Columbia Banking System (COLB) 8-K Columbia Banking System Announces Increased Earnings

Exhibit 99.1

FOR IMMEDIATE RELEASE

February 4, 2011

Contacts:                    Melanie J. Dressel, President and

Chief Executive Officer

(253) 305-1911

Gary R. Schminkey, Executive Vice President

and Chief Financial Officer

(253) 305-1966

COLUMBIA BANKING SYSTEM ANNOUNCES INCREASED EARNINGS

FOR FOURTH QUARTER AND FULL YEAR 2010

Highlights

• Fourth quarter 2010: Net income of $12.6 million, or $0.32 per diluted common share, compared to net income applicable to common shareholders of $447 thousand, or $0.02 per diluted common share, for 4^th quarter 2009

• Full year 2010: Net income applicable to common shareholders of $25.8 million, or $0.72 per diluted common share, compared to a net loss of $8.4. million for the year 2009, or $0.38 per diluted common share for full year 2009

• Maintains very strong capital and liquidity measures

• Exceptional core deposits at 90% of total deposits

• Branch network of 84 branches in Washington and Oregon, up 62% from year-end 2009.

• Recognized as one of Washington’s Best Workplaces for 2010 by both thePuget Sound Business Journal and Seattle Business Magazine

TACOMA, Washington, February 4, 2011— Columbia Banking System, Inc. (NASDAQ: COLB) (“Columbia”) today announced net income of $12.6 million for the quarter ended December 31, 2010, compared to net income applicable to common shareholders of $447 thousand for the same quarter of 2009. On a diluted earnings per common share basis, net income was $0.32 for the fourth quarter compared with net income of $0.02 per share a year earlier. These results were achieved while the Company added $3.8 million to the provision for loan losses, excluding covered loans, for the quarter ended December 31, 2010, compared to $15.0 million for the fourth quarter of 2009. During the fourth quarter, the Company recorded $5.6 million in provision expense on its acquired loan portfolios.

Net income applicable to common shareholders for the year ended December 31, 2010 was $25.8 million, compared to a net loss of $8.4 million for 2009. On a diluted per common share basis, net income for

2010 was $0.72 compared with a net loss of $0.38 a year earlier.Earnings for the year 2010 were impacted by conversion expenses due to the two FDIC-assisted acquisitions, which closed during the first quarter of 2010. Including temporary help and vendor-related costs, conversion expenses recognized in 2010 were approximately $1.9 million.

Due to the repayment of the Capital Purchase Program funds in the third quarter, 2010, net income applicable to common shareholders for the fourth quarter 2010 and beyond does not include preferred dividends paid to the United States Treasury.

“We are pleased with our improved results for the quarter and for the year,” said Melanie Dressel, President and Chief Executive Officer. “During the year, we achieved significant progress in our often-stated goal of being a Pacific Northwest regional community bank. Our total assets increased by about 33% as a result of the FDIC-assisted acquisitions of Columbia River Bank and American Marine Bank during the first quarter. These transactions extended our geographic footprint into eastern Oregon and eastern Washington, as well as the Olympic Peninsula in western Washington. Our deposit market share reflects that growth; we now rank 9^th in Washington and 12^th in Oregon.”

Ms. Dressel continued, “Value to our shareholders increased, as our stock price appreciated approximately 30% during 2010. Bolstering our already strong capital ratios, we raised net proceeds of $229 million through a public offering during the second quarter. We also repaid in full the funds we received in the 4^th quarter of 2008 as part of our participation in the U.S. Treasury’s Capital Purchase Program, and retired the related warrant.”

Ms. Dressel continued, “We believe our core strengths, ongoing dedication to our client-focused, community bank business model and our commitment to expanding our presence in the Pacific Northwest have positioned us well for further growth and profitability.”

Significant Influences on the Quarter Ended December 31, 2010

Net Interest Margin

Columbia’s net interest margin increased to 4.35% in the fourth quarter of 2010, up from 4.30% in the fourth quarter of 2009. The net interest margin in the fourth quarter was impacted due to accretion income on our acquired loan portfolios. The net interest margin was negatively impacted by interest reversals of $469

thousand related to loans moving to nonaccrual status during the quarter. The net interest margin for the fourth quarter, excluding the acquired loan accretion income and interest reversals, approximates the reported net interest margin.

For the full year 2010, Columbia’s net interest margin increased to 4.76% from 4.33% a year earlier.Interest reversals impacting the net interest margin for the year 2010 were $1.6 million. The net interest margin for the full year, prior to the acquired loan accretion income and interest reversals, was approximately 4.59%. Additionally, the net interest margin was negatively affected by larger levels of interest-earning cash invested at relatively low yields. The Company continues to seek attractive investment opportunities to reduce its level of overnight funds.

