Exhibit 99

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

Southwest Bancorp Inc. Reports First Quarter 2011 Earnings

     April 19, 2011, Stillwater, Oklahoma . . . . Southwest Bancorp, Inc. (NASDAQ Global Select Market — OKSB, OKSBP), (“Southwest”), today reported net income available to common shareholders of $1.4 million, or $0.07 per diluted share for the first quarter of 2011, compared to $3.3 million, or $0.23 per diluted share for the first quarter of 2010, and $3.3 million, or $0.17 per diluted share for the fourth quarter of 2010.

     Rick Green, Southwest Bancorp’s President and Chief Executive Officer, stated, “Our first quarter of the new year continued to be profitable after a significant 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.

     Credits and Concentrations. 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. Our noncovered nonperforming assets were slightly up from year-end, primarily due to an increase in other real estate. The dollar amount of nonperforming loans was essentially unchanged from year-end. However, the composition has changed as our resolution process continues. We placed $26.5 million on nonaccrual, but returned $8.4 million to accrual status, charged-off $10.7 million, and received $2.8 million in resolutions and payments on nonperforming loans. At quarter-end our potential problem loans were $204.8 million, down $28.3 million, or 12%, from year-end, and $71.1 million, or 26%, from March 31, 2010. We believe that levels of nonperforming loans and potential problem loans are likely to fluctuate up and down as the process continues.

     Our noncovered loans decreased by $86.0 million, or 4%, from year-end and $261.5 million, or 10%, from March 31, 2010. This decrease allowed us to reduce our commercial real estate mortgage and construction concentration to $1.7 billion, or 75%, of noncovered loans at March 31, 2011. Our healthcare credits at quarter-end totaled $684.7 million, or 30%, of noncovered loans, including $414.3 million of healthcare related commercial real estate mortgage and construction loans. Nonperforming healthcare assets at quarter-end were $17.4 million, or 12%, of total nonperforming assets. Approximately 80% of our nonperforming assets are in Texas, Oklahoma, and Kansas.

     At March 31, 2011, the allowance for loan losses was 2.82% of noncovered portfolio loans, compared to 2.80% at year-end 2010 and 2.59% at March 31, 2010.

     The economy has not yet recovered, but we are encouraged that the economies of 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 healthcare lending and carefully controlled real estate collateralized credits.

     Capital Base. Southwest and its banking subsidiaries have maintained capital levels that substantially exceed the minimums for regulatory “well-capitalized” status. At March 31, 2011, Southwest’s total regulatory capital was $478.7 million, for a total risk-based capital ratio of 19.77%, and Tier 1 capital was $447.8 million, for a Tier 1 risk-based capital ratio of 18.49%.

     Liquidity. During the first quarter, we continued to reduce our use of brokered deposits and other non-core funding.

     NASDAQ:OKSB
OKSBP

Southwest Bancorp Inc. Reports First Quarter 2011 Earnings

     Earnings. Earning for the first quarter were driven by stable net interest income and controlled noninterest expense, partially offset by an increase in the provision for loan losses and a decrease in gain on sale of loans. Our net interest margin of 3.78% for the quarter was down slightly from the fourth quarter of 2010, but increased 19 basis points over the first quarter of 2010. The decrease in net interest income from the fourth quarter of 2010 was due to a combination of both rate and volume changes, primarily related to loans, while the decrease from the first quarter of 2010 was due mainly to lower loan volume.

     Our efficiency ratio for the first quarter remained strong at 54.50%, helped by stable salaries and employee benefits and occupancy costs.”

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

Financial Overview

     Condition: Total assets were $2.8 billion and total loans were $2.3 billion at March 31, 2011, a decrease of 1% and 4%, respectively, from December 31, 2010.

