Prosperity Bancshares (PB) 8-K Results of Operations and Financial Condition

Exhibit 99.1

PRESS RELEASE	For more information contact:
Prosperity Bancshares, Inc.®	Dan Rollins
Prosperity Bank Plaza	Senior Vice President
4295 San Felipe	713.693.9300
Houston, Texas 77027	dan.rollins@prosperitybanktx.com

FOR IMMEDIATE RELEASE

PROSPERITY BANCSHARES, INC.^®

FOURTH QUARTER

EARNINGS UP 35.3%

• 4Q05 EPS increases 9.8% to $0.45 (Diluted)

• Record Quarterly Earnings

• Full Year EPS increases 11.3% to $1.77 (Diluted)

HOUSTON, January 20, 2006. Prosperity Bancshares, Inc.^® NASDAQ: (PRSP), the parent company of Prosperity Bank^®, reported record earnings for the quarter ended December 31, 2005. Net income for the quarter was $12.627 million or $0.45 per diluted common share, an increase in net income of $3.291 million or 35.3%, compared with $9.336 million or $0.41 per diluted common share for the same period in the prior year.

Prosperity completed its acquisition of Grapeland Bancshares, Inc. and its subsidiary First State Bank on December 1, 2005. Prosperity also completed its acquisition of First Capital Bankers, Inc. and its subsidiary FirstCapital Bank, ssb on March 1, 2005. The results of operations for these acquisitions have been included in Prosperity’s consolidated financial statements since their respective purchase dates.

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“I am proud of our record performance during 2005,” said David Zalman, Prosperity’s Chief Executive Officer and President. “We completed our largest acquisition in March with the addition of the FirstCapital Bank team. We finished the year with an even larger acquisition announcement on November 16, 2005 and expect to complete our merger with SNB Bancshares, Inc. during the second quarter of 2006.”

Zalman continued: “Our team of bankers completed a great year. A year in which we increased our footprint; maintained our commitment to superior asset quality; reported strong same store loan growth and continued to provide quality banking services to our growing list of customers.”

“As we look to 2006, we remain committed to building shareholder value through strong internal growth and strategic acquisitions,” concluded Zalman.

“As we reflect on 2005 and the extremely competitive loan and deposit environment, we are pleased with the 30.1% growth of demand deposits,” remarked Dan Rollins, President of Prosperity Bank^®. “Same location loan growth of 6.4% underscores our commitment to internal growth and is the result of our team of dedicated, customer focused lenders rolling up their sleeves and working hard to earn the business.”

“Our merger integration team is making progress daily on our plans with SNB Bancshares. We have filed our regulatory applications with the Texas Department of Banking and the FDIC and anticipate filing the proxy statement and prospectus with the SEC within the next few weeks. We remain on our original schedule and expect to complete the acquisition early in the second quarter of 2006,” added Rollins.

Results of operations for the three months ended December 31, 2005

For the three months ended December 31, 2005, net income was $12.627 million compared with $9.336 million for the same period in 2004. Net income per diluted common share was $0.45 for the three months ended December 31, 2005 compared with $0.41 for the same period in 2004. Returns on average assets, average common shareholders’ equity and average tangible shareholders’ equity for the three months ended December 31, 2005 were 1.43%, 11.14% and 27.67%, respectively. Prosperity’s efficiency ratio was 47.09% for the three months ended December 31, 2005.

Net interest income on a tax equivalent basis for the quarter ended December 31, 2005 increased 30.0%, to $29.356 million compared with $22.581 million during the same period in 2004. The increase was attributable primarily to a 26.7% increase in average earning assets combined with a 9 basis point increase in the net interest margin on a tax equivalent basis.

Non-interest income increased 20.6% to $7.515 million for the three months ended December 31, 2005 compared with $6.233 million for the same period in 2004. The increase was attributable primarily to deposit service charges on the increased number of deposit accounts as a result of the additional banking centers acquired since December 31, 2004.

Non-interest expenses increased $3.254 million or 23.3% to $17.241 million for the fourth quarter of 2005 compared with $13.987 million for the fourth quarter of 2004. The increase in non-interest

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expenses was attributable primarily to the increased operating costs associated with the additional banking centers acquired since December 31, 2004.

Loans at December 31, 2005 were $1.542 billion, an increase of $506.6 million, or 48.9%, compared with $1.036 billion at December 31, 2004. As reflected in the table below, excluding the loans acquired as a part of the First Capital and Grapeland acquisitions, internally generated, or same store, loan growth was 6.4% for 2005.