Liquidity

Columbia’s liquidity ratio of approximately 49% for the quarter translates into over $2.1 billion of available funding for our general operations and to meet the needs of our customers.

Balance Sheet

At December 31, 2010, Columbia’s total assets were $4.26 billion, an increase of 33% from $3.20 billion at December 31, 2009. Total shareholders’ equity at December 31, 2010 was $706.9 million, an increase of 34% from $528.1 million at December 31, 2009.

Loans not covered under the FDIC loss-sharing agreements (“noncovered loans”) were $1.92 billion at December 31, 2010, down 5% from $2.01 billion at December 31, 2009. The decrease was primarily centered in approximately $76 million in real estate loans and approximately $51 million in real estate construction loans. Offsetting these decreases was the increase in commercial business lending, which was up approximately $51 million for the year. The noncovered loan portfolio continues to be diversified, with the intent to mitigate risk by minimizing concentration in any one segment. The portfolio includes 42% commercial business loans, 5% total construction including commercial and residential, 3% one-to-four family residential real estate, and 9% consumer. Approximately 41% of the portfolio is commercial real estate, consisting of 59% income property and 41% owner occupied property. Net loans covered under the FDIC-loss sharing agreements (“covered loans”), which provide protection against credit risk, totaled $517.1 million at December 31, 2010.

Total deposits were $3.33 billion at December 31, 2010, an increase of 34% from $2.48 billion at December 31, 2009. Core deposits, defined as demand, savings, money market accounts and certificates of deposit under $100,000, totaled $3.0 billion at December 31, 2010, comprising 90% of total deposits. All

categories of core deposits increased during 2010, with the largest increases centered in demand and other non-interesting bearing accounts, up approximately $321 million, and money market accounts, up approximately $317 million for the year.

The table below illustrates growth in core deposits on a linked-quarter basis, showing an increase in core deposits from the first quarter of 2010, while total deposits have been impacted as consumers have shifted away from certificates of deposit.

Three Month Ended	Dec. 31, 2010				Sept. 30, 2010			June 30, 2010			March 30, 2010
Total Deposits		3,327,269		��	$	3,306,886		$	3,284,947		$	3,371,165
Core Deposits		2,998,482			$	2,934,451		$	2,831,319		$	2,856,186
Core Deposits as a % of total deposits		90	%			89	%		86	%		85	%

Asset Quality

At December 31, 2010, nonperforming assets were $126.7 million, compared to $121.1 million at September 30, 2010 and $129.5 million at December 31, 2009. The increase in nonperforming assets for the quarter was primarily centered in the commercial business portfolio, offset by a decrease in real estate construction. The balance of the noncovered loan portfolio remained stable for the quarter, with modest improvements in permanent commercial real estate.

The table below sets forth information with respect to our nonaccrual loans, restructured loans, total nonperforming loans and total nonperforming assets.

(in thousands)	December 31, 2010		September 30, 2010		December 31, 2009
Nonaccrual noncovered loans:
Commercial business	$	32,367	$	17,490	$	18,979
Real estate:
One-to-four family residential		2,996		3,063		1,860
Commercial and five or more family residential real estate		23,192		25,282		24,354
Total real estate		26,188		28,345		26,214
Real estate construction:
One-to-four family residential		18,004		25,653		47,653
Commercial and five or more family residential real estate		7,584		14,771		16,230
Total real estate construction		25,588		40,424		63,883
Consumer		5,020		5,147		1,355
Total nonaccrual loans		89,163		91,406		110,431
Restructured noncovered loans:
Commercial and five or more family residential real estate		5,747		5,777		—
One-to-four family residential construction		758		705		60
Total restructured noncovered loans		6,505		6,482		60
Total nonperforming noncovered loans		95,668		97,888		110,491
Noncovered real estate owned and other personal property owned		30,991		23,259		19,037
Total nonperforming noncovered assets	$	126,659	$	121,147	$	129,528

For the quarter ended December 31, 2010, net loan charge-offs were approximately $5.1 million, compared to $13.2 million for the same period a year ago, and $6.4 million during the third quarter of 2010. Net charge-offs were primarily centered in commercial business, residential construction and term commercial real estate loans. For the year ended December 31, 2010, net loan charge-offs were $33.8 million, compared to $52.8 million for the year 2009.

The following table provides an analysis of the Company’s allowance for noncovered loan and lease losses at the dates and the periods indicated.