     At March 31, 2011 the allowance for loan losses was $63.3 million, a decrease of 3% from December 31, 2010, and represented 2.82% of noncovered portfolio loans versus 2.80% at December 31, 2010. 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 $148.9 million and 6.52% of portfolio loans and other real estate as of March 31, 2011, up $4.1 million from December 31, 2010. A breakdown of noncovered portfolio loans and noncovered nonperforming assets at March 31, 2011 by type is shown in the following table:

		Noncovered				Noncovered				Percentage of
		portfolio				nonperforming				total noncovered
(dollars in thousands)		loans				assets				nonperforming assets
Real estate construction		$	416,868			$	56,523				37.96	%
Commercial real estate			1,287,123				30,988				20.81
Commercial			417,812				17,622				11.83
Residential real estate mortgages			84,809				2,672				1.80
Other consumer loans			36,493				27				0.02
Other real estate			—				41,067				27.58
Total		$	2,243,105			$	148,899				100.00	%

     Excluding covered loans, nonaccrual loans were $107.3 million as of March 31, 2011, an increase of $0.7 million, or less than 1%, from December 31, 2010, and an increase of $9.4 million, or 10%, from March 31, 2010. These loans are carried at their estimated collectible amounts and no longer accrue interest. Noncovered loans 90 days or more past due and still accruing were $0.5 million as of March 31, 2011. 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 both March 31, 2011 and December 31, 2010. Restructured nonperforming loans were $7.1 million at March 31, 2011, compared to $6.0 million at December 31, 2010.

     NASDAQ:OKSB
OKSBP

Southwest Bancorp Inc. Reports First Quarter 2011 Earnings

     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 $204.8 million at March 31, 2011, a decrease of $28.3 million from December 31, 2010 and $71.1 million from March 31, 2010. Potential problem loans are subject to continuing management attention and are considered by management in determining the level of the allowance for loan losses.

     On February 11, 2011, Southwest entered into a seven year interest rate swap agreement with the objective of converting the variable interest rate on a $25.0 million subordinated debenture to a fixed interest rate based upon our expectation of rising interest rates over the swap term. The swap agreement requires Southwest to pay a fixed rate of interest at 6.15% and receive a variable rate of interest equal to the three-month LIBOR plus 285 basis points, or 3.16% at March 31, 2011.

     First Quarter Results:

     Summary: Net income available to common shareholders was $1.4 million in the first quarter of 2011, compared to $3.3 million in the fourth quarter of 2010 and $3.3 million in the first quarter of 2010. The decrease from the fourth quarter of 2010 was the result of a $1.8 million increase in the provision for loan losses, a $1.5 million decrease in net interest income, and a $0.8 million decrease in noninterest income, offset in part by a $1.2 million decrease in noninterest expense and a $1.1 million decrease in income taxes. The decrease from the first quarter of 2010 was the result of a $1.4 million decrease in net interest income, a $0.9 million decrease in noninterest income, a $0.5 million increase in the provision for loan losses, and a $0.4 million increase in noninterest expense, offset in part by a $1.3 million decrease in income taxes.

     Net Interest Income: Net interest income totaled $25.4 million for the first quarter of 2011, compared to $27.0 million for the fourth quarter of 2010, a decrease of $1.5 million, or 6%, and $26.8 million for the first quarter of 2010, a decrease of $1.4 million, or 5%. Net interest margin was 3.78% for the first quarter of 2011, compared to 3.82% for the fourth quarter of 2010 and 3.59% for the first quarter of 2010. Included in the first quarter of 2011 net interest margin was a net recovery of $0.1 million from the quarterly adjustment of the discount accretion on loans and the loss share receivable offset by interest reversals on nonaccrual loans. Included in the fourth quarter 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 first quarter 2010 net interest margin was a net recovery of $0.4 million from the resolution of a nonperforming loan and the quarterly adjustment of the discount accretion on loans and the loss share receivable, offset by interest reversals on nonaccrual loans. The net effects of these adjustments on net interest margin were a 1 basis point increase, a 7 basis point increase, and a 5 basis point increase for each quarter, respectively.