Balance Sheet Data (at period end)

(In Thousands)

	Dec 31, 2005		Sep 30, 2005		Dec 31, 2004
	(Unaudited)		(Unaudited)		(Unaudited)
Loans:
Total Loans	$	1,542,125	$	1,514,227	$	1,035,513
Acquired with Grapeland		44,656		0		0
Loans without Grapeland		1,497,469		1,514,227		1,035,513
Acquired with First Capital		395,917		422,909		0
Same Store Loans	$	1,101,552	$	1,091,318	$	1,035,513
Deposits:
Total Deposits	$	2,920,318	$	2,879,316	$	2,317,076
Assumed with Grapeland		47,332		0		0
Deposits without Grapeland	$	2,872,986	$	2,879,316	$	2,317,076
Assumed with First Capital		573,877		589,498		0
Same Store Deposits	$	2,299,109	$	2,289,818	$	2,317,076

Deposits at December 31, 2005 were $2.920 billion, an increase of $603.2 million or 26.0%, compared with $2.317 billion at December 31, 2004. As reflected in the table above, excluding deposits assumed as a part of the First Capital and Grapeland acquisitions, internally generated, or same store, linked quarter deposit growth was 1.6% on an annualized basis.

Average loans increased 48.8% or $494.0 million to $1.507 billion for the quarter ended December 31, 2005 compared with $1.013 billion for the same period of 2004. The provision for credit losses was $120,000 for the three months ended December 31, 2005 compared with $220,000 for the three months ended December 31, 2004.

Non-performing assets totaled $1.408 million or 0.05% of average earning assets at December 31, 2005 compared with $1.721 million or 0.07% of average earning assets at December 31, 2004. At December 31, 2005, the allowance for credit losses was 1.12% of total loans, compared with 1.27% of total loans at December 31, 2004.

At December 31, 2005, Prosperity had $3.586 billion in total assets, $1.542 billion in loans, $2.920 billion in deposits, and approximately 206,000 deposit and loan accounts. Assets, loans and deposits

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at December 31, 2005 grew by 32.9%, 48.9% and 26.0%, respectively, compared with their levels at December 31, 2004.

Results of operations for the twelve months ended December 31, 2005

For the twelve months ended December 31, 2005, net income was $47.860 million compared with $34.707 million for the same period in 2004. Net income per diluted common share increased 11.3% to $1.77 for the twelve months ended December 31, 2005 compared with $1.59 for the same period in 2004. Returns on average assets, average common shareholders’ equity and average tangible shareholders’ equity for the twelve months ended December 31, 2005 were 1.42%, 11.57% and 29.92%, respectively. Prosperity’s efficiency ratio was 48.91% for the twelve months ended December 31, 2005.

Net interest income on a tax equivalent basis for the twelve months ended December 31, 2005 increased 34.2%, to $112.262 million compared with $83.631 million during the same period in 2004. The increase was attributable primarily to an 28.1% increase in average earning assets combined with an 18 basis point increase in the net interest margin on a tax equivalent basis.

Non-interest income increased 30.1% to $30.021 million for the twelve months ended December 31, 2005 compared with $23.071 million for the same period in 2004. The increase was attributable primarily to deposit service charges on the increased number of deposit accounts as a result of the additional banking centers acquired since December 31, 2004.

Non-interest expenses increased $17.250 million or 33.4% to $68.957 million for the full year of 2005 compared with the full year of 2004. The increase in non-interest expenses was attributable primarily to the increased operating costs associated with the additional banking centers acquired since December 31, 2004.

Conference Call

Prosperity’s management team will host a conference call on Friday, January 20, 2006 at 10:30 a.m. Eastern Standard Time (9:30 a.m. Central Standard Time) to discuss their earnings results, the status of operational integration of the recently completed merger with First State Bank of Grapeland, the status of the proposed merger with SNB Bancshares, Inc., business trends and their outlook for 2006. Individuals and investment professionals may participate in the call by dialing 1-800-362-0595.

Alternatively, individuals may listen to the live webcast of the presentation by visiting Prosperity’s website at www.prosperitybanktx.com. The webcast may be accessed directly from Prosperity’s Investor Relations page by clicking on the “4^th Quarter Results and Webcast” link.

Acquisition of FirstCapital Bank

On March 1, 2005, Prosperity completed the acquisition of First Capital Bankers, Inc. and its Corpus Christi, Texas - based subsidiary bank, FirstCapital Bank, ssb. FirstCapital operated thirty-one (31) offices from Kingsville, south of Corpus Christi, northward to Houston. Four (4) offices were consolidated with nearby banking centers of Prosperity Bank^® in March 2005.

