<SEC-DOCUMENT>0000860413-18-000042-index.html : 20180316
<SEC-HEADER>0000860413-18-000042.hdr.sgml : 20180316
<ACCEPTANCE-DATETIME>20180316144009
ACCESSION NUMBER:		0000860413-18-000042
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		6
CONFORMED PERIOD OF REPORT:	20180502
FILED AS OF DATE:		20180316
DATE AS OF CHANGE:		20180316
EFFECTIVENESS DATE:		20180316

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIRST INTERSTATE BANCSYSTEM INC
		CENTRAL INDEX KEY:			0000860413
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				810331430
		STATE OF INCORPORATION:			MT
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34653
		FILM NUMBER:		18695309

	BUSINESS ADDRESS:	
		STREET 1:		P O BOX 30918
		STREET 2:		401 NO 31ST STREET
		CITY:			BILLINGS
		STATE:			MT
		ZIP:			59116-0918
		BUSINESS PHONE:		4062555300

	MAIL ADDRESS:	
		STREET 1:		P O BOX 30918
		STREET 2:		401 NO 31ST STREET
		CITY:			BILLINGS
		STATE:			MT
		ZIP:			59116-0918

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
		DATE OF NAME CHANGE:	19930615
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>a2017proxy.htm
<DESCRIPTION>DEF 14A
<TEXT>
Document 1 - file: a2017proxy.htm

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<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>pxi40019001.jpg
<TEXT>
Document 2 - file: pxi40019001.jpg

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<SEQUENCE>3
<FILENAME>text01.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: text01.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>text02.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: text02.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>text03.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: text03.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>texta01.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: texta01.jpg

</DOCUMENT>
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