105	)
Total increase (decrease) in interest expense		309			(8,798	)		(8,489	)
Increase (decrease) in net interest income	$	6,704		$	(1,625	)	$	5,079
	Six Months Ended June 30,
	2010 vs. 2009
	Increase (Decrease) Due to
	Volume			Rate			Total
	(In thousands)
Interest-earning assets:
Loans	$	(4,054	)	$	(2,862	)	$	(6,916	)
Securities		10,062			(15,623	)		(5,561	)
Federal funds sold and other temporary investments		(11	)		8			(3	)
Total increase (decrease) in interest income		5,997			(18,477	)		(12,480	)
Interest-bearing liabilities:
Interest-bearing demand deposits		1,320			(369	)		951
Savings and money market accounts		1,754			(4,118	)		(2,364	)
Certificates of deposit		(5,244	)		(13,363	)		(18,607	)
Junior subordinated debentures		—			(488	)		(488	)
Federal funds purchased and other borrowings		(299	)		(141	)		(440	)
Securities sold under repurchase agreements		(78	)		(227	)		(305	)
Total increase (decrease) in interest expense		(2,547	)		(18,706	)		(21,253	)
Increase in net interest income	$	8,544		$	229		$	8,773

Provision for Credit Losses

Management actively monitors the Company’s asset quality and provides specific loss provisions when necessary. Provisions for credit losses are charged to income to bring the total allowance for credit losses to a level deemed appropriate by management of the Company based on such factors as historical credit loss experience, industry diversification of the Company’s commercial loan portfolio, the amount of nonperforming loans and related collateral, the volume growth and composition of the loan portfolio, current economic conditions that may affect the borrower’s ability to pay and the value of collateral, the evaluation of the loan portfolio through the internal loan review process and other relevant factors.

24

Loans are charged-off against the allowance for credit losses when appropriate. Although management believes it uses the best information available to make determinations with respect to the provision for credit losses, future adjustments may be necessary if economic conditions differ from the assumptions used in making the initial determinations.

The Company made a $3.3 million provision for credit losses for the quarter ended June 30, 2010 and a $6.9 million provision for the quarter ended June 30, 2009. Net charge-offs were $2.4 million for the quarter ended June 30, 2010 compared with net charge-offs of $3.5 million for the quarter ended June 30, 2009. The Company made a $7.7 million provision for credit losses for the six months ended June 30, 2010 and a $13.0 million provision for the six months ended June 30, 2009. Net charge-offs were $6.8 million for the six months ended June 30, 2010 compared with $7.4 million for the six months ended June 30, 2009.

Noninterest Income

The Company’s primary sources of noninterest income are service charges on deposit accounts and other banking service related fees. Noninterest income does not include loan origination fees which are recognized over the life of the related loan as an adjustment to yield using the interest method. Banking related service fees include check cashing fees, official check fees, safe deposit box rent and currency handling fees. Noninterest income totaled $13.3 million for the three months ended June 30, 2010 compared with $15.1 million for the same period in 2009, a decrease of $1.8 million, or 12.1%. Noninterest income decreased $3.9 million, or 12.9%, to $26.3 million for the six months ended June 30, 2010 compared with $30.2 million for the same period in 2009. Both decreases were primarily due to an increase in losses on sale of ORE and a decrease in insufficient funds charges.

The net loss on sale of ORE was $1.7 million for the three months ended June 30, 2010 compared with a net gain of $415,000 for the three months ended June 30, 2009. The net loss on sale of ORE was $2.0 million for the six months ended June 30, 2010 compared with a net gain of $437,000 for the same period in 2009.

Other noninterest income increased $23,000 or 4.8% to $502,000 for the three months ended June 30, 2010 compared with $479,000 for the same period in 2009. Other noninterest income decreased $687,000 or 38.7% to $1.1 million for the six months ended June 30, 2010 compared with $1.8 million for the same period in 2009. The decrease was primarily due to loan servicing income paid by the FDIC related to loans of Franklin Bank that the Bank serviced on behalf of the FDIC but did not purchase. The loan servicing agreement ended in April 2009.