     Provision for Loan Losses and Net Charge-Offs: The provision for loan losses totaled $9.1 million for the first quarter of 2011, compared to $7.3 million for the fourth quarter of 2010 and $8.5 million for the first quarter of 2010. Net charge-offs totaled $11.0 million, or 1.90% (annualized) of average portfolio loans for the first quarter of 2011, compared to $14.5 million, or 2.35% (annualized) of average portfolio loans for the fourth quarter of 2010 and $5.8 million, or 0.90% (annualized) of average portfolio loans for the first quarter of 2010.

     Noninterest Income: Noninterest income totaled $3.2 million for the first quarter of 2011, compared to $4.1 million for the fourth quarter of 2010 and $4.2 million for the first quarter of 2010. The decrease in noninterest income from the fourth quarter of 2010 was primarily the result of a $0.5 million decrease in gain on sale of loans, mainly from declined mortgage loan sales, and a $0.3 million decrease in service charges and fees. The decrease from the first quarter of 2010 was primarily the result of a $0.8 million decrease in gain on sale of loans, mainly from declined student loan sales, and a $0.2 million decrease in service charges and fees.

     Noninterest Expense: Noninterest expense totaled $15.6 million for the first quarter of 2011, compared to $16.8 million for the fourth quarter of 2010 and $15.3 million for the first quarter of 2010. The decrease from fourth quarter 2010 consisted of a $0.8 million decrease in other real estate expense and a $0.6 million decrease in other general and administrative expense, primarily from decreased legal fees related to other real estate and other loan costs. The increase from first quarter 2010 consisted of a $0.3 million increase in other real estate expense and a $0.4 million increase in the provision for unfunded loan commitments, offset in part by a $0.3 million decrease in FDIC and other insurance expense.

     NASDAQ:OKSB
OKSBP

Southwest Bancorp Inc. Reports First Quarter 2011 Earnings

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 March 31, 2011 we had total assets of $2.8 billion, deposits of $2.2 billion, and shareholders’ equity of $379.7 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 March 31, 2011, approximately $684.7 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 March 31, 2011 approximately $1.7 billion, or 75%, of our noncovered loans were commercial real estate mortgage and construction loans, including $414.3 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 March 31, 2011 our Texas segment accounted for $954.6 million, or 42% of total portfolio loans, followed by $838.5 million, or 36%, from our Oklahoma segment, $272.7 million, or 12%, from our Kansas segment, and $226.5 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.

     Southwest is required under generally accepted accounting principles to evaluate subsequent events and their impact, if any, on its financial statements as of March 31, 2011 through the date its financial statements are filed with the Securities and Exchange Commission. The March 31, 2011 financial statements included in this release 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 First Quarter 2011 Earnings

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 Quarterly Summary Financial Data		Table 5
Unaudited Quarterly Supplemental Analytical Data		Table 6

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

		First Quarter												Fourth Quarter
										%								%
QUARTERLY HIGHLIGHTS		2011				2010				Change				2010				Change
Operations
Net interest income		$	25,421			$	26,801				(5	)%		$	26,970				(6	)%
Provision for loan losses			9,050				8,531				6				7,265				25
Noninterest income			3,249				4,178				(22	)			4,089				(21	)
Noninterest expense			15,625				15,258				2				16,811				(7	)
Income before taxes			3,995				7,190				(44	)			6,983				(43	)
Taxes on income			1,534				2,818				(46	)			2,675				(43	)
Net income			2,461				4,372				(44	)			4,308				(43	)
Net income available to common shareholders			1,408				3,329				(58	)			3,257				(57	)
Diluted earnings per share			0.07				0.23				(70	)			0.17				(59	)
Balance Sheet
Total assets			2,778,833				3,074,923				(10	)			2,820,541				(1	)
Loans held for sale			37,348				25,586				46				35,194				6
Noncovered portfolio loans			2,243,105				2,516,397				(11	)			2,331,293				(4	)
Covered portfolio loans			49,117				76,909				(36	)			53,628				(8	)
Total deposits			2,218,571				2,554,165				(13	)			2,252,728				(2	)
Total shareholders’ equity			379,668				315,341				20				377,812				—
Book value per common share			16.04				16.79				(4	)			15.97				—
Key Ratios
Net interest margin			3.78	%			3.59	%							3.82	%
Efficiency ratio			54.50				49.25								54.13
Total capital to risk-weighted assets			19.77				15.28								19.06
Nonperforming loans to portfolio loans — noncovered			4.81				3.89								4.59
Shareholders’ equity to total assets			13.66				10.26								13.40
Tangible common equity to tangible assets*			11.00				7.87								10.78
Return on average assets (annualized)			0.35				0.57								0.59
Return on average common equity (annualized)			1.81				5.42								4.11
Return on average tangible common equity (annualized)**			1.85				5.58								4.21

