<SEC-DOCUMENT>0001193125-15-279329-index.html : 20150806
<SEC-HEADER>0001193125-15-279329.hdr.sgml : 20150806
<ACCEPTANCE-DATETIME>20150805204309
ACCESSION NUMBER:		0001193125-15-279329
CONFORMED SUBMISSION TYPE:	S-3ASR
PUBLIC DOCUMENT COUNT:		8
FILED AS OF DATE:		20150806
DATE AS OF CHANGE:		20150805
EFFECTIVENESS DATE:		20150806

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-3ASR
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-206125
		FILM NUMBER:		151030741

	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-3ASR
<SEQUENCE>1
<FILENAME>d38850ds3asr.htm
<DESCRIPTION>3ASR
<TEXT>
Document 1 - file: d38850ds3asr.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.4
<SEQUENCE>2
<FILENAME>d38850dex44.htm
<DESCRIPTION>EX-4.4
<TEXT>
Document 2 - file: d38850dex44.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.10
<SEQUENCE>3
<FILENAME>d38850dex410.htm
<DESCRIPTION>EX-4.10
<TEXT>
Document 3 - file: d38850dex410.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.11
<SEQUENCE>4
<FILENAME>d38850dex411.htm
<DESCRIPTION>EX-4.11
<TEXT>
Document 4 - file: d38850dex411.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>5
<FILENAME>d38850dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 5 - file: d38850dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.2
<SEQUENCE>6
<FILENAME>d38850dex52.htm
<DESCRIPTION>EX-5.2
<TEXT>
Document 6 - file: d38850dex52.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-12.1
<SEQUENCE>7
<FILENAME>d38850dex121.htm
<DESCRIPTION>EX-12.1
<TEXT>
Document 7 - file: d38850dex121.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.3
<SEQUENCE>8
<FILENAME>d38850dex233.htm
<DESCRIPTION>EX-23.3
<TEXT>
Document 8 - file: d38850dex233.htm

</DOCUMENT>
</SEC-DOCUMENT>