The following table presents, for the periods indicated, the major categories of noninterest income:

	Three Months Ended June 30,					Six Months Ended June 30,
	2010			2009		2010			2009
	(In thousands)
Service charges on deposit accounts	$	12,680		$	12,863	$	24,269		$	25,235
Banking related service fees		546			501		1,015			992
Brokered mortgage income		50			140		63			210
Investment income		136			115		350			368
Income from leased assets		74			82		147			168
Bank owned life insurance income (BOLI)		598			338		925			667
Net gain on sale of assets		399			200		399			297
Net gain (loss) on sale of ORE		(1,689	)		415		(1,983	)		437
Other noninterest income		502			479		1,089			1,776
Total noninterest income	$	13,296		$	15,133	$	26,274		$	30,150

25

Noninterest Expense

Noninterest expense totaled $43.0 million for the quarter ended June 30, 2010 compared with $44.3 million for the quarter ended June 30, 2009, a decrease of $1.3 million or 2.8%. Noninterest expense totaled $82.8 million for the six months ended June 30, 2010 compared with $88.3 million for the six months ended June 30, 2009, a decrease of $5.5 million or 6.3%. Both decreases occurred primarily in reduced regulatory assessments and FDIC insurance. The following table presents, for the periods indicated, the major categories of noninterest expense:

	Three Months Ended June 30,				Six Months Ended June 30,
	2010		2009		2010		2009
	(In thousands)
Salaries and employee benefits (1)	$	22,431	$	20,494	$	43,543	$	43,142
Non-staff expenses:
Net occupancy expense		3,708		3,514		7,142		7,492
Depreciation		2,147		2,069		4,153		4,070
Data processing		1,742		1,562		3,157		3,617
Communications expense		2,016		2,114		4,035		4,331
Printing and supplies		486		732		964		1,325
Professional fees		905		722		1,621		1,369
Regulatory assessments and FDIC insurance		2,801		5,771		5,410		8,752
Ad valorem and franchise taxes		982		931		1,918		1,874
Core deposit intangibles amortization		2,280		2,492		4,570		5,156
Other		3,551		3,899		6,261		7,195
Total non-staff expenses		20,618		23,806		39,231		45,181
Total noninterest expense	$	43,049	$	44,300	$	82,774	$	88,323

(1) Includes stock based compensation expense of $692,000 and $294,000 for the three months ended June 30, 2010 and 2009, respectively, and $1.5 million and $620,000 for the six months ended June 30, 2010 and 2009, respectively.

Salaries and employee benefit expenses were $22.4 million for the quarter ended June 30, 2010 compared with $20.5 million for the quarter ended June 30, 2009, an increase of $1.9 million, or 9.5%. The increase was principally due to the new associates hired in connection with the U.S. Bank and First Bank branch acquisitions. For the six months ended June 30, 2010, salaries and employee benefit expenses were $43.5 million, an increase of $401,000 or 0.9% compared with $43.1 million for the six months ended June 30, 2009. The number of full-time equivalent (FTE) associates employed by the Company was 1,753 at June 30, 2010, 1,651 at March 31, 2010 and 1,634 at June 30, 2009.

Regulatory assessments and FDIC insurance decreased $3.0 million, or 51.5%, to $2.8 million for the quarter ended June 30, 2010 compared with $5.8 million during the same period in 2009. Regulatory assessments and FDIC insurance decreased $3.3 million, or 38.2%, to $5.4 million for the six months ended June 30, 2010 compared with $8.8 million during the same period in 2009. The decreases in both periods were due to the special assessment of 5 basis points on total assets minus total Tier 1 capital imposed by the FDIC as of June 30, 2009. The special assessment was paid on September 30, 2009.

