<SEC-DOCUMENT>0000860413-17-000021-index.html : 20170623
<SEC-HEADER>0000860413-17-000021.hdr.sgml : 20170623
<ACCEPTANCE-DATETIME>20170623144139
ACCESSION NUMBER:		0000860413-17-000021
CONFORMED SUBMISSION TYPE:	POS AM
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20170623
DATE AS OF CHANGE:		20170623

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:		POS AM
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-215749
		FILM NUMBER:		17927259

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

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
		DATE OF NAME CHANGE:	19930615
</SEC-HEADER>
<DOCUMENT>
<TYPE>POS AM
<SEQUENCE>1
<FILENAME>s4amendment26222017.htm
<DESCRIPTION>S-4 POS AM
<TEXT>
Document 1 - file: s4amendment26222017.htm

</DOCUMENT>
</SEC-DOCUMENT>