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Acquisition of First State Bank of Grapeland

On December 1, 2005, Prosperity completed the acquisition of Grapeland Bancshares, Inc. and its Houston County, Texas - based subsidiary bank, First State Bank. First State operated two (2) offices in Houston County; one in Crockett, Texas and the other in Grapeland, Texas, both of which are now operating as full service banking centers of Prosperity Bank^®.

Proposed Acquisition of SNB Bancshares, Inc.

On November 16, 2005, Prosperity announced the proposed acquisition of SNB Bancshares, Inc. and its Fort Bend County, Texas - based subsidiary bank, Southern National Bank of Texas. SNB operates five (5) full service banking locations and two (2) stand alone motor banks in Harris and Fort Bend Counties. SNB has one additional full service location under construction. As of December 31, 2005, SNB had, on a consolidated basis, total assets of $1.028 billion, loans of $656.1 million, deposits of $891.9 million and shareholders’ equity of $84.9 million.

Prosperity Bancshares, Inc.^®

Prosperity Bancshares^®, a $3.6 billion Houston, Texas - based regional financial holding company, formed in 1983, was named to the Keefe Bruyette & Woods, Inc. 2005 Honor Roll for achieving exceptional earnings per share growth for the past 10 years. Other recent honors include being named to the Sandler O’Neill & Partners 2005 Bank and Thrift Small All Stars, listed inUS Banker’sAugust 2005 Top 100 Publicly Traded Mid-Tier Banks, ranked #2 out of 195 publicly traded companies in the 2005 Stephens, Inc. Bank and Thrift Performance Matrix and theHouston Chronicle’sHouston 100 list.

Operating under a community banking philosophy, Prosperity seeks to develop broad customer relationships based on service and convenience. Prosperity offers a variety of traditional loan and deposit products to its customers, which consist primarily of consumers and small and medium sized businesses. In addition to established banking products, Prosperity offers a complete line of services including: Internet Banking services at www.prosperitybanktx.com, Retail Brokerage Services, MasterMoney Debit Cards, and 24 hour voice response banking. Prosperity currently operates eighty-five (85) full service banking locations, thirty-three (33) in the Houston CMSA; sixteen (16) in the Corpus Christi area; eleven (11) in the Dallas area; six (6) in the Austin area; two (2) in the East Texas area; and seventeen (17) in fifteen contiguous counties south and southwest of Houston generally along the NAFTA highway.

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Prosperity Bank^® operates the following full service banking centers:

Austin Area -	Corpus Christi Area -	Houston Area -	Liberty
Allandale		Aldine	Magnolia
Congress	Airline	Bellaire	Mont Belvieu
Lakeway	Alameda	CityWest	Needville
Oak Hill	Carmel	Copperfield	Sweeny
Research Blvd	Everhart	Cypress	West Columbia
Riverside	Northwest	Downtown	Winnie
	Saratoga	Fairfield
	Water Street	Gladebrook
Dallas Area -	Woodlawn	Heights	South Texas Area -
Abrams Centre	Alice	Highway 6	Bay City
Camp Wisdom	Aransas Pass	Holcombe	Beeville
Kiest	Kingsville	Medical Center	Cuero
Preston Road	Mathis	Memorial	East Bernard
Turtle Creek	Port Aransas	Midtown	Edna
Westmoreland	Portland	Post Oak	El Campo
Blooming Grove	Rockport	River Oaks	Goliad
Cedar Hill	Sinton	Tanglewood	Gonzales
Corsicana		Waugh Drive	Hallettsville
Ennis		Westheimer	Palacios
Red Oak	East Texas Area -	Woodcreek	Port Lavaca
	Crockett	Angleton	Seguin
	Grapeland	Clear Lake	Victoria
		Cleveland	Victoria - North
		Dayton	Wharton
		Galveston	Yoakum
		Hitchcock	Yorktown

“Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995: This release contains, and the remarks by our management on the conference call may contain, forward-looking statements within the meaning of the securities laws that are based on current expectations, assumptions’ estimates and projections about Prosperity Bancshares^®, and its subsidiaries. These forward-looking statements are not guarantees of future performance and are subject to risks and uncertainties, many of which are outside of Prosperity’s control, that may cause actual results to differ materially from those expressed or implied by the forward-looking statements. These risks and uncertainties include whether we can: continue to sustain our current internal growth rate or our total growth rate; successfully close and integrate acquisitions; continue to provide products and services that appeal to our customers; continue to have access to the debt and equity capital we need to sustain our growth; and achieve our sales objectives. Other risks include the possibility that credit quality could deteriorate; actions of competitors; changes in laws and regulations (including changes in governmental interpretations of regulations and changes in accounting standards); customer and consumer demand, including customer and consumer response to marketing; effectiveness of spending, investments or programs; fluctuations in the cost and availability of supply chain resources; economic conditions, including currency rate fluctuations and interest rate fluctuations; weather; and the stock price volatility associated with “small-cap” companies. These and various other factors are discussed in our most recent Annual Report on Form 10-K and other reports and statements we have filed with the SEC.

Copies of Prosperity Bancshares’s^® SEC filings may be downloaded from the Internet at no charge from www.prosperitybanktx.com.

- - -

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Prosperity Bancshares, Inc.^®

Financial Highlights

(Dollars and share amounts in thousands, except per share data)

	Three Months Ended				Twelve Months Ended
	Dec 31, 2005		Dec 31, 2004		Dec 31, 2005		Dec 31, 2004
	(Unaudited)		(Unaudited)		(Unaudited)		(Unaudited)
Selected Earnings and Per Share Data
Total interest income	$	44,277	$	30,308	$	162,123	$	111,756
Total interest expense		15,256		8,106		51,226		29,789
Net interest income		29,021		22,202		110,897		81,967
Provision for credit losses		120		220		480		880
Net interest income after provision for credit losses		28,901		21,982		110,417		81,087
Total non-interest income		7,515		6,233		30,021		23,071
Total non-interest expense		17,241		13,987		68,957		51,707
Net income before taxes		19,175		14,228		71,481		52,451
Federal income taxes		6,548		4,892		23,621		17,744
Net income	$	12,627	$	9,336	$	47,860	$	34,707
Basic earnings per share	$	0.46	$	0.42	$	1.79	$	1.61
Diluted earnings per share	$	0.45	$	0.41	$	1.77	$	1.59
Period end shares outstanding		27,821		22,381		27,821		22,381
Weighted average shares outstanding (basic)		27,646		22,380		26,706		21,534
Weighted average shares outstanding (diluted)		27,988		22,660		27,024		21,804

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Prosperity Bancshares, Inc.^®

Financial Highlights

(Dollars in thousands)

	Three Months Ended						Twelve Months Ended
	Dec 31, 2005			Dec 31, 2004			Dec 31, 2005			Dec 31, 2004
	(Unaudited)			(Unaudited)			(Unaudited)			(Unaudited)
Balance Sheet Averages
Total loans	$	1,507,087		$	1,013,088		$	1,435,376		$	871,736
Investment securities		1,535,898			1,325,703			1,471,067			1,383,790
Federal funds sold and other temporary investments		45,483			99,164			42,859			46,121
Total earning assets		3,088,468			2,437,955			2,949,302			2,301,647
Allowance for credit losses		(17,003	)		(12,961	)		(16,334	)		(11,454	)
Cash and due from banks		81,497			58,245			74,388			57,137
Goodwill		249,396			151,523			233,586			130,254
Core Deposit Intangibles (CDI)		21,584			12,392			20,117			9,151
Other real estate		768			294			384			257
Fixed assets, net		48,649			36,191			47,379			34,801
Other assets		56,109			21,645			52,795			21,295
Total assets	$	3,529,468		$	2,705,284		$	3,361,617		$	2,543,088
Non-interest bearing deposits	$	666,051		$	529,633		$	609,392		$	473,713
Interest bearing deposits		2,236,601			1,795,257			2,182,583			1,715,982
Total deposits		2,902,652			2,324,890			2,791,975			2,189,695
Federal funds purchased and interest bearing liabilities		83,072			36,633			70,644			40,119
Junior subordinated debentures		75,775			57,741			69,869			59,288
Other liabilities		14,444			13,119			15,427			10,712
Shareholders’ equity(A)		453,525			272,901			413,702			243,274
Total liabilities and equity	$	3,529,468		$	2,705,284		$	3,361,617		$	2,543,088

^(A) Includes ($4,570) and ($2,537), in after tax unrealized (losses) on available for sale securities for the three month periods ending December 31, 2005 and December 31, 2004, respectively, and ($4,140) and ($649) for the twelve month periods ending December 31, 2005 and December 31, 2004, respectively.

