Exhibit 99

For additional information:

		Rick Green
		President & CEO
		Laura Robertson
		EVP & CFO
For Immediate Release		(405) 372-2230

Southwest Bancorp Inc. Reports 45% Increase in Net Income Available to Common Shareholders

     January 20, 2011, Stillwater, Oklahoma . . . . Southwest Bancorp, Inc. (NASDAQ Global Select Market — OKSB, OKSBP), (“Southwest”), today reported 2010 annual net income available to common shareholders of $12.8 million compared to $8.8 million for the year ended December 31, 2009, an increase of 45%. On a per share basis, 2010 annual net income available to common shareholders was $0.71 per diluted share compared to $0.60 per diluted share for the year 2009, an increase of 18%. Per share earnings reflect additional shares issued in our $54.3 million second quarter 2010 common stock offering. Total net income for 2010 was $17.0 million compared to $13.0 million for 2009, an increase of 31%.

     Net income available to common shareholders for the fourth quarter 2010 was $3.3 million, or $0.17 per diluted share, compared to $2.8 million, or $0.15 per diluted share, for the third quarter of 2010 and $2.5 million, or $0.17 per diluted share, for the fourth quarter of 2009.

     Rick Green, Southwest Bancorp’s President and Chief Executive Officer, stated, “The 2010 results put us in a position to gain momentum in 2011. Earnings for the fourth quarter were driven by stable net interest income, controlled noninterest expense, and a decrease in the required provision for loan losses.

     The Board of Directors and management are dedicated to the resolution of problem credits, the maintenance of capital and liquidity, stability in net interest income, and control of operating expenses. We continue to manage our loan portfolio with our ongoing, disciplined workout process focused on addressing the challenges of the commercial real estate construction and commercial mortgage sectors. Noncovered nonperforming assets at year-end were down $26.6 million, or 16%, from September 30, 2010. Our allowance for loan losses to noncovered nonperforming loans ratio was 61% at year-end 2010, compared with 53% at September 30, 2010 and 59% at year-end 2009.

     In the fourth quarter, we resolved, through pay-offs and charge-offs, approximately $33.4 million in nonaccrual loans, sold approximately $4.7 million of other real estate, moved approximately $7.0 million into other real estate, and classified an additional $14.8 million as nonaccrual.

     Our noncovered potential problem loans decreased by $42.8 million, or 16%, from their historical quarterly high at March 31, 2010. This decrease reflects fourth quarter 2010 activity of approximately $40.2 million in upgrades, a move of approximately $13.4 million to nonaccrual status, and the addition of $52.8 million to the category. We are encouraged that the state economic factors for our principal markets in Oklahoma, Texas, and Kansas continue to outperform most of the nation and we continue to make loans in each of our markets with an emphasis on health care lending and carefully controlled real estate collateralized credits.

     Our second quarter common stock offering gave us new common equity and we continue to build additional common equity from our core earnings. Southwest and its banking subsidiaries have maintained capital levels that substantially exceed the minimums for regulatory “well-capitalized” status. At December 31, 2010 Southwest’s total regulatory capital was $477.9 million for a total risk-based capital ratio of 19.06%, and Tier 1 capital was $446.0 million for a Tier 1 risk-based capital ratio of 17.78%.”

     Please review the following discussion and the attached financial tables for important additional information regarding our financial condition and performance.

NASDAQ: OKSB
OKSBP

Southwest Bancorp Inc. Reports 45% Increase in Net Income Available to Common Shareholders

Financial Overview

     Condition: Total assets were $2.8 billion at December 31, 2010, a decrease of 9% from December 31, 2009. At December 31, 2010 total loans were $2.4 billion, a decrease of 9% from December 31, 2009.

     At December 31, 2010 the allowance for loan losses was $65.2 million, an increase of 5% from December 31, 2009, and represented 2.80% of noncovered portfolio loans versus 2.46% at December 31, 2009. The methodology used to determine the appropriate amount of the allowance for loan losses at a particular time includes consideration of risk factors related to Southwest and to our markets including regular assessments of national and local economic conditions and trends. Provisions for loan losses are recorded in the amount necessary to maintain the allowance at the level management deems appropriate.

     Excluding assets subject to loss sharing agreements with the FDIC (“covered assets”), nonperforming assets, consisting of nonaccrual loans, loans past due by 90 days or more and still accruing, and other real estate, were $144.8 million and 6.11% of portfolio loans and other real estate as of December 31, 2010, down $26.6 million from September 30, 2010. A breakdown of noncovered portfolio loans and noncovered nonperforming assets at December 31, 2010 by type is shown in the following table:

		Noncovered				Noncovered
		portfolio				nonperforming
(dollars in thousands)		loans				assets
Real estate construction		$	457,326			$	67,571
Commercial real estate			1,295,114				30,510
Commercial			452,293				6,978
Residential real estate mortgages			87,500				1,983
Other consumer loans			39,060				41
Other real estate			—				37,722
Total		$	2,331,293			$	144,805

     Excluding covered loans, nonaccrual loans were $106.6 million as of December 31, 2010, a decrease of $28.6 million, or 21%, from September 30, 2010, and an increase of $0.7 million, or 1%, from December 31, 2009. These loans are carried at their estimated collectible amounts and no longer accrue interest. Noncovered loans 90 days or more past due were $0.5 million as of December 31, 2010. These loans are deemed to have sufficient collateral and are in the process of collection.