Income Taxes

Income tax expense increased $2.9 million or 22.3% to $15.8 million for the quarter ended June 30, 2010 compared with $12.9 million for the same period in 2009. For the six months ended June 30, 2010, income tax expense totaled $31.4 million, an increase of $5.0 million or 19.0% compared with $26.4 million for the same period in 2009. The increase was primarily attributable to higher pretax net earnings for the three and six months ended June 30, 2010 compared with the same respective periods in 2009. The effective tax rate for the three months ended June 30, 2010 and 2009 was 33.3% and 32.8%, respectively. The effective tax rate for the six months ended June 30, 2010 and 2009 was 33.4% and 33.7%, respectively.

26

FINANCIAL CONDITION

Loan Portfolio

Total loans were $3.42 billion at June 30, 2010, an increase of $48.3 million or 1.4% compared with $3.38 billion at December 31, 2009.

The following table summarizes the loan portfolio of the Company by type of loan as of June 30, 2010 and December 31, 2009:

	June 30, 2010				December 31, 2009
	Amount		Percent		Amount		Percent
	(Dollars in thousands)
Commercial and industrial	$	409,657	12.0	%	$	392,975	11.6	%
Real estate:
Construction and land development		514,793	15.0			557,245	16.5
1-4 family residential		758,670	22.2			709,101	21.0
Home equity		116,071	3.4			117,661	3.5
Commercial mortgages		1,268,731	37.0			1,261,267	37.4
Farmland		97,531	2.8			93,288	2.8
Multifamily residential		81,103	2.4			77,952	2.3
Agriculture		51,239	1.5			42,241	1.3
Consumer (net of unearned discount)		96,628	2.8			102,436	3.0
Other		30,617	0.9			22,537	0.6
Total loans	$	3,425,040	100.0	%	$	3,376,703	100.0	%

Nonperforming Assets

The Company had $21.9 million in nonperforming assets at June 30, 2010 and $16.4 million in nonperforming assets at December 31, 2009, an increase of $5.5 million or 33.6%. The ratio of nonperforming assets to loans and other real estate was 0.64% at June 30, 2010 compared with 0.48% at December 31, 2009.

The Company generally places a loan on nonaccrual status and ceases accruing interest when the payment of principal or interest is delinquent for 90 days, or earlier in some cases, unless the loan is in the process of collection and the underlying collateral fully supports the carrying value of the loan.

The following table presents information regarding nonperforming assets as of the dates indicated:

	June 30, 2010			December 31, 2009
	(Dollars in thousands)
Nonaccrual loans	$	3,302		$	6,079
Accruing loans 90 or more days past due		5,761			2,332
Total nonperforming loans		9,063			8,411
Repossessed assets		273			116
Other real estate		12,520			7,829
Total nonperforming assets	$	21,856		$	16,356
Nonperforming assets to total loans and other real estate		0.64	%		0.48	%
Nonperforming assets to average earning assets		0.27	%		0.22	%

27

The following table presents information regarding nonperforming assets by type as of the dates indicated:

	June 30, 2010		December  31, 2009
	(Dollars in thousands)
Commercial	$	1,670	$	1,390
Construction		7,293		5,622
1-4 family (including home equity)		4,920		2,383
Commercial real estate (including multi-family)		7,691		6,834
Agriculture and agriculture real estate		43		—
Consumer		239		127
Total nonperforming assets	$	21,856	$	16,356

Allowance for Credit Losses

Management actively monitors the Company’s asset quality and provides specific loss allowances when necessary. Loans are charged-off against the allowance for credit losses when appropriate. Although management believes it uses the best information available to make determinations with respect to the allowance for credit losses, future adjustments may be necessary if economic conditions differ from the assumptions used in making the initial determinations. As of June 30, 2010, the allowance for credit losses amounted to $52.7 million or 1.54% of total loans compared with $51.9 million or 1.54% of total loans at December 31, 2009.