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Prosperity Bancshares, Inc.^®

Financial Highlights

(Dollars in thousands)

	Three Months Ended					Twelve Months Ended
	Dec 31, 2005			Dec 31, 2004		Dec 31, 2005			Dec 31, 2004
	(Unaudited)			(Unaudited)		(Unaudited)			(Unaudited)
Income Statement Data
Interest on loans	$	27,580		$	16,557	$	99,958		$	55,779
Interest on securities		16,236			13,260		60,866			55,241
Interest on federal funds sold and other earning assets		461			491		1,299			736
Total interest income		44,277			30,308		162,123			111,756
Interest expense - deposits		13,018			6,803		43,643			24,586
Interest expense - debentures		1,396			1,035		4,895			4,046
Interest expense - other		842			268		2,688			1,157
Total interest expense		15,256			8,106		51,226			29,789
Net interest income(B)		29,021			22,202		110,897			81,967
Provision for credit losses		120			220		480			880
Net interest income after provision for credit losses		28,901			21,982		110,417			81,087
Service charges on deposit accounts		6,325			5,388		24,985			20,215
Net gain on sale of assets		9			53		72			315
Brokered mortgage income		179			238		867			457
(Loss)/gain on sale of securities		(79	)		0		(79	)		78
Other non-interest income		1,081			554		4,176			2,006
Total non-interest income		7,515			6,233		30,021			23,071
Salaries and benefits(C)		8,968			7,402		36,672			27,861
CDI amortization		1,066			561		3,912			1,781
Net occupancy and equipment		1,791			1,467		6,663			4,815
Depreciation		1,125			725		4,462			2,843
Data processing and software amortization		778			563		2,837			2,036
Other non-interest expenses		3,513			3,269		14,411			12,371
Total non-interest expenses		17,241			13,987		68,957			51,707
Net income before taxes		19,175			14,228		71,481			52,451
Federal income taxes		6,548			4,892		23,621			17,744
Net income available to common shareholders	$	12,627		$	9,336	$	47,860		$	34,707

^(B) Net interest income on a tax equivalent basis would be $29,356 and $22,581, for the three months ended December 31, 2005 and December 31, 2004, respectively, and $112,262 and $83,631 for the twelve months ended December 31, 2005 and December 31, 2004, respectively.

^(C) Salaries and benefits includes equity compensation expenses of $139 and $96 for the three months ended December 31, 2005 and December 31, 2004, respectively, and $619 and $141 for the twelve months ended December 31, 2005 and December 31, 2004, respectively.

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Prosperity Bancshares, Inc.^®

Financial Highlights

(Dollars and share amounts in thousands, except per share data)

	Three Months Ended					Twelve Months Ended
	Dec 31, 2005		Dec 31, 2004			Dec 31, 2005		Dec 31, 2004
	(Unaudited)		(Unaudited)			(Unaudited)		(Unaudited)
Common Share and Other Data
Employees - FTE		859		653			859		653
Book value per share	$	16.70	$	12.32		$	16.70	$	12.32
Tangible book value per share	$	6.48	$	4.96		$	6.48	$	4.96
Period end shares outstanding		27,821		22,381			27,821		22,381
Weighted average shares outstanding (basic)		27,646		22,380			26,706		21,534
Weighted average shares outstanding (diluted)		27,988		22,660			27,024		21,804
Non-accrual loans	$	355	$	297		$	355	$	297
Accruing loans 90 or more days past due		788		1,083			788		1,083
Restructured loans		0		0			0		0
Total non-performing loans		1,143		1,380			1,143		1,380
Repossessed assets		26		0			26		0
Other real estate		239		341			239		341
Total non-performing assets	$	1,408	$	1,721		$	1,408	$	1,721
Allowance for credit losses at end of period	$	17,203	$	13,105		$	17,203	$	13,105
Net charge-offs	$	312	$	(25	)	$	410	$	484
Basic earnings per share	$	0.46	$	0.42		$	1.79	$	1.61
Diluted earnings per share	$	0.45	$	0.41		$	1.77	$	1.59

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Prosperity Bancshares, Inc.^®

