<SEC-DOCUMENT>0000887343-17-000155-index.html : 20171027
<SEC-HEADER>0000887343-17-000155.hdr.sgml : 20171027
<ACCEPTANCE-DATETIME>20171026183601
ACCESSION NUMBER:		0000887343-17-000155
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20171026
ITEM INFORMATION:		Results of Operations and Financial Condition
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20171027
DATE AS OF CHANGE:		20171026

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COLUMBIA BANKING SYSTEM INC
		CENTRAL INDEX KEY:			0000887343
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				911422237
		STATE OF INCORPORATION:			WA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20288
		FILM NUMBER:		171157532

	BUSINESS ADDRESS:	
		STREET 1:		1301 A STREET
		CITY:			TACOMA
		STATE:			WA
		ZIP:			98402
		BUSINESS PHONE:		2533051900

	MAIL ADDRESS:	
		STREET 1:		1301 A STREET
		CITY:			TACOMA
		STATE:			WA
		ZIP:			98402
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>colb3q2017form8-k.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: colb3q2017form8-k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>a991colb3q2017earningsrele.htm
<DESCRIPTION>PRESS RELEASE - EARNINGS
<TEXT>
Document 2 - file: a991colb3q2017earningsrele.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>cbsystemsolidbuga02.jpg
<DESCRIPTION>LOGO
<TEXT>
Document 3 - file: cbsystemsolidbuga02.jpg

</DOCUMENT>
</SEC-DOCUMENT>