<SEC-DOCUMENT>0001193125-14-348720-index.html : 20140922
<SEC-HEADER>0001193125-14-348720.hdr.sgml : 20140922
<ACCEPTANCE-DATETIME>20140922170759
ACCESSION NUMBER:		0001193125-14-348720
CONFORMED SUBMISSION TYPE:	S-4/A
PUBLIC DOCUMENT COUNT:		9
FILED AS OF DATE:		20140922
DATE AS OF CHANGE:		20140922

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:		S-4/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-198356
		FILM NUMBER:		141114536

	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>S-4/A
<SEQUENCE>1
<FILENAME>d764502ds4a.htm
<DESCRIPTION>FORM S-4/A
<TEXT>
Document 1 - file: d764502ds4a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d764502dex51.htm
<DESCRIPTION>OPINION OF GRAHAM & DUNN PC
<TEXT>
Document 2 - file: d764502dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.3
<SEQUENCE>3
<FILENAME>d764502dex233.htm
<DESCRIPTION>CONSENT OF DELOITTE & TOUCHE LLP
<TEXT>
Document 3 - file: d764502dex233.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.4
<SEQUENCE>4
<FILENAME>d764502dex234.htm
<DESCRIPTION>CONSENT OF BDO USA, LLP
<TEXT>
Document 4 - file: d764502dex234.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24.2
<SEQUENCE>5
<FILENAME>d764502dex242.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
Document 5 - file: d764502dex242.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>6
<FILENAME>d764502dex991.htm
<DESCRIPTION>FORM OF PROXY
<TEXT>
Document 6 - file: d764502dex991.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.2
<SEQUENCE>7
<FILENAME>d764502dex992.htm
<DESCRIPTION>FORM OF ELECTION STATEMENT
<TEXT>
Document 7 - file: d764502dex992.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g764502img001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g764502img001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g764502img002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g764502img002.jpg

</DOCUMENT>
</SEC-DOCUMENT>