Set forth below is an analysis of the allowance for credit losses for the six months ended June 30, 2010 and the year ended December 31, 2009:

	Six Months Ended June 30, 2010			Year Ended December 31, 2009
	(Dollars in thousands)
Average loans outstanding	$	3,373,654		$	3,455,761
Gross loans outstanding at end of period	$	3,425,040		$	3,376,703
Allowance for credit losses at beginning of period	$	51,863		$	36,970
Provision for credit losses		7,685			28,775
Charge-offs:
Commercial and industrial		(1,403	)		(3,816	)
Real estate and agriculture		(5,291	)		(8,585	)
Consumer		(944	)		(2,998	)
Recoveries:
Commercial and industrial		207			275
Real estate and agriculture		116			236
Consumer		494			1,006
Net charge-offs		(6,821	)		(13,882	)
Allowance for credit losses at end of period	$	52,727		$	51,863
Ratio of allowance to end of period loans		1.54	%		1.54	%
Ratio of net charge-offs to average loans (annualized)		0.40	%		0.40	%
Ratio of allowance to end of period nonperforming loans		581.8	%		616.6	%

28

Securities

The carrying cost of securities totaled $4.82 billion at June 30, 2010 compared with $4.12 billion at December 31, 2009, an increase of $699.6 million or 17.0%. At June 30, 2010, securities represented 50.1% of total assets compared with 46.5% of total assets at December 31, 2009.

The following table summarizes the amortized cost of securities as of the dates shown (available for sale securities are not adjusted for unrealized gains or losses):

	June 30, 2010		December  31, 2009
	(Dollars in thousands)
U.S. Treasury securities and obligations of U.S. government agencies	$	22,960	$	41,715
States and political subdivisions		100,395		103,074
Corporate debt securities		2,981		3,227
Collateralized mortgage obligations		544,298		296,923
Mortgage-backed securities		4,111,897		3,640,208
Equity securities		7,288		7,288
Total amortized cost	$	4,789,819	$	4,092,435
Total fair value	$	4,980,512	$	4,233,256

Management evaluates securities for other-than-temporary impairment (“OTTI”) at least on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. The investment securities portfolio is evaluated for OTTI by segregating the portfolio into two general segments and applying the appropriate OTTI model. Investment securities classified as available for sale or held to maturity are generally evaluated for OTTI under FASB ASC Topic 320, Investments—Debt and Equity Securities. Certain purchased beneficial interests, including non-agency mortgage-backed securities, asset-backed securities, and collateralized debt obligations, that had credit ratings at the time of purchase of below AA are evaluated using the model outlined in ASC Topic 325, Investments-Other. The Company currently does not own any securities that are accounted for under ASC Topic 325.

In determining OTTI under ASC Topic 320, management considers many factors, including: (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, (iii) whether the market decline was affected by macroeconomic conditions, and (iv) whether the entity has the intent to sell the debt security or more likely than not will be required to sell the debt security before its anticipated recovery. The assessment of whether an OTTI decline exists involves a high degree of subjectivity and judgment and is based on the information available to management at a point in time. If applicable, the second segment of the portfolio uses the OTTI guidance provided by ASC Topic 325 that is specific to purchased beneficial interests that, on the purchase date, were rated below AA. Under the ASC Topic 325 model, the Company compares the present value of the remaining cash flows as estimated at the preceding evaluation date to the current expected remaining cash flows. An OTTI is deemed to have occurred if there has been an adverse change in the remaining expected future cash flows.

When OTTI occurs under either model, the amount of the OTTI recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current period credit loss, the OTTI shall be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current period loss, the OTTI shall be separated into the amount representing the credit loss and the amount related to all other factors. The amount of the total OTTI related to the credit loss is determined based on the present value of cash flows expected to be collected and is recognized in earnings. The amount of the total OTTI related to other factors shall be recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings shall become the new amortized cost basis of the investment.

