<SEC-DOCUMENT>0001193125-19-010659-index.html : 20190116
<SEC-HEADER>0001193125-19-010659.hdr.sgml : 20190116
<ACCEPTANCE-DATETIME>20190116165933
ACCESSION NUMBER:		0001193125-19-010659
CONFORMED SUBMISSION TYPE:	S-4/A
PUBLIC DOCUMENT COUNT:		9
FILED AS OF DATE:		20190116
DATE AS OF CHANGE:		20190116

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:		S-4/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-228575
		FILM NUMBER:		19529510

	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>
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Document 1 - file: d658179ds4a.htm

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<DESCRIPTION>EX-8.1
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Document 2 - file: d658179dex81.htm

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<TYPE>EX-8.2
<SEQUENCE>3
<FILENAME>d658179dex82.htm
<DESCRIPTION>EX-8.2
<TEXT>
Document 3 - file: d658179dex82.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>4
<FILENAME>d658179dex231.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 4 - file: d658179dex231.htm

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<DOCUMENT>
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<FILENAME>d658179dex992.htm
<DESCRIPTION>EX-99.2
<TEXT>
Document 5 - file: d658179dex992.htm

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Document 6 - file: g658179g33b88.jpg

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<DESCRIPTION>GRAPHIC
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Document 7 - file: g658179g37w24.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g658179g61h79.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g658179g61h79.jpg

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<DOCUMENT>
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Document 9 - file: g658179g79w60.jpg

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