     Impaired loans, which include nonaccrual and restructured loans, are evaluated on an individual basis using the discounted present value of expected cash flows, the fair value of collateral, or the market value of the loan, and a specific allowance is recorded to reflect the appropriate net realizable value. Collateral dependent loans are evaluated for impairment based upon the fair value of the collateral. Charge-offs against the allowance for impaired loans are made when and to the extent amounts are deemed uncollectible.

     Performing loans that have been restructured to provide a reduction or deferral of interest or principal due to a weakening in the financial position of the borrower were $2.2 million at December 31, 2010, compared to $5.3 million at September 30, 2010.

     Excluding covered loans, performing loans considered potential problem loans, which are not included in the past due or nonaccrual categories but for which known information about possible credit problems cause management to be uncertain as to the continued ability of the borrowers to comply with the present loan repayment terms in future periods, amounted to $233.1 million at December 31, 2010, a decrease of $3.7 million from September 30, 2010 and $25.3 million from December 31, 2009. Potential problem loans are subject to continuing management attention and are considered by management in determining the level of the allowance for loan losses.

     Year-to-date Results:

     Summary: The $4.0 million increase in our net income available to common shareholders from 2009 was the result of an $8.6 million increase in net interest income driven by an improved net interest margin and a $3.6 million decrease in the provision for loan losses, offset in part by a $3.4 million decrease in noninterest income, a $2.8 million increase in noninterest expense, and a $2.1 million increase in income tax expense.

NASDAQ: OKSB
OKSBP

Southwest Bancorp Inc. Reports 45% Increase in Net Income Available to Common Shareholders

     Net Interest Income: Net interest income totaled $107.3 million for 2010, compared to $98.7 million for 2009, an increase of $8.6 million, or 9%. Year-to-date net interest margin was 3.67% for 2010, compared to 3.38% for 2009. Included in 2010 year-to-date net interest income was $1.0 million of net recoveries from the resolution of nonperforming loans and additional discount accretion on loans and the loss share receivable, offset in part by interest reversals on nonaccrual loans. Included in 2009 year-to-date net interest income was a recovery of $3.0 million in interest from the successful resolution of a nonperforming loan and additional discount accretion on loans and the loss share receivable. These net recoveries increased year-to-date interest margin by 3 basis points and 10 basis points for 2010 and 2009, respectively.

     Provision for Loan Losses and Net Charge-Offs: The provision for loan losses totaled $35.6 million for 2010, compared to $39.2 million for 2009. Net charge-offs totaled $32.7 million, or 1.29% of average portfolio loans as of December 31, 2010, compared to $16.5 million, or 0.63% of average portfolio loans as of December 31, 2009.

     Noninterest Income: Noninterest income totaled $18.6 million for 2010, compared to $21.9 million for 2009. The decrease in noninterest income was primarily the result of a $3.3 million one-time gain on the FDIC-assisted acquisition that was recorded in the prior year.

     Noninterest Expense: Noninterest expense totaled $63.6 million for 2010, compared to $60.9 million for 2009. The increase consisted of a $2.1 million increase in other real estate expense, a $1.7 million increase in other general and administrative expense, and a $0.6 million increase in personnel expense, offset in part by a $1.4 million decrease in provision for unfunded loan commitments and a $0.5 million decrease in occupancy expense.

     Fourth Quarter Results:

     Summary: Net income available to common shareholders was $3.3 million in the fourth quarter of 2010, compared to $2.8 million in the third quarter of 2010 and $2.5 million in the fourth quarter of 2009. The increase from the third quarter of 2010 was the result of a $4.7 million decrease in the provision for loan losses and a $0.5 million increase in net interest income, offset in part by a $2.2 million decrease in noninterest income, a $1.4 million increase in noninterest expense, and a $1.2 million increase in income taxes. The increase from the fourth quarter of 2009 was the result of a $3.4 million decrease in the provision for loan losses, offset in part by a $0.8 million increase in noninterest expense, a $0.6 million increase in income taxes, and a $0.4 million decrease in noninterest income.

     Net Interest Income: Net interest income totaled $27.0 million for the fourth quarter of 2010, compared to $26.5 million for the third quarter of 2010, an increase of $0.5 million, or 2%, and $27.8 million for the fourth quarter of 2009, a decrease of $0.8 million, or 3%. Net interest margin was 3.82% for the fourth quarter of 2010, compared to 3.63% for the third quarter of 2010 and 3.71% for the fourth quarter of 2009. Included in the fourth quarter of 2010 net interest margin was a net recovery of $0.5 million from the resolution of nonperforming loans and the quarterly adjustment of the discount accretion on loans and the loss share receivable. Included in the third quarter 2010 net interest margin was a net reduction of $0.3 million from the interest reversals on nonaccrual loans offset by the quarterly adjustment of the discount accretion on loans and the loss share receivable. Included in the fourth quarter 2009 net interest margin was a $1.0 million net adjustment of the discount accretion on loans and the loss share receivable. The net effects of these adjustments on net interest margin were a 7 basis point increase, a 5 basis point decrease, and a 13 basis point increase for the each quarter, respectively.