Management does not intend to sell any debt securities or more likely than not will not be required to sell any debt securities before their anticipated recovery, at which time the Company will receive full value for the securities. Furthermore, management has the intent to hold the securities classified as available for sale that were in a loss position as of June 30, 2010 for a period of time sufficient for an entire recovery of the cost basis of the securities. The unrealized losses are largely due to

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increases in market interest rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of June 30, 2010, management believes any impairment in the Company’s securities are temporary and no impairment loss has been realized in the Company’s consolidated income statement.

The following tables present the amortized cost and fair value of securities classified as available for sale at June 30, 2010:

	June 30, 2010
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(Dollars in thousands)
U.S. Treasury securities and obligations of U.S. government agencies.	$	1,006	$	13	$	—		$	1,019
States and political subdivisions		54,960		1,840		(16	)		56,784
Corporate debt securities and other		8,769		206		—			8,975
Collateralized mortgage obligations		1,072		—		(20	)		1,052
Mortgage-backed securities		416,470		26,098		(93	)		442,475
Total	$	482,277	$	28,157	$	(129	)	$	510,305

The following tables present the amortized cost and fair value of securities classified as held to maturity at June 30, 2010:

	June 30, 2010
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(Dollars in thousands)
U.S. Treasury securities and obligations of U.S. government agencies.	$	21,954	$	1,280	$	—		$	23,234
States and political subdivisions		45,435		1,487		(260	)		46,662
Corporate debt securities		1,500		187		—			1,687
Collateralized mortgage obligations		543,226		6,750		(810	)		549,166
Mortgage-backed securities		3,695,427		154,045		(14	)		3,849,458
Total	$	4,307,542	$	163,749	$	(1,084	)	$	4,470,207

Premises and Equipment

Premises and equipment, net of accumulated depreciation, totaled $161.3 million and $148.9 million at June 30, 2010 and December 31, 2009, respectively, an increase of $12.4 million or 8.3%. The increase was primarily due to the purchase of the U.S. Bank and First Bank branches.

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Deposits

Total deposits were $7.81 billion at June 30, 2010 compared with $7.26 billion at December 31, 2009, an increase of $555.4 million or 7.7%. The increase was primarily due to the acquisition of the U.S. Bank and First Bank branches. At June 30, 2010, noninterest-bearing deposits accounted for approximately 20.2% of total deposits compared with 20.6% of total deposits at December 31, 2009. Interest-bearing demand deposits totaled $6.24 billion or 79.8% of total deposits at June 30, 2010 compared with $5.77 billion or 79.4% of total deposits at December 31, 2009.

The following table summarizes the daily average balances and weighted average rates paid on deposits for the periods presented below:

	Six Months Ended June 30, 2010				Year Ended December 31, 2009
	Average Balance		Average Rate		Average Balance		Average Rate
	(Dollars in thousands)
Interest-bearing demand	$	1,382,751	0.77	%	$	1,082,332	0.79	%
Regular savings		350,843	0.50			320,530	0.56
Money market savings		1,792,835	0.84			1,590,191	1.11
Time deposits		2,493,091	1.74			2,730,263	2.48
Total interest-bearing deposits		6,019,520	1.17			5,723,316	1.67
Noninterest-bearing deposits		1,514,877	—			1,488,699	—
Total deposits	$	7,534,397	0.94	%	$	7,212,015	1.33	%

Other Borrowings

The Company utilizes borrowings to supplement deposits to fund its lending and investment activities. Borrowings consist of funds from the Federal Home Loan Bank (“FHLB”) and correspondent banks. FHLB advances are considered short-term, overnight borrowings. At June 30, 2010, the Company had $140.0 million in FHLB advances and $14.9 million in FHLB long-term notes payable compared with no FHLB advances and $26.1 million in FHLB long-term notes payable at December 31, 2009. FHLB advances are available to the Company under a security and pledge agreement. At June 30, 2010, the Company had total funds of $3.10 billion available under this agreement of which $154.9 million was outstanding. The weighted average interest rate paid on the FHLB notes payable at period end was 5.2%. The maturity dates on the FHLB notes payable range from the years 2011 to 2028 and have interest rates ranging from 3.55% to 6.10%. The highest outstanding balance of FHLB advances during the six months ended June 30, 2010 was $218.0 million compared with $231.0 million for the year ended December 31, 2009. The average rate paid on FHLB advances for the six months ended June 30, 2010 was 0.13%.