	Three Months Ended December 31,
(in thousands)	2010			2009
Beginning balance	$	62,334		$	51,688
Charge-offs:
Commercial business		(3,452	)		(4,730	)
One-to-four family residential		(302	)		(175	)
Commercial and five or more family residential real estate		(1,215	)		(352	)
One-to-four family residential		(1,900	)		(5,963	)
Commercial and five or more family residential real estate		(28	)		(1,755	)
Consumer		(1,039	)		(1,217	)
Total charge-offs		(7,936	)		(14,191	)
Recoveries:
Commercial business		1,612			219
One-to-four family residential		0			0
Commercial and five or more family residential real estate		79			3
One-to-four family residential		191			742
Commercial and five or more family residential real estate		775			0
Consumer		147			18
Total recoveries		2,804			982
Net (charge-offs)/recoveries		(5,133	)		(13,210	)
Provision charged to expense		3,791			15,000
Ending balance	$	60,993		$	53,478
Total noncovered loans, net at end of period	$	1,915,754		$	2,008,884
Allowance for loan losses to period-end noncovered loans		3.18	%		2.66	%

For the fourth quarter 2010, the provision for noncovered loan losses was $3.8 million compared to $15.0 million for the same quarter last year, and $9.0 million for the prior quarter. The allowance for noncovered loan losses to noncovered period-end loans was 3.18% at December 31, 2010 compared to 2.66% and 3.22% at December 31, 2009 and September 30, 2010, respectively. During the quarter, the company also had a provision expense of $5.6 million on covered loans. Provision expense for covered loans is offset at 80% by an increase through noninterest income in the balance of the FDIC indemnification asset.

Noncovered past due loans were $10.6 million at December 31, 2010, or 0.55% of total non- covered loans compared to $12.8 million, or 0.66% of total noncovered loans, as of September 30, 2010 and $9.1 million, or 0.45% of total loans, as of December 31, 2009.

Ms. Dressel commented, “Although our nonperforming assets increased slightly during the fourth quarter, we see general improvement in our overall loan quality. At the end of December, 2010, our criticized and classified asset totals were at their lowest level since December 2008. In light of the continued uncertainties in the economy, we have increased the level of our allowance for loan losses relative to total loans.”

Fourth Quarter 2010 Operating Results

Net Interest Income

Net interest income for the fourth quarter of 2010 was $38.8 million, an increase of $9.0 million from $29.8 million for the fourth quarter 2009, primarily due to the impact of the addition of the two FDIC-assisted loan portfolios. For the year ended December 31, 2010, net interest income was $164.8 million, an increase of 43% from $115.4 million a year earlier.

Columbia’s net interest margin was 4.35 % for the fourth quarter 2010, up from 4.30% for the fourth quarter of 2009.On a quarterly basis, the net interest margin was 4.78% for the first quarter of 2010, 4.66% for the second quarter of 2010, and 5.24% in the third quarter of 2010. Interest reversals impacting the net interest margin for the fourth quarter 2010 were $469 thousand, representing approximately 5 basis points.

Average interest-earning assets increased 28%to $3.68 billion in the fourth quarter of 2010, from $2.87 billion in the fourth quarter of 2009. The yield on average interest-earning assets decreased 28 basis points to 4.84% in the fourth quarter of 2010,from 5.12% in the fourth quarter of 2009. During the same period, average interest-bearing liabilities increased to $2.63 billion from $2.04 billion last year. The cost of average interest-bearing liabilities decreased 47 basis points to 0.69% in the fourth quarter of 2010,compared with 1.16% in the fourth quarter of 2009.

For the year ending December 31, 2010, Columbia’s net interest margin increased to 4.76% from 4.33% a year earlier.Average interest-earning assets increased to $3.58 billion for the year 2010 from $2.78 billion for 2009.The yield on average interest-earning assets increased 3 basis points to 5.35% in 2010, from 5.32% in 2009. Average interest-bearing liabilities were $2.63 billion compared to $2.07 billion for 2009. The cost of average interest-bearing liabilities decreased 54 basis points to 0.80% in 2010, compared with 1.34% for 2009. Interest reversals impacting the net interest margin for 2010 were $1.6 million, representing approximately 4 basis points.

Noninterest income

Total noninterest income for the fourth quarter 2010 was $15.9 million, up from $8.5 million a year earlier. The increase is primarily due to a $6.0 million change in the indemnification asset for the quarter.

For the year ended December 31, 2010, noninterest income was $52.8 million, an increase of $23.1 million from $29.7 million in 2009. The increase in noninterest income was impacted by a change in the indemnification asset of $4.9 million.

The table below illustrates the effect on noninterest income for the change in the FDIC indemnification asset, and the gain on bank acquisition for the three months and full year ended December 31, 2010.