     Provision for Loan Losses and Net Charge-Offs: The provision for loan losses totaled $7.3 million for the fourth quarter of 2010, compared to $12.0 million for the third quarter of 2010 and $10.6 million for the fourth quarter of 2009. Net charge-offs totaled $14.5 million, or 2.35% (annualized) of average portfolio loans for the fourth quarter of 2010, compared to $6.6 million, or 1.05% (annualized) of average portfolio loans for the third quarter of 2010 and $6.0 million, or 0.89% (annualized) of average portfolio loans for the fourth quarter of 2009.

     Noninterest Income: Noninterest income totaled $4.1 million for the fourth quarter of 2010, compared to $6.3 million for the third quarter of 2010 and $4.5 million for the fourth quarter of 2009. The decrease in noninterest income from the third quarter of 2010 was primarily the result of a $2.5 million decrease in gain on sale of securities, and the decrease from the fourth quarter of 2009 was primarily the result of a $0.3 million decrease in gain on sale of loans.

NASDAQ: OKSB
OKSBP

Southwest Bancorp Inc. Reports 45% Increase in Net Income Available to Common Shareholders

     Noninterest Expense: Noninterest expense totaled $16.8 million for the fourth quarter of 2010, compared to $15.4 million for the third quarter of 2010 and $16.0 million for the fourth quarter of 2009. The increase from third quarter 2010 consisted of a $1.0 million increase in other real estate expense and a $0.3 million increase in personnel expense. The increase from fourth quarter 2009 consisted of a $1.2 million increase in other real estate expense, offset in part by a $0.5 million decrease in the provision for unfunded loan commitments and $0.4 million decrease in occupancy expense.

Southwest Bancorp and Subsidiaries

     Southwest is the bank holding company for Stillwater National Bank and Trust Company (“Stillwater National”) and Bank of Kansas. Through its subsidiaries, Southwest offers commercial and consumer lending, deposit and investment services, specialized cash management, and other financial services from offices in Oklahoma, Texas, and Kansas, and on the Internet, through SNB DirectBanker^®. We were organized in 1981 as the holding company for Stillwater National, which was chartered in 1894. At December 31, 2010 we had total assets of $2.8 billion, deposits of $2.3 billion, and shareholders’ equity of $377.8 million.

     Our area of expertise focuses on the special financial needs of healthcare and health professionals, businesses and their managers and owners, and commercial and commercial real estate borrowers. We established a strategic focus on healthcare lending in 1974. We provide credit and other services, such as deposits, cash management, and document imaging for physicians and other healthcare practitioners to start or develop their practices and finance the development and purchase of medical offices, clinics, surgical care centers, hospitals, and similar facilities. As of December 31, 2010, approximately $713.7 million, or 30%, of our noncovered loans were loans to individuals and businesses in the healthcare industry.

     We also focus on commercial real estate mortgage and construction credits. We do not focus on one-to-four family residential development loans or “spec” residential property credits. Additionally, subprime lending has never been a part of our business strategy, and our exposure to subprime loans and subprime lenders is minimal. One-to-four family mortgages account for less than 5% of total noncovered loans. As of December 31, 2010 approximately $1.8 billion, or 74%, of our noncovered loans were commercial real estate mortgage and construction loans, including $412.6 million of loans to individuals and businesses in the healthcare industry. Our commercial real estate mortgage and construction and commercial loans are concentrated in states that have experienced less adverse effects from the recession than many others.

     We operate six offices in Texas, eleven offices in Oklahoma, and eight offices in Kansas. At December 31, 2010 our Texas segment accounted for $982.8 million, or 41% of total portfolio loans, followed by $871.4 million, or 37%, from our Oklahoma segment, $289.6 million, or 12%, from our Kansas segment, and $241.0 million, or 10%, from our other states segment.

     Southwest’s common stock is traded on the NASDAQ Global Select Market under the symbol OKSB. Southwest’s public trust preferred securities are traded on the NASDAQ Global Select Market under the symbol OKSBP.

Forward-Looking Statements

     This earnings release includes forward-looking statements that are subject to risks and uncertainties. These forward-looking statements include: statements of Southwest’s goals, intentions, and expectations; estimates of risks and of future costs and benefits; expectations regarding future financial performance of Southwest and its operating segments; assessments of loan quality, probable loan losses, and the amount and timing of loan payoffs; liquidity, contractual obligations, off-balance sheet risk, and interest rate risk; estimates of value of acquired assets, deposits, and other liabilities; and statements of Southwest’s ability to achieve financial and other goals. These forward-looking statements are subject to significant uncertainties, because they are based upon: the amount and timing of future changes in interest rates, market behavior, and other economic conditions; future laws and regulations and accounting principles; and a variety of other matters. Because of these uncertainties, the actual future results may be materially different from the results indicated by these forward-looking statements. In addition, Southwest’s past growth and performance do not necessarily indicate our future results.

