<SEC-DOCUMENT>0001193125-21-238938-index.html : 20210806
<SEC-HEADER>0001193125-21-238938.hdr.sgml : 20210806
<ACCEPTANCE-DATETIME>20210806120635
ACCESSION NUMBER:		0001193125-21-238938
CONFORMED SUBMISSION TYPE:	S-4
PUBLIC DOCUMENT COUNT:		9
FILED AS OF DATE:		20210806
DATE AS OF CHANGE:		20210806

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
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-258551
		FILM NUMBER:		211151785

	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

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COLUMBIA BANKING SYSTEM INC
		DATE OF NAME CHANGE:	19930328
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-4
<SEQUENCE>1
<FILENAME>d190993ds4.htm
<DESCRIPTION>S-4
<TEXT>
Document 1 - file: d190993ds4.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d190993dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: d190993dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.3
<SEQUENCE>3
<FILENAME>d190993dex233.htm
<DESCRIPTION>EX-23.3
<TEXT>
Document 3 - file: d190993dex233.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.4
<SEQUENCE>4
<FILENAME>d190993dex234.htm
<DESCRIPTION>EX-23.4
<TEXT>
Document 4 - file: d190993dex234.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.2
<SEQUENCE>5
<FILENAME>d190993dex992.htm
<DESCRIPTION>EX-99.2
<TEXT>
Document 5 - file: d190993dex992.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.3
<SEQUENCE>6
<FILENAME>d190993dex993.htm
<DESCRIPTION>EX-99.3
<TEXT>
Document 6 - file: d190993dex993.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g190993g39g99.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g190993g39g99.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g190993jg1.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g190993jg1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g190993jg2.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g190993jg2.jpg

</DOCUMENT>
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