(in thousands)	Three Months Ended December 31, 2010			Twelve Months Ended December 31, 2010
Noninterest Income	$	15,888		$	52,781
Change in Indemnification Asset		(6,045	)		(4,908	)
Gain on Bank Acquisition					(9,818	)
As Adjusted	$	9,843		$	38,055

Noninterest expense

Noninterest expense for the fourth quarter of 2010 was $35.0 million, an increase of 53% from $22.8 million a year earlier. The addition of operating expenses for the two 2010 FDIC acquisitions was the primary reason for the increase, as well as costs of other real estate owned. In addition, regulatory premiums increased $517 thousand,or 49%, from the fourth quarter of 2009, resulting from increased FDIC assessment rates.Other real estate owned balances, excluding covered OREO, increased to $31.0 million at December 31, 2010, compared to $19.0 million at December 31, 2009, contributing to a $1.3 million increase in the cost of operating other real estate owned from December 31, 2009.

Capital

The Company’s total risk-based capital ratio at December 31, 2010 exceeded 24%, more than double the minimum of 10% required to be “well-capitalized” under applicable regulatory standards. Our excess capital over and above the 10% minimum was approximately $369 million at December 31, 2010. At the end of the year 2010, our tangible common equity to tangible assets ratio stood at 14.0%, unchanged from September 30, 2010, and up from 13.7% at June 30, 2010 and 11.4% at December 31, 2009.

On August 11, 2010, Columbia redeemed all 76,898 shares of Series A preferred stock, originally issued to the U.S. Department of the Treasury on November 21, 2008 for approximately $76.9 million in capital under its Capital Purchase Program (“CPP”). During the third quarter, the Company paid a total of $77.8 million to the Treasury, consisting of $76.9 million in principal and $918,504 in accrued and unpaid dividends. Additionally, on September 1, 2010, the Company repurchased the common stock warrant issued to the U.S. Treasury in conjunction with the CPP for $3.3 million. The warrant repurchase, along with the August redemption of the entire amount of Series A preferred stock, represents full repayment of all CPP obligations and cancellation of all equity interests in the Company held by the U.S. Treasury. Earnings available to common shareholders were reduced by $2.3 million by the repayment of the $76.9 million, representing the remaining unamortized discount on the preferred stock.

Organizational Update

Ms. Dressel said, “During the fourth quarter, we moved forward with our strategies designed to increase our market share and continued to expand our geographic footprint. We opened a full service branch in Salem, Oregon, our first branch in Marion County. In addition to taking advantage of the opportunity to reach new customers through an expanded footprint, our plans call for enhancing our presence in our current markets. We recently relocated our Redmond, Washington branch to a more convenient location, reflecting our long-term commitment to the community.”

“During 2010, we were once again gratified to receive recognition as one of the best places to work in Washington,” Ms. Dressel noted. “We were awarded second place in the Extra Large category in thePuget Sound Business Journal’s“Washington’s Best Workplaces 2010”, and third place in the large employer category bySeattle Business Magazine’s 100 Best Companies to Work for 2010.”

“While we expect the economic climate to be hampered by a slow recovery, we are optimistic about the opportunities ahead,” Ms. Dressel commented. “We will continue our initiatives to deploy our capital effectively and remain focused on expense control to ultimately achieve our target efficiency ratio. Our capital position enhances our ability to consider strategic acquisitions, focus on organic growth and continue to hire talented team members to further augment our market share.”

Conference Call

Columbia’s management will discuss the fourth quarter and full year 2010 results on a conference call scheduled for Friday, February 4, 2011 at 10:00 a.m.. PST (1:00 p.m. EST). Interested parties may listen to this discussion by calling 1-866-378-3802; Conference ID code #42219722.

A conference call replay will be available from approximately 11:00 a.m. PST on February 4, 2011 through 9:00 p.m. PST on February 11, 2011. The conference call replay can be accessed by dialing 1-800-642-1687 and entering Conference ID code #42219722.

Annual Meeting of Shareholders

Columbia Banking System’s Annual Meeting of Shareholders will be held at 1:00 PDT on April 27, 2011, at the William W. Philip Hall at the University of Washington Tacoma., 1900 Commerce Street, Tacoma, Washington 98402. The Hall is named in honor of William W. “Bill” Philip, who had a seminal role in establishing UW Tacoma, and was a co-founder of Columbia Bank.

Directions and parking information are available at www.tacoma.washington.edu/conference.

About Columbia

Headquartered in Tacoma, Washington, Columbia Banking System, Inc. is the holding company of Columbia Bank, a Washington state-chartered full-service commercial bank which was awarded third place in the large employer category bySeattle Business Magazine’s 100 Best Companies to Work For 2010 and was designated one of Puget Sound Business Journal’s “Washington’s Best Workplaces 2010”.

With the January, 2010 FDIC-assisted acquisitions of Columbia River Bank and American Marine Bank, Columbia Banking System has 84 banking offices, including 59 branches in Washington State and 25 branches in Oregon. Columbia Bank does business under the Bank of Astoria name at the Bank of Astoria’s former branches located in Astoria, Warrenton, Seaside, Cannon Beach, Manzanita and Tillamook. More information about Columbia can be found on its website atwww.columbiabank.com.