Financial Highlights

	Three Months Ended						Twelve Months Ended
	Dec 31, 2005			Dec 31, 2004			Dec 31, 2005			Dec 31, 2004
	(Unaudited)			(Unaudited)			(Unaudited)			(Unaudited)
Performance Ratios
Return on average assets (annualized)		1.43	%		1.38	%		1.42	%		1.36	%
Return on average common equity (annualized)		11.14	%		13.68	%		11.57	%		14.27	%
Return on average tangible common equity (annualized)		27.67	%		34.26	%		29.92	%		33.41	%
Net interest margin(D) (tax equivalent) (annualized)		3.77	%		3.68	%		3.81	%		3.63	%
Efficiency ratio(E)		47.09	%		49.19	%		48.91	%		49.23	%
Asset Quality Ratios
Non-performing assets to average earning assets		0.05	%		0.07	%		0.05	%		0.07	%
Non-performing assets to loans and other real estate		0.09	%		0.17	%		0.09	%		0.17	%
Net charge-offs to average loans		0.02	%		0.00	%		0.03	%		0.06	%
Allowance for credit losses to total loans		1.12	%		1.27	%		1.12	%		1.27	%
Common Stock Market Price
High	$	32.12		$	29.53		$	32.12		$	29.53
Low	$	27.97		$	26.09		$	25.05		$	21.89
Period end market price	$	28.74		$	29.21		$	28.74		$	29.21

^(D) Net Interest Margin for all periods presented is calculated on an actual/365 day basis. Earnings releases prior to June 30, 2005 reflected Net Interest Margin calculated on a 30/360 day basis. Net Interest Margin (tax equivalent) on a 30/360 day basis would be 3.77% and 3.70% for the three months ended December 31, 2005 and December 31, 2004, respectively, and 3.81% and 3.63% for the twelve months ended December 31, 2005 and December 31, 2004, respectively.

^(E) Calculated by dividing total non-interest expense (excluding securities losses and credit loss provisions) by net interest income plus non-interest income (excluding securities gains). Additionally, taxes are not part of this calculation.

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Prosperity Bancshares, Inc.^®

Financial Highlights

(Dollars in thousands)

	Dec 31, 2005			Sep 30, 2005			Jun 30, 2005			Mar 31, 2005			Dec 31, 2004
	(Unaudited)			(Unaudited)			(Unaudited)			(Unaudited)			(Unaudited)
Balance Sheet Data (at period end)
Total loans	$	1,542,125		$	1,514,227		$	1,520,175		$	1,500,138		$	1,035,513
Investment securities(F)		1,572,479			1,488,340			1,478,350			1,486,463			1,302,792
Federal funds sold and other temporary investments		6,143			57,534			15,776			55,992			79,350
Total earning assets		3,120,747			3,060,101			3,014,301			3,042,593			2,417,655
Allowance for credit losses		(17,203	)		(16,970	)		(16,939	)		(16,934	)		(13,105	)
Cash and due from banks		91,518			76,971			72,284			71,696			58,760
Goodwill		261,964			247,965			247,133			245,256			153,180
Core deposit intangibles		22,461			22,039			23,785			24,883			11,492
Other real estate		239			41			25			720			341
Fixed assets, net		49,244			47,913			48,707			49,996			35,793
Other assets		56,932			55,912			57,520			61,537			33,112
Total assets	$	3,585,902		$	3,493,972		$	3,446,816		$	3,479,747		$	2,697,228
Demand deposits	$	674,407		$	639,790		$	607,689		$	592,238		$	518,358
Interest bearing deposits		2,245,911			2,239,526			2,240,081			2,301,443			1,798,718
Total deposits		2,920,318			2,879,316			2,847,770			2,893,681			2,317,076
Federal funds purchased and other interest bearing liabilities		102,389			80,228			77,960			69,269			38,174
Junior subordinated debentures		75,775			75,775			75,775			75,775			47,424
Other liabilities		22,783			11,918			9,008			14,874			18,907
Total liabilities		3,121,265			3,047,237			3,010,513			3,053,599			2,421,581
Shareholders’ equity(G)		464,637			446,735			436,303			426,148			275,647
Total liabilities and equity	$	3,585,902		$	3,493,972		$	3,446,816		$	3,479,747		$	2,697,228

^(F) Includes ($6,187), ($6,652), ($6,095), ($6,148) and ($4,768) in unrealized (losses) on available for sale securities for the quarterly periods ending December 31, 2005, September 30, 2005, June 30, 2005, March 31, 2005 and December 31, 2004, respectively.

^(G) Includes ($4,022), ($4,265), ($3,962), ($3,996) and ($3,099) in after tax unrealized (losses) on available for sale securities for the quarterly periods ending December 31, 2005, September 30, 2005, June 30, 2005, March 31, 2005 and December 31, 2004, respectively.