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

		March 31,				December 31,				March 31,
		2011				2010				2010
Assets
Cash and due from banks		$	28,034			$	26,478			$	22,196
Interest-bearing deposits			89,529				41,018				124,129
Cash and cash equivalents			117,563				67,496				146,325
Securities held to maturity (fair values of $12,903, $14,029, $6,750, respectively)			13,042				14,304				6,670
Securities available for sale (amortized cost of $243,556, $246,649, $230,522, respectively)			245,394				248,221				235,023
Loans held for sale			37,348				35,194				25,586
Noncovered loans receivable			2,243,105				2,331,293				2,516,397
Less: Allowance for loan losses			(63,310	)			(65,229	)			(65,168	)
Net noncovered loans receivable			2,179,795				2,266,064				2,451,229
Covered loans receivable (includes loss share: $12,617, $14,370, and $21,060, respectively)			49,117				53,628				76,909
Net loans receivable			2,228,912				2,319,692				2,528,138
Accrued interest receivable			8,789				8,590				10,271
Premises and equipment, net			23,555				23,772				25,996
Noncovered other real estate			41,067				37,722				18,809
Covered other real estate			4,016				4,187				4,489
Goodwill			6,811				6,811				6,811
Other intangible assets, net			5,141				5,371				5,575
Other assets			47,195				49,181				61,230
Total assets		$	2,778,833			$	2,820,541			$	3,074,923
Liabilities
Deposits:
Noninterest-bearing demand		$	369,013			$	377,182			$	317,896
Interest-bearing demand			112,731				92,584				119,757
Money market accounts			486,770				495,253				506,659
Savings accounts			28,440				26,665				25,871
Time deposits of $100,000 or more			669,817				694,565				944,871
Other time deposits			551,800				566,479				639,111
Total deposits			2,218,571				2,252,728				2,554,165
Accrued interest payable			1,805				1,577				2,993
Income tax payable			3,510				2,878				6,761
Other liabilities			7,471				8,981				10,080
Other borrowings			85,332				94,602				103,620
Subordinated debentures			82,476				81,963				81,963
Total liabilities			2,399,165				2,442,729				2,759,582
Shareholders’ equity
Serial preferred stock; 2,000,000 shares authorized; 70,000 shares issued and outstanding			67,902				67,724				67,205
Common stock — $1 par value; 40,000,000 shares authorized; 19,438,290, 19,421,900, 14,779,711 shares issued and outstanding, respectively			19,438				19,422				14,780
Additional paid-in capital			98,994				98,894				49,229
Retained earnings			192,200				190,793				181,344
Accumulated other comprehensive income			1,134				979				2,783
Total shareholders’ equity			379,668				377,812				315,341
Total liabilities and shareholders’ equity		$	2,778,833			$	2,820,541			$	3,074,923