At June 30, 2010, the Company had $93.1 million in securities sold under repurchase agreements compared with $72.6 million at December 31, 2009, an increase of $20.5 million or 28.2%.

The following table presents the Company’s borrowings at June 30, 2010 and December 31, 2009:

	June 30, 2010		December  31, 2009
	(Dollars in thousands)
FHLB advances	$	140,000	$	—
FHLB long-term notes payable		14,935		26,140
Total other borrowings		154,935		26,140
Securities sold under repurchase agreements		93,060		72,596
Total	$	247,995	$	98,736

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Junior Subordinated Debentures

At June 30, 2010 and December 31, 2009, the Company had outstanding $92.3 million in junior subordinated debentures issued to the Company’s unconsolidated subsidiary trusts. A summary of pertinent information related to the Company’s eight issues of junior subordinated debentures outstanding at June 30, 2010 is set forth in the table below:

Description	Issuance Date	Trust Preferred Securities Outstanding		Interest Rate(1)	Junior Subordinated Debt Owed to Trusts		Maturity Date(2)
Prosperity Statutory Trust II	July 31, 2001	$	15,000,000	3 month LIBOR + 3.58%, not to exceed 12.50%	$	15,464,000	July 31, 2031
Prosperity Statutory Trust III	Aug. 15, 2003		12,500,000	3 month LIBOR +  3.00%(3)		12,887,000	Sept. 17, 2033
Prosperity Statutory Trust IV	Dec. 30, 2003		12,500,000	3 month LIBOR + 2.85%(4)		12,887,000	Dec. 30, 2033
SNB Capital Trust IV(5)	Sept. 25, 2003		10,000,000	3 month LIBOR + 3.00%		10,310,000	Sept. 25, 2033
TXUI Statutory Trust I(6)	Sept. 07, 2000		7,000,000	10.60%		7,210,000	Sept. 07, 2030
TXUI Statutory Trust II(6)	Dec. 19, 2003		5,000,000	3 month LIBOR + 2.85%(7)		5,155,000	Dec. 19, 2033
TXUI Statutory Trust III(6)	Nov. 30, 2005		15,500,000	3 month LIBOR + 1.39%		15,980,000	Dec. 15, 2035
TXUI Statutory Trust IV(6)	Mar. 31, 2006		12,000,000	3 month LIBOR + 1.39%		12,372,000	June 30, 2036

(1) The 3-month LIBOR in effect as of June 30, 2010 was 0.534%.

(2) All debentures are callable five years from issuance date except for TXUI Statutory Trust I which is callable ten years from issuance date.

(3) The debentures bore a fixed interest rate of 6.50% until September 17, 2008, when the rate began to float on a quarterly basis based on the 3-month LIBOR plus 3.00%.

(4) The debentures bore a fixed interest rate of 6.50% until December 30, 2008, when the rate began to float on a quarterly basis based on the 3-month LIBOR plus 2.85%.

(5) Assumed in connection with the SNB acquisition on April 1, 2006.

(6) Assumed in connection with the TXUI acquisition on January 31, 2007.

(7) The debentures bore a fixed interest rate of 6.45% until January 23, 2009, when the rate began to float on a quarterly basis based on the 3-month LIBOR plus 2.85%.

Liquidity

Liquidity involves the Company’s ability to raise funds to support asset growth or reduce assets to meet deposit withdrawals and other payment obligations, to maintain reserve requirements and otherwise to operate the Company on an ongoing basis. The Company’s largest source of funds is deposits and its largest use of funds is loans. The Company does not expect a change in the source or use of its funds in the future. Although access to purchased funds from correspondent banks is available and has been utilized on occasion to take advantage of investment opportunities, the Company does not generally rely on these external funding sources. The cash and federal funds sold position, supplemented by amortizing investment and loan portfolios, has generally created an adequate liquidity position.