Source: Columbia Banking System, Inc.

# # #

Note Regarding Forward-Looking Statements

This news release includes forward looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, which management believes are a benefit to shareholders. These forward looking statements describe Columbia’s management’s expectations regarding future events and developments such as future operating results, growth in loans and deposits, continued success of Columbia’s style of banking and the strength of the local economy. The words “will,” “believe,” “expect,” “intend,” “should,” and “anticipate” and words of similar construction are intended in part to help identify forward looking statements. Future events are difficult to predict, and the expectations described above are necessarily subject to risk and uncertainty that may cause actual results to differ materially and adversely. In addition to discussions about risks and uncertainties set forth from time to time in Columbia’s filings with the Securities and Exchange Commission, available at the SEC’s website atwww.sec.gov and the Company’s website at www.columbiabank.com, including the “Risk Factors,” “Business” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of our annual reports on Form 10-K and quarterly reports on Form 10-Q,

factors that may cause actual results to differ materially from those contemplated by such forward-looking statements include, among others, the following: (1) local, national and international economic conditions may be less favorable than expected or have a more direct and pronounced effect on Columbia than expected and adversely affect Columbia’s ability to continue its internal growth at historical rates and maintain the quality of its earning assets; (2) changes in interest rates may reduce interest margins more than expected and negatively affect funding sources; (3) projected business increases following strategic expansion or opening or acquiring new branches may be lower than expected; (4) costs or difficulties related to the integration of acquisitions may be greater than expected; (5) competitive pressure among financial institutions may increase significantly; and (6) legislation or regulatory requirements or changes may adversely affect the businesses in which Columbia is engaged. We believe the expectations reflected in our forward-looking statements are reasonable, based on information available to us on the date hereof. However, given the described uncertainties and risks, we cannot guarantee our future performance or results of operations and you should not place undue reliance on these forward-looking statements. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. The factors noted above and the risks and uncertainties described in our SEC filings should be considered when reading any forward-looking statements in this release.

FINANCIAL STATISTICS

Columbia Banking System, Inc.

Unaudited	Three Months Ended December 31,						Year Ended December 31,
(in thousands except per share)	2010			2009			2010			2009
Earnings
Net interest income	$	38,816		$	29,800		$	164,787		$	115,352
Provision for loan and lease losses, excluding covered loans	$	3,791		$	15,000		$	41,291		$	63,500
Noninterest income	$	15,888		$	8,526		$	52,781		$	29,690
Noninterest expense	$	34,985		$	22,847		$	137,147		$	94,488
Net income (loss)	$	12,608		$	1,552		$	30,784		$	(3,968	)
Net income (loss) applicable to common shareholders	$	12,608		$	447		$	25,837		$	(8,371	)
Per Common Share
Earnings (loss) (basic)	$	0.32		$	0.02		$	0.73		$	(0.38	)
Earnings (loss) (diluted)	$	0.32		$	0.02		$	0.72		$	(0.38	)
Averages
Total assets	$	4,354,890		$	3,177,098		$	4,248,590		$	3,084,421
Interest-earning assets	$	3,682,951		$	2,872,842		$	3,583,728		$	2,783,862
Loans	$	2,450,793		$	2,034,903		$	2,485,650		$	2,124,574
Securities	$	726,470		$	643,716		$	720,152		$	584,028
Deposits	$	3,343,920		$	2,453,553		$	3,270,923		$	2,378,176
Core deposits	$	2,992,417		$	2,039,533		$	2,828,246		$	1,945,039
Interest-bearing deposits	$	2,458,466		$	1,890,479		$	2,452,602		$	1,866,917
Interest-bearing liabilities	$	2,627,804		$	2,041,761		$	2,626,044		$	2,067,014
Noninterest-bearing deposits	$	885,454		$	563,074		$	818,321		$	511,259
Shareholders’ equity	$	707,319		$	530,804		$	668,469		$	462,167
Financial Ratios
Return on average assets		1.15	%		0.19	%		0.72	%		-0.13	%
Return on average common equity		7.07	%		0.39	%		4.15	%		-2.16	%
Average equity to average assets		16.24	%		16.71	%		15.73	%		14.98	%
Net interest margin		4.35	%		4.30	%		4.76	%		4.33	%
Efficiency ratio (tax equivalent)(1)		65.33	%		58.12	%		67.56	%		61.53	%
	December 31,
	2010			2009
Period end
Total assets	$	4,256,363		$	3,200,930
Covered assets, net	$	531,504		$	—
Loans, excluding covered loans	$	1,915,754		$	2,008,884
Allowance for loan and lease losses	$	60,993		$	53,478
Securities	$	781,774		$	631,645
Deposits	$	3,327,269		$	2,482,705
Core deposits	$	2,998,482		$	2,072,821
Shareholders’ equity	$	706,878		$	528,139
Book value per common share	$	17.97		$	16.13
Nonperforming assets, excluding covered assets
Nonaccrual loans	$	89,163		$	110,431
Restructured loans accruing interest		6,505			60
Other real estate owned and other personal property owned		30,991			19,037
Total nonperforming assets, excluding covered assets	$	126,659		$	129,528
Nonperforming loans to period-end loans, excluding covered loans		4.99	%		5.50	%
Nonperforming assets to period-end assets, excluding covered assets		3.40	%		4.05	%
Allowance for loan and lease losses to period-end loans, excluding covered loans		3.18	%		2.66	%
Allowance for loan and lease losses to nonperforming loans, excluding covered loans		63.75	%		48.40	%
Allowance for loan and lease losses to nonperforming assets, excluding covered assets		48.16	%		41.29	%
Net loan charge-offs	$	33,776	(2)	$	52,769	(3)