NASDAQ: OKSB
OKSBP

Southwest Bancorp Inc. Reports 45% Increase in Net Income Available to Common Shareholders

     Southwest is required under generally accepted accounting principles to evaluate subsequent events and their impact, if any, on its financial statements as of December 31, 2010 through the date its financial statements are filed with the Securities and Exchange Commission. The December 31, 2010 financial statements will be adjusted if necessary to properly reflect the impact of subsequent events on estimates used to prepare those statements.

NASDAQ: OKSB
OKSBP

Southwest Bancorp Inc. Reports 45% Increase in Net Income Available to Common Shareholders

Financial Tables

Unaudited Financial Highlights		Table 1
Unaudited Consolidated Statements of Financial Condition		Table 2
Unaudited Consolidated Statements of Operations		Table 3
Unaudited Average Balances, Yields, and Rates-Quarterly		Table 4
Unaudited Average Balances, Yields, and Rates-Year-to-date		Table 5
Unaudited Quarterly Summary Financial Data		Table 6
Unaudited Quarterly Supplemental Analytical Data		Table 7

SOUTHWEST BANCORP, INC. UNAUDITED FINANCIAL HIGHLIGHTS (Dollars in thousands except per share)		Table 1

		Fourth Quarter												Third Quarter
										%								%
QUARTERLY HIGHLIGHTS		2010				2009				Change				2010				Change
Operations
Net interest income		$	26,970			$	27,797				(3	)%		$	26,452				2	%
Provision for loan losses			7,265				10,640				(32	)			11,988				(39	)
Noninterest income			4,089				4,488				(9	)			6,335				(35	)
Noninterest expense			16,811				16,041				5				15,418				9
Income before taxes			6,983				5,604				25				5,381				30
Taxes on income			2,675				2,030				32				1,508				77
Net income			4,308				3,574				21				3,873				11
Net income available to common shareholders			3,257				2,534				29				2,825				15
Diluted earnings per share			0.17				0.17				—				0.15				13
Balance Sheet
Total assets			2,820,541				3,108,291				(9	)			2,905,275				(3	)
Loans held for sale			35,194				43,134				(18	)			34,868				1
Noncovered portfolio loans			2,331,293				2,539,294				(8	)			2,412,796				(3	)
Covered portfolio loans			53,628				85,405				(37	)			60,558				(11	)
Total deposits			2,252,728				2,592,730				(13	)			2,345,648				(4	)
Total shareholders’ equity			377,812				309,778				22				376,576				—
Book value per common share			15.97				16.46				(3	)			15.93				—
Key Ratios
Net interest margin			3.82	%			3.71	%							3.63	%
Efficiency ratio			54.13				46.69								47.02
Total capital to risk-weighted assets			19.06				14.55								18.45
Nonperforming loans to portfolio loans — noncovered			4.59				4.18								5.62
Shareholders’ equity to total assets			13.40				9.97								12.96
Tangible common equity to tangible assets*			10.78				7.61								10.43
Return on average assets (annualized)			0.59				0.46								0.52
Return on average common equity (annualized)			4.11				4.06								3.57
Return on average tangible common equity (annualized)**			4.21				4.17								3.65

		Twelve Months
										%
YEAR-TO-DATE HIGHLIGHTS		2010				2009				Change
Operations
Net interest income		$	107,331			$	98,691				9	%
Provision for loan losses			35,560				39,176				(9	)
Noninterest income			18,564				21,936				(15	)
Noninterest expense			63,633				60,858				5
Income before taxes			26,702				20,593				30
Taxes on income			9,738				7,611				28
Net income			16,964				12,982				31
Net income available to common shareholders			12,777				8,837				45
Diluted earnings per share			0.71				0.60				18
Balance Sheet
Total assets			2,820,541				3,108,291				(9	)
Loans held for sale			35,194				43,134				(18	)
Noncovered portfolio loans			2,331,293				2,539,294				(8	)
Covered portfolio loans			53,628				85,405				(37	)
Total deposits			2,252,728				2,592,730				(13	)
Total shareholders’ equity			377,812				309,778				22
Book value per common share			15.97				16.46				(3	)
Key Ratios
Net interest margin			3.67	%			3.38	%
Efficiency ratio (GAAP-based)			50.54				50.45
Total capital to risk-weighted assets			19.06				14.55
Nonperforming loans to portfolio loans — noncovered			4.59				4.18
Shareholders’ equity to total assets			13.40				9.97
Tangible common equity to tangible assets*			10.78				7.61
Return on average assets			0.57				0.43
Return on average common equity			4.37				3.65
Return on average tangible common equity**			4.48				3.76

Balance sheet amounts and ratios are as of period end unless otherwise noted.

Please see accompanying tables for additional financial information.