As of June 30, 2010, the Company had outstanding $462.3 million in commitments to extend credit and $15.1 million in commitments associated with outstanding standby letters of credit. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the total outstanding may not necessarily reflect the actual future cash funding requirements.

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The Company has no exposure to future cash requirements associated with known uncertainties or capital expenditures of a material nature.

Asset liquidity is provided by cash and assets which are readily marketable or which will mature in the near future. As of June 30, 2010, the Company had cash and cash equivalents of $149.2 million compared with $195.3 million at December 31, 2009, a decrease of $46.1 million. The decrease was primarily due to a decrease in deposits of $312.4 million, purchases of securities of $2.32 billion, premiums paid for acquisitions of $40.0 million and purchases of premises and equipment of $11.5 million, partially offset by proceeds from the maturities and repayments of securities of $1.62 billion, a decrease in loans of $52.7 million, net earnings of $62.7 million, proceeds from the sale of bank premises, equipment and ORE of $21.2 million, net proceeds from short-term debt of $140.0 million, an increase in securities sold under repurchase agreements of $16.7 million and cash received from acquisitions of $724.5 million.

Contractual Obligations

The following table summarizes the Company’s contractual obligations and other commitments to make future payments as of June 30, 2010 (other than deposit obligations). The payments do not include pre-payment options that may be available to the Company. The Company’s future cash payments associated with its contractual obligations pursuant to its junior subordinated debentures, FHLB notes payable and operating leases as of June 30, 2010 are summarized below. Payments for junior subordinated debentures include interest of $72.6 million that will be paid over the future periods. The future interest payments were calculated using the current rate in effect at June 30, 2010. With respect to floating interest rates, the payments were determined based on the 3-month LIBOR in effect at June 30, 2010. The current principal balance of the junior subordinated debentures at June 30, 2010 was $92.3 million. Payments for FHLB notes payable include interest of $4.6 million that will be paid over the future periods. Payments related to leases are based on actual payments specified in underlying contracts.

	Payments due in:
	Remaining Fiscal 2010		Fiscal 2011-2012		Fiscal 2013-2014		Thereafter		Total
	(Dollars in thousands)
Junior subordinated debentures	$	1,606	$	6,425	$	6,425	$	150,434	$	164,890
Federal Home Loan Bank notes payable		738		4,062		3,258		11,458		19,516
Operating leases		2,156		6,836		4,190		869		14,051
Total	$	4,500	$	17,323	$	13,873	$	162,761	$	198,457

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions, which, in accordance with accounting principles generally accepted in the United States, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets.

The Company’s commitments associated with outstanding standby letters of credit and commitments to extend credit as of June 30, 2010 are summarized below. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements:

	Remaining Fiscal 2010		Fiscal 2011-2012		Fiscal 2013-2014		Thereafter		Total
	(Dollars in thousands)
Standby letters of credit	$	10,087	$	4,785	$	196	$	—	$	15,068
Commitments to extend credit		138,432		175,750		1,725		146,359		462,266
Total	$	148,519	$	180,535	$	1,921	$	146,359	$	477,334

Capital Resources

Total shareholders’ equity was $1.40 billion at June 30, 2010 compared with $1.35 billion at December 31, 2009, an increase of $52.9 million or 3.9%. The increase was due primarily to net earnings of $62.7 million and an increase in unrealized gain on available for sale securities of $1.4 million, partially offset by dividends paid of $14.4 million for the six months ended June 30, 2010.