Page 12 of 17

Prosperity Bancshares, Inc.^®

Financial Highlights

Comparative Quarterly Asset Quality, Performance & Capital Ratios

	Three Months Ended
	Dec 31, 2005		Sep 30, 2005		Jun 30, 2005		Mar 30, 2005		Dec 31, 2004
	(Unaudited)		(Unaudited)		(Unaudited)		(Unaudited)		(Unaudited)
Return on average assets (annualized)	1.43	%	1.43	%	1.41	%	1.42	%	1.38	%
Return on average common equity (annualized)	11.14	%	11.28	%	11.31	%	12.87	%	13.68	%
Return on average tangible equity (annualized)	27.67	%	29.06	%	30.38	%	33.38	%	34.26	%
Net interest margin(H) (tax equivalent) (annualized)	3.77	%	3.81	%	3.82	%	3.81	%	3.68	%
Employees - FTE	859		857		902		926		653
Efficiency ratio	47.09	%	48.82	%	48.99	%	51.06	%	49.19	%
Non-performing assets to average earning assets	0.05	%	0.03	%	0.09	%	0.13	%	0.07	%
Non-performing assets to loans and other real estate	0.09	%	0.06	%	0.18	%	0.23	%	0.17	%
Net charge-offs / (recoveries) to average loans	0.02	%	0.01	%	0.01	%	(0.01	%)	0.00	%
Allowance for credit losses to total loans	1.12	%	1.12	%	1.11	%	1.13	%	1.27	%
Tier 1 risk-based capital	14.84	%	15.49	%	14.79	%	14.51	%	13.56	%
Total risk-based capital	15.88	%	16.54	%	15.84	%	15.57	%	14.67	%
Tier 1 leverage capital	7.59	%	7.81	%	7.49	%	8.63	%	6.30	%
Tangible equity to tangible assets	5.51	%	5.48	%	5.21	%	4.86	%	4.38	%
Equity to assets	12.96	%	12.79	%	12.66	%	12.25	%	10.22	%

^(H) Net Interest Margin for all periods presented is calculated on an actual/365 day basis. Earnings releases prior to June 30, 2005 reflected Net Interest Margin calculated on a monthly basis. Net Interest Margin (tax equivalent) on a 30/360 day basis would be 3.77%, 3.81%, 3.82%, 3.81% and 3.68%, for the three months ended December 31, 2005, September 30, 2005, June 30, 2005, March 31, 2005 and December 31, 2004, respectively.

Page 13 of 17

Prosperity Bancshares, Inc.^®

Supplemental Financial Data (Unaudited)

(Dollars in thousands)

YIELD ANALYSIS

	Three Months Ended Dec 31, 2005
	Average Balance			Interest Earned / Interest Paid		Average Yield/Rate
Interest Earning Assets:
Loans	$	1,507,087		$	27,580	7.26	%
Investment securities		1,535,898			16,236	4.23	%
Federal funds sold and other temporary investments		45,483			461	4.02	%
Total interest earning assets		3,088,468		$	44,277	5.69	%
Allowance for credit losses		(17,003	)
Non-interest earning assets		458,003
Total assets	$	3,529,468
Interest Bearing Liabilities:
Interest bearing demand deposits	$	452,782		$	1,135	0.99	%
Savings and money market deposits		748,194			3,575	1.90	%
Certificates and other time deposits		1,035,625			8,308	3.18	%
Junior subordinated debentures		75,775			1,396	7.31	%
Securities sold under repurchase agreements		37,358			303	3.22	%
Federal funds purchased and other borrowings		45,714			539	4.68	%
Total interest bearing liabilities		2,395,448		$	15,256	2.53	%
Non-interest bearing liabilities:
Non-interest bearing demand deposits		666,051
Other liabilities		14,444
Total liabilities		3,075,943
Shareholders’ equity		453,525
Total liabilities and shareholders’ equity	$	3,529,468
Net Interest Income & Margin				$	29,021	3.73	%
Net Interest Income & Margin (tax equivalent)				$	29,356	3.77	%

Page 14 of 17

Prosperity Bancshares, Inc.^®

Supplemental Financial Data (Unaudited)

(Dollars in thousands)