(1) Noninterest expense, excluding net cost of operation of other real estate divided by the sum of net interest income and noninterest income on a tax equivalent basis, excluding gain/loss on sale of investment securities, proceeds from redemption of Visa and Mastercard shares, gain on bank acquisition, incremental interest income accretion on the acquired loan portfolio and the change in FDIC indemnification asset.

(2) For the twelve months ended December 31, 2010.

(3) For the twelve months ended December 31, 2009.

FINANCIAL STATISTICS

Columbia Banking System, Inc.

Unaudited	December 31,
(in thousands)	2010					2009
Loan Portfolio Composition
Loans not covered under FDIC loss share agreements:
Commercial business	$	795,369		41.5	%	$	744,440		37.1	%
Real Estate:
One-to-four family residential		49,383		2.6	%		63,364		3.2	%
Five or more family residential and commercial		794,329		41.5	%		856,260		42.6	%
Total Real Estate		843,712		44.1	%		919,624		45.8	%
Real Estate Construction:
One-to-four family residential		67,961		3.5	%		107,620		5.3	%
Five or more family residential and commercial		30,185		1.6	%		41,829		2.1	%
Total Real Estate Construction		98,146		5.1	%		149,449		7.4	%
Consumer		182,017		9.5	%		199,987		9.9	%
Subtotal loans		1,919,244		100.2	%		2,013,500		100.2	%
Less: Deferred loan fees		(3,490	)	-0.2	%		(4,616	)	-0.2	%
Total loans not covered under FDIC loss share agreements, net of deferred fees		1,915,754		100.0	%		2,008,884		100.0	%
Loans covered under FDIC loss share agreements:
Covered loans		517,061					—
Total loans, net	$	2,432,815				$	2,008,884
Loans held for sale	$	754				$	—
	December 31,
	2010					2009
Deposit Composition
Core deposits:
Demand and other non-interest bearing	$	895,671		26.9	%	$	574,687		23.1	%
Interest bearing demand		672,307		20.2	%		499,922		20.1	%
Money market		920,831		27.7	%		604,229		24.3	%
Savings		210,995		6.3	%		139,406		5.6	%
Certificates of deposit less than $100,000		298,678		9.0	%		254,577		10.3	%
Total core deposits		2,998,482		90.1	%		2,072,821		83.4	%
Certificates of deposit greater than $100,000		266,708		8.0	%		259,794		10.5	%
Wholesale certificates of deposit (CDARS®)		38,312		1.2	%		96,314		3.9	%
Wholesale certificates of deposit		23,155		0.7	%		53,776		2.2	%
Subtotal		3,326,657		100.0	%		2,482,705		100.0	%
Premium resulting from acquisition date fair value adjustment		612					—
Total Deposits	$	3,327,269				$	2,482,705

QUARTERLY FINANCIAL STATISTICS

Columbia Banking System, Inc.