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

		For the three months
		ended March 31,
		2011				2010
Interest income
Loans		$	30,539			$	34,372
Investment securities			1,746				2,170
Other interest-earning assets			140				217
Total interest income			32,425				36,759
Interest expense
Interest-bearing deposits			5,133				8,174
Other borrowings			497				517
Subordinated debentures			1,374				1,267
Total interest expense			7,004				9,958
Net interest income			25,421				26,801
Provision for loan losses			9,050				8,531
Net interest income after provision for loan losses			16,371				18,270
Noninterest income
Service charges and fees			2,878				3,096
Gain on sales of loans			194				985
Gain on investment securities			—				7
Other noninterest income			177				90
Total noninterest income			3,249				4,178
Noninterest expense
Salaries and employee benefits			7,515				7,580
Occupancy			2,804				2,783
FDIC and other insurance			1,243				1,587
Other real estate, net			436				106
General and administrative			3,627				3,202
Total noninterest expense			15,625				15,258
Income before taxes			3,995				7,190
Taxes on income			1,534				2,818
Net income		$	2,461			$	4,372
Net income available to common shareholders		$	1,408			$	3,329
Basic earnings per common share		$	0.07			$	0.23
Diluted earnings per common share			0.07				0.23
Common dividends declared per share			—				—

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

		For the three months ended March 31,
		2011												2010
		Average								Average				Average								Average
		Balance				Interest				Yield/Rate				Balance				Interest				Yield/Rate
Assets
Noncovered loans		$	2,326,882			$	29,655				5.17	%		$	2,587,603			$	32,981				5.17	%
Covered loans			51,494				884				6.96				82,043				1,391				6.88
Investment securities			256,384				1,746				2.76				241,276				2,170				3.65
Other interest-earning assets			92,692				140				0.61				115,374				217				0.76
Total interest-earning assets			2,727,452				32,425				4.82				3,026,296				36,759				4.93
Other assets			91,807												79,238
Total assets		$	2,819,259											$	3,105,534
Liabilities and Shareholders’ Equity
Interest-bearing demand deposits		$	112,441			$	124				0.45	%		$	107,510			$	132				0.50	%
Money market accounts			491,306				677				0.56				504,486				1,013				0.81
Savings accounts			27,741				16				0.23				25,628				16				0.25
Time deposits			1,248,152				4,316				1.40				1,649,888				7,013				1.72
Total interest-bearing deposits			1,879,640				5,133				1.11				2,287,512				8,174				1.45
Other borrowings			90,198				497				2.23				97,297				517				2.15
Subordinated debentures			81,969				1,374				6.70				81,963				1,267				6.18
Total interest-bearing liabilities			2,051,807				7,004				1.38				2,466,772				9,958				1.64
Noninterest-bearing demand deposits			365,161												303,684
Other liabilities			19,789												19,032
Shareholders’ equity			382,502												316,046
Total liabilities and shareholders’ equity		$	2,819,259											$	3,105,534
Net interest income and spread						$	25,421				3.44	%						$	26,801				3.29	%
Net interest margin (1)											3.78	%											3.59	%
Average interest-earning assets to average interest-bearing liabilities			132.93	%											122.68	%

SOUTHWEST BANCORP, INC.		Table 5
UNAUDITED QUARTERLY SUMMARY FINANCIAL DATA
(Dollars in thousands, except per share)