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Both the Board of Governors of the Federal Reserve System with respect to the Company, and the Federal Deposit Insurance Corporation (“FDIC”) with respect to the Bank, have established certain minimum risk-based capital standards that apply to bank holding companies and federally insured banks. The following table sets forth the Company’s total risk-based capital, Tier 1 risk-based capital and Tier 1 to average assets (leverage) ratios as of June 30, 2010:

Consolidated Capital Ratios:
Total capital (to risk weighted assets)	13.56	%
Tier 1 capital (to risk weighted assets)	12.31	%
Tier 1 capital (to average assets)	6.10	%

As of June 30, 2010, the Bank’s risk-based capital ratios were above the levels required for the Bank to be designated as “well capitalized” by the FDIC. To be designated as “well capitalized”, the minimum ratio requirements for the Bank’s total risk-based capital, Tier 1 risk-based capital, and Tier 1 to average assets (leverage) capital ratios must be 10.0%, 6.0% and 5.0%, respectively. The following table sets forth the Bank’s total risk-based capital, Tier 1 risk-based capital and Tier 1 to average assets (leverage) ratios as of June 30, 2010:

Capital Ratios (Bank Only):
Total capital (to risk weighted assets)	13.30	%
Tier 1 capital (to risk weighted assets)	12.06	%
Tier 1 capital (to average assets)	5.97	%

The Company and the Bank elected to not participate in the U.S. Department of Treasury Capital Purchase Program, which is a part of the Troubled Asset Relief Program.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The Company manages market risk, which for the Company is primarily interest rate risk, through its Asset Liability Committee which is composed of senior officers of the Company, in accordance with policies approved by the Company’s Board of Directors.

The Company uses simulation analysis to examine the potential effects of market changes on net interest income and market value. The Company considers macroeconomic variables, Company strategy, liquidity and other factors as it quantifies market risk. See the Company’s Annual Report on Form 10-K, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations-Interest Rate Sensitivity and Liquidity” which was filed on March 1, 2010 for further discussion.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of disclosure controls and procedures. As of the end of the period covered by this report, the Company carried out an evaluation, under the supervision and with the participation of its management, including its Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of its disclosure controls and procedures. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management was required to apply judgment in evaluating its controls and procedures. Based on this evaluation, the Company’s Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) were effective as of the end of the period covered by this report.

Changes in internal control over financial reporting. There were no changes in the Company’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended June 30, 2010 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

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PART II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

The Company and the Bank are defendants, from time to time, in legal actions arising from transactions conducted in the ordinary course of business. The Company and Bank believe, after consultations with legal counsel, that the ultimate liability, if any, arising from such actions will not have a material adverse effect on their financial statements.

ITEM 1A. RISK FACTORS

There have been no material changes in the Company’s risk factors from those disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2009.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

a. Not applicable

b. Not applicable

c. Not applicable

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

Not applicable

ITEM 4. RESERVED

ITEM 5. OTHER INFORMATION

Not applicable

ITEM 6. EXHIBITS

Exhibit Number	Description of Exhibit
3.1	Amended and Restated Articles of Incorporation of Prosperity Bancshares, Inc. (incorporated herein by reference to Exhibit 3.1 to the Company’s Registration Statement on Form S-1 (Registration No. 333-63267) (the “Registration Statement”))
3.2	Articles of Amendment to Amended and Restated Articles of Incorporation of Prosperity Bancshares, Inc. (incorporated herein by reference to Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2006)
3.3	Amended and Restated Bylaws of Prosperity Bancshares, Inc. (incorporated herein by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed on October 19, 2007)
4.1	Form of certificate representing shares of the Company’s common stock (incorporated by reference to Exhibit 4 to the Registration Statement)
31.1*	Certification of the Chief Executive Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended
31.2*	Certification of the Chief Financial Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended
32.1**	Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2**	Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101*	Interactive Financial Data

* Filed with this Quarterly Report on Form 10-Q.

** Furnished with this Quarterly Report on Form 10-Q.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	PROSPERITY BANCSHARES, INC. ® (Registrant)
Date: 08/09/10	/S/    DAVID ZALMAN
	David Zalman
	Chairman and Chief Executive Officer
Date: 08/09/10	/S/    DAVID HOLLAWAY
	David Hollaway
	Chief Financial Officer

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