	Three Months Ended
Unaudited	Dec 31			Sep 30			Jun 30			Mar 31			Dec 31
(in thousands except per share)	2010			2010			2010			2010			2009
Earnings
Net interest income	$	38,816		$	46,965		$	40,732		$	38,274		$	29,800
Provision for loan and lease losses, excluding covered loans	$	3,791		$	9,000		$	13,500		$	15,000		$	15,000
Noninterest income	$	15,888		$	5,183		$	13,237		$	18,473		$	8,526
Noninterest expense	$	34,985		$	33,520		$	34,745		$	33,897		$	22,847
Net income	$	12,608		$	5,204		$	5,056		$	7,916		$	1,552
Net income applicable to common shareholders	$	12,608		$	2,474		$	3,946		$	6,809		$	447
Per Common Share
Earnings (basic)	$	0.32		$	0.06		$	0.11		$	0.24		$	0.02
Earnings (diluted)	$	0.32		$	0.06		$	0.11		$	0.24		$	0.02
Book value	$	17.97		$	17.92		$	17.83		$	16.44		$	16.13
Averages
Total assets	$	4,354,890		$	4,360,913		$	4,327,894		$	3,945,042		$	3,177,098
Interest-earning assets	$	3,682,951		$	3,654,932		$	3,624,548		$	3,368,241		$	2,872,842
Loans, including covered loans	$	2,450,793		$	2,500,302		$	2,550,813		$	2,440,415		$	2,034,903
Securities	$	726,470		$	715,201		$	728,169		$	710,648		$	643,716
Deposits	$	3,343,920		$	3,297,583		$	3,303,661		$	3,135,949		$	2,453,553
Core deposits	$	2,992,417		$	2,887,044		$	2,820,378		$	2,608,279		$	2,039,533
Interest-bearing deposits	$	2,458,466		$	2,467,763		$	2,487,757		$	2,395,562		$	1,890,479
Interest-bearing liabilities	$	2,627,804		$	2,640,738		$	2,663,584		$	2,571,588		$	2,041,761
Noninterest-bearing deposits	$	885,454		$	829,820		$	815,904		$	740,387		$	563,074
Shareholders’ equity	$	707,319		$	739,155		$	684,929		$	539,856		$	530,804
Financial Ratios
Return on average assets		1.15	%		0.47	%		0.47	%		0.81	%		0.19	%
Return on average common equity		7.07	%		1.39	%		2.59	%		5.93	%		0.39	%
Average equity to average assets		16.24	%		16.95	%		15.83	%		13.68	%		16.71	%
Net interest margin		4.35	%		5.24	%		4.66	%		4.78	%		4.30	%
Efficiency ratio (tax equivalent)		65.33	%		68.33	%		68.15	%		67.03	%		58.12	%
Period end
Total assets	$	4,256,363		$	4,245,260		$	4,289,115		$	4,133,812		$	3,200,930
Covered assets, net	$	531,504		$	577,817		$	599,306		$	634,443		$	—
Loans, excluding covered loans	$	1,915,754		$	1,934,162		$	1,945,972		$	1,949,609		$	2,008,884
Allowance for loan and lease losses	$	60,993		$	62,334		$	59,748		$	56,981		$	53,478
Securities	$	781,774		$	710,649		$	727,825		$	736,939		$	631,645
Deposits	$	3,327,269		$	3,306,886		$	3,284,947		$	3,371,165		$	2,482,705
Core deposits	$	2,998,482		$	2,934,451		$	2,831,319		$	2,856,186		$	2,072,821
Shareholders’ equity	$	706,878		$	704,692		$	775,295		$	538,721		$	528,139
Nonperforming assets, excluding covered assets
Nonaccrual loans	$	89,163		$	91,406		$	108,409		$	105,565		$	110,431
Restructured loans accruing interest		6,505			6,482			687			287			60
Other real estate owned and other personal property owned		30,991			23,259			22,814			20,726			19,037
Total nonperforming assets, excluding covered assets	$	126,659		$	121,147		$	131,910		$	126,578		$	129,528
Nonperforming loans to period-end loans, excluding covered loans		4.99	%		5.06	%		5.61	%		5.43	%		5.50	%
Nonperforming assets to period-end assets, excluding covered assets		3.40	%		3.30	%		3.57	%		3.62	%		4.05	%
Allowance for loan and lease losses to period-end loans, excluding covered loans		3.18	%		3.22	%		3.07	%		2.92	%		2.66	%
Allowance for loan and lease losses to nonperforming loans, excluding covered loans		63.75	%		63.68	%		54.77	%		53.83	%		48.40	%
Allowance for loan and lease losses to nonperforming assets, excluding covered assets		48.16	%		51.45	%		45.29	%		45.02	%		41.29	%
Net loan charge-offs	$	5,132		$	6,414		$	10,733		$	11,497		$	13,210

CONSOLIDATED CONDENSED STATEMENTS OF INCOME

Columbia Banking System, Inc.