		2011				2010
		Mar. 31				Dec. 31				Sep. 30				Jun. 30				Mar. 31
OPERATIONS
Interest income:
Loans		$	30,539			$	32,831			$	32,824			$	33,891			$	34,372
Investment securities			1,746				1,724				2,079				2,175				2,170
Other interest-earning assets			140				131				180				213				217
Total interest income			32,425				34,686				35,083				36,279				36,759
Interest expense:
Interest bearing demand deposits			124				85				111				140				132
Money market accounts			677				885				976				1,037				1,013
Savings accounts			16				17				15				16				16
Time deposits of $100,000 or more			2,349				2,703				3,128				3,517				4,024
Other time deposits			1,967				2,230				2,572				2,661				2,989
Total interest-bearing deposits			5,133				5,920				6,802				7,371				8,174
Other borrowings			497				514				524				524				517
Subordinated debentures			1,374				1,282				1,305				1,276				1,267
Total interest expense			7,004				7,716				8,631				9,171				9,958
Net interest income			25,421				26,970				26,452				27,108				26,801
Provision for loan losses			9,050				7,265				11,988				7,776				8,531
Noninterest income:
Service charges and fees			2,878				3,144				2,994				3,170				3,096
Gain on sales of loans			194				682				653				416				985
Gain on investment securities			—				15				2,605				34				7
Other noninterest income			177				248				83				342				90
Total noninterest income			3,249				4,089				6,335				3,962				4,178
Noninterest expense:
Salaries and employee benefits			7,515				7,516				7,183				7,637				7,580
Occupancy			2,804				2,717				2,835				2,836				2,783
FDIC and other insurance			1,243				1,333				1,347				1,521				1,587
Other real estate, net			436				1,255				228				629				106
Provision for unfunded loan commitments			(55	)			(332	)			(294	)			(512	)			(465	)
Other general and administrative			3,682				4,322				4,119				4,035				3,667
Total noninterest expense			15,625				16,811				15,418				16,146				15,258
Income before taxes			3,995				6,983				5,381				7,148				7,190
Taxes on income			1,534				2,675				1,508				2,737				2,818
Net income		$	2,461			$	4,308			$	3,873			$	4,411			$	4,372
Net income available to common shareholders		$	1,408			$	3,257			$	2,825			$	3,366			$	3,329
PER SHARE DATA
Basic earnings per common share		$	0.07			$	0.17			$	0.15			$	0.19			$	0.23
Diluted earnings per common share			0.07				0.17				0.15				0.19				0.23
Book value per common share			16.04				15.97				15.93				15.88				16.79
Tangible book value per share*			15.69				15.62				15.58				15.53				16.33
COMMON STOCK
Shares issued and outstanding			19,438,290				19,421,900				19,395,675				19,388,797				14,779,711
OTHER FINANCIAL DATA
Investment securities		$	258,436			$	262,525			$	240,844			$	247,108			$	241,693
Loans held for sale			37,348				35,194				34,868				25,615				25,586
Noncovered portfolio loans			2,243,105				2,331,293				2,412,796				2,475,348				2,516,397
Total noncovered loans			2,280,453				2,366,487				2,447,664				2,500,963				2,541,983
Covered portfolio loans			49,117				53,628				60,558				68,006				76,909
Total assets			2,778,833				2,820,541				2,905,275				3,010,835				3,074,923
Total deposits			2,218,571				2,252,728				2,345,648				2,444,939				2,554,165
Other borrowings			85,332				94,602				82,506				93,036				103,620
Subordinated debentures			82,476				81,963				81,963				81,963				81,963
Total shareholders’ equity			379,668				377,812				376,576				375,319				315,341
Mortgage servicing portfolio			281,271				278,146				261,266				249,632				241,224
INTANGIBLE ASSET DATA
Goodwill		$	6,811			$	6,811			$	6,811			$	6,811			$	6,811
Core deposit intangible			3,420				3,557				3,693				3,830				3,967
Mortgage servicing rights			1,718				1,810				1,661				1,589				1,603
Nonmortgage servicing rights			3				4				4				5				5
Total intangible assets		$	11,952			$	12,182			$	12,169			$	12,235			$	12,386
Intangible amortization expense		$	361			$	402			$	392			$	350			$	359

Continued

SOUTHWEST BANCORP, INC.		Table 5
UNAUDITED QUARTERLY SUMMARY FINANCIAL DATA		Continued
(Dollars in thousands, except per share)

