COLUMBIA BANKING SYSTEM, INC. — Earnings Release 2011

Apr 28, 2011

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):

4/27/11

COLUMBIA BANKING SYSTEM, INC.

(Exact name of registrant as specified in its charter)

Washington	0-20288	91-1422237
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)
1301 A Street
Tacoma, WA	98402
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (253) 305-1900

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition

On April 27, 2011, Columbia Banking System, Inc. issued a press release reporting its financial results for the quarter ended March 31, 2011. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. This information is being furnished under Item 2.02 (Results of Operations and Financial Condition) of Form 8-K.

Item 8.01 Other Events

On April 27, 2011, Columbia Banking System, Inc. issued a press release announcing a quarterly cash dividend of $0.05 per common share. The dividend will be paid on May 25, 2011, to shareholders of record at the close of business on May 11, 2011. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits

(d) The following exhibits are being furnished herewith:

99.1 Press Release dated April 27, 2011 announcing first quarter ended March 31, 2011 financial results.

SIGNATURES

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

	COLUMBIA BANKING SYSTEM, INC.
Date: April 28, 2011	/s/ Melanie J. Dressel
	Melanie J. Dressel
	President and Chief Executive Officer

EXHIBIT INDEX

99.1 Press release dated April 27, 2011.