SOUTHWEST BANCORP, INC.		Table 2
UNAUDITED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION
(Dollars in thousands, except per share)

		December 31,				December 31,
		2010				2009
Assets
Cash and cash equivalents		$	67,496			$	118,847
Investment securities:
Held to maturity. Fair value: $14,029, $6,754, respectively			14,304				6,670
Available for sale. Amortized cost: $246,649, $236,199, respectively			248,221				237,703
Other investments, at cost			10,404				19,066
Loans held for sale			35,194				43,134
Noncovered loans receivable			2,331,293				2,539,294
Less: Allowance for loan losses			(65,229	)			(62,413	)
Net noncovered loans receivable			2,266,064				2,476,881
Covered loans receivable (includes loss share: $14.4 million, $23.9 million, respectively)			53,628				85,405
Net loans receivable			2,319,692				2,562,286
Accrued interest receivable			8,590				10,806
Premises and equipment, net			23,772				26,536
Noncovered other real estate			37,722				18,432
Covered other real estate			4,187				4,748
Goodwill			6,811				6,811
Other intangible assets, net			5,371				5,779
Other assets			38,777				47,473
Total assets		$	2,820,541			$	3,108,291
Liabilities
Deposits:
Noninterest-bearing demand		$	377,182			$	324,829
Interest-bearing demand			92,584				74,201
Money market accounts			495,253				505,521
Savings accounts			26,665				25,730
Time deposits of $100,000 or more			694,565				1,004,439
Other time deposits			566,479				658,010
Total deposits			2,252,728				2,592,730
Accrued interest payable			1,577				3,191
Income tax payable			2,878				4,486
Other liabilities			8,981				13,121
Other borrowings			94,602				103,022
Subordinated debentures			81,963				81,963
Total liabilities			2,442,729				2,798,513
Shareholders’ equity
Serial preferred stock; 2,000,000 shares authorized; 70,000 shares issued and outstanding			67,724				67,037
Common stock — $1 par value; 40,000,000 shares authorized; 19,421,900, 14,750,713, shares issued and outstanding, respectively			19,422				14,751
Additional paid-in capital			98,894				49,029
Retained earnings			190,793				178,016
Accumulated other comprehensive income			979				945
Total shareholders’ equity			377,812				309,778
Total liabilities and shareholders’ equity		$	2,820,541			$	3,108,291

SOUTHWEST BANCORP, INC.		Table 3
UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS
(Dollars in thousands except per share)

		For the three months								For the twelve months
		ended December 31,								ended December 31,
		2010				2009				2010				2009
Interest income
Loans		$	32,831			$	36,355			$	133,918			$	141,239
Investment securities			1,816				2,433				8,660				9,146
Other interest-earning assets			39				1				229				14
Total interest income			34,686				38,789				142,807				150,399
Interest expense
Interest-bearing deposits			5,920				9,090				28,267				42,319
Other borrowings			514				625				2,079				4,049
Subordinated debentures			1,282				1,277				5,130				5,340
Total interest expense			7,716				10,992				35,476				51,708
Net interest income			26,970				27,797				107,331				98,691
Provision for loan losses			7,265				10,640				35,560				39,176
Net interest income after provision for loan losses			19,705				17,157				71,771				59,515
Noninterest income
Service charges and fees			3,144				3,295				12,404				11,704
Gain on acquisition			—				—				—				3,281
Gain on sales of loans			682				933				2,736				2,963
Gain on investment securities			15				3				2,661				2,925
Other noninterest income			248				257				763				1,063
Total noninterest income			4,089				4,488				18,564				21,936
Noninterest expense
Salaries and employee benefits			7,516				7,349				29,916				29,299
Occupancy			2,717				3,159				11,171				11,637
FDIC and other insurance			1,333				1,101				5,788				5,545
Other real estate, net			1,255				39				2,218				130
General and administrative			3,990				4,393				14,540				14,247
Total noninterest expense			16,811				16,041				63,633				60,858
Income before taxes			6,983				5,604				26,702				20,593
Taxes on income			2,675				2,030				9,738				7,611
Net income		$	4,308			$	3,574			$	16,964			$	12,982
Net income available to common shareholders		$	3,257			$	2,534			$	12,777			$	8,837
Basic earnings per common share		$	0.17			$	0.17			$	0.71			$	0.60
Diluted earnings per common share			0.17				0.17				0.71				0.60
Common dividends declared per share			—				0.0238				—				0.0952

SOUTHWEST BANCORP, INC.		Table 4
UNAUDITED AVERAGE BALANCES, YIELDS, AND RATES — QUARTERLY
(Dollars in thousands)