		2011				2010
		Mar. 31				Dec. 31				Sep. 30				Jun. 30				Mar. 31
LOAN COMPOSITION
Noncovered
Real estate mortgage:
Commercial		$	1,302,254			$	1,310,464			$	1,271,278			$	1,251,709			$	1,230,009
One-to-four family residential			87,324				89,800				109,980				106,814				111,185
Real estate construction
Commercial			403,954				441,265				527,773				589,590				630,472
One-to-four family residential			26,758				27,429				30,527				35,129				34,996
Commercial			417,970				452,626				463,132				471,004				487,074
Installment and consumer:
Guaranteed student loans			5,700				5,843				5,960				7,389				10,199
Other			36,493				39,060				39,014				39,328				38,048
Total noncovered loans, including held for sale			2,280,453				2,366,487				2,447,664				2,500,963				2,541,983
Less allowance for loan losses			(63,310	)			(65,229	)			(72,418	)			(67,055	)			(65,168	)
Total noncovered loans, net		$	2,217,143			$	2,301,258			$	2,375,246			$	2,433,908			$	2,476,815
Covered
Real estate mortgage:
Commercial		$	28,929			$	30,997			$	33,428			$	36,107			$	37,487
One-to-four family residential			8,192				9,122				10,071				10,277				10,843
Real estate construction
Commercial			6,144				6,840				7,464				8,190				11,173
One-to-four family residential			281				439				1,823				3,853				5,273
Commercial			5,021				5,554				6,816				8,487				10,807
Installment and consumer:			550				676				956				1,092				1,326
Total covered loans		$	49,117			$	53,628			$	60,558			$	68,006			$	76,909
DEPOSIT COMPOSITION
Non-interest bearing demand		$	369,013			$	377,182			$	329,655			$	326,721			$	317,896
Interest-bearing demand			112,731				92,584				86,153				102,218				119,757
Money market accounts			486,770				495,253				518,422				510,549				506,659
Savings accounts			28,440				26,665				25,556				25,321				25,871
Time deposits of $100,000 or more			669,817				694,565				795,303				861,110				944,871
Other time deposits			551,800				566,479				590,559				619,020				639,111
Total deposits**		$	2,218,571			$	2,252,728			$	2,345,648			$	2,444,939			$	2,554,165
LOANS BY SEGMENT
Oklahoma banking		$	838,464			$	871,393			$	890,598			$	914,004			$	926,870
Texas banking			954,584				982,845				1,024,863				1,041,228				1,063,511
Kansas banking			272,685				289,642				309,240				329,157				342,596
Other states banking			226,489				241,041				248,653				258,965				260,329
Subtotal			2,292,222				2,384,921				2,473,354				2,543,354				2,593,306
Secondary market			37,348				35,194				34,868				25,615				25,586
Total loans		$	2,329,570			$	2,420,115			$	2,508,222			$	2,568,969			$	2,618,892
NET INCOME BY SEGMENT
Oklahoma banking		$	3,435			$	4,205			$	3,399			$	4,387			$	2,857
Texas banking			1,079				4,001				(1,801	)			757				1,685
Kansas banking			131				293				(306	)			940				(322	)
Other states banking			(924	)			(3,674	)			494				(477	)			1,750
Subtotal			3,721				4,825				1,786				5,607				5,970
Secondary market			(13	)			444				173				83				310
Other operations			(1,247	)			(961	)			1,914				(1,279	)			(1,908	)
Net income		$	2,461			$	4,308			$	3,873			$	4,411			$	4,372
OFFICES AND EMPLOYEES
FTE Employees			424				432				440				447				455
Branches			23				23				23				23				24
Loan production offices			2				2				2				2				2
Assets per employee		$	6,554			$	6,529			$	6,603			$	6,736			$	6,758

Total deposits		$	2,218,571			$	2,252,728			$	2,345,648			$	2,444,939			$	2,554,165
Less:
Brokered time deposits			122,124				145,240				226,238				279,027				359,571
Other brokered deposits			112,033				117,532				129,096				126,643				124,969
Non-brokered deposits		$	1,984,414			$	1,989,956			$	1,990,314			$	2,039,269			$	2,069,625
Plus:
Sweep repurchase agreements			27,214				26,492				22,211				22,700				33,192
Core funding		$	2,011,628			$	2,016,448			$	2,012,525			$	2,061,969			$	2,102,817