	Three Months Ended						Year Ended
(Unaudited)	December 31,						December 31,
(in thousands except per share)	2010			2009			2010		2009
Interest Income
Loans	$	36,523		$	28,860		$	157,292	$	117,062
Taxable securities		4,163			4,570			18,276		17,300
Tax-exempt securities		2,360			2,200			9,348		8,458
Federal funds sold and deposits in banks		323			146			963		215
Total interest income		43,369			35,776			185,879		143,035
Interest Expense
Deposits		3,451			4,953			16,733		23,250
Federal Home Loan Bank and Federal Reserve Bank borrowings		710			643			2,841		2,759
Long-term obligations		260			260			1,029		1,197
Other borrowings		132			120			489		477
Total interest expense		4,553			5,976			21,092		27,683
Net Interest Income		38,816			29,800			164,787		115,352
Provision for loan and lease losses, excluding covered loans		3,791			15,000			41,291		63,500
Provision for losses on covered loans		5,602			—			6,055		—
Net interest income after provision		29,423			14,800			117,441		51,852
Noninterest Income
Gain on bank acquisition		—			—			9,818		—
Service charges and other fees		6,314			4,199			24,698		15,181
Merchant services fees		1,797			1,714			7,502		7,321
Redemption of Visa and Mastercard shares		—			—			—		49
Gain on sale of investment securities, net		—			1,077			58		1,077
Bank owned life insurance		500			491			2,041		2,023
Change in indemnification asset		6,045			—			4,908		—
Other		1,232			1,045			3,756		4,039
Total noninterest income		15,888			8,526			52,781		29,690
Noninterest Expense
Compensation and employee benefits		17,723			11,258			69,780		47,275
Occupancy		4,260			3,123			16,814		12,128
Merchant processing		925			860			4,364		3,449
Advertising and promotion		828			268			3,081		1,943
Data processing and communications		1,846			1,073			8,769		4,047
Legal and professional fees		1,100			1,092			5,684		3,871
Taxes, licenses and fees		803			503			2,858		2,478
Regulatory premiums		1,575			1,058			6,485		5,777
Net cost of operation of other real estate		1,589			271			787		861
Amortization of intangibles		1,036			249			3,922		1,046
Other		3,300			3,092			14,603		11,613
Total noninterest expense		34,985			22,847			137,147		94,488
Income (loss) before income taxes		10,326			479			33,075		(12,946	)
Income tax provision (benefit)		(2,282	)		(1,073	)		2,291		(8,978	)
Net Income (Loss)	$	12,608		$	1,552		$	30,784	$	(3,968	)
Net Income (Loss) Applicable to Common Shareholders	$	12,608		$	447		$	25,837	$	(8,371	)
Earnings (loss) per common share
Basic	$	0.32		$	0.02		$	0.73	$	(0.38	)
Diluted	$	0.32		$	0.02		$	0.72	$	(0.38	)
Dividends paid per common share	$	0.01		$	0.01		$	0.04	$	0.07
Weighted average number of common shares outstanding		38,981			27,841			35,209		21,854
Weighted average number of diluted common shares outstanding		39,109			27,924			35,392		21,854

CONSOLIDATED CONDENSED BALANCE SHEETS

Columbia Banking System, Inc.

(Unaudited)					December 31,		December 31,
(in thousands)					2010		2009
ASSETS
Cash and due from banks					$	55,492	$	55,802
Interest-earning deposits with banks						458,638		249,272
Total cash and cash equivalents						514,130		305,074
Securities available for sale at fair value (amortized cost of $743,928 and $602,675, respectively)						763,866		620,038
Federal Home Loan Bank stock at cost						17,908		11,607
Loans held for sale						754		—
Loans, excluding covered loans, net of deferred loan fees of ($3,490) and ($4,616), respectively						1,915,754		2,008,884
Less: allowance for loan and lease losses						60,993		53,478
Loans, excluding covered loans, net						1,854,761		1,955,406
Covered loans, net of allowance for loan losses						517,061		—
Total loans, net						2,371,822		1,955,406
FDIC indemnification asset						170,705		—
Interest receivable						11,164		10,335
Premises and equipment, net						93,108		62,670
Other real estate owned, covered under FDIC loss sharing agreements						14,443		—
Other real estate owned						30,991		19,037
Total other real estate owned						45,434		19,037
Goodwill						109,639		95,519
Core deposit intangible, net						18,696		4,863
Other assets						139,137		116,381
Total Assets					$	4,256,363	$	3,200,930
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposits:
Noninterest-bearing					$	895,671	$	574,687
Interest-bearing						2,431,598		1,908,018
Total deposits						3,327,269		2,482,705
Federal Home Loan Bank advances						119,405		100,000
Securities sold under agreements to repurchase						25,000	��	25,000
Other borrowings						642		86
Long-term subordinated debt						25,735		25,669
Other liabilities						51,434		39,331
Total liabilities						3,549,485		2,672,791
Commitments and contingent liabilities
	December 31, 2010		December 31, 2009
Preferred stock (no par value, 76,898 aggregate liquidation preference)
Authorized shares		2,000		2,000
Issued and outstanding		—		77		—		74,301
Common Stock (no par value)
Authorized shares		63,033		63,033
Issued and outstanding		39,338		28,129		576,905		348,706
Retained earnings						117,692		93,316
Accumulated other comprehensive income						12,281		11,816
Total shareholders’ equity						706,878		528,139
Total Liabilities and Shareholders’ Equity					$	4,256,363	$	3,200,930