		For the three months ended December 31,
		2010												2009
		Average								Average				Average								Average
		Balance				Interest				Yield/Rate				Balance				Interest				Yield/Rate
Assets
Noncovered loans		$	2,417,584			$	31,933				5.24	%		$	2,613,741			$	34,881				5.29	%
Covered loans			58,755				898				6.06				91,459				1,474				6.39
Investment securities			264,053				1,816				2.73				264,216				2,433				3.65
Other interest-earning assets			61,249				39				0.25				5,624				1				0.07
Total interest-earning assets			2,801,641				34,686				4.91				2,975,040				38,789				5.17
Other assets			81,735												74,889
Total assets		$	2,883,376											$	3,049,929
Liabilities and Shareholders’ Equity
Interest-bearing demand deposits		$	85,967			$	85				0.39	%		$	75,614			$	66				0.35	%
Money market accounts			508,110				885				0.69				502,247				1,170				0.92
Savings accounts			25,885				17				0.26				25,388				16				0.25
Time deposits			1,316,536				4,933				1.49				1,585,240				7,838				1.96
Total interest-bearing deposits			1,936,498				5,920				1.21				2,188,489				9,090				1.65
Other borrowings			96,267				514				2.12				127,378				625				1.95
Subordinated debentures			81,963				1,282				6.26				81,963				1,277				6.23
Total interest-bearing liabilities			2,114,728				7,716				1.45				2,397,830				10,992				1.82
Noninterest-bearing demand deposits			367,761												316,784
Other liabilities			19,252												20,751
Shareholders’ equity			381,635												314,564
Total liabilities and shareholders’ equity		$	2,883,376											$	3,049,929
Net interest income and spread						$	26,970				3.46	%						$	27,797				3.35	%
Net interest margin (1)											3.82	%											3.71	%
Average interest-earning assets to average interest-bearing liabilities			132.48	%											124.07	%

SOUTHWEST BANCORP, INC.		Table 5
UNAUDITED AVERAGE BALANCES, YIELDS, AND RATES - YEAR-TO-DATE
(Dollars in thousands)

		For the twelve months ended December 31,
		2010												2009
		Average								Average				Average								Average
		Balance				Interest				Yield/Rate				Balance				Interest				Yield/Rate
Assets
Loans (1)		$	2,573,442			$	133,918				5.20	%		$	2,667,771			$	141,239				5.29	%
Investment securities			261,124				8,660				3.32				245,456				9,146				3.73
Other interest-earning assets			88,079				229				0.26				5,813				14				0.24
Total interest-earning assets			2,922,645				142,807				4.89				2,919,040				150,399				5.15
Other assets			76,099												68,430
Total assets		$	2,998,744											$	2,987,470
Liabilities and Shareholders’ Equity
Interest-bearing demand deposits		$	98,589			$	468				0.47	%		$	83,813			$	476				0.57	%
Money market accounts			508,583				3,911				0.77				485,383				4,954				1.02
Savings accounts			25,609				64				0.25				21,010				78				0.37
Time deposits			1,479,287				23,824				1.61				1,518,638				36,811				2.42
Total interest-bearing deposits			2,112,068				28,267				1.34				2,108,844				42,319				2.01
Other borrowings			96,141				2,079				2.16				181,682				4,049				2.23
Subordinated debentures			81,963				5,130				6.26				81,963				5,340				6.52
Total interest-bearing liabilities			2,290,172				35,476				1.55				2,372,489				51,708				2.18
Noninterest-bearing demand deposits			330,998												285,184
Other liabilities			18,039												20,845
Shareholders’ equity			359,535												308,952
Total liabilities and shareholders’ equity		$	2,998,744											$	2,987,470
Net interest income and spread						$	107,331				3.34	%						$	98,691				2.97	%
Net interest margin (2)											3.67	%											3.38	%
Average interest-earning assets to average interest-bearing liabilities			127.62	%											123.04	%

SOUTHWEST BANCORP, INC.		Table 6
UNAUDITED QUARTERLY SUMMARY FINANCIAL DATA
(Dollars in thousands except per share)