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

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

		2011				2010
		Mar. 31				Dec. 31				Sep. 30				Jun. 30				Mar. 31
PERFORMANCE RATIOS
Return on average assets (annualized)			0.35	%			0.59	%			0.52	%			0.58	%			0.57	%
Return on average common equity (annualized)			1.81				4.11				3.57				4.64				5.42
Return on average tangible common equity (annualized)*			1.85				4.21				3.65				4.75				5.58
Net interest margin (annualized)			3.78				3.82				3.63				3.65				3.59
Total dividends declared to net income			35.56				20.31				22.59				19.84				20.02
Effective tax rate			38.40				38.31				28.02				38.29				39.19
Efficiency ratio			54.50				54.13				47.02				51.97				49.25
NONPERFORMING ASSETS
Noncovered
Nonaccrual loans		$	107,303			$	106,566			$	135,209			$	111,871			$	97,858
90 days past due and accruing			529				517				452				333				4
Total nonperforming loans			107,832				107,083				135,661				112,204				97,862
Other real estate			41,067				37,722				35,723				27,634				18,809
Total nonperforming assets		$	148,899			$	144,805			$	171,384			$	139,838			$	116,671
Performing restructured		$	2,166			$	2,177			$	5,334			$	5,525			$	5,650
Potential problem loans		$	204,834			$	233,140			$	236,844			$	242,217			$	275,912
Covered
Nonaccrual loans		$	9,809			$	10,806			$	7,906			$	14,504			$	16,192
90 days past due and accruing			—				—				1,871				130				356
Total nonperforming loans			9,809				10,806				9,777				14,634				16,548
Other real estate			4,016				4,187				4,448				4,352				4,489
Total nonperforming assets		$	13,825			$	14,993			$	14,225			$	18,986			$	21,037
Potential problem loans		$	3,444			$	3,495			$	6,413			$	6,184			$	6,620
ALLOWANCE ACTIVITY
Balance, beginning of period		$	65,229			$	72,418			$	67,055			$	65,168			$	62,413
Charge offs			11,367				14,720				7,006				6,168				6,545
Recoveries			398				266				381				279				769
Net charge offs			10,969				14,454				6,625				5,889				5,776
Provision for loan losses			9,050				7,265				11,988				7,776				8,531
Balance, end of period		$	63,310			$	65,229			$	72,418			$	67,055			$	65,168
ASSET QUALITY RATIOS
Net loan charge-offs to average portfolio loans (annualized)			1.90	%			2.35	%			1.05	%			0.92	%			0.90	%
Noncovered
Nonperforming assets to portfolio loans and other real estate			6.52	%			6.11	%			7.00	%			5.59	%			4.60	%
Nonperforming loans to portfolio loans			4.81				4.59				5.62				4.53				3.89
Allowance for loan losses to portfolio loans			2.82				2.80				3.00				2.71				2.59
Allowance for loan losses to nonperforming loans			58.71				60.91				53.38				59.76				66.59
Covered
Nonperforming assets to portfolio loans and other real estate			26.02	%			25.93	%			21.88	%			26.24	%			25.84	%
Nonperforming loans to portfolio loans			19.97				20.15				16.14				21.52				21.52
CAPITAL RATIOS
Average total shareholders’ equity to average assets			13.57	%			13.24	%			12.85	%			11.78	%			10.18	%
Leverage ratio			15.95				15.55				14.96				14.48				12.32
Tier 1 capital to risk-weighted assets			18.49				17.78				17.17				16.50				14.00
Total capital to risk-weighted assets			19.77				19.06				18.45				17.78				15.28
Tangible common equity to tangible assets***			11.00				10.78				10.43				10.02				7.87
REGULATORY CAPITAL DATA
Tier I capital		$	447,803			$	445,966			$	442,188			$	438,973			$	381,280
Total capital			478,736				477,930				475,040				472,971				415,955
Total risk adjusted assets			2,421,580				2,507,867				2,574,746				2,659,886				2,722,628
Average total assets			2,807,518				2,867,114				2,955,779				3,032,328				3,094,756