YIELD ANALYSIS

	Three Months Ended Dec 31, 2004
	Average Balance			Interest Earned / Interest Paid		Average Yield/Rate(I)
Interest Earning Assets:
Loans	$	1,013,088		$	16,557	6.50	%
Investment securities		1,325,703			13,260	4.00	%
Federal funds sold and other temporary investments		99,164			491	1.97	%
Total interest earning assets		2,437,955		$	30,308	4.95	%
Allowance for credit losses		(12,961	)
Non-interest earning assets		280,290
Total assets	$	2,705,284
Interest Bearing Liabilities:
Interest bearing demand deposits	$	504,637		$	1,338	1.05	%
Savings and money market deposits		522,135			1,187	0.90	%
Certificates and other time deposits		768,485			4,278	2.21	%
Junior subordinated debentures		57,741			1,035	7.13	%
Securities sold under repurchase agreements		23,397			73	1.24	%
Federal funds purchased and other borrowings		13,236			195	5.86	%
Total interest bearing liabilities		1,889,631		$	8,106	1.71	%
Non-interest bearing liabilities:
Non-interest bearing demand deposits		529,633
Other liabilities		13,119
Total liabilities		2,432,383
Shareholders’ equity		272,901
Total liabilities and shareholders’ equity	$	2,705,284
Net Interest Income & Margin				$	22,202	3.62	%
Net Interest Income & Margin (tax equivalent)				$	22,581	3.68	%

^(I) Average yield and average rate are calculated on an actual/366 day basis. Previous reports reflected average yield and average rate calculated on a 30/360 day basis.

Page 15 of 17

Prosperity Bancshares, Inc.^®

Supplemental Financial Data (Unaudited)

(Dollars in thousands)

YIELD ANALYSIS

	Twelve Months Ended Dec 31, 2005
	Average Balance			Interest Earned / Interest Paid		Average Yield/Rate
Interest Earning Assets:
Loans	$	1,435,376		$	99,958	6.96	%
Investment securities		1,471,067			60,866	4.14	%
Federal funds sold and other temporary investments		42,859			1,299	3.03	%
Total interest earning assets		2,949,302		$	162,123	5.50	%
Allowance for credit losses		(16,334	)
Non-interest earning assets		428,649
Total assets	$	3,361,617
Interest Bearing Liabilities:
Interest bearing demand deposits	$	477,199		$	4,666	0.98	%
Savings and money market deposits		696,237			10,683	1.53	%
Certificates and other time deposits		1,009,147			28,294	2.80	%
Junior subordinated debentures		69,869			4,895	7.01	%
Securities sold under repurchase agreements		29,850			768	2.57	%
Federal funds purchased and other borrowings		40,794			1,920	4.71	%
Total interest bearing liabilities		2,323,096		$	51,226	2.21	%
Non-interest bearing liabilities:
Non-interest bearing demand deposits		609,392
Other liabilities		15,427
Total liabilities		2,947,915
Shareholders’ equity		413,702
Total liabilities and shareholders’ equity	$	3,361,617
Net Interest Income & Margin				$	110,897	3.76	%
Net Interest Income & Margin (tax equivalent)				$	112,262	3.81	%

Page 16 of 17

Prosperity Bancshares, Inc.^®

Supplemental Financial Data (Unaudited)

(Dollars in thousands)

YIELD ANALYSIS

	Twelve Months Ended Dec 31, 2004
	Average Balance			Interest Earned / Interest Paid		Average Yield/Rate(J)
Interest Earning Assets:
Loans	$	871,736		$	55,779	6.40	%
Investment securities		1,383,790			55,241	3.99	%
Federal funds sold and other temporary investments		46,121			736	1.60	%
Total interest earning assets		2,301,647		$	111,756	4.86	%
Allowance for credit losses		(11,454	)
Non-interest earning assets		252,895
Total assets	$	2,543,088
Interest Bearing Liabilities:
Interest bearing demand deposits	$	485,557		$	5,027	1.04	%
Savings and money market deposits		495,330			4,002	0.81	%
Certificates and other time deposits		735,095			15,557	2.12	%
Junior subordinated debentures		59,288			4,046	6.82	%
Securities sold under repurchase agreements		19,522			232	1.19	%
Federal funds purchased and other borrowings		20,597			925	4.49	%
Total interest bearing liabilities		1,815,389		$	29,789	1.64	%
Non-interest bearing liabilities:
Non-interest bearing demand deposits		473,713
Other liabilities		10,712
Total liabilities		2,299,814
Shareholders’ equity		243,274
Total liabilities and shareholders’ equity	$	2,543,088
Net Interest Income & Margin				$	81,967	3.56	%
Net Interest Income & Margin (tax equivalent)				$	83,631	3.63	%

^(J) Average yield and average rate are calculated on an actual/366 day basis. Previous reports reflected average yield and average rate calculated on a 30/360 day basis.

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Page 17 of 17