		2010																2009
		Dec. 31				Sep. 30				Jun. 30				Mar. 31				Dec. 31				Sep. 30				Jun. 30				Mar. 31
OPERATIONS
Interest income:
Loans		$	32,831			$	32,824			$	33,891			$	34,372			$	36,355			$	35,607			$	36,009			$	33,268
Investment securities			1,816				2,204				2,320				2,320				2,433				2,122				2,079				2,512
Other interest-earning assets			39				55				68				67				1				4				3				6
Total interest income			34,686				35,083				36,279				36,759				38,789				37,733				38,091				35,786
Interest expense:
Interest bearing demand deposits			85				111				140				132				66				107				150				153
Money market accounts			885				976				1,037				1,013				1,170				1,220				1,211				1,353
Savings accounts			17				15				16				16				16				39				14				9
Time deposits of $100,000 or more			1,881				3,128				3,517				4,024				4,340				4,822				5,552				5,980
Other time deposits			3,052				2,572				2,661				2,989				3,498				3,909				4,145				4,565
Total interest-bearing deposits			5,920				6,802				7,371				8,174				9,090				10,097				11,072				12,060
Other borrowings			514				524				524				517				625				960				1,180				1,284
Subordinated debentures			1,282				1,305				1,276				1,267				1,277				1,276				1,383				1,404
Total interest expense			7,716				8,631				9,171				9,958				10,992				12,333				13,635				14,748
Net interest income			26,970				26,452				27,108				26,801				27,797				25,400				24,456				21,038
Provision for loan losses			7,265				11,988				7,776				8,531				10,640				10,177				7,477				10,882
Noninterest income:
Service charges and fees			3,144				2,994				3,170				3,096				3,295				2,992				2,817				2,600
Gain on sales of loans			682				653				416				985				933				386				926				718
Gain (loss) on investment securities			15				2,480				34				7				3				10				(9	)			2,921
Other noninterest income			248				208				342				90				257				322				3,527				238
Total noninterest income			4,089				6,335				3,962				4,178				4,488				3,710				7,261				6,477
Noninterest expense:
Salaries and employee benefits			7,516				7,183				7,637				7,580				7,349				7,824				6,887				7,239
Occupancy			2,717				2,835				2,836				2,783				3,159				2,958				2,789				2,731
FDIC and other insurance			1,333				1,347				1,521				1,587				1,101				1,134				2,319				991
Other real estate, net			1,255				228				629				106				39				90				103				(102	)
Provision for unfunded loan commitments			(332	)			(294	)			(512	)			(465	)			147				(79	)			(388	)			90
Other general and administrative			4,322				4,119				4,035				3,667				4,246				3,601				2,980				3,650
Total noninterest expense			16,811				15,418				16,146				15,258				16,041				15,528				14,690				14,599
Income before taxes			6,983				5,381				7,148				7,190				5,604				3,405				9,550				2,034
Taxes on income			2,675				1,508				2,737				2,818				2,030				1,271				3,605				705
Net income		$	4,308			$	3,873			$	4,411			$	4,372			$	3,574			$	2,134			$	5,945			$	1,329
Net income available to common shareholders		$	3,257			$	2,825			$	3,366			$	3,329			$	2,534			$	1,097			$	4,910			$	296
PER SHARE DATA
Basic earnings per common share		$	0.17			$	0.15			$	0.19			$	0.23			$	0.17			$	0.07			$	0.34			$	0.02
Diluted earnings per common share			0.17				0.15				0.19				0.23				0.17				0.07				0.33				0.02
Common dividends declared per share			—				—				—				—				0.02				0.02				0.02				0.02
Book value per common share			15.96				15.93				15.88				16.79				16.46				16.43				16.30				16.01
Tangible book value per share*			15.61				15.58				15.53				16.33				15.99				15.96				15.84				15.52
COMMON STOCK
Shares issued			19,421,900				19,395,675				19,388,797				14,779,711				14,750,713				14,748,223				14,658,042				14,658,042
Less treasury shares			—				—				—				—				—				—				(15,602	)			(49,930	)
Outstanding shares			19,421,900				19,395,675				19,388,797				14,779,711				14,750,713				14,748,223				14,642,440				14,608,112
OTHER FINANCIAL DATA
Investment securities		$	272,929			$	251,233			$	265,895			$	260,837			$	263,439			$	258,790			$	243,077			$	179,006
Loans held for sale			35,194				34,868				25,615				25,586				43,134				36,526				26,006				76,404
Noncovered portfolio loans			2,331,293				2,412,796				2,475,348				2,516,397				2,539,294				2,572,111				2,587,230				2,526,293
Total noncovered loans			2,366,487				2,447,664				2,500,963				2,541,983				2,582,428				2,608,637				2,613,236				2,602,697
Covered portfolio loans			53,628				60,558				68,006				76,909				85,405				103,630				117,096				—
Total assets			2,820,541				2,905,275				3,010,835				3,074,923				3,108,291				3,029,347				3,038,985				2,928,133
Total deposits			2,252,728				2,345,648				2,444,939				2,554,165				2,592,730				2,473,162				2,452,295				2,330,089
Other borrowings			94,602				82,506				93,036				103,620				103,022				146,449				176,368				193,739
Subordinated debentures			81,963				81,963				81,963				81,963				81,963				81,963				81,963				81,963
Total shareholders’ equity			377,812				376,576				375,319				315,341				309,778				309,118				305,416				300,406
Mortgage servicing portfolio			278,146				261,266				249,632				241,224				237,459				223,226				209,425				179,959
INTANGIBLE ASSET DATA
Goodwill		$	6,811			$	6,811			$	6,811			$	6,811			$	6,811			$	6,811			$	6,811			$	7,071
Core deposit intangible			3,557				3,693				3,830				3,967				4,103				4,240				4,378				2,498
Mortgage servicing rights			1,810				1,661				1,589				1,603				1,670				1,625				1,589				1,362
Nonmortgage servicing rights			4				4				5				5				6				7				7				8
Total intangible assets		$	12,182			$	12,169			$	12,235			$	12,386			$	12,590			$	12,683			$	12,785			$	10,939
Intangible amortization expense		$	402			$	392			$	350			$	359			$	381			$	344			$	391			$	204
Continued

SOUTHWEST BANCORP, INC.		Table 6
UNAUDITED QUARTERLY SUMMARY FINANCIAL DATA		Continued
(Dollars in thousands except per share)

		2010																2009
		Dec. 31				Sep. 30				Jun. 30				Mar. 31				Dec. 31				Sep. 30				Jun. 30				Mar. 31
LOAN COMPOSITION
Noncovered
Real estate mortgage:
Commercial		$	1,310,464			$	1,271,278			$	1,251,709			$	1,230,009			$	1,212,409			$	1,221,739			$	1,208,819			$	1,098,587
One-to-four family residential			89,800				109,980				106,814				111,185				114,614				125,034				116,068				114,111
Real estate construction
Commercial			441,265				527,773				589,590				630,472				618,078				612,905				622,298				640,132
One-to-four family residential			27,429				30,527				35,129				34,996				41,109				39,009				51,292				79,309
Commercial			452,626				463,132				471,004				487,074				520,505				538,757				554,734				558,834
Installment and consumer:
Guaranteed student loans			5,843				5,960				7,389				10,199				36,163				30,949				18,477				69,792
Other			39,060				39,014				39,328				38,048				39,550				40,244				41,548				41,932
Total noncovered loans, including held for sale			2,366,487				2,447,664				2,500,963				2,541,983				2,582,428				2,608,637				2,613,236				2,602,697
Less allowance for loan losses			(65,229	)			(72,418	)			(67,055	)			(65,168	)			(62,413	)			(57,777	)			(51,753	)			(46,262	)
Total noncovered loans, net		$	2,301,258			$	2,375,246			$	2,433,908			$	2,476,815			$	2,520,015			$	2,550,860			$	2,561,483			$	2,556,435
Covered
Real estate mortgage:
Commercial		$	30,997			$	33,428			$	36,107			$	37,487			$	39,836			$	37,820			$	40,411			$	—
One-to-four family residential			9,122				10,071				10,277				10,843				12,630				17,246				17,889				—
Real estate construction
Commercial			6,840				7,464				8,190				11,173				12,515				14,178				14,277				—
One-to-four family residential			439				1,823				3,853				5,273				5,324				9,936				13,647				—
Commercial			5,554				6,816				8,487				10,807				13,412				21,475				27,203				—
Installment and consumer:			676				956				1,092				1,326				1,688				2,975				3,669				—
Total covered loans		$	53,628			$	60,558			$	68,006			$	76,909			$	85,405			$	103,630			$	117,096			$	—
DEPOSIT COMPOSITION
Non-interest bearing demand		$	377,182			$	329,655			$	326,721			$	317,896			$	324,829			$	309,767			$	291,014			$	274,175
Interest-bearing demand			92,584				86,153				102,218				119,757				74,201				82,622				94,060				85,629
Money market accounts			495,253				518,422				510,549				506,659				505,521				506,196				483,162				467,924
Savings accounts			26,665				25,556				25,321				25,871				25,730				25,636				25,660				15,797
Time deposits of $100,000 or more			694,565				795,303				861,110				944,871				1,004,439				888,814				905,202				849,814
Other time deposits			566,479				590,559				619,020				639,111				658,010				660,127				653,197				636,750
Total deposits**		$	2,252,728			$	2,345,648			$	2,444,939			$	2,554,165			$	2,592,730			$	2,473,162			$	2,452,295			$	2,330,089
LOANS BY SEGMENT
Oklahoma banking		$	871,393			$	890,598			$	914,004			$	926,870			$	933,150			$	943,982			$	967,981			$	949,454
Texas banking			982,845				1,024,863				1,041,228				1,063,511				1,054,404				1,042,369				1,037,694				990,135
Kansas banking			289,642				309,240				329,157				342,596				359,633				400,710				412,314				309,774
Other states banking			241,041				248,653				258,965				260,329				277,512				288,680				286,337				276,930
Subtotal			2,384,921				2,473,354				2,543,354				2,593,306				2,624,699				2,675,741				2,704,326				2,526,293
Secondary market			35,194				34,868				25,615				25,586				43,134				36,526				26,006				76,404
Total loans		$	2,420,115			$	2,508,222			$	2,568,969			$	2,618,892			$	2,667,833			$	2,712,267			$	2,730,332			$	2,602,697
NET INCOME BY SEGMENT
Oklahoma banking		$	4,086			$	3,624			$	4,334			$	2,820			$	3,137			$	2,529			$	3,284			$	3,210
Texas banking			3,939				(1,769	)			697				1,656				3,255				2,686				3,662				1,119
Kansas banking			481				(227	)			985				(355	)			(1,399	)			(1,180	)			2,405				598
Other states banking			(3,661	)			488				(507	)			1,722				377				57				(78	)			(1,974	)
Subtotal			4,845				2,116				5,509				5,843				5,370				4,092				9,273				2,953
Secondary market			362				219				72				327				(3	)			(201	)			117				(61	)
Other operations			(899	)			1,538				(1,170	)			(1,798	)			(1,793	)			(1,757	)			(3,445	)			(1,563	)
Net income		$	4,308			$	3,873			$	4,411			$	4,372			$	3,574			$	2,134			$	5,945			$	1,329
OFFICES AND EMPLOYEES
FTE Employees			432				440				447				455				466				471				478				425
Branches			23				23				23				24				24				24				24				18
Loan production offices			2				2				2				2				3				3				3				3
Assets per employee		$	6,529			$	6,603			$	6,736			$	6,758			$	6,670			$	6,432			$